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首页> 外文会议>2015 IEEE Advanced Information Technology, Electronic and Automation Control Conference >Coordination control for parallel actuation of hydraulic power assisted ball screw drive system
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Coordination control for parallel actuation of hydraulic power assisted ball screw drive system

机译：液压动力辅助滚珠丝杠驱动系统并联驱动的协调控制

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摘要

Hydraulic actuators are commonly incorporated into the vertical feed drive system of heavy duty machine tools to achieve higher load capacity and stiffness by balancing the moving load. In the linear motion control system with ball screw and cylinder driving in parallel, interactions between two drive sets are directly related with machining accuracy. On one hand, motion synchronization should be dealt with in term of master and slave scheme with hydraulic cylinder following the speed generated by screw nut real-timely. On the other hand, temperature rise due to heat generation of moving parts causes not only thermal expansion of the screw shaft but also property change of hydraulic oil, finally exerting a significant influence on the positioning accuracy. In this paper, the coupled model of this combination is built up to analyze the dynamic performance under different operating conditions. Based on the electromechanical system model with hydraulic dynamics and thermal dynamics, the problem is formulated as coordinating the velocity of two actuation systems with coupling. The hydraulic actuator is modeled as a combination of an ideal velocity source and a spring for modeling the compressibility effects of the fluid medium to address the coordination control issue. It is shown in the simulation results that the proposed control strategy can achieve desired coordination of different drive systems with acceptable tracking errors.
机译：液压致动器通常集成在重型机床的垂直进给驱动系统中，以通过平衡移动负载来实现更高的负载能力和刚度。在具有滚珠丝杠和气缸并行驱动的线性运动控制系统中，两个驱动装置之间的相互作用与加工精度直接相关。一方面，应根据螺母实时产生的速度，利用液压缸的主从方案处理运动同步。另一方面，由于运动部件的发热引起的温度上升不仅导致丝杠轴的热膨胀，而且导致液压油的特性变化，最终对定位精度产生重大影响。本文建立了这种组合的耦合模型，以分析不同工况下的动态性能。基于具有液压动力学和热动力学的机电系统模型，该问题被表述为协调两个带耦合的致动系统的速度。液压致动器被建模为理想速度源和弹簧的组合，用于对流体介质的可压缩性效应进行建模以解决协调控制问题。仿真结果表明，所提出的控制策略能够以可接受的跟踪误差实现不同驱动系统的期望协调。

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