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TECHNICAL BRIEFS

Improvement of Response Spectrum Specifications in Dynamic Testing

[+] Author and Article Information
C. W. de Silva

Department of Mechanical Engineering, The University of British Columbia, Vancouver, B. C. V6T 1W5

M. Singh

Carnegie Mellon University, Pittsburgh, Pa 15213

J. Zaldonis

Westinghouse R&D Center, Pittsburgh, Pa 15235

J. Eng. Ind 112(4), 384-387 (Nov 01, 1990) (4 pages) doi:10.1115/1.2899605 History: Received July 01, 1987; Revised January 01, 1990; Online April 08, 2008

Abstract

Required response spectra (RRS) are commonly used as dynamic-test specifications in product qualification. RRS specification for a product is normally developed by considering the operating environment of the product. This paper presents a technique to improve the RRS specification for a qualification test by employing available dynamic information on the test object. Specifically, a model of the test object subjected to support-motion inputs is employed. In practice, a model for the test object can be conveniently determined by experimental modal analysis or by the finite element method. The method presented in this paper may be viewed as a way to apportion the energy of test excitations among input locations of a test object in order to optimize a test objective. The underlying theory of the method of modifying a specified RRS is outlined and the computational steps of the method are given. A numerical example is presented to illustrate the use of the method.

Copyright © 1990 by The American Society of Mechanical Engineers
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