モード解析に関する研究 : 第8報,周波数応答関数の分散の推定と曲線適合への応用

概要

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Modal analysis is wide spread and many curve-fit techniques which estimate modal parameters, such as natural frequencies, modal damping ratios, natural modes have been developed. A new method based on the Maximum Likeihood Principle which utilizes the Frequency Response Function (FRF) as input data has been proposed by one of the authors. According to that method, it is necessary to estimate not only FRF itself, but also the variance of the FRF by a vibration test. Following the previous report, this paper presents an estimation method of the FRF's variance for the "H_v" estimator in the case of multipoint excitation. furthermore an approximate estimation method of the H_v's variance is presented aiming at the convenience of calculation. Errors of modal parameters estimated by the Maximum Likeihood Method are also evaluated in the form of standard deviation.
1989-07-25