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  • 11
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    The development of vibration test specifica- tions for spacecraft applications (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Flight vehicle vibration test specifications - data acquisition and reduction, environmental prediction, data grouping, environmental and damage simulation, and laboratory testing
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-234
    Format: application/pdf
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  • 12
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    Evaluation of Aero Commander sidewall vibration and interior acoustic data: Static operations (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Results for the vibration measured at five locations on the fuselage structure during static operations are presented. The analysis was concerned with the magnitude of the vibration and the relative phase between different locations, the frequency response (inertance) functions between the exterior pressure field and the vibration, and the coherent output power functions at interior microphone locations based on sidewall vibration. Fuselage skin panels near the plane of rotation of the propeller accept propeller noise excitation more efficiently than they do exhaust noise.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-159290 , BBN-4016
    Format: application/pdf
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  • 13
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    Data analysis and noise prediction for the QF-1B experimental fan stage (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of a fan noise data analysis and prediction effort using experimental data obtained from tests on the QF-1B research fan are described. Surface pressure measurements were made with flush mounted sensors installed on selected rotor blades and stator vanes and noise measurements were made by microphones located at the far field. Power spectral density analysis, time history studies, and calculation of coherence functions were made. The emphasis of these studies was on the characteristics of tones in the spectra. The amplitude behavior of spectral tones was found to have a large, often predominant, random component, suggesting that turbulent processes play an important role in the generation of tonal as well as broadband noise. Inputs from the data analysis were used in a prediction method which assumes that acoustic dipoles, produced by unsteady blade and van forces, are the important source of fan noise.
    Keywords: ACOUSTICS
    Type: NASA-CR-135066 , BBN-3338
    Format: application/pdf
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  • 14
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    Analytical prediction of aerospace vehicle vibration environments (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Considerable attention has been given recently to the formulation and validation of analytical models for the prediction of aerospace vehicle vibration response to acoustic and fluctuating pressures. This paper summarizes the development of such analytical models for two applications, (1) structural vibrations of the Space Shuttle orbiter vehicle due to broadband rocket noise and aerodynamic boundary layer turbulence, and (2) structural vibrations of general aviation aircraft due to discrete frequency propeller and reciprocating engine exhaust noise. In both cases, the spatial exterior excitations are convected pressure fields which are described on the basis of measured cross spectra (coherence and phase) information. Structural modal data are obtained from analytical predictions, and structural responses to appropriate excitation fields are calculated. The results are compared with test data, and the strengths and weaknesses of the analytical models are assessed.
    Keywords: ACOUSTICS
    Type: ASME PAPER 81-DET-29 , American Society of Mechanical Engineers, Design Engineering Technical Conference; Sept. 20-23, 1981; Hartford, CT
    Format: text
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  • 15
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    Evaluation of aero Commander propeller acoustic data: Static operations (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Acoustic data are analyzed from a series of ground tests performed on an Aero Commander propeller-driven aircraft with an array of microphones flush-mounted on one side of the fuselage. The analyses were concerned with the propeller blade passage noise during static operation at several different engine speeds and included calculations of the magnitude and phase of the blade passage tones, the amplitude stability of the tones, and the spatial phase and coherence of the tones. The results indicate that the pressure field impinging on the fuselage represents primarily aerodynamic (near field) effects in the plane of the propeller at all frequencies. Forward and aft of the propeller plane aerodynamic effects still dominate the pressure field at frequencies below 200 Hz; but at higher frequencies, the pressure field is due to acoustic propagation from an equivalent center located about 0.15 to 0.30 blade diameters inboard from the propeller hub.
    Keywords: ACOUSTICS
    Type: NASA-CR-158919
    Format: application/pdf
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  • 16
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    An evaluation of Space Shuttle STS-1 payload bay acoustic data and comparison with predictions (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During the first launch (STS-1) of the Space Shuttle orbiter vehicle, sound pressure levels were measured at several locations in the payload bay of the vehicle and on the exterior surface. The data were obtained in order to provide validation for prediction procedures for interior and exterior sound pressure levels and to determine, independently, the acoustic environment in the payload bay during actual launch conditions.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-166811 , NAS 1.26:166811 , REPT-4738
    Format: application/pdf
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  • 17
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    Experimental studies of the Space Shuttle payload acoustic environment (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Two series of experiments were conducted to reduce the uncertainties concerning the Space Shuttle payload bay acoustic environment. Tests using a one-fifth scale model showed large changes in level below 125 Hz with the introduction of typical payloads. The changes were associated with particular acoustic modal behavior and were sensitive to the type of acoustic excitation. Another series of experiments evaluated the noise reduction of the first orbiter vehicle (OV-101). The results showed consistently greater noise reduction for grazing excitation than for diffuse excitation. The results were extrapolated to OV-102 using mass law relations and acceleration measurements.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: SAE PAPER 770973 , Aerospace Meeting; Nov 14, 1977 - Nov 17, 1977; Los Angeles, CA
    Format: text
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  • 18
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    Summary of random vibration prediction procedures (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Summary of random vibration prediction procedures for aerospace vehicles, with bibliography
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-1302
    Format: application/pdf
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  • 19
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    A method for predicting launch vehicle vibration levels in the region of the spacecraft adaptor (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Prediction curves for launch vehicle vibration levels in region of spacecraft adaptor
    Keywords: SPACE VEHICLES
    Type: NASA-CR-1227 , MAC-709-10
    Format: application/pdf
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  • 20
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    Power spectra measurements for spacecraft vibration data. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Time varying power spectrum characteristics of spacecraft launch vibration data noting error reduction in measurements
    Keywords: STRUCTURAL MECHANICS
    Format: text
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