采煤机滚筒调高系统建模及仿真

摘要

In order to improve dynamic performance and tracking reliability of drum height adjusting system of shearer,mathematical