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《Journal of China Agricultural University》 2002-06
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The Method for Improving Precision of Estimating Modal Parameter

Zhang Ping, Chen Kuifu (College of Applied Engineering Sciences, China Agricultural University, Beijing 100083, China)  
For sparse modal structure, a method of estimating natural frequency and damping ratio was developed. In this method, FRF's three spectrum Lines in the neighbour of resonance peaks are used. Estimating formula is deduced out. Taking a simple beam as an example, this method is tested. In wide band excitation, the estimating result is compared with Zoom FFT's result. It is demonstrated that this method is convenient and accurate in estimating vibration modal parameter.
【CateGory Index】: O327
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