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一、前言在液压控制系统中,经常由于阻尼系数较小而造成低阻尼振荡,这就使系统的工作不可靠。在液压系统中,增加阻尼的方法比较多,这里介绍一个用压力反馈增大系统阻尼的方法。本文所介绍的系统是一个由电液伺服阀控制液压伺服马达的系统,见图1所示。对该系统的刚度已在“电液伺服马达的伺服刚度分析”一文作了较系统的分析,其动态特性也已在“液压伺服马达的分析”一文中分析过了。这里分析一下对该系统采用压力(静压和动压)反馈后对系统的伺服刚度和动态特性的影响。
I. INTRODUCTION In hydraulic control systems, low damping oscillations are often caused by small damping coefficients, which makes the system unreliable. In the hydraulic system, there are more ways to increase the damping. Here we introduce a method to increase the system damping by pressure feedback. The system introduced in this paper is a system of hydraulic servomotors controlled by electro-hydraulic servo valves, as shown in Fig.1. The stiffness of this system has been analyzed systematically in “Servo Stiffness Analysis of Electrohydraulic Servo Motor” and its dynamic characteristics have also been analyzed in “Analysis of Hydraulic Servo Motor”. Here to analyze the system after the pressure (hydrostatic and dynamic pressure) feedback on the system’s servo stiffness and dynamic characteristics.