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  • 1
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    Evaluation of a procedure for the analysis of nonstationary vibroacoustic data (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Numerical techniques for the spectral analysis of vibration data from space-vehicle launches are described and demonstrated. A nonstationary product model described by Bendat and Piersol (1986) and its locally stationary version (Silverman, 1957) are applied to Space Shuttle flight data, and the results are presented in extensive graphs. It is shown that the nonstationary model can analyze data from longer sampling periods and thus significantly reduce random error; this in turn leads to vibration spectra lower than those obtained with short-duration models.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Journal of Environmental Sciences (ISSN 0022-0906); 32; 35-42
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Guidelines for Dynamic Environmental Criteria: An Invitation to Participate in Their Development (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effects of Triaxial and Uniaxial Random Excitation on the Vibration Response and Fatigue (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Triaxial and uniaxial random vibration was applied to a typical item of aerospace equipment, and.
    Type: 66th Shock and Vibration Symposium; Biloxi, MS; United States|Proc., 66th Shock and Vibration Symposium
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Investigation of Acoustic Fields for the Cassini Spacecraft: Reverberant Versus Launch Environments (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The characterization and understanding of the acoustic field within a launch vehicle's payload fairing (PLF) is critical to the qualification of a spacecraft and ultimately to the success of its mission. Acoustic measurements taken recently for the Cassini mission have allowed unique opportunities to advance the aerospace industry's knowledge in this field. Prior to its launch, the expected liftoff acoustic environment of the spacecraft was investigated in a full-scale acoustic test of a Titan IV PLF and Cassini simulator in a reverberant test chamber. A major goal of this acoustic ground test was to quantify and verify the noise reduction performance of special barrier blankets that were designed especially to reduce the Cassirii acoustic environment. This paper will describe both the ground test and flight measurements, and compare the Cassini acoustic environment measured during launch with that measured earlier in the ground test. Special emphasis will be given to the noise reduction performance of the barrier blankets and to the acoustic coherence measured within the PLF.
    Keywords: Acoustics
    Type: NASA/TM-2000-209387 , E-11814 , AIAA Paper 99-1985 , NAS 1.15:209387 , Aerocoustics; May 10, 1999 - May 12, 1999; Bellevue, WA; United States
    Format: application/pdf
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  • 5
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    Derivation of Acoustic Criteria for the Cassini Spacecraft and Comparison with Flight Data (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Acoustic measurements from eight pre-Cassini Titan IV flights, and an acoustic test of a Cassini simulator and Titan payload fairing (PLF), were used to derive acoustic flight and test criteria for the Cassini spacecraft. The flight and ground test data were used or modified to account for the following factors: (a) noise-spike contamination of flight data, (b) spatial and flight-to-flight variations of flight data, (c) application of a thicker banier-blanket to the PLF for the Cassini mission, (d) effects of locating two Cassini assemblies, the Huygens Probe, and the High Gain Antenna (HGA), near the PLF, and (e) higher thrust of upgraded Titan solid rocket motors (SRMS) for the Cassini mission. An overall sound pressure level (OA SPL) of 145 dB was verified for the protoflight acoustic test criteria for the Cassini spacecraft. Cassini flight liftoff data showed an average OA SPL of 133 dB.
    Keywords: Acoustics
    Type: International Congress on Sound and Vibration; Jul 05, 1999 - Jul 08, 1999; Lyngby; Denmark
    Format: application/pdf
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  • 6
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    Proposed military handbook for dynamic data acquisition and analysis - An invitation to review (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A draft Military Handbook prepared under the sponsorship of the USAF Space Division is presently being distributed throughout the U.S. for review by the aerospace community. This comprehensive document provides recommended guidelines for the acquisition and analysis of structural dynamics and aeroacoustic data, and is intended to reduce the errors and variability commonly found in flight, ground and laboratory dynamic test measurements. In addition to the usual variety of measurement problems encountered in the definition of dynamic loads, the development of design and test criteria, and the analysis of failures, special emphasis is given to certain state-of-the-art topics, such as pyroshock data acquisition and nonstationary random data analysis.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Aerospace Testing Seminar; Mar 13, 1990 - Mar 15, 1990; Manhattan Beach, CA; United States
    Format: text
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