电子万能材料试验机锁相——自适应控制

Phase Lock and Adptive Control Of Electronic Universal Material Testing Machine

本文对电子万能试验机控制系统进行了综合分析、设计和实现，并将全系统分为三环（内、中、外环），由内向外逐层实施。其中内环为直流伺服单元，该环主要提供功率驱动和良好的动静态性能，中环为模数混合锁相系统，期望利用锁相技术的高稳态精度达到设计要求。外环针对试件的差异以及在拉压时的非线性，引入实时递推辩识和自校正控制，该控制器为新型的跟踪任意给定输入零极点配置自校正方案，与常规的零极点配置方法相比，具有好的跟踪性能和减小输出抖动的能力。仿真结果验证了这种方法的有效性。

A control system of electronic universal testing machine is analized,designed and presented in this paper. The whole system is seperated into three parts:inner loop,middle loop and outer loop,among which inner loop means DC motor serve system,mainly provides power drive and good dynamic and static response performance;middle loop is MPLL,a higher stability accuracy fitting for the design demands is expected;and to direct against the variety experimental material and its nonlinear property during testing period,the realtime recursive identification and self tuning control are incorporated into outer loop. A novel zero pole placement self tuning controller to trace given inputs is discussed in the design.Simmulation results testify it has better performance than traditional zero pole placement self tuning controller when it is tracking input and when systems parameters are changed.