Multi-Channel Force Control System for Static Loading

An eight-channel force loading system is presented, which adopts position control system and force control system switching model, small flow servo valve controlled capacious cylinder system scheme, intelligent PID algorithm and distributed load approach. Through the analyses of the equivalent model of valve controlled cylinder force subsystem, a controller based on intelligent PID algorithm is designed, which is not sensitive to the variation of parameters such as environmental stiffness. According to the coupling of multiple load channels, a distributed load approach is employed in the superior monitor computer. Experimental results show that the system designed has high precision and robustness.

基于改进的非线性自抗扰算法的电液伺服力加载控制

针对起落架作动筒磨合与寿命实验台阀控缸力加载系统瞬态和动态加载精度较低,不能满足载荷谱精度要求从而影响作动筒安全性与可靠性判断的问题,从控制算法出发,提出一种具有更高精度及抗干扰能力的改进非线性自抗扰控制算法(Improved nonlinear active disturbance rejection control,INADRC)。首先,建立电液伺服力加载系统AMESim/Simulink联合仿真模型。其次,设计INADRC控制器并使用遗传粒子群算法对其参数寻优。最后,通过对3种目标跟踪信号仿真和实验来验证控制器性能。仿真及实验结果表明,改进非线性自抗扰控制相比于PID控制、非线性自抗扰控制和其他改进非线性自抗扰控制,平均精度分别提升了4.15%,1.15%和0.65%,体现出伺服力瞬态和动态加载精度高、抗干扰能力强的特点。