Abstract:

Based on a closed-type liquid hydrostatic slide adjusted by the flow control valve,the kinematics equations and the flow equations of the hydrostatic slide system were established separately.The defferential equations on the external load and the oil film thickness,the oil pocket pressure were linearized,and the system transfer function via Laplace transform was obtained.The mathematical expression on the dynamic performance of the slide was presented.Based on the field debugging,taking the dynamic viscosity of the hydraulic oil and the initial opening of the flow control valve for an example,the curves on the oil film thickness and the dynamic viscosity,the oil pocket pressure and the initial opening were plotted,and the amplitude—frequency and phase—frequency characteristics were analyzed.The proposed research analyzes the influences on the dynamic viscosity and the initial opening of the dynamic performance in the time and frequency domain,and provides a theoretical basis for the project debugging.

Key words: flow control , valve;closed-type hydrostatic slide;nonlinear differential equation;dynamic characteristics

摘要：

以流量控制阀调节下的闭式液体静压导轨为对象，建立了导轨系统的运动学方程和流量方程，推导并线性化处理了外载荷与油膜厚度、油腔压力的微分方程组，利用Laplace变换获得了传递函数，推导了导轨动态性能的数学表达式。以现场调试为基础，绘制了油膜厚度与动力黏度、油腔压力与初始开口度的关系曲线，分析了系统的幅频、相频特性。分析了动力黏度、初始开口度对时域、频域内导轨动态性能的影响,研究结果可为工程调试提供理论基础。

关键词: 流量控制阀, 闭式静压导轨, 非线性微分方程, 动态特性