摘要
外负载冲击对液压油缸管路系统造成较大的压力振荡脉动,管路密封、连接等受到不利影响。将液压油缸管路系统动力学方程中的参数转换成液容、液感、液阻3项,以“基尔霍夫电压/电流定律”为基础,与电路类比后建立起液压油缸管路系统的电路化模拟等效回路,通过仿真分析,得到各参数的动态响应及相互关联关系。结果表明:液容和液感均会产生较大幅值的压力振荡脉动,但两者的综合作用呈现较小幅值的压力振荡脉动,证明了液容与液感间发生了较大的能量互换,压力振荡脉动主要由液容和液感产生。为控制压力振荡脉动,需使油缸管路参数响应的频率与外负载的共振频率相同,并推导出外负载阻尼比ζ=1时,可使整个液压油缸管路系统具备调节时间和上升时间较适宜的控制性能,压力振荡脉动的频率接近零。研究结果可为液压油缸管路系统压力振荡脉动的控制及管路设计提供理论依据。
The impact of external load causes large pressure pulsation on the hydraulic cylinder pipeline system(HCPS),the sealing and connection of HCPS are adversely affected.Converting the parameters in the dynamic equation of the HCPS into hydraulic volume,hydraulic inertia and hydraulic resistance,based on“Kirchhoff’s voltage/current law”,a circuit model of HCPS was established.Then the dynamic response and correlation of each parameter were obtained by simulation.The results show that both hydraulic volume and hydraulic inertia produce large pressure pulsation,but the combined effect presents a smaller amplitude response,which proves energy exchanging between hydraulic volume and hydraulic inertia.Besides,pulsation is mainly produced by hydraulic volume and hydraulic inertia.In order to control the pulsation,the frequency of the pipeline needs to be the same as the frequency of the external load,and the external load damping ratioζ=1 can be deduced so that the entire HCPS has a more appropriate adjustment time and rise time for better control performance,and the pressure frequency is close to zero.The results can provide a theoretical basis for the control of pressure pulsation of HCPS and hydraulic pipeline design.
作者
秦磊
吴仁智
QIN Lei;WU Renzhi(School of Mechanical Engineering,Tongji University,Shanghai 201804,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2021年第8期246-256,共11页
Journal of Chongqing University of Technology：Natural Science
关键词
液压油缸
液压管路
电路
压力振荡脉动
控制
hydraulic cylinder
hydraulic pipeline
circuit
pressure pulsation
control
