大型回转装置电液位置伺服系统的降阶设计方法

Reduced order design method for electro hydraulic position servo system of a rotational equipments of large scale

液压位置伺服系统往往为高阶系统,因此在对其系统进行设计及性能优化过程往往会带来不便。针对某大型旋转装置的设计要求,通过对其位置伺服系统原理的分析,建立了系统传递函数模型,对其电液位置伺服系统进行了仿真计算,分析了系统的零极点分布情况,发现其非主导极点远离主导极点,由此通过使用降阶近似的方法,得出了其近似二阶系统模型。仿真分析结果表明,该近似二阶系统与原系统的时间响应具有较好的吻合性。在此基础上,针对二阶近似系统提出了相应的校正方法,在系统的前向通道中串入校正环节,该校正环节能使系统闭环传递函数的一个零点与一个极点相互抵消,形成临界阻尼二阶系统,据此计算了校正环节的具体参数,从而在保证系统不超调情况下具有良好快速响应性能。研究结果表明,所设计的系统能较好地满足设计要求。

Hydraulic position servo systems are usually high order systems,which lead to some inconvenient for its design and optimization.Aiming at the require of some rotational equipment of large scale,the transform function of the system was built,and the distribution of poles and zeros was analyzed,which lead to the result that the non-dominant poles were remotely distributed to the dominant poles.Based on the works of above,a reduced order method was presented to obtain the second order approximation of the system.The simulation indicates that the time response of the approximated second order system coincides with the original system well.The calibration method was presented,in which the calibration component was added to the forward path of the system.A pole and a zero of the calibrated system could be counteracted.Based on this,the parameters of this calibration component were calculated,which could ensure system no overshoot and rapid response.The simulation results indicate a good coincidence with the design requirement of the system.