モード減衰比の推定精度に関する研究

概要

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The purpose of this paper is to investigate the effect of measurement errors on the modal damping ratio. Errors in estimating modal damping ratio are derived for various curve-fitting methods. For the iterative method, errors in estimating modal damping ratio are induced by bias errors in the frequency response function. Thus some analytical relations are derived between bias errors and the vibrating system's time constant. Moreover, we also discuss the effect of pre-trigger to capture time-sequence data. The relations between bias errors and errors in modal damping ratio are investigated by numerical experiments and vibrating tests. Next, for Prony's method, measurement errors are sensitive to the relation between sampling rate and modal frequency. Analytical relations are established between data capture conditions and measurement errors in modal damping ratio.
一般社団法人日本機械学会の論文
1995-02-25