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  • Other Sources  (390)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (171)
  • ACOUSTICS  (158)
  • Inorganic Chemistry
  • Seismology
  • 1980-1984  (390)
  • 1955-1959
  • 1950-1954
  • 1981  (390)
Collection
Source
Keywords
Publisher
Years
  • 1980-1984  (390)
  • 1955-1959
  • 1950-1954
Year
  • 1
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    Regional relationships among earthquake magnitude scales (1981)
    In:  Rev. Geophys. Space Phys., Taipei, Elsevier, vol. 19, no. B2, pp. 649-663, pp. B02317, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Scaling ; Magnitude ; Nuclear explosion
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Three-dimensional spontaneous rupture propagation and implications for the earthquake source mechanism (1981)
    In:  Geophys. J. R. astr. Soc., Warszawa, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 67, no. 36, pp. 375-393, pp. B05310, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1981
    Keywords: Source ; Seismology ; Fracture ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Theory of time-dependent rupture in the earth (1981)
    In:  J. Geophys. Res., Warszawa, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 86, no. 36, pp. 6039-6051, pp. B05310, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1981
    Keywords: Friction ; Fracture ; Rock mechanics ; Seismology ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Preliminary reference earth model (1981)
    In:  Phys. Earth Planet. Inter., Luxembourg, U.S. Geological Survey, vol. 25, no. 24, pp. 297-356, pp. B05309, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Earth model, also for more shallow analyses ! ; PREM ; PEPI ; Dziewonski
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Contributions to the knowledge of the geometrical and physical parameters of the Vrancea earthquake foci (1981)
    In:  Rev. Roum. Géol., Géophys. et Géogr. - Géophysique, Münster, 3, vol. 25, no. 3-4, pp. 17-34, pp. L12311, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1981
    Keywords: Earthquake ; Seismology ; EUROPROBE (Geol. and Geophys. in eastern Europe) ; Fault plane solution, focal mechanism
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    The character of high-frequency strong ground motion (1981)
    In:  Bull. Seism. Soc. Am., Luxembourg, Conseil de l'Europe, vol. 71, no. 7055, pp. 2071-2095, pp. B05S07, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Strong motions ; Spectrum ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    Hybrid ray-mode formulation of SH motion in a two-layer half-space (1981)
    In:  Bull. seism. Soc. Am., Helsinki, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 71, no. 2, pp. 1763-1781, pp. 2265, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1981
    Keywords: SH waves ; Layers ; Seismology ; NOModelling ; Synthetic seismograms ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    Monitoring an underground repository with modern seismological methods (1981)
    In:  Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., San Francisco, Pergamon, vol. 18, no. 8, pp. 517-527, pp. 1121, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Energy (of earthquakes) ; nuclear ; waste ; disposal
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    BIBLIOGRAPHY SEISMOLOGY
  • 9
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    Analysis of peak ground motion in terms of a model of inhomogeneous faulting (1981)
    In:  J. Geophys. Res., New York, August, vol. 86, no. 3-4, pp. 3901-3912, pp. 1610, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Strong motions ; Seismology ; Inhomogeneity ; Fracture ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 10
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    Mantle P-wave velocity structure beneath Antarctica (1981)
    In:  Bull. Seism. Soc. Am., New York, August, vol. 71, no. 3-4, pp. 1061-1074, pp. B05S05, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: earth mantle ; Seismology ; P-waves ; residues ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 11
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    Peak horizontal accelerations and velocity from strong-motion records including records from the 1979 Imperial Valley, California, earthquake (1981)
    In:  Bull. Seism. Soc. Am., (submitted), Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 71, no. 1-2, pp. 2011-2038, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Strong motions ; Earthquake ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 12
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    Three-dimensional expression of seismic particle motions by the trajectory ellipsoid and its application to the seismic data observed in the Kanto district, Japan (1981)
    In:  J. Phys. Earth, Bonn, 3-4, vol. 29, no. 1, pp. 221-239, pp. B01401, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Description: Ellipsoid-Least-Squares-Fit
    Keywords: Seismology ; Polarization ; Three component data ; JPE
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    BIBLIOGRAPHY SEISMOLOGY
  • 13
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    Length of rupture from the Swabian Alb event on 3. September 1978. Derived from the Pn duration at GRF (1981)
    In:  Geol. Jb., Würzburg, Physica-Verlag, vol. E21, no. 1, pp. 13-25, pp. L24313, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: P-waves ; Fracture ; Fracture time (duration) ; Earthquake ; Seismology ; Seismic arrays
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    BIBLIOGRAPHY SEISMOLOGY
  • 14
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    Source inversion of seismic waveforms: The Koyna, India, earthquakes of 13 September 1967 (1981)
    In:  Bull. Seism. Soc. Am., Basel, Elsevier Science Publishers, vol. 71, no. 8, pp. 1-24, pp. L15S20, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Earthquake ; Inversion ; Source parameters ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 15
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    A stochastic fault model. 2. Time-dependent case (1981)
    In:  J. Geophys. Res., Luxembourg, EGS-Gauthier-Villars, vol. 86, no. 1-4, pp. 10821-10834, pp. L23608
    Details
    Publication Date: 1981
    Keywords: Seismology ; Source parameters ; Statistical investigations ; Fault zone ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 16
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    Seismogram synthesis using normal mode superposition: The locked mode approximation (1981)
    In:  Geophys. J. R. astr. Soc., Münster, 3, vol. 66, no. 2, pp. 37-69, pp. L23301, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1981
    Keywords: NOModelling ; Layers ; Seismology ; Synthetic seismograms ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 17
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    Depth resolution of earthquakes in central Asia by moment tensor inversion of long-period Rayleigh waves: Effects of phase velocity variations across Eurasia and their calibration (1981)
    In:  J. Geophys. Res., Oslo, Wiley, vol. 86, no. 2, pp. 5963-5984, pp. L02304, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Moment tensor ; Inversion ; Seismicity ; Rayleigh waves ; Phase velocity ; Hypocentral depth ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 18
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    Data-adaptive polarization filters for multichannel geophysical data (1981)
    In:  Geophysics, Basel, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 46, no. 3, pp. 1423-1431, pp. 1009, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Seismics (controlled source seismology) ; Filter- ; Polarization
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    BIBLIOGRAPHY SEISMOLOGY
  • 19
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    Characteristic earthquakes on intraplate normal faults (1981)
    In:  Earthquake Notes, Luxembourg, Conseil de l'Europe, vol. 51, no. 3, pp. 71, pp. 1006, (ISSN: 1340-4202)
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    Publication Date: 1981
    Keywords: Seismology ; Earthquake ; Source
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    BIBLIOGRAPHY SEISMOLOGY
  • 20
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    The 1886 Charleston, South Carolina earthquake and the Appalachian detachment (1981)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 86, no. 1-4, pp. 7874-7894, pp. 1006, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Earthquake ; Seismology ; Geol. aspects ; Tectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 21
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    Detection probabilities for earthquakes in Sweden (1981)
    In:  J. Geophys., Luxembourg, Deutsche Geophys. Gesellschaft, vol. 49, no. 2, pp. 243-244, pp. 8045, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismicity ; Seismology ; Detectors ; Kulhanek ; Wahlstroem ; Wahlstrom
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    BIBLIOGRAPHY SEISMOLOGY
  • 22
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    An automatic measurement of arrival time of seismic waves and its application to an on-line processing system (1981)
    In:  Bull. Earthq. Res. Inst., Corvallis, x + 406 pp., Oregon State University Press, vol. 55, no. 1-4, pp. 449-484, pp. L13610, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Travel time ; Data analysis / ~ processing
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    BIBLIOGRAPHY SEISMOLOGY
  • 23
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    Conversion phases from mantle transition zones. Identification of seismic sources - earthquake or underground explosion (1981)
