两输入两输出(TITO)系统的基于频域的闭环辨识方法

Method of closed-loop identification based on frequency domain for two-input and two-output (TITO) systems

提出了一种面向工程应用的两输入两输出(TITO)过程的在线闭环辨识方法。该方法首先通过两个设定值阶跃测试估出频率响应,然后再通过在频域中多个点处模型匹配辨识出过程的传递函数矩阵。该辨识方法只需要过程的输入输出响应数据,不需要过程动态特性的先验知识。典型的TITO过程的仿真结果证明了该方法的有效性和实用性。

An engineering oriented on-line identification technique for a two-input and two-output （TITO） closed-loop control system was presented. By two set-point change tests, the frequency response in the range of interest corresponding to phase lag were estimated, and the parameters of transfer function matrix were identified by matching the model in the frequency domain. The proposed identification method only requires response data of process input and output, and no prior knowledge of the process dynamics is needed. The typical TITO processes were employed to illustrate the effectiveness and practicability of proposed method.