Resumo

HEYNS, P.S.. Modal testing with natural excitation using a time series approach. R&D j. (Matieland, Online) [online]. 1995, vol.11, pp.34-39. ISSN 2309-8988.

Conventional modal testing requires artificial excitation of the test structure under well-controlled conditions. This requirement has severely restricted the use of modal testing for troubleshooting on large industrial structures. With this work a technique for the identification of the modal parameters of naturally excited structures, requiring no artificial excitation or measurement of the input forces, is succinctly presented. The technique utilizes time series analysis of the measured response data only, assuming perturbation of the structure through initial displacement, impulse or random excitation. The viability of the technique is then investigated through a numerical example designed to illustrate several important features of modal testing in industrial applications.

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