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| Mechanism analysis, simulation and experiment study of dynamic servo control system of periodic high pressure impact |
| ZHANG Bin, DENG Qian-kun, WANG Shuang, YANG Hua-yong |
| The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027 |
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Abstract The cylinder and servo-valve applied to airplane hydraulic systems should be subject to periodic trapezoid-shaped pressure impact test treated as a closed chamber. A hydraulic servo control system dynamically tracking the standard impact pressure curve was developed for the test. Mathematic models of the two stage servo-valve and the being tested chamber was established, and the simulation in AMESim was accomplished using the digital PID algorithm. The flow rate and valve open area under different chamber volume and different impact frequency was studied. Maximum flow rate of the servo valve in simulation is about 250 L/min under the condition of 5-42 MPa impact pressure, 6 L chamber volume and 2 Hz impact frequency. Experiment system could be visually real-time controlled based on the LabVIEW and data acquisition card using graphic coding technology. Actual pressure curve generated by the hydraulic servo control system precisely falls into the standard area. Experiment results tally with the simulation and the system reaches the design target.
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Published: 01 February 2015
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压力脉冲试验伺服控制系统机理分析与仿真试验
为实现压力脉冲试验中标准压力波形的精确动态跟踪控制,满足高压力高频率持续冲击的要求,建立该试验的液压伺服系统与测控平台.将飞机用作动筒和伺服阀等被试液压件处理为封闭容腔,利用油液压缩性进行建压,采用LabVIEW图形化编程技术完成了液压系统的可视化动态伺服控制.在建立伺服阀、被试容腔和蓄能器数学模型的基础上,结合数字PID控制算法,完成AMESim环境下的仿真,对比分析不同容腔容积和冲击频率对系统性能的影响,得到不同条件下系统流量和阀口开度等参数的理论值,仿真结果表明伺服阀需要有额定200 L/min以上的通流能力.实际试验系统以压力等级50 MPa,通流能力230 L/min的大流量伺服阀为直接控制对象,试验高压达到50 MPa,并可无级调整,压力冲击波形周期2 Hz、区间5~42 MPa,试验曲线落在标准阴影区以内,试验结果符合预期指标,并验证了仿真分析的可靠性.
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