    D. Reidel Publ. Comp.
    In:  London, D. Reidel Publ. Comp., vol. special paper 359, ix + 190 pp., no. 2, pp. 497-504, (ISBN 0-8137-2359-0)
    Details
    Publication Date: 1981
    Keywords: Discrimination ; Seismology ; ConvolutionR ; Source ; Nuclear explosion
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    BIBLIOGRAPHY SEISMOLOGY
  • 24
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    Principles and Applications of Microearthquake Networks (1981)
    Academic Press
    In:  New York, 293 pp., Academic Press, vol. 34, no. 22, pp. 65-70, (ISBN 0-691-12183-4, 2005 (481 pp. + CD-ROM))
    Details
    Publication Date: 1981
    Keywords: Seismic networks ; Handbook of geophysics ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 25
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    Focal mechanism solutions and their tectonic implications for the eastern Alpine-Himalayan region (1981)
    Am. Geophys. Un.
    In:  Professional Paper, Zagros, Hindu Kush, Himalaya: Geodynamic Evolution, Washington, D. C., Am. Geophys. Un., vol. 65, no. 16, pp. 243-271, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publication Date: 1981
    Keywords: Fault plane solution, focal mechanism ; Tectonics ; Plate tectonics ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 26
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    Earthquake magnitude - Recent research and current trends (1981)
    In:  Earth-Sci. Rev., Ottawa, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 17, no. 3-4, pp. 315-398, pp. L14310
    Details
    Publication Date: 1981
    Keywords: Magnitude ; Seismology ; Review article ; Bath
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    BIBLIOGRAPHY SEISMOLOGY
  • 27
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    Crustal structures in China from surface waves (1981)
    In:  Acta Seismologica Sinica, Tokyo, Terra Scientific Publishing Company, vol. 3, no. 1-3, pp. 335-350, pp. B05S09, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1981
    Keywords: Surface waves ; CRUST ; China ; Seismology ; Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 28
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    Focal depths and moment tensor representations of shallow earthquakes associated with the great Sumba earthquake (1981)
    In:  J. Geophys. Res., Tokyo, Terra Scientific Publishing Company, vol. 86, no. 8, pp. 9357-9374, pp. B05S21, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Moment tensor ; Source parameters ; Earthquake ; Hypocentral depth ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 29
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    An automatic seismic signal detection algorithm based on the Walsh transform (1981)
    In:  Bull. Seism. Soc. Am., Bonn, Pergamon, vol. 71, no. 4, pp. 1351-1360, pp. 2050, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Detectors ; sta ; Transformations ; squ ; median ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 30
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    Magnitudes of large shallow earthquakes from 1904 to 1980 (1981)
    In:  Phys. Earth Plan. Int., vol. 27, no. 1-4, pp. 72-92
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    Publication Date: 1981
    Keywords: Magnitude ; Seismology ; Earthquake catalog ; PEPI
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    BIBLIOGRAPHY SEISMOLOGY
  • 31
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    Crustal Q structure in the United States from multi-mode surface waves (1981)
    In:  Bull. seism. Soc. Am., Taipei, Elsevier, vol. 71, no. 2, pp. 161-181, pp. B09401, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1981
    Keywords: Attenuation ; Surface waves ; NOModelling ; CRUST ; Seismology ; Quality factor ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 32
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    Determination of source parameters from seismograms of mining tremors and the inverse problem for a seismic source (1981)
    Polish Academy of Sciences
    In:  Publications of the Institute of Geophysics, Warszawa, Polish Academy of Sciences, vol. A-11(147), no. 18, pp. 16-1 to 16-4, pp. 1869, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Source parameters ; Inversion ; Induced seismicity ; Mining geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 33
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    Determination of earthquake source parameters from waveform data for studies of global and regional seismicity (1981)
    In:  J. Geophys. Res., Luxembourg, U.S. Geological Survey, vol. 86, no. 3-4, pp. 2825-2852, pp. B05309, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1981
    Keywords: Source parameters ; Seismology ; Source ; Seismicity ; Wave form analysis ; JGR ; Dziewonski
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    BIBLIOGRAPHY SEISMOLOGY
  • 34
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    Fundamental spheroidal mode observations of aspherical heterogeneity (1981)
    In:  Geophys. J. R. astr. Soc., Dordrecht, National Academy of Sciences of the USA, vol. 64, no. 5-6, pp. 605-634, pp. TC5003, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: NOModelling ; Inhomogeneity ; Seismology ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 35
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    A broadband study of the 13 August 1978 Santa Barbara earthquake (1981)
    In:  Bull. Seism. Soc. Am., Washington, D.C., AGU, vol. 71, no. B12, pp. 1701-1718, pp. B12406, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Broad-band ; Earthquake ; BSSA
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  • 36
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    Seismic Waves and Sources (1981)
    Springer
    In:  New York, 1108 pp., Springer, vol. 96, pp. 225, (ISBN 0-471-95596-5)
    Details
    Publication Date: 1981
    Keywords: FROTH ; RUB ; GMG ; 3.15.80 ; Textbook of geophysics ; Seismology ; Waves ; Wavelet processing ; SModelling ; Dislocation ; Elasticity theory of dislocations ; Source
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    BIBLIOGRAPHY SEISMOLOGY
  • 37
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    Identification of Seismic Sources - Earthquake or Underground Explosion (1981)
    Reidel
    In:  Amsterdam, Reidel, vol. 65, no. XVI:, pp. 1-14, (ISBN 0-521-80380-2 (hb), 0521-00859-X (pb))
    Details
    Publication Date: 1981
    Keywords: Nuclear explosion ; Seismology ; Discrimination ; Source
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    BIBLIOGRAPHY SEISMOLOGY
  • 38
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    Earthquake Mechanics (1981)
    Cambridge Univ. Press
    In:  Cambridge, XIII+248 pp., Cambridge Univ. Press, vol. 7, no. XVI:, pp. 227-235, (ISBN 0231-12739-1 hb, 0231127383 pb)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Earthquake ; Textbook of geophysics
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  • 39
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    Earthquake Prediction (1981)
    AGU
    In:  Washington, D.C., AGU, vol. 4, no. Publ. No. 12, pp. 9, (3-540-24165-5, XXVI + 228 p.)
