温度对矢量喷管电液伺服系统影响研究

Effects of Temperature on Vectoring Nozzle Electro-Hydraulic Servo System

关键词:  温度  电液伺服系统  矢量喷管  AMESim  控制特性

Key words:  Temperature  Electro-hydraulic servo system  Vectoring nozzle  AMESim  Control characteristic

摘要:

为研究液压油温度变化对矢量喷管电液伺服机构控制特性的影响，理论推导建立其数学模型，并利用AMESim软件搭建系统物理模型进行仿真计算。采用控制变量法，分组设置不同温度下的油液黏度参数，将批处理得到的结果对比分析。研究表明:随着温度升高，系统阶跃响应加快，滞环减小，线性度改善，频带宽度也增大；与此同时，阶跃响应的调节时间和超调量均增加，使喷管振动加剧。此外温度升高引起的油液黏度降低导致伺服阀的内泄漏快速增加，其中50℃时的泄漏量已是-20℃时的3倍，泄漏量增加将降低整个系统的效能。在仿真的基础上，依托“液压伺服控制实验测试平台”开展试验验证，两者结果基本一致，证明了仿真结论的正确性。

Abstract:

In order to study the effects of temperature variation of hydraulic oil on the control characteristics of vectoring nozzle electro-hydraulic servo mechanism， the mathematical model was built and the physical model constructed by AMESim was used to simulate the mechanism.By using control variable method， oil viscosity parameters corresponding to different temperatures were set.Then comparing and analyzing the results obtained by batch process， the consequences show that the speed of step response of system is accelerated when the temperature rises.At the same time， the hysteresis loop decreases， the linearity improves and the bandwidth increases.However， with the temperature rising， the adjusting time and overshoot volume all increase and the consequence is that the vibration of nozzle become severer.In addition， the decreasing of oil viscosity caused by rising temperature led to quick increase in leakage of servo valve and the leakage at 50℃ is three times as much as that one at -20℃.As the leakage increases， the efficiency of system decline.Depending on the simulation， experiment based on ‘Experiment test platform of hydraulic servo control system’ was done.The results of experiments are similar to that of simulation.Therefore， the correctness of the conclusion summarized from simulation is proved.