摘要
针对比例阀性能测试要求,开发设计了一套基于CompactRIO测试系统,该系统自动化程度高,且具有高的测试效率与柔性;分析了其压力控制系统,因其为一随动系统,提出前馈补偿式压力闭环PID控制,试验结果证明该控制策略在不增加系统硬件成本基础上,提高了系统压力精度;在测试平台基础上开发了一套阀性能提升试验平台,分析了颤振信号对阀的滞环影响。理论分析与实验结果证明,过低的颤振频率将导致阀芯振荡,只有合适的幅值与频率对阀滞环才能起到减少作用。
Aiming at test requirement of proportional valve performance,a test system based on CompactRIO was developed. The system with high efficiency,test ability and flexibility was highly automated. The pressure control system was analyzed. Since it was a servo system,the strategy of pressure closed-loop PID control with feed-forward compensation was put forward. Test results show that the control strategy increases system pressure accuracy on basis of without increasing the cost of system hardware. Based on the test platform,a test platform of valve performance improvement was developed,and the effect of vibration signals on the valve with hysteresis was analyzed. The theoretical analysis and experiment results both show that when flutter frequency is excessively low,oscillatory valve may be resulted,and the hysteresis can be reduced only with appropriate amplitude and frequency.
出处
《机床与液压》
北大核心
2015年第5期44-48,4,共6页
Machine Tool & Hydraulics
基金
2012年度中央财政支持地方高校发展专项资金
福建省科技重大专项(2011HZ006-1)
福建省科技创新平台建设项目(2011H2008)