    Details
    Publication Date: 1981
    Keywords: Handbook of geophysics ; Earthquake precursor: prediction research ; Earthquake precursor: deformation or strain ; Seismicity ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 40
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    A study of crustal and upper mantle structure of Northwestern Turkey (1981)
    In:  Geophys. Res. Lett., Tokyo, Railway Tech. Res. Inst., vol. 8, no. 12, pp. 33-35, pp. B06403, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Seismics (controlled source seismology) ; CRUST ; earth mantle ; Travel time ; GRL ; Necioglu
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    BIBLIOGRAPHY SEISMOLOGY
  • 41
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    International Symposium on the Analysis of Seismicity and Seismic Hazard and Seismic Risk, 18. - 23. May 1981 (1981)
    Czechoslovak Academy of Sciences
    In:  Proceedings, 1., Prag, Czechoslovak Academy of Sciences, vol. 10, no. WS-693 7-83, pp. 235-239, (ISBN 3-933346-037)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Seismicity ; Earthquake precursor: prediction research ; Earthquake risk ; Earthquake hazard ; Proceedings of a conference
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  • 42
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    A technique for the inversion of regional data in source parameter studies (1981)
    In:  J. Geophys. Res., Washington, D.C., AGU, vol. 86, no. B12, pp. 1679-1685, pp. B12406, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Source parameters ; Inversion ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 43
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    Seismic quiescence in the Western Hellenic Arc may foreshadow large earthquakes (1981)
    In:  Nature, Reykjavík, Icelandic Meteorological Office, Ministry for the Environment, University of Iceland, vol. 289, no. 11, pp. 785-787, pp. L05306, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismicity ; Earthquake precursor: statistical anal. of seismicity ; Seismology ; Earthquake precursor: prediction research ; FROTH ; (abstract)
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    BIBLIOGRAPHY SEISMOLOGY
  • 44
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    Seismic discrimination problems at regional distances (1981)
    D. Reidel Publishing Company
    In:  Professional Paper, Identification of Seismic Sources - Earthquake or Underground Explosion, Berlin, D. Reidel Publishing Company, vol. 24, no. 16, pp. 695-740, (ISBN 0080419208)
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    Publication Date: 1981
    Keywords: Seismology ; Nuclear explosion ; Discrimination
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    BIBLIOGRAPHY SEISMOLOGY
  • 45
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    Prediction-oriented seismology (1981)
    Reidel
    In:  Bull., Polar Proj. OP-O3A4, Current Research in Earthquake Prediction, Dordrecht, Reidel, vol. I, no. XVI:, pp. 221-300, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1981
    Keywords: Earthquake precursor: prediction research ; Seismicity ; Seismology ; Earthquake precursor: stresses ; Fault plane solution, focal mechanism
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    BIBLIOGRAPHY SEISMOLOGY
  • 46
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    Broad-band seismometry - a unified approach towards a kinematic and dynamic interpretation of seismograms (1981)
    In:  Bull., Polar Proj. OP-O3A4, Identification of Seismic Sources - Earthquake or Underground Explosion, Leiden, Noordhoff, vol. 11, no. XVI:, pp. 763-786, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Broad-band ; Seismic arrays ; Data analysis / ~ processing ; Nuclear explosion ; Review article
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    BIBLIOGRAPHY SEISMOLOGY
  • 47
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    Phase identification and event location at regional distance using small-aperture array data (1981)
    D. Reidel Publ. Co.
    In:  Bull., Polar Proj. OP-O3A4, Identification of Seismic Sources - Earthquake or Underground Explosion, Moscow, D. Reidel Publ. Co., vol. 65, no. Subvol. a, pp. 467-481, (ISBN 0080419208)
    Details
    Publication Date: 1981
    Keywords: Seismology ; NOR ; PIC ; f-k-Analysis ; Seismic arrays ; NOISE ; AUD ; Location ; Nuclear explosion
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    BIBLIOGRAPHY SEISMOLOGY
  • 48
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    Seismological significance of the 1977-1978 eruptions and magma intrusion process of Usu Volcano, Hokkaido (1981)
    In:  J. Volcanol. Geotherm. Res., Kyoto, AGU, vol. 9, no. 6, pp. 311-344, pp. L24617, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Earthquake ; Source
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  • 49
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    Richtantenne für Erdbebenwellen (1981)
    In:  Umschau, New York, Scientific American, vol. 81, no. B9, pp. 443, pp. B09309, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismic arrays ; Seismology
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  • 50
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    Results of recent South Carolina seismological studies (1981)
    In:  Bull. Seism. Soc. Am., Kunming, China, AGU, vol. 71, no. 5636, pp. 1883-1902, pp. L14317, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Review article ; Seismicity ; Source parameters ; Seismology ; BSSA
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  • 51
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    Earthquake Interpretations. A Manual For Reading Seismograms (1981)
    William Kaufmann, Inc.
