インパルス応答列による多入力多出力系のシステム同定(機械力学,計測,自動制御)

概要

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This paper presents a new algorithm for a multi-input multi-output (MIMO) system identification in the time domain using impulse responses. Eigensystem Realization Algorithm (ERA) realizes a single-input multi-output (SIMO) system using single impulse input, therefore we modify the method for dientifying the system matrix of MIMO system. Moreover, a recursive least-square iteration scheme is developed to refine input and output matrices of the system. In this manner, the input matrix is considered to be constructed by the mode shapes and actuator sensitivity matrix. Numerical simulation for an actual spacecraft-the Engineering Test Satellite-VI (ETS-VI) is performed to verify the new algorithm. In the example, the nominal dynamics model of ETS-VI, which has six rigid body modes and fourteen elastic modes derived from large flexible solar panels, is excited by six body-mounted thrusters each, and three translational velocities and three attitude rates are assumed to be measured simultaneously. The proposed method identifies all of fourteen natural frequencies, damping ratios and mode shapes. The results of the numerical example show the validity of the new identification scheme.
社団法人日本機械学会の論文
2007-02-25