Elimination of Support Effects in Modal Testing

Jun Ren; Shu Sheng Bi; Wei Wang; Guang Hua Zong

doi:10.4028/www.scientific.net/AMM.226-228.48

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 226-228Elimination of Support Effects in Modal Testing

Elimination of Support Effects in Modal Testing

Abstract:

In modal testing, the measured Frequency Response Functions (FRFs) are often inaccurate due to the adverse mechanical effects, such as mass-loading effects of transducers, shaker-structure interaction and the support effects. This paper deals with the elimination of the support effects from measured FRFs using dynamic substructure method. Both stiffness and damping are considered in the support effects. The validity of the method is proved in a simulated modal test. It is shown that with the given support conditions the affected FRFs can be corrected provided that some additional FRFs concerned with the support point are also measured. Finally, performance of this method is assessed with noisy measured data. Simulation shows that 1% white noise is acceptable in the proposed correction method.

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Periodical:

Applied Mechanics and Materials (Volumes 226-228)

Pages:

48-51

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.226-228.48

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Online since:

November 2012

Authors:

Jun Ren, Shu Sheng Bi, Wei Wang, Guang Hua Zong

Keywords:

Frequency Response Functions (FRFs), Modal Testing, Support Conditions, Support Effects

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