【作者】 杜经民； 向超； 傅晓云； 李宝仁；

【Author】 Du Jingmin Xiang Chao Fu Xiaoyun Li Baoren (FESTO Pneumatic Centered, Huazhong University of Science and Technology, Wuhan 430074)

【机构】 华中科技大学FESTO气动中心；

【摘要】 本文以高精度气体压力模拟器为研究背景,针对高压气体压力伺服控制这一难题,提出了一种间接控制方案。阐述了双活塞缸式气动高压发生系统的工作原理;讨论了相关参数对系统动态性能的影响;提出将系统非线性特性抽象成指对数关系式并作为控制量输入的一种简单而有效的控制方法。仿真和实验结果表明,采用间接控制可以产生近4Mpa的气压信号,系统跟踪幅值为50kPa、频率为1Hz的正弦信号,其幅值误差小于10%、相位滞后小于10度;系统的稳态误差小于0.1%FS。更多还原

【Abstract】 In this paper, according to the special requirement of the pressure simulator, a theory of indirect control is proposed to overcome the disadvantages with the extra-high pressure. The structure and principle of the high-pressure signal generating system with two cylinders is presented. The main parameters that influence the static and dynamic performances are emphatically analyzed by digital simulation. The nonlinearity of the pneumatic system is overcome by preprocessing the value of feedback through logarithmic transformation. The effectiveness of the proposed theory is verified by experimental data. In the pressure scope of 800kPa to 3800kPa, tracing the sinusoidal signal whose amplitude is 50kPa and frequency is 1Hz, the errors of amplitude is less than 10%, the lag in phase is less than 10 °.更多还原