Abstract

A method of component mode synthesis in which a majority of the dynamic characteristics of individual components are determined by modal testing is described. For the purpose of testing, the component can be supported on a suitable number of rigid supports. Alternatively, the test can be carried out in a free–free configuration, in which very flexible cables are used to hold the component. In either case, a number of practical difficulties arise. A new approach to modal testing in which the fixed–fixed modes of the component are obtained from a test configuration in which the component is held by supports of arbitrary characteristics is described. A complete theoretical formulation is developed. Computer simulation studies are carried out to determine the sensitivity of the calculated mode shapes and frequencies of the assembled structure to the various measurement errors in modal testing. Some results from these studies are presented.

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