摘要
为了提高比例多路阀输出流量的稳定性,以负载敏感比例多路阀为研究对象,利用Stribeck模型分析了摩擦颤振补偿机理,采用功率键合图理论搭建了先导阀-主阀数学模型,利用该模型并结合对该模型的仿真获得了颤振信号作用下该阀的稳态特性,最后通过试验研究和功率谱分析验证了颤振信号对比例多路阀流量波动的影响规律。研究结果表明:比例多路阀的流量波动程度随颤振信号频率的增大而减小且减小幅度不断降低,随颤振信号振幅的增大而增大且两者近似呈线性关系;波动频率和颤振信号频率保持一致。可适度提高颤振信号的频率或降低其幅值,以提高比例多路阀输出流量稳定性,实现执行机构平稳运行。研究结果为比例多路阀的研究和性能优化提供了参考依据。
The study was conducted with the aim of improving the flow stability of a proportional multi-way valve. The valve＇ s friction compensation mechanism using flutter signals was analyzed based on the Stribeck Model, its pilot valve-main valve model was built mathematically by using the power bond graph theory, and with the model combined with the simulation of it, the steady-state characteristics of the valve under the action of chatter signals were obtained. Finally, the influences of chatter signals on proportional multi-way valves＇ flow fluctualion were verified by experimental study and power spectrum analysis. The simulation and the experiment show that the flow fluctua- tion amplitude of a proportional multi-way valve is proportional to the chatter signal amplitude, but decreases with the increase of the chatter signal frequency and the decreasing range is reduced quickly when the frequency is too large. Besides, the flow fluctuation and chatter signal have the same frequency. The results of the research verify that when both increasing frequency of chatter signal and reducing its amplitude reasonably can reduce the flow fluctuation.
出处
《高技术通讯》
CAS
CSCD
北大核心
2015年第6期631-638,共8页
Chinese High Technology Letters
基金
国家科技支撑计划(2014BAF02B01)
浙江大学流体动力与机电系统国家重点实验室开放基金课题(GZKF-201403)资助项目
关键词
比例多路阀
键合图理论
颤振信号
摩擦补偿
流量波动
proportional multi-way valve, power bond graph, chatter signal, friction compensation, flow fluctuation
