Measuring and testing – Vibration – Fatigue study
Patent
1997-09-30
1999-10-12
Oda, Christine K.
Measuring and testing
Vibration
Fatigue study
36446816, 702 34, 702 56, 702113, G01M 702
Patent
active
059658169
ABSTRACT:
An application program and computer system for determining the testing profile for accelerated laboratory random vibrational testing of a product, including the application program steps of (i) selecting the frequency range covered in the laboratory accelerated testing, (ii) developing a simplified composite Power Spectral Density function PSD.sub.j (f) representative of the PSD for random vibration loadings in expected field vibration levels, (iii) developing the shape of PSD.sub.T for producing on the product the test acceleration forces corresponding to the PSD.sub.j function, (iv) calculating the stress response curve H(f) for the product representative of the transmissibility function from the input acceleration forces to the local vibration stress forces, (v) selecting the test duration, and then calculating the amplification factor from the relationship ##EQU1## (vi) recalculating the accelerated PSD profile, PSD.sub.T (f) for testing based on the selected test duration and the amplification factor: ##EQU2## and then (vii) testing the product using the selected PSD function, to validate the required performance lifetime for the product when no test failures are observed over all of the T hours.
REFERENCES:
patent: 3710082 (1973-01-01), Sloane et al.
patent: 5012428 (1991-04-01), Ueno et al.
patent: 5047947 (1991-09-01), Stump
patent: 5179860 (1993-01-01), Tsuboi
patent: 5270957 (1993-12-01), Murray
patent: 5278495 (1994-01-01), Beaton et al.
patent: 5282150 (1994-01-01), Yamada
patent: 5291419 (1994-03-01), Satoh et al.
patent: 5299459 (1994-04-01), Underwood
patent: 5301118 (1994-04-01), Heck et al.
patent: 5565618 (1996-10-01), Hu
patent: 5767406 (1998-06-01), Hu
"Role of Failure-Mechanism Identification in Accelerated Testing", by J. M. Hu, D. Barker, A. Gasgupta and A. Arora, Journal of the IES, Jul./Aug. 1993, pp. 39-46.
"Physics-of-Failure-Based Reliability Qualification of Automotive Electronics", by J. M. Hu, Communications in RMS, Jul., 1994, pp. 21-33.
Life Prediction and Acceleration Based on Power Spectral Density of Random Vibration, by J. M. Hu, Proceedings-Institute of Environmental Sciences, 1994, pp. 60-68 (no month).
"Test-Time Compression for Qualification Testing of Electronic Packages: a Case Study", by T. P. Rothman, A. Gasgupta and J. M. Hu, 1995 Proceedings Annual Reliability and Maintainability Symposium, pp. 246-252 (no month).
Dixon Richard D.
Oda Christine K.
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