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  • 1
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    Fatigue-failure load indicator (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Device easily and economically records loads at instant of failure.
    Schlagwort(e): MECHANICS
    Materialart: LAR-12027 , NASA Tech Briefs (ISSN 0145-319X); 2; 2; P. 3
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Fatigue failure load indicator (1979)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An indicator for recording the load at which a fatigue specimen breaks during the last cycle of a fatigue test is described. A load cell is attached to the specimen which is alternately subjected to tension and compression loads. The output of the load cell which is proportional to the load on the specimen is applied to the input of a peak detector. Each time the specimen is subjected to a compression load, means are provided for applying a positive voltage to the rest of the peak detector to reset it. During the last cycle of the tension load the peak detector measures the maximum load on the specimen. Means are provided for disconnecting the load cell from the peak detector when there is a failure in the specimen.
    Schlagwort(e): STRUCTURAL MECHANICS
    Format: application/pdf
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  • 3
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    Numerical determination of the transmissibility characteristics of a squeeze film damped forced vibration system (1976)
    In:  CASI
    Details
    Publikationsdatum: 2006-08-09
    Beschreibung: Numerical solutions of the governing equations of motion of a liquid squeeze film damped forced vibration system were carried out to examine the feasibility of using a liquid squeeze film to cushion and protect large structures, such as buildings, located in areas of high seismic activity. The mathematical model used was that for a single degree of freedom squeeze film damped spring mass system. The input disturbance was simulated by curve fitting actual seismic data with an eleventh order Lagranging polynomial technique. Only the normal component of the seismic input was considered. The nonlinear, nonhomogeneous governing differential equation of motion was solved numerically to determine the transmissibility over a wide range of physical parameters using a fourth-order Runge-Kutta technique. It is determined that a liquid squeeze film used as a damping agent in a spring-mass system can significantly reduce the response amplitude for a seismic input disturbance.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 1; p 327-338
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    A new two-dimensional oscillating wing apparatus for unsteady aerodynamics research (1978)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-22
    Beschreibung: An apparatus for experimental research into unsteady transonic flows is described. The apparatus, as installed in the NASA-Ames 11 by 11 Foot Transonic Wind Tunnel, can impart full two-degree-of-freedom motions at reduced frequencies to 0.3, oscillatory amplitudes to tn-2 degs, mean angles to 12 degs, Mach numbers to 1.4 and Reynolds numbers to 12x10. The test wing is fully instrumented for dynamic waveform measurements and the data can be acquired, processed, and displayed in real-time with a new computational data acquisition system. Following a description of the apparatus, sample data from a recently completed test program is presented.
    Schlagwort(e): RESEARCH AND SUPPORT FACILITIES (AIR)
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 2; p 671-688
    Format: text
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  • 5
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    Structural alignment sensor (1978)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: Comparative Michelson interferometers are discussed as well as the operating range potential of a structural alignment sensor (SAS) which requires only one laser mode. Schematics are presented for the distance measurement logic, the basic SAS system, the SAS optical layout, the coarse measurement signal processor, and the measured range resolution.
    Schlagwort(e): LAUNCH VEHICLES AND SPACE VEHICLES
    Materialart: NASA. Langley Res. Center Large Space Systems Technol., Vol. 1; p 491-505
    Format: text
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  • 6
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    Determination of the structure and heating mechanisms of coronal loops from soft X-ray observations with the solar probe (1978)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: High resolution soft X-ray imaging from the solar probe is justified in terms of the expected scientific returns which include the determination of the temperature and density structure of a coronal loop. The advantages of the grazing incidence telescope over the multiple pinhole camera are discussed. An instrument package is described which includes a grazing incidence mirror, a thermal prefilter, a three position filter wheel and a focal plane detector baselined as an 800 by 800 back-illuminated charge coupled device. The structural assembly together with the data processing equipment would draw heavily on the designs being developed for the Solar Polar Mission.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: JPL A Close-up of the Sun; p 94-110
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    A remote sensing laser fluorometer (1975)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A sensor is reported which is able to identify certain specific substances in water by means of their fluorescence spectra. In particular, the sensor detects oil, ligninsulfonates and chlorophyll. The device is able to measure the fluorescence spectra of water at ranges up to 75 m and to detect oil spills on water at altitudes up to 300 m. Blue light from a laser is used to excite the fluorescence of the target. Any light from the ambient background illumination, from the reflected laser light or from the induced fluorescence is gathered by a small telescope focused on the target. Optical filters are used to block the reflected laser light and to select the wavelengths of interest in the fluorescence spectrum of the target. The remaining light is detected with a photomultiplier tube. The amplitude of the laser induced fluorescence in the wavelength interval selected by the optical filters is displayed on a meter or strip chart recorder.
    Schlagwort(e): LASERS AND MASERS
    Materialart: NASA. Wallops Station The Use of Lasers for Hydrographic studies; p 173-196
    Format: text
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  • 8
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    Hydrodynamic effects in the atmosphere of variable stars (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Numerical models of variable stars are established, using a nonlinear radiative transfer coupled hydrodynamics code. The variable Eddington method of radiative transfer is used. Comparisons are for models of W Virginis, beta Doradus, and eta Aquilae. From these models it appears that shocks are formed in the atmospheres of classical Cepheids as well as W Virginis stars. In classical Cepheids, with periods from 7 to 10 days, the bumps occurring in the light and velocity curves appear as the result of a compression wave that reflects from the star's center. At the head of the outward going compression wave, shocks form in the atmosphere. Comparisons between the hydrodynamic motions in W Virginis and classical Cepheids are made. The strong shocks in W Virginis do not penetrate into the interior as do the compression waves formed in classical Cepheids. The shocks formed in W Virginis stars cause emission lines, while in classical Cepheids the shocks are weaker.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Goddard Space Flight Center Cepheid Modeling; p 71-83
    Format: text
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  • 9
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    Mean colors of Cepheids (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Color observations of Cepheids can be interpreted by a color effective temperature relation to give different T sub e values for each kind of mean color. Here, theoretical colors from numerical integrations of Cepheid pulsations are used to determine the proper method of taking the color mean in order to get, by the color T sub e relation, the correct nonpulsating T sub e.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Goddard Space Flight Center Cepheid Modeling; p 43-55
    Format: text
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  • 10
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    Thermal expansion and Grueneisen parameters of InBi (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Schlagwort(e): SOLID-STATE PHYSICS
    Materialart: Journal of Applied Physics; 46; Jan. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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