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  • METEOROLOGY AND CLIMATOLOGY  (15)
  • STRUCTURAL MECHANICS
  • 1990-1994  (20)
  • 1
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    Control of boundary layer transition location and plate vibration in the presence of an external acoustic field (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The experiment is aimed at controlling the boundary layer transition location and the plate vibration when excited by a flow and an upstream sound source. Sound has been found to affect the flow at the leading edge and the response of a flexible plate in a boundary layer. Because the sound induces early transition, the panel vibration is acoustically coupled to the turbulent boundary layer by the upstream radiation. Localized surface heating at the leading edge delays the transition location downstream of the flexible plate. The response of the plate excited by a turbulent boundary layer (without sound) shows that the plate is forced to vibrate at different frequencies and with different amplitudes as the flow velocity changes indicating that the plate is driven by the convective waves of the boundary layer. The acoustic disturbances induced by the upstream sound dominate the response of the plate when the boundary layer is either turbulent or laminar. Active vibration control was used to reduce the sound induced displacement amplitude of the plate.
    Keywords: STRUCTURAL MECHANICS
    Type: In: Structural dynamics: Recent advances; Proceedings of the 4th International Conference, Univ. of Southampton, United Kingdom, July 15-18, 1991 (A93-45104 18-39); p. 702-711.
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  • 2
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    VICONOPT - Program for exact vibration and buckling analysis or design of prismatic plate assemblies (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 29; 1927
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  • 3
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    Structural dynamic and aeroelastic considerations for hypersonic vehicles (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Structural dynamic and aeroelastic considerations applicable to hypersonic vehicles are discussed. Emphasis is given to aerospace plane configurations. The definition of aerothermoelasticity and the operational flight environment are reviewed, and structural dynamic and aeroelastic areas of concern are individually discussed, including vibration, landing and taxiing, propellant dynamics, acoustics, lifting surface flutter, panel flutter, control surface buzz, buffeting, gust response, and static aeroelasticity. Recent research results from all-moveable delta-wing aerolastic studies, engine inlet lip aeroelastic analysis, and studies of thermal effects on vibration frequencies, aerodynamic heating effects on flutter, and active control of aeroelastic response are reviewed.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 91-1255
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  • 4
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    HF Doppler and VHF radar observations of upper atmospheric disturbances caused by weak cold front during winter time (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The simultaneous use of the Taiwan VHF radar and the HF Doppler sounder for remote measurement of three-dimensional winds, gravity waves, and density perturbations at mesospheric and thermospheric heights is demonstrated. A special event of atmospheric disturbances caused by propagating gravity waves excited by weak convective motions in winter time were investigated. The three-dimensional wind velocities at different heights were determined, and the frequency, horizontal wavelength, vertical wavelength, and phase velocity of the gravity waves were measured. The subtropical, low-latitude site makes the VHF radar and HF Doppler array systems unique, and the observations especially valuable for space projects dealing with low-latitude atmosphere.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: AIAA PAPER 90-0483
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  • 5
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    User manual for VICONOPT: An exact analysis and optimum design program covering the buckling and vibration of prismatic assemblies of flat in-plane loaded, anisotropic plates, with approximations for discrete supports, and transverse stiffeners (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A computer program which is designed for efficient, accurate buckling and vibration analysis and optimum design of composite panels is described. The capabilities of the program are given along with detailed user instructions. It is written in FORTRAN 77 and is operational on VAX, IBM, and CDC computers and should be readily adapted to others. Several illustrations of the various aspects of the input are given along the example problems illustrating the use and application of the program.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-181966 , NAS 1.26:181966
    Format: application/pdf
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  • 6
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    Optimum design using VICONOPT, a buckling and strength constraint program for prismatic assemblies of anisotropic plates (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: A computer program for obtaining the optimum (least mass) dimensions of the kind of prismatic assemblies of laminated, composite plates which occur in advanced aerospace construction is described. Rigorous buckling analysis (derived from exact member theory) and a tailored design procedure are used to produce designs which satisfy buckling and material strength constraints and configurational requirements. Analysis is two to three orders of magnitude quicker than FEM, keeps track of all the governing modes of failure and is efficiently adapted to give sensitivities and to maintain feasibility. Tailoring encourages convergence in fewer sizing cycles than competing programs and permits start designs which are a long way from feasible and/or optimum. Comparisons with its predecessor, PASCO, show that the program is more likely to produce an optimum, will do so more quickly in some cases, and remains accurate for a wider range of problems.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers & Structures (ISSN 0045-7949); 43; 4, Ma; 699-708
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  • 7
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    Seasonal variation of surface radiation budget derived from International Satellite Cloud Climatology Project C1 data (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Surface radiation budget data are presented for the midseasonal months of July and October of 1983 and January and April of 1984. These data allow the examination of geographical and seasonal variations of the entire surface radiation budget from pole to pole. The latest flux estimation techniques have been used along with data from the International Satellite Cloud Climatology Project and the Earth Radiation Budget Experiment. Regional, zonal, and hemispheric distributions of the downward and net components of both shortwave and longwave fluxes and of the net total surface fluxes are determined. Seasonal flux variation per region, expressed as flux range, is illustrated for these components also. The estimated fluxes appear to be accurate to about 16 W/sq m on a global average, based on sensitivity analyses and comparisons with ground data. An analysis of flux errors showed that most of the error was attributable to errors in input data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; D14; p. 15,741-15,760.
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  • 8
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    The measurement of ultraviolet radiation and sunburn time over southern Ontario (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Studies of the depletion of ozone which have been conducted from the TOMS instrument on the NIMBUS 7 satellite indicate that total ozone has declined by 5 percent over the last 12 years at most mid-latitudes in the Northern Hemisphere typical of southern Ontario. The measurement of the actual resultant increases in UVB is now important. A monitoring program of UVB (biologically active solar ultraviolet radiation) has been conducted for the last 24 months at a site near Bolton, Ontario. The sunburn time varies from less than 17 minutes in late July, to over 4 hours in December on clear days. The levels depend on solar insolation and total ozone column. The ultraviolet levels are strongly affected by cloud and sky conditions. The implications of present and future depletion on the sunburn time are discussed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2; p 774-777
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  • 9
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    AVHRR and VISSR satellite instrument calibration results for both Cirrus and marine stratocumulus IFO periods (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Accurate characterizations of some cloud parameters are dependent upon the absolute accuracy of satellite radiance measurements. Visible wavelength measurements from both the AVHRR and VISSR instruments are often used to study cloud characteristics. Both of these instruments were radiometrically calibrated prior to launch, but neither has an onboard device to monitor degradation after launch. During the FIRE/SRB cirrus Intensive Field Operation (IFO), a special effort was made to monitor calibration of these two instruments onboard the NOAA-9 and GOES-6 spacecraft. In addition, several research groups have combined their efforts to assess the long-term performance of both instruments. These results are presented, and a limited comparison is made with the ERBE calibration standard.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: FIRE Science Results 1988; p 141-145
    Format: application/pdf
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  • 10
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    WCRP surface radiation budget shortwave data product description, version 1.1 (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Shortwave radiative fluxes which reach the Earth's surface are key elements that influence both atmospheric and oceanic circulation. The World Climate Research Program has established the Surface Radiation Budget climatology project with the ultimate goal of determining the various components of the surface radiation budget from satellite data on a global scale. This report describes the first global product that is being produced and archived as part of that effort. The interested user can obtain the monthly global data sets free of charge using e-mail procedures.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-107747 , NAS 1.15:107747
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