基于挤压油膜理论的二维电液压力伺服阀稳定性分析

摘要/Abstract

摘要： 针对飞机液压刹车系统，设计了一种2D电液压力伺服阀，以2D伺服螺旋机构为导阀，通过弹簧与主阀联动，采用直线位移传感器形成闭环位置反馈，精确控制出口压力；基于挤压油膜理论设计阀体结构，增大系统阻尼比，提高系统稳定性；在建立阀和油膜缓冲数学模型的基础上，仿真分析了主阀正开口量与弹簧变形量和主阀输出压力之间的关系，确保该阀具有良好的电流-压力特性；对初始系统、减小开环放大系数和增大系统阻尼比三种情况进行了稳定性仿真分析，验证了引入油膜阻尼缓冲设计的必要性。

关键词: 挤压油膜, 压力伺服, 直线位移传感器, 阻尼比, 稳定性

Abstract: A new kind of 2D electro-hydraulic pressure servo valve (EPSV) was designed for aircraft hydraulic braking system herein. Using LVDT to form a closed loop position feedback, servo spiral mechanism was taken as pilot valve, the pressures were accurately controlled through mutual movements among 2D pilot valve, spring and master valve. Based on the squeeze oil film theory, the valve structures were designed to increase the system damping ratio and improve system stability. A mathematical model of the valve and the squeeze oil film theory were built, the relationship among positive opening amounts of the master valve, spring deflections and the output pressures of master valve was simulated to ensure its current-pressure characteristics. Three kinds of conditions, initial system, decreasing open loop gains and increasing system damping ratios, were comparatively analyzed by software MATLAB, simulation results show that: it is necessary to design the valve based on the squeeze oil film theory, the valves stability is improved much after increasing its damping ratios.

Key words: squeeze oil film, pressure servo, linear variable differential transformer(LVDT), damping ratio, stability

中图分类号:

TP271

左希庆, , 阮健, 孙坚, 李胜, 刘国文. 基于挤压油膜理论的二维电液压力伺服阀稳定性分析[J]. 中国机械工程.

ZUO Xiqing , RUAN Jian, SUN Jian, LI Sheng, LIU Guowen. Stability Analysis of 2D Electro-hydraulic Pressure Servo Valve Based on Squeeze Oil Film Theory[J]. China Mechanical Engineering.

参考文献

[1]王永熙. 飞机飞行控制液压伺服作动器[M].北京：航空工业出版社，2014: 6-9.
WANG Yongxi.Hydraulic Servo Actuator for Aircraft Flight Control [M]. Beijing: Aviation Industry Press,2014:6-9.
[2]黄澄，焦宗夏，尚耀星. 考虑管路的飞机液压刹车系统压力振荡分析[J]. 北京航空航天大学学报, 2014,40(2):210-215.
HUANG Cheng, JIAO Zongxia, SHANG Yaoxing. Pressure Oscillation Analysis of Aircraft Hydraulic Braking System Considering Pipeline[J].Journal of Beijing University of Aeronautics and Astronautics, 2014,40(2):210-215.
[3]ZHANG Ming, NIE Hong, WEI Xiaohui, et al. Research on Modeling and Simulation for Aircraft Anti-skid Braking[C]//2nd International Symposium on Systems and Control in Aerospace and Astronautics. Piscataway,NJ:IEEE Computer Society,2008:1-5.
[4]WEI Jianhua, KONG Xiaowu,QIU Minxiu, et al. Transient Response of a Valve Control Hydraulic System with Long Pipes[J].Chinese Journal of Mechanical Engineering: English Edition, 2004,17(1):31-35.
[5]路甬祥. 液压气动技术手册[M].北京：机械工业出版社，2002:1102-1108.
LU Yongxiang. Technological Manual of Hydraulic and Pneumatic[M]. Beijing: China Machine Press, 2002:1102-1108.

[6]王春行. 液压控制系统[M].北京：机械工业出版社，2011:116-120.
WANG Chunxing. Hydraulic Control System[M]. Beijing: China Machine Press,2011:116-120.
[7]田源道. 电液伺服阀技术[M].北京：航空工业出版社，2008.
TIAN Yuandao. Technology of Electro-hydraulic Servo Valves [M]. Beijing: Aviation Industry Press,2008.

[8]许耀铭. 油膜理论与液压泵和马达的摩擦副设计 [M].北京：机械工业出版社，1987:356-359.
XU Yaoming.Oil Film Theory and Friction Pair Designing for Hydraulic Pump and Motor [M]. Beijing: China Machine Press, 1987:356-359.
[9]夏胜枝，欧阳明高，周明,等. 高速强力电磁阀挤压油膜阻尼的研究[J].机械工程学报，2003,39(7):84-88.
XIA Shengzhi, OUYANG Minggao, ZHOU Ming, et al. Analysis of Squeeze Film for High-Speed and Powerful Solenoid Valve [J]. Chinese Journal of Mechanical Engineering,2003, 39(7):84-88.
[10]RUAN J, UKRAINETZ P, BURTON R. Frequency Domain Modeling and Identification of 2D Digital Servo Valve [J]. International Journal of Fluid Power, 2000, 1(2): 76-85.
[11]LI Sheng, RUAN Jian, BURTON R, et al. 2D Simplified Servo Valve[J]. Chinese Journal of Mechanical Engineering,2003,16(2):132-135.
[12]阮健. 电液直接数字控制[M]. 杭州: 浙江大学出版社, 2000:278-280.
RUAN Jian. Directly Digital Control for Electro-hydraulic[M]. Hangzhou: Zhejiang University Press, 2000:278-280.
[13]李胜,阮健,孟彬. 2D 数字阀滞环颤振补偿技术研究[J]. 农业机械学报, 2011,42(3):208-212,218.
LI Sheng, RUAN Jian, MENG Bin. Dither Compensation Technology for Hysteresis of 2D Digital Valve [J]. Transactions of the Chinese Society for Agricultural Machinery. 2011,42(3):208-212,218.
[14]宋志安，曹连民，黄靖,等. MATLAB/Simulink与液压控制系统仿真[M].2版. 北京：国防工业出版社，2012:176-179.
SONG Zhian, CAO Lianmin, HUANG Jing.MATLAB/Simulink and System Simulation for Hydraulic[M]. 2nd ed. Beijing: National Defense Industry Press, 2012:176-179.
[15]韩占忠，王敬，兰小平. FLUENT流体工程仿真计算实例与应用[M].北京：北京理工大学出版社，2008:212-218.
HAN Zhanzhong, WANG Jing, LAN Xiaoping. FLUENT Simulation Instance and Application for Fluid Engineering [M]. Beijing:Beijing Institute of Technology Press, 2008:212-218.