    In:  Los Altos, California, William Kaufmann, Inc., vol. Developments in Petroleum Science vol. 15B, no. Publ. No. 12, pp. 9, (3-540-24165-5, XXVI + 228 p.)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Handbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 52
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    International Symposium on the Analysis of Seismicity and Seismic Hazard and Seismic Risk, 18. - 23. May 1981 (1981)
    Czechoslovak Academy of Sciences
    In:  Proceedings, 2., Prag, Czechoslovak Academy of Sciences, vol. 10, no. WS-693 7-83, pp. 235-239, (ISBN 3-933346-037)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Seismicity ; Earthquake precursor: prediction research ; Earthquake risk ; Earthquake hazard ; Proceedings of a conference
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  • 53
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    Untersuchungen zum Bruchvorgang des Rumänischen Erdbebens am 4.3.1977 und Bestimmung des seismischen Moments mit Hilfe von synthetischen Seismogrammen für P-Wellen (1981)
    Geophysikalisches Inst.
    In:  Diplomarbeit, Univ. Karlsruhe, Geophysikalisches Inst., vol. 1034, no. 77-3, pp. 262-277, (ISBN 3-933346-037)
    Details
    Publication Date: 1981
    Keywords: Seismology ; seismic Moment ; Earthquake ; Synthetic seismograms ; Rakers
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  • 54
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    Properties of ambient seismic noise and summary of noise spectrum in the vicinity of RSTN sites (1981)
    Lawrence Livermore National Laboratory
    In:  informal report, Houston, Lawrence Livermore National Laboratory, vol. 339-350, no. UCID-18928, pp. 344, (ISBN 3-933346-037)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Nuclear explosion ; NOISE ; Spectrum ; Geol. aspects ; Seismicity
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  • 55
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    Use of stochastic models in seismology (1981)
    In:  Houston, no. 18, pp. 143-179
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    Publication Date: 1981
    Keywords: Seismology ; Statistical investigations ; Inhomogeneity
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  • 56
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    The anelasticity of the earth's mantle in the European area (1981)
    In:  Tectonophysics, Dordrecht, Martinus Nijhoff Publishers, vol. 72, no. 5705, pp. 181-201, pp. 2389, (ISSN: 1340-4202)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Inelastic ; Attenuation ; Elasticity ; earth mantle
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  • 57
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    The Denver earthquakes of 1967-1968 (1981)
    In:  Bull. Seism. Soc. Am., Zagreb, Conseil de l'Europe, vol. 71, no. 4, pp. 731-745, pp. L02307, (ISSN 0343-5164)
    Details
    Publication Date: 1981
    Keywords: Seismology ; Earthquake ; Earthquake catalog ; BSSA
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  • 58
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    A numerical study of peak ground motion scaling (1981)
    In:  Bull. Seism. Soc. Am., Zagreb, Conseil de l'Europe, vol. 71, no. 4, pp. 1963-1979, pp. L02307, (ISSN 0343-5164)
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    Publication Date: 1981
    Keywords: Seismology ; Strong motions ; BSSA
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  • 59
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    Amplitudenverlauf von seismischen Kernphasen und der Geschwindigkeits- und Dichtesprung an der Grenze des inneren Kern, mit einem Anhang über die Synthese theoretischer Seismogramme mit Hilfe der schnellen Hankeltransformation (1981)
    Universität Karlsruhe
    In:  Dissertation, Grenoble, Universität Karlsruhe, vol. 10, no. GL-TR-89-0230, pp. 95-134, (ISBN 3-933346-037)
    Details
    Publication Date: 1981
    Keywords: Seismology ; PKP ; earth Core ; Earth model, also for more shallow analyses ! ; Velocity depth profile ; Synthetic seismograms ; Transformations ; Hage
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  • 60
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    Regional phase processors (1981)
    VELA Seismological Center
    In:  report, Arlington, Virginia, VELA Seismological Center, vol. 10, no. VSC-TR-81-19, pp. 484-486, (ISBN 3-933346-037)
    Details
    Publication Date: 1981
    Description: Polar. filter (von Smart, 1977) zur Detektion u Bestimmung des Azimuts, Anwendung auf P und Lg-Phasen in kurz-periodischen Daten der Station RKON. unterschiedlich zitiert bei Christ. und ...
    Keywords: Seismology ; Data analysis / ~ processing ; Filter- ; Detectors ; Polarization
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  • 61
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    Informationsreise der seismologischen Delegation aus der Bundesrepublik Deutschland in die Volksrepublik China, 1.-25. März 1981 (1981)
    Inst. of Geophys., Univ. Frankfurt
    In:  Reisebericht an die Max-Planck-Gesellschaft, Bad Bergzabern, Inst. of Geophys., Univ. Frankfurt, vol. 10, no. 13, pp. 1-217
    Details
    Publication Date: 1981
    Keywords: Seismology ; Earthquake precursor: prediction research ; Project report/description
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  • 62
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    EET theoretical design techniques (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: As a part of the EET aerodynamics program an out-of-house program was developed and monitored to provide theoretical procedures useful in the design of transport aircraft. The focus of the effort was to provide tools valid in the nonlinear transonic speed range. The effort was divided into two basic areas, inviscid configuration analysis and design procedures and viscous correction procedures.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Advan. Aerodyn.: Selected NASA Res.; p 79-94
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  • 63
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    F-111 TACT natural laminar flow glove flight results (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Improvements in cruise efficiency on the order of 15 to 40% are obtained by increasing the extent of laminar flow over lifting surfaces. Two methods of achieving laminar flow are being considered, natural laminar flow and laminar flow control. Natural laminar flow (NLF) relies primarily on airfoil shape while laminar flow control involves boundary layer suction or blowing with mechanical devices. The extent of natural laminar flow that could be achieved with consistency in a real flight environment at chord Reynolds numbers in the range of 30 x 10(6) power was evaluated. Nineteen flights were conducted on the F-111 TACT airplane having a NLF airfoil glove section. The section consists of a supercritical airfoil providing favorable pressure gradients over extensive portions of the upper and lower surfaces of the wing. Boundary layer measurements were obtained over a range of wing leading edge sweep angles at Mach numbers from 0.80 to 0.85. Data were obtained for natural transition and for a range of forced transition locations over the test airfoil.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Advan. Aerodyn.: Selected NASA Res.; p 11-20
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  • 64
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    Acoustic flight testing of advanced design propellers on a JetStar aircraft (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Advanced turboprop-powered aircraft have the potential to reduce fuel consumption by 15 to 30 percent as compared with an equivalent technology turbofan-powered aircraft. An important obstacle to the use of advanced design propellers is the cabin noise generated at Mach numbers up to .8 and at altitudes up to 35,000 feet. As part of the NASA Aircraft Energy Efficiency Program, the near-field acoustic characteristics on a series of advanced design propellers are investigated. Currently, Dryden Flight Research Center is flight testing a series of propellers on a JetStar airplane. The propellers used in the flight test were previously tested in wind tunnels at the Lewis Research Center. Data are presented showing the narrow band spectra, acoustic wave form, and acoustic contours on the fuselage surface. Additional flights with the SR-3 propeller and other advanced propellers are planned in the future.
