【摘要】 自行设计了一种超高压气动比例减压阀,该阀的先导气流引自主阀的进气口,流经压力调节腔排入主阀的排气口;以比例电磁铁作为先导级控制元件,采用电反馈闭环控制,输出压力在8～25MPa连续可调.通过建立系统的非线性数学模型,分析减压阀的动态特性及结构参数、控制器参数的影响,并利用Matlab进行了仿真.结果表明,该阀在设计压力范围内具有较好的压力特性;PI参数固定的控制器不能同时较好地满足阀在较高和较低输出压力下的控制要求;调压腔的体积是影响阀动态特性的重要因素,增大调压腔的体积是减小输出压力振动幅度、提高输出压力精度最为有效的方法.更多还原

【Abstract】 A new type pneumatic proportional extra-high pressure valve was developed. In this valve, pilot air is led out from the main valve’s inlet, passes through pressure regulating chamber, then drains into the main valve’s exhaust chamber. A proportional electro-magnet was used as pilot control component, and the control strategy used electric closed-loop feedback. The useful output pressure range is 8—25 MPa. A nonlinear mathematical model of the valve was established for analyzing the effects of the structural parameters and controller parameters on the valve’s dynamic characteristics. The valve worked well under the designed pressure. Fixed parameters of the PI controller cannot meet the needs of control for both high output pressure and low output pressure. The regulating chamber volume has the most important influence on the valve’s dynamic characteristics, and increasing the regulating chamber volume is the most effective solution to reduce the vibration amplitude of output pressure and improve the output pressure accuracy.更多还原