実験モード解析によるモーダルパラメータの分散評価とそれに基づく精度の最適化

概要

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The objects of the present paper are to propose a variance evaluation method of modal parameters identified by the least square method with an experimental transfer function, and to show that the evaluated variances can be used to optimize the accuracy of the modal parameters at selection of proper excitation type, weighting function and so forth. The variances of the modal paramenters are evaluated by the first order approximation with the discrete values of experimental transfer function as stochastic variables, where the variance of the transfer function are evaluated with the coherence function based on a theory of statistical error. The results on a simple beam made of acrylic resin show that the variances can used to optimize in accuracy of the modal parameters, and the results on the cover of an outboard motor show that the proposed variance evaluation method is applicable to actual structures.
一般社団法人日本機械学会の論文
1988-11-25