带有高增益观测器的MDF连续热压系统滑模控制

Sliding Mode Control for MDF Continuous Hot-press System with High Gain Observer

中密度纤维板(Medium Density Fiberboard,MDF)作为木材综合利用率高的一种人造板材,其厚度精度决定了板材的力学性能,从而影响其质量。本文将连续热压机电液位置伺服系统作为被控对象,针对MDF板坯厚度控制问题,提出一种带高增益观测器的滑模控制策略。首先通过设计高增益观测器对系统输出的位置信号进行观测,将位置、速度及加速度信号的估计值返回滑模控制器,实现了无需速度、加速度测量的滑模控制,保证了观测误差一致最终有界。然后通过构造合适的Lyapunov函数,证明了所提出的控制策略不但能使系统指数渐近稳定,而且保证了跟踪误差的一致最终有界性。仿真实验结果表明,所提出的控制方法可以保证系统精准快速地跟踪位置信号,从而可以保证MDF获得良好的厚度精度。

Medium Density Fiberboard(MDF)is a kind of artificial board with high comprehensive utilization ratio of wood.Its thickness and precision determine the mechanical properties of the board,thus affecting its quality.In this paper,the continuous hot pressing electro-hydraulic position servo system is taken as the controlled object.Aiming at the problem of MDF slab thickness control,a sliding mode control strategy with high gain observer is proposed.A high gain observer is designed to observe the output position signal of the system,and the estimation of the position,velocity and acceleration signals is returned to the sliding mode controller.The sliding mode control without speed and acceleration measurement is realized,which ensures that the observation error is consistent.Then,by constructing the proper Lyapunov function,it is proved that the proposed control strategy can not only guarantee the exponential asymptotic stability of the system,but also guarantee the consistent boundness of the tracking error.The simulation results show that the proposed control method can ensure that the system can track the position signal accurately and quickly,which can ensure the MDF has good thickness and precision.