    Keywords: ACOUSTICS
    Type: NASA. Langley Research Center Advan. Aerodyn.: Selected NASA Res.; p 1-10
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  • 65
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    Effect of heavy rain on aircraft (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A summary on heavy rain effects on aircraft aerodynamics validation of research and some wind shear accidents in which heavy rain were an important factor. Frost formation and what frost does to the lift and drag curves for an airfoil was examined. If frost could cause severe aerodynamic problems for both general aviation and transport aircraft due to its roughness, then heavy rain produce a similar result. The influencing parameters of heavy rain on an aircraft are studied. Sources of aerodynamic roughness due to rain and wind shear and heavy rain accidents are outlined.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Marshall Space Flight Center Proc.: 5th Ann. Workshop on Meteorol. and Environ. Inputs to Aviation Systems 76-80 (SEE N82-21139 12-01)
    Format: text
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  • 66
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    Meteorology impact on future aircraft design (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Meteorology impact on future aircraft design is discussed. Upcoming changes in both design and operations that will be influenced by the meteorological environment are outlined. Future and more nonconventional designs and meteorological impact brought about by operational changes over the next few years are examined.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Marshall Space Flight Center Proc.: 5th Ann. Workshop on Meteorol. and Environ. Inputs to Aviation Systems; p 29-34
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  • 67
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    Meteorological impact on aviation fuel efficiency (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The connection between fuel consumption and weather data is discussed. Fuel efficient flights creating adequate near real time weather information are examined. The lack of highly resolved real time and near real time wind and temperature data at flight altitudes is investigated. The existing systems, which is based on twice a day balloon observations, supplemented by pilot reports or other occasional data, is not adequate for optimum flight planning. The impacts of upper winds and temperatures on fuel efficiency and flight planning are not widely appreciated and developing new weather products are considered.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Marshall Space Flight Center Proc.: 5th Ann. Workshop on Meteorol. and Environ. Inputs to Aviation Systems; p 15-19
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  • 68
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    Chasing the Space Shuttle (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The use and modifications of the T-38 aircraft as chase planes for the STS-1 landing are discussed. Two planes tracked the approach at Edwards AFB, with the lead plane responsible for airspeed and altimetry calibration, technical photography, landing gear status, and height-above-touchdown calls; the second T-38 provided live TV and back-up. Modifications included extension of the landing gear extension speed, increasing the area of the speedbrakes, and installation of a TV system; the goal was to stay with the Shuttle below 40,000 ft while it descended at 15,000 ft/min. Ten T-38's were modified and the deployment of lead and back-up crews during the first Shuttle flight is outlined. Western Test Range C-band radar data of the Orbiter position were transformed into intercept coordinates and VHF relayed to the chase craft. Photographs were taken of the right and left sides and underside of the Shuttle while flying with the speedbrake up to match the Shuttle speed.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 69
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    Development of a comprehensive analysis for rotorcraft. II - Aircraft model, solution procedure and applications (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The development of a comprehensive analytical model of rotorcraft aerodynamics and dynamics is described. Particular emphasis is given to describing the reasons behind the choices and decisions involved in constructing the model. The analysis is designed to calculate rotor performance, loads and noise; helicopter vibration and gust response; flight dynamics and handling qualities; and system aeroelastic stability. It is intended for use in the design, testing and evaluation of a wide class of rotors and rotorcraft and to be the basis for further development of rotary wing theories. The general characteristics of the geometric, structural, inertial and aerodynamic models used for the rotorcraft components are described, including the assumptions introduced by the chosen models and the resulting capabilities and limitations. Finally, some examples from recent applications of the analysis are given.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Vertica; 5; 3, 19; 1981
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  • 70
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    Spectral variance of aeroacoustic data (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An asymptotic technique for estimating the variance of power spectra is applied to aircraft flyover noise data. The results are compared with directly estimated variances and they are in reasonable agreement. The basic time series need not be Gaussian for asymptotic theory to apply. The asymptotic variance formulae can be useful tools both in the design and analysis phase of experiments of this type.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America; vol. 69
    Format: text
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  • 71
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    Design for supercommuters (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Action to be taken to prepare to implement efficient, modern commuter aircraft for the 1990s is outlined. The increase in the contribution of jet fuel costs to aircraft direct operating costs (DOC) is noted as the motivation for the introduction of turboprop-powered commuter aircraft, which use 15-20% less fuel per seat mile at short stage lengths, to replace larger jet transports. Designs proposed by various manufacturers which will make use of existing technology for 19-, 30- and 50-seat aircraft capable of carrying a full payload of passengers and baggage for 600 n mi and optimized for minimum DOC over a 100-n mi stage length are presented, and the improvements in fuel usage, DOC and passenger comfort to be obtained with the use of advanced technology are pointed out. The goals and considered technologies of the dedicated small-transport aircraft technology program recommended by a commuter air transport subcommittee of the NASA Advisory Council Aeronautics Advisory Committee to speed the development of commuter technology are then presented, with attention given to efforts of analysis, design and testing of propulsion systems, structures, aerodynamics and systems intended to result in 16-24% savings in DOC and up to 40% savings in fuel. The commuter development plans of various manufacturers are also indicated.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Astronautics and Aeronautics; 19; Feb. 198
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  • 72
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    General aviation airplane fuel economy system model (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The aerodynamic characteristics which affect the fuel consumption of general aviation aircraft are outlined. All data are presented in the form of graphs.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Joint Univ. Program for Air Transportation Res., 1980; p 133-142
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  • 73
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    Measurement of sound absorption in the air (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The large temperature gradient in each section of the resonance tube resulting from the liquid nitrogen coolant necessitated a design modification to the cooling system. A timer and four solenoid valves were installed so that the coolant flow can be reversed periodically. The hardware and software for controlling the analog to digital converter and conversion rate were completed, and the system is operational. A duty cycle control circit was implemented so that on the sixteenth conversion a relay shuts off the vibration exciter used to generate the sound wave. Thus the starting point of each decay curve is exactly known. This information is necessary for evaluating the g digital decay information. The data acquisition and digital decay evaluation programs are described.
