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针对闭环系统中时变状态空间模型和模态参数的辨识问题,提出一种递推辨识格式,将这种格式与递推子空间方法结合,得到一种辨识方法.该方法通过重建输入输出数据之间的关系,递推辨识得到闭环系统的时变状态空间模型和模态参数.算例研究了系统在模态参数突变和周期变化两种情况下的辨识问题,仿真结果表明,所提出算法能有效辨识线性时变反馈系统的状态空间模型和模态参数.
Aiming at the problem of time-varying state space model and modal parameter identification in closed-loop system, a recursive identification scheme is proposed. Combining this scheme with the recursive subspace method, an identification method is obtained. By rebuilding the input and output data The recursive identification is used to obtain the time-varying state space model and the modal parameters of the closed-loop system.Examples are studied for the identification of the system under both the sudden and periodic changes in modal parameters.The simulation results show that the proposed algorithm It can effectively recognize the state space model and modal parameters of linear time-varying feedback system.