Method to specify sinusoidal vibration tests for product durabil

Details Method to specify sinusoidal vibration tests for product durabil Method to specify sinusoidal vibration tests for product durabil

1995-12-01

1996-10-15

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73662, G01M 700

Patent

active

055656188

ABSTRACT:
A method for determining the testing profile for accelerated laboratory sinusoidal vibrational testing of a product, includes the steps of (i) selecting the type and rate for the frequency sweep, (ii) developing a simplified composite Power Spectral Density function PSD.sub.j representing expected field vibration levels, (iii) developing the acceleration force function G.sub.T (f) corresponding to the PSD function, (iv) determining the stress response curve H(f) for the product, (v) selecting the number of frequency sweeps N.sub.w based on the testing equipment, the testing time available, and the range of acceleration forces required for implementing G.sub.T (f) from the relationship ##EQU1## (vi) recalculating the acceleration forces G.sub.u, and then (vii) testing the product using the selected variables to validate the required performance lifetime for the product when no test failures are observed over all of the N.sub.w test sweeps.

REFERENCES:
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patent: 5012428 (1991-04-01), Ueno et al.
patent: 5065618 (1991-11-01), Hodges, Sr. et al.
patent: 5179860 (1993-01-01), Tsuboi
patent: 5291419 (1994-03-01), Satoh et al.
patent: 5299459 (1994-04-01), Underwood

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