多缸并行驱动液压系统建模与动态特性分析  

Modeling and Analysis of Dynamic Characteristics for Multi- cylinder Hydraulic Parallel Drive System

作　　者：潘晴[1] 黄明辉[1] 李毅波[1] 陈敏[1] 罗国平[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《四川大学学报（工程科学版）》2014年第1期193-199,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51005251);国家"973"重点基础研究发展计划资助项目(2011CB706802);金属挤压/锻造装备技术国家重点实验室开放基金资助项目;湖南省博士生科研创新项目

摘　　要：为揭示多缸并行驱动液压系统多参数耦合作用规律,采用解析法建立了液压机驱动系统动态数学模型。利用变步长Runge-Kutta法探讨了粘性阻尼系数、油液有效弹性模量、管道内径、运动部件质量以及负载刚度等参数对驱动系统动态特性的影响规律。结果表明:粘性阻尼系数增大或减小运动部件质量使系统瞬态振荡幅度减弱;油液有效弹性模量增大或管道内径减小,系统响应速度加快;随着负载刚度增大,主缸稳定压力值增大,开环系统稳态误差增大。液压机在快降过程中不宜采取主动同步控制方式;液压机空载或工件处于塑性变形阶段应重点关注系统稳定性,而工件处于弹性变形阶段时,则应着重提高系统的跟踪精度。研究结果可为液压机驱动系统设计和参数选择提供理论依据。In order to investigate the effects of multiple coupling parameters on multi-cylinder hydraulic parallel drive system, a dynamic mathematic model of drive system for hydraulic press was established based on analytic methodology. The influences of system parame- ters of viscous damping coefficient, elastic modulus, mass of moving beam, and load stiffness on dynamic behaviors of hydraulic drive system were studied using variable step length Runge-Kutta method. Results showed that the magnitude of transient oscillation is dimin- ished by increasing viscous damping coefficient or decreasing mass of moving beam. System dynamic response can be accelerated pro- vided that the elastic modulus is increased or the pipe diameter is decreased. The pressure of major cylinder and system steady-state er- ror rise with the increase of load stiffness. Furthermore, active synchronization control is not recommended when the machine is in fast approaching period. The stability of the system must be emphasized if the hydraulic press is driven under on-load or the forged piece is in plastic deformation stage, while tracking accuracy is a key issue when the workpiece is under elastic stage. The research results could provide theoretical basis for the design of system and parameter selection.

关 键 词：动态响应 仿真 数学模型 液压机 驱动系统 

分 类 号：TH137[机械工程—机械制造及自动化] TG315[金属学及工艺—金属压力加工]