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A procedure for combining acoustically induced and mechanically induced loads (first passage failure design criterion)The combined load statistics are developed by taking the acoustically induced load to be a random population, assumed to be stationary. Each element of this ensemble of acoustically induced loads is assumed to have the same power spectral density (PSD), obtained previously from a random response analysis employing the given acoustic field in the STS cargo bay as a stationary random excitation. The mechanically induced load is treated as either (1) a known deterministic transient, or (2) a nonstationary random variable of known first and second statistical moments which vary with time. A method is then shown for determining the probability that the combined load would, at any time, have a value equal to or less than a certain level. Having obtained a statistical representation of how the acoustic and mechanical loads are expected to combine, an analytical approximation for defining design levels for these loads is presented using the First Passage failure criterion.
Document ID
19830019524
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Crowe, D. R. (Lockheed Missiles and Space Co. Sunnyvale, CA, United States)
Henricks, W. (Lockheed Missiles and Space Co. Sunnyvale, CA, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1983
Subject Category
Acoustics
Report/Patent Number
NASA-CR-166824
NAS 1.26:166824
LMSC-D885405-SS-1633
Accession Number
83N27795
Funding Number(s)
CONTRACT_GRANT: NAS5-25156
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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