ARMAモデルを用いた振動モード特性の同定法 : 第2報,スカラー法とベクトル法の比較

抄録

This paper presents a poly-reference modal identification method which is based on multivariate ARMA (autoregressive moving average process) model fitting. The mono-reference method as a scalar approach based on single variate ARMA model fitting was proposed in the first report. This report presents a poly-reference method as a vector approach which develops the scalar method by state-space formulation and the numerical solution of an algebraic equation is replaced by the numerical solution of an eigen problem. As a fundamental example, a three-degrees-of-freedom lumped-mass system is identified by the two methods with the aid of numerical simulation. From the comparison of the results obtained through the scalar method with those obtained through the vector method, it was confirmed that the vector method has the advantage over the scalar method particularly in obtaining accurately identified modal parameters.