動質量行列を用いた入力同定手法の分散評価(<特集>D&D2009)

Abstract

Transfer Path Analysis is a key technique for tackling with the noise and vibration problems, and the input identification accuracy influences the result of contribution analysis. The new input identification method (Apparent-Mass Method) was proposed by the authors in the past studies, and the improvement of identification accuracy was shown. However, the random noise included in the both excitation and response signals is inevitable. And these noises induce variation in the identification force due to the fluctuation of estimated apparent-mass matrix and measured operational response. Therefore, the variance evaluation for identified force is important in order to execute more accurate contribution analysis. In this paper, variance estimation methodology for identified force is proposed. Then the validity of proposed method is confirmed using numerical simulation and excitation test.