一种基于改进双通道继电测试的闭环辨识方法研究

Closed-loop identification method based on improved two-channel relay feedback

基于双通道继电反馈测试及其改进方案 ,提出一种提取 SISO系统频域信息的闭环辨识测试方法。该方法具有许多有意义的特性 ,能在很大程度上克服现有辨识测试方法的问题与不足。在充分获取系统频域信息的基础上 ,引入频域辨识算法得到系统的低阶传递函数模型。对两个典型过程的仿真取得了良好的效果 ,表明了所提出方法的有效性。

Based on the two-channel relay feedback and its improved version, a novel closed-loop identification test method TRFT to efficiently extract multi-point frequency characteristics of SISO systems is presented. This method can overcome some serious shortcomings from other existing test methods. Furthermore, on the basis of obtained multi-point frequency characteristics through TRFT, a frequency-domain identification algorithm is introduced to estimate the transfer function model. The simulations on two typical processes show excellent results and verify the validity of the identification method.