    Keywords: ACOUSTICS
    Type: Old Dominion Univ. Propagation of Sound Through the Earth's Atmosphere; p 1-3
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  • 74
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    High-frequency sound propagation in a spatially varying mean flow (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An equation for acoustic ray paths in a spatially varying mean flow has been examined to determine some of the characteristics of the flow gradient effects on sound propagation. In a potential flow the acoustic rays are deflected in the direction of increasing mean flow, and the gradient of the mean flow speed is the dominant factor causing the ray deflection. In contrast, in a sheared mean flow, the vorticity is the dominant factor in deflection of the acoustic rays.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America; vol. 70
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  • 75
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    Influence of landing gear flexibility on aircraft performance during ground roll (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An analysis is made of the influence of landing gear deflection characteristics on aircraft performance on the ground up to rotation. A quasi-steady dynamic equilibrium state is assumed, including other simplifying assumptions such as calm air conditions and normal aircraft lift and drag. Ground incidence is defined as the angle made by the mean aerodynamic chord of the wing with respect to the ground plane, and equations are given for force and balance which determine the quasi-equilibrium conditions for the aircraft during ground roll. Results indicate that the landing gear deflections lead to a substantial increase in the angle of attack, and the variation in the ground incidence due to landing gear flexibility could be as much as + or - 50%, and the reduction in tail load requirements almost 25%.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Aircraft; 18; Nov. 198
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  • 76
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    Design and performance of resonant-cavity parallel baffles for duct silencing (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Resonant-cavity parallel baffles, either empty or with a thin absorbent lining, have been investigated as an alternative to fiberglass-filled baffles commonly used to control noise emission from large ducts. A method for predicting silencer attenuation is described, and it is shown that the new type of baffle is characterized by an acoustic performance similar to that of fibrous baffles, while being virtually immune to such problems as clogging, erosion, or settling. The emphasis of the study is on insertion loss measurements in a 7 by 10 ft wind tunnel.
    Keywords: ACOUSTICS
    Type: Noise Control Engineering; 17; July-Aug
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  • 77
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    Finite element thermal analysis of convectively-cooled aircraft structures (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The design complexity and size of convectively-cooled engine and airframe structures for hypersonic transports necessitate the use of large general purpose computer programs for both thermal and structural analyses. Generally thermal analyses are based on the lumped-parameter finite difference technique, and structural analyses are based on the finite element technique. Differences in these techniques make it difficult to achieve an efficient interface. It appears, therefore, desirable to conduct an integrated analysis based on a common technique. A summary is provided of efforts by NASA concerned with the development of an integrated thermal structural analysis capability using the finite element method. Particular attention is given to the development of conduction/forced-convection finite element methodology and applications which illustrate the capabilities of the developed concepts.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 78
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    Predicted airframe noise levels for certification flights (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A correction is presented for a previously published inconsistency in predicted airframe noise values, which were based on approach velocities lower than those required for FAA certification. New figures are given for the following aircraft: DC-9-30, 727-200, A300-B2, L-1011, DC-10-10, and 747-200B. The new levels average 2.3 dB higher than those calculated for typical approach speeds.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Aircraft; 18; Sept
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  • 79
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    Development of a comprehensive analysis for rotorcraft. I - Rotor model and wake analysis (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The development of a comprehensive analytical model of rotorcraft aerodynamics and dynamics is described. Particular emphasis is given to describing the reasons behind the choices and decisions involved in constructing the model. The analysis is designed to calculate rotor performance, loads and noise; helicopter vibration and gust response; flight dynamics and handling qualities; and system aeroelastic stability. It is intended for use in the design, testing and evaluation of a wide class of rotors and rotorcraft, and to be the basis for further development of rotary wing theories. The general characteristics of the geometric, structural, inertial, and aerodynamic models used for the rotorcraft components are described, including the assumptions introduced by the chosen models and the resulting capabilities and limitations. Finally, some examples from recent applications of the analysis are given.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Vertica; 5; 2, 19; 1981
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  • 80
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    Aircraft design using the National Transonic Facility (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The utility of the cryogenic high Reynolds number test facility as a production tunnel is evaluated. Aerodynamic performance evaluation, numerical wing design verification, and high Reynolds number theoretical extensions are considered. A priority ranking of NTF uses from an airframe development viewpoint is presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center High Reynolds Number Res. - 1980; p 149-152
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  • 81
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    Technology development status at McDonnell Douglas (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The significant technology items of the Concorde and the conceptual MCD baseline advanced supersonic transport are compared. The four major improvements are in the areas of range performance, structures (materials), aerodynamics, and in community noise. Presentation charts show aerodynamic efficiency; the reoptimized wing; low scale lift/drag ratio; control systems; structural modeling and analysis; weight and cost comparisons for superplasticity diffusion bonded titanium sandwich structures and for aluminum brazed titanium honeycomb structures; operating cost reduction; suppressor nozzles; noise reduction and range; the bicone inlet; a market summary; environmental issues; high priority items; the titanium wing and fuselage test components; and technology validation.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Supersonic Cruise Res., 1979, Pt. 2; p 873-888
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  • 82
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    An assessment of buffer strips for improving damage tolerance (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Graphite/epoxy panels with buffer strips were tested in tension to measure their residual strength with crack-like damage. Panels were made with 45/0/-45/90(2S) and 45/0/450(2S) layups. The buffer strips were parallel to the loading directions. They were made by replacing narrow strips of the 0 deg graphite plies with strips of either 0 deg S-Glass/epoxy or Kevlar-49/epoxy on either a one for one or a two for one basis. In a third case, O deg graphite/epoxy was used as the buffer material and thin, perforated Mylar strips were placed between the 0 deg piles and the cross-plies to weaken the interfaces and thus to isolate the 0 deg plies. Some panels were made with buffer strips of different widths and spacings. The buffer strips arrested the cracks and increased the residual strengths significantly over those plain laminates without buffer strips. A shear-lag type stress analysis correctly predicted the effects of layups, buffer material, buffer strip width and spacing, and the number of plies of buffer material.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Supersonic Cruise Res., 1979, Pt. 2; p 657-673
