为提高轧机液压压下厚度控制系统(H AGC)建模精度，考虑系统中伺服阀流量与阀口压力之间这一典型非线性关系，应用机理建模的方法建立了轧机液压压下系统的非线性动态仿真模型。研究结果表明：与线性模型相比该非线性模型更加贴近真实系统模型，可以更加准确、完善地反应各参数变化对系统输出的响应。利用该模型对各种典型故障进行模拟研究，可为系统的故障预测和诊断提供依据。实验研究证明了所建立的非线性模型的准确性和故障分析的合理性。
In order to improve the modeling accuracy of hydraulic gauge control system (HAGC),considering the typical nonlinear relationship between the servo valve flow and valve opening pressure,the nonlinear dynamic sim-ulation model of the mill gauge control system was established by using the method of mechanism modeling.The results show that the nonlinear model is closer to the true system model comparing with the linear model which can be more accurate and complete responding to change in the parameters of the system output.The model can pro-vide the basis for the fault prediction and diagnosis system by simulating various typical faults.And experimental research verify the correctness of the nonlinear model and reliability of the fault analysis.
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