全液压矫直机液压伺服非线性系统稳定性研究

摘要

Full hydraulic leveler is widely used in industry at present,and it has such advantages as straightening force,high precision under with pressure,fast response and high level of automation and control. The valve control-ling cylinder is used to the hydraulic servo system. When the hydraulic cylinders are in the large stroke position,the open capacity of the unsymmetrical valve is also large. What is more,this system is a complex nonlinear system. This study proves that the hydraulic servo nonlinear system is stable by Liapunov theorem. Then the AMEsim soft-ware and the experiments were used to prove the stability of this system. The results shows that the application of valve controlling cylinder is feasible and provide the theoretical basis for the stability judgment on nonlinear sys-tem.%全液压矫直机具有矫直力大，辊缝位置精度高，系统响应速度快，自动化水平高的特点，广泛应用于中厚板轧钢生产线。液压伺服系统采用了阀控缸的方法，在矫直机液压缸大行程运行时非对称阀的开口量很大，四缸之间具有一定的位置关系，此时系统是复杂的耦合非线性系统。运用李亚普诺夫第二方法证明了该液压伺服非线性系统是稳定的，通过AMEsim仿真和从现场采集到的的实验数据验证了系统非线性时的稳定性，说明全液压矫直机采用非对称阀控非对称缸是合理的，同时也为今后在其他领域验证非线性系统的稳定性提供了有力的理论依据。