带钢纠偏电液伺服系统的滑模变结构控制研究

Research on Sliding Mode Variable Structure Control for Strip Steel Rectifying Electro-hydraulic Servo System

在带钢的生产处理线上,由于各种各样的原因从而导致的带钢跑偏现象难以避免,为了不影响带钢生产处理的连续性,设计一套完整的带钢纠偏系统便显得非常重要。由于生产处理线属于大负载场合,需要大功率的电液伺服系统驱动,而液压系统复杂的非线性特点给系统的控制带来非常大的困难。本文首先阐述带钢纠偏的原理以及分析并建立带钢纠偏液压伺服系统的数学模型;其次针对电液伺服系统的参数不确定性以及非线性等特点,设计基于指数趋近律的滑模变结构控制算法;最后通过Matlab/Simulink仿真,验证了滑模变结构算法在带钢纠偏电液伺服系统中的可行性,以及相对于传统的PID算法,其具有较好的动态性能和较强的鲁棒性。

In the production lime of strip steel,it is difficult to avoid stripstel be out of line,due to various reasons.In order not to affect the continuity of strip steel production and processing,it is very important to design a strip steel rectifying control system.As the production line belongs to the situaion of large load,it needs a high-power electro-bydraulic servo system to drive it,and the complex nonlinear characteristics of the byraulic system bring great difficulty to the system.Firstly,Thisthesis,describes the principle of strip steel rectifying control system and thehydraulic servo system mathematical model.Secondly.design the sliding mode variable structure control algorithm based on the exponential approach law,asthe parameter uncertainty and nonlinearity of the eletro-bydraulic servo system.Finally,through Malab/Simulink simulation,the feasibility of the sliding mode variable structure algorithm in the ectro-bydraulic servo system for strip steel guiding is proved,and compared with the traditional PID algorithm,it has better dynamic performance and stronger robustness.