摘要
为了提高阀控负载敏感系统的控制精度,采用伺服电机与变量泵构建泵源,实现对液压泵转速与流量的同步调节,提升系统的稳定性。在给出负载敏感系统数学模型和位置环控制方法的基础上,对负载敏感系统特性进行分析。利用AMESim建立了以转速调节方式实现的负载敏感系统仿真模型,验证了控制方法的准确性。研究结果表明:在泵控子系统内设置流量前馈后,能够有效地降低节流口的压降波动性。在存在流量前馈的条件下,系统的跟踪误差降低,可见设置流量前馈后能够降低节流口的压差波动,使系统达到更高的位置跟踪精度。系统节流口压降达到了与压力指令相近的状态,总体表现为节流口压降增大后,位置误差减小。随着压差指令的下降,系统获得了更高的能效。
In order to improve the control accuracy of valve-controlled load sensitive system, the servo motor and variable pump were used to build the pump source to realize the synchronous adjustment of rotating speed and flow of hydraulic pump, and the stability of system was improved, and based on the mathematical model of load sensitive system and the control method of position loop, the characteristics of load sensitive system were analyzed. Then, by adjusting rotating speed method, the simulation model of load sensitive system was established by AMESim, and the accuracy of the control method was verified. The results show that the pressure drop fluctuation can be reduced effectively by setting the flow feedforward in the pump control subsystem. Under the condition of flow feedforward, the tracking error of the system is reduced. It can be seen that the setting of flow feedforward can reduce the pressure difference fluctuation at the throttle orifice and make the system achieve higher position tracking accuracy. The pressure drop at the throttle orifice of the system reaches a state close to the pressure instruction. As a whole, the position error decreases with the increasing of pressure drop at the throttle orifice. Thus, as the pressure difference instruction decreases, the system gains higher energy efficiency.
作者
牛瑞利
邱益
王博
Niu Ruili;Qiu Yi;Wang Bo(Department of Mechanical and Electrical Engineering,Zhengzhou Institute of Industrial Application Technology,Zhengzhou 451100,China;Department of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 451001,China;Henan Zhongyuan Heavy Forging&Stamping Co.,Ltd.,Zhengzhou 451100,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2022年第4期195-199,共5页
Forging & Stamping Technology
基金
河南省重点研发与推广科技攻关项目(192102210224)。
关键词
液压系统
阀控
负载敏感系统
流量前馈
压降分析
hydraulic system
valve control
load sensitive system
flow feedforward
pressure drop analysis
