FFT法を用いた打撃振動実験におけるForce & Response窓関数の改良

概要

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In this paper, the authors propose a drastic improvement with regard to the force-response window function, which is commonly used on impact vibration testing. The customary force-response window function pairs a rectangular window function for impulsive force signals and an exponential function for vibration response signals. The three dynamic characteristics : inertia, damping and stiffness, are measured with distortion since neither is an actual force signal an exact impulse, nor is data acquisition triggered at t=0 for the exponential window function. Consequently, modal parameters are necessarily identified with bias errors that cannot be ignored in the measured data. Bias errors cannot be removed by any post-treatment techniques because an actual force is never an exact impulse. An improved force-response window function frees the experimental results obtained by impact vibration testing from the problem of the bias error.
社団法人日本機械学会の論文
1993-06-25