液压升降装置机液伺服系统响应特性分析

本文针对大惯量、大功率特性的液压升降装置起动时，存在快速响应和稳定性较难兼顾的突出问题，分析了阀控柱塞缸特性及机液伺服系统原理，建立了机液伺服系统的控制数学模型，运用经典控制理论分析方法，得出系统开环、闭环传递函数，并在时域内开展了阶跃信号输入下的系统响应特性分析，明确了影响系统性能的参数设计原则，为实际工程设计提供理论依据。

Analysis on Response Characteristics of Mechanical Hydraulic Servo System of Hydraulic Lifting Device

In order to solve the remarkable problem of keeping balance between quick response and stability during the start of the hydraulic lifting device which has characteristics of big-inertia and high-power. The property of valve-controlled piston cylinder and the principle of mechanical hydraulic servo system are analyzed in this paper. Base on the mathematics modeling of mechanical hydraulic servo system, open-loop and closed-loop transfer functions are obtained by the analysis method of classical control theory. Meanwhile, it analyzes the system response characteristics based on step response in time domain. The principle of parameters design influence on system performance is certain in this paper. It can also provide theoretical support in practical engineering.