Identification of Modal Parameters by Frequency Domain Subspace Method (Consideration of Residual Terms and Estimation of Model Order)

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  • 周波数領域部分空間法によるモード特性同定（剰余項の考慮とモデル次数の推定について）

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It is very important to understand the dynamic characteristics of machinery and experimental modal analysis is widely used as a basic tool for machine design. Various methods to identify the modal parameters of structures by the vibration test have been proposed. Recently, the frequency domain subspace method employing frequency response functions has been developed. In general, it is easier to overview the dynamic properties of structures in frequency domain than in time domain. In this paper, the modal parameters are identified by the frequency domain subspace algorithm and the residual terms derived from rigid body motions are considered. The Akaike Information Criterion is used because of the importance to determine the model order, which is related to the order of the state space model derived by the subspace method. The proposed procedure is then applied to identify the modal parameters of an aluminum circular plate with a hole.

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