Hammerstein模型频域辨识方法研究

摘要

In this paper, a method is proposed to identify the nonlinear Hammerstein model with the input-output data in frequency domain. We can obtain the nonparametric model and not to estimate the parameters of the model with the noise corrupted output data. If the nonlinear model is known, the inverse of its can be done as a controller, we can make the nonlinear system to be a linear system to control. Parameters of the nonlinear block can be estimated by the proposed method, it can give a help to design a controller. The proposed method is proved to be feasible and effective by the simulation.%本文提出了一种在频域估计非线性Hammerstein模型的非线性部分的参数的方法。在随机噪声存在的情况下，通常利用频域的辨识方法，只能得到非参数的模型，不能估计出对应的参数。对于控制非线性Hammerstein模型，如果非线性部分的参数已知，控制器选取非线性部分的逆，能够使非线性系统控制变成线性系统进行控制。本文提出方法能够估计出非线性部分的参数，便于控制器的设计。通过仿真实验，证明该辨识方法是可行的，有效的。