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  • 83
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    Supersonic cruise research aircraft structural studies: Methods and results (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: NASA Langley Research Center SCAR in-house structural studies are reviewed. In methods development, advances include a new system of integrated computer programs called ISSYS, progress in determining aerodynamic loads and aerodynamically induced structural loads (including those due to gusts), flutter optimization for composite and metal airframe configurations using refined and simplified mathematical models, and synthesis of active controls. Results given address several aspects of various SCR configurations. These results include flutter penalties on composite wing, flutter suppression using active controls, roll control effectiveness, wing tip ground clearance, tail size effect on flutter, engine weight and mass distribution influence on flutter, and strength and flutter optimization of new configurations. The ISSYS system of integrated programs performed well in all the applications illustrated by the results, the diversity of which attests to ISSYS' versatility.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Supersonic Cruise Res., 1979, Pt. 2; p 617-656
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    Opportunities for structural improvements for an advanced supersonic transport vehicle (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The superplastically formed diffusion-bonded (SPF/DB) program has developed successfully and far enough to recommend that a major structural program to validate the weight and cost of SPF/DB sandwich titanium structure should be initiated. The NASA Langley study of wing and fuselage SPF/DB sandwich panels shows that this process is potentially structurally efficient. The Douglas SPF/DB expanded sandwich process that utilizes a welded core sheet that expands to face sheets proves to be very efficient. The theoretical weight optimization design charts for the wing and fuselage concepts were validated by small-scale tests. Mnay design applications were fabricated. Projecting the results of an SPF/DB sandwich airframe structure to a MDC AST design shows significant weight and cost savings. A 6 percent lower direct operating cost was calculated. A growth AST utilizing composites, metal matrices, and SPF/DB sandwich shows future promise for a post-1990 technology readiness. Titanium SPF/DB sandwich, compared to presently available aluminum structure, is superior for application to a Mach 2.2 supersonic transport.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Supersonic Cruise Res., 1979, Pt. 2; p 589-616
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  • 85
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    Detection of infrasound generated by Clear Air Turbulence (CAT) (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A unified data acquisiton system which is an AM carrier system consisting of a converter signal, conditioning electronics, and peripheral equipment was checked and calibrated and installed in a mobile van. A microphone array in the shape of a 244-m equilateral triangle was connected to the data acquisition system using 457-m long cables. Development of techniques for signal processing for interpreting the infrasonic signature (differentiating between CAT and other sources of infrasound) is summarized. Once patches of CAT are located in the atmosphere, corroboration can be achieved through test flights of aircraft into the suspected region.
    Keywords: ACOUSTICS
    Type: Old Dominion Univ. Propagation of Sound Through the Earth's Atmosphere; p 3-10
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  • 86
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    Exploratory flight test of advanced piloted spacecraft - Circa 1963 (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The NASA early experimental program for parawing and lifting body spacecraft recovery concepts is discussed. Simple hand drawings, in-house construction, and crude drop tests were used in lieu of a thorough stress analysis. The parawing (parasev) was controlled by manually shifting the center of gravity with respect to the center of pressure; the craft would take off while being towed at 40 KIAS. The M-2 lifting body was originally constructed with a 3/32 in. mahogany skin by a glider manufacturer and employed general aviation aircraft nose and main wheel assemblies. A minimum altitude of 200 ft was found acceptable for release of the parasev, allowing the pilot time to adjust for transients incurred at the tow release. A small landing assist rocket was furnished for the M-2/F-2 and X-24A lifting bodies to enhance stability, and landings at a maximum lift/drag ratio of 2.8 were successfully completed. The data gained were eventually applied in the development of the Shuttle.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 87
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    The X-14 - 24 years of V/STOL flight testing (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The X-14 V/STOL research aircraft made its first free-hover flight as a proof-of-concept test-bed on Feb. 19, 1957. With the exception of two subsequent modification periods (to X-14A and X-14B) this V/STOL 'workhorse' has been on continuous flight-test status as a research aircraft and flying classroom. The paper presents some of the highlights of its memorable 24-year flight-test career with special emphasis on projects which have contributed to V/STOL technology and on the test pilots who made it happen.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 88
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    Some applications of aerodynamic formulations to problems in aircraft dynamics (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Two applications of mathematical modeling to aerodynamic problems are cussed. The first application is an investigation of the capacity of a nonlinear aerodynamic mathematical model to describe the aerodynamic reactions on an airfoil with a deflecting flap in transonic flow. Flow field computational methods are used to evaluate the nonlinear, unsteady aerodynamic data in terms of characteristic motions called for by the model. Histories of unconstrained motions of the flap are generated from the flap equations of motion, with the aerodynamic reactions specified by the mathematical model. In the second application wing rock is investigated. The most recent model accommodates experimental results wing rock by admitting the existence of aerodynamic hysteresis in the variation of the steady state rolling moment coefficient with roll angle is described.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD Dyn. Stability Parameters; 15 p
    Format: text
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  • 89
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    Aerodynamic mathematical modeling - basic concepts (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The mathematical modeling of the aerodynamic response of an aircraft to arbitrary maneuvers is reviewed. Bryan's original formulation, linear aerodynamic indicial functions, and superposition are considered. These concepts are extended into the nonlinear regime. The nonlinear generalization yields a form for the aerodynamic response that can be built up from the responses to a limited number of well defined characteristic motions, reproducible in principle either in wind tunnel experiments or flow field computations. A further generalization leads to a form accommodating the discontinuous and double valued behavior characteristics of hysteresis in the steady state aerodynamic response.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD Dyn. Stability Parameters; 31 p
    Format: text
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  • 90
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    Practical aspects of instrumentation installation in support of subsystem testing (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Some of the problems associated with using military specification MIL-W-5088H as a guideline for wire gage selection are discussed. Examples of proper use of this specification as a criterion for interfacting wire bundles and connectors are provided. The quantitative results of 22 projects that have used the technique known as sneak analysis are reviewed and examples are given.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD Subsystem Testing and Flight Test Instr.; 16 p
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  • 91
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    Overview of advanced wing design (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Examples of experiment theory correlation are presented to give an indication of the capabilities and limitations of wing design and analysis for transonic applications by potential flow theory. The examples include correlations of experimental pressure distributions with theoretical results from isolated wing codes and wing-body codes. Both conservative and non conservative differencing as well as body and boundary layer corrections are considered. A full potential isolated wing code correlates well with data from an isolated wing test but may give poor prediction of the aerodynamic characteristics of some wing-body configurations. Potential flow wing body codes were found to improve the correlation for the wing-body configurations considered.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Advan. Aerodyn. and Active Controls; p 157-169
    Format: application/pdf
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  • 92
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    Status and future plans of the Drones for Aerodynamic and Structural Testing (DAST) program (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results from flight tests of the ARW-1 research wing are presented. Preliminary loads data and experiences with the active control system for flutter suppression are included along with comparative results of test and prediction for the flutter boundary of the supercritical research wing and on performance of the flutter suppression system. The status of the ARW-2 research wing is given.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Advan. Aerodyn. and Active Controls; p 21-36
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  • 93
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    Small transport aircraft technology (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The results of contracted studies identifying the potential benefits of advanced technology are presented. Current in house studies and research efforts are discussed. An overview of the proposed technology elements in STAT research is presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Advan. Aerodyn. and Active Controls; p 85-104
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  • 94
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    KC-135 winglet flight results (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Three KC-135 winglet configurations were flight tested for cant/incidence angles of 15 deg/-4 deg, 15 deg/-2 deg, and 0 deg/-4 deg, as well as the basic wing. The flight results for the 15 deg/-4 deg and basic wing configurations confirm the wind tunnel predicted 7% incremental decrease in total drag at cruise conditions. The 15 deg/-4 configuration flight measured wing and winglet pressure distributions, loads, stability and control, flutter, and buffet also correlate well with predicted values. The only unexpected flight results as compared with analytical predictions is a flutter speed decrease for the 0 deg/-4 deg configuration. The 15 deg/-2 deg configuration results show essentially the same incremental drag reduction as the 15 deg/-4 deg configuration; however, the flight loads are approximately 30% higher for the 15 deg/-2 deg configuration. The drag data for the 0 deg/-4 deg configuration show only a flight drag reduction.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center Advan. Aerodyn. and Active Controls; p 145-156
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  • 95
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    Investigation of powered nacelles on a high aspect ratio NASA supercritical wing, phase 2 (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A modified wing with the long core separate flow nacelle and several E(3) nacelles was utilized. The effects of nacelle and pylon cant angles and nacelle longitudinal and vertical location were investigated over a Mach number range from 0.70 to 0.83. The results at the cruise condition 0.82 Mach number and 0.55 lift coefficient are presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Advan. Aerodyn. and Active Controls; p 105-122
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  • 96
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    Transport aircraft flying qualities activities (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The optimal control model for pilot vehicle systems was used to develop a methodology for predicting pilot ratings for commercial transports. The method was tested by applying it to a family of transport configurations for which subjective pilot ratings were obtained. Specific attention is given to the development of the simulator program and procedures so as to yield objective and subjective performance data useful for a critical evaluation of the analytical method.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Advan. Aerodyn. and Active Controls; p 37-42
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  • 97
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    Experimental investigation of elastic mode control on a model of a transport aircraft (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 4.5 percent DC-10 derivative flexible model with active controls is fabricated, developed, and tested to investigate the ability to suppress flutter and reduce gust loads with active controlled surfaces. The model is analyzed and tested in both semispan and complete model configuration. Analytical methods are refined and control laws are developed and successfully tested on both versions of the model. A 15 to 25 percent increase in flutter speed due to the active system is demonstrated. The capability of an active control system to significantly reduce wing bending moments due to turbulence is demonstrated. Good correlation is obtained between test and analytical prediction.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-3472 , NAS 1.26:3472
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  • 98
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    Radiation losses in resonant tubes (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The role of radiation losses in a resonant tube - the transfer of sound energy from the test gas through the confines of the tube to the ambient atmosphere - is investigated both theoretically and experimentally. It is concluded that losses of this sort make no noticeable contribution to the background losses, even at high gas pressures. Nevertheless, if an axial resonant frequency of the test gas closely matches a longitudinal resonant frequency of the tube wall, the internal sound pressure can excite tube displacements of disproportionate magnitude and thus cause excessive losses, not due to radiation but rather to frictional dissipation related to the motion of the tube structure. This mechanism is effective when the mode numbers of the gas and tube have opposite parity, and makes sound absorption measurements at the fundamental gas frequency particularly problematical. An experimental investigation confirms the existence of such additional losses when the parity condition is fulfilled.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America; vol. 70
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  • 99
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    Torque generated by orthogonal acoustic waves - Theory (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analytical calculation of the torque generated by orthogonal waves is reported. This torque is a result of a viscous effect, rather than the Bernoulli effect as in Rayleigh's torque. The agreement between the reported experimental values and this calculation is excellent.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America; vol. 69
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    Modal content of noise generated by a coaxial jet in a pipe (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Measurements of the hydrodynamic pressure fluctuation levels showed that, for circular obstructions with a flow passage diameter less than one-half of the pipe diameter, hydrodynamic pressure fluctuations were small compared with the acoustic pressure, at locations greater than ten pipe diameters downstream of the restrictions. Thus, in the study currently reported, which was concentrated on measurement of the modal characteristics of the sound field downstream of the restrictions, special techniques to avoid contamination by hydrodynamic 'noise' were not necessary. The major results obtained in the study are scaling laws for the shape of the modal pressure spectrum and for the overall efficiency of noise generation. The characteristics of the modal pressure spectra are discussed. It is shown that the primary parameter controlling the spectrum shape is the frequency ratio (Helmholtz number/Strouhal number). The efficiency levels when plotted as a function of Mach number show a strong dependence on restriction size
    Keywords: ACOUSTICS
    Type: Journal of Sound and Vibration; 76; May 8
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