Power/Response Spectrum Transformations in Equipment Qualification

[+] Author and Article Information
J. F. Unruh, D. D. Kana

Department of Engineering Mechanics, Southwest Research Institute, San Antonio, Tex. 78284

J. Pressure Vessel Technol 107(2), 197-202 (May 01, 1985) (6 pages) doi:10.1115/1.3264434 History: Received July 17, 1984; Revised November 28, 1984; Online November 05, 2009


Since its introduction a few years ago the use of the power/response spectrum transformation has gained considerable interest and acceptance, and a number of new applications of the transformation have been developed in the equipment qualification area. A brief review of the power/response spectrum transformation is given with a discussion of the input/output relationships for linear systems required for elevated power spectrum generation. Frequency content of earthquakelike signals is discussed with emphasis on the resolution given by the PSD. The problem of excessive ZPA due to inconsistent spectra enveloping and mechanical nonlinearities is also discussed. The PSD/RS transformation is applied to the problems of combining various dynamic load events, developing bounding spectra, and developing damping consistent test spectra. Development of elevated component spectra corrected for base overtest and generation from in-situ measurements is reviewed.

Copyright © 1985 by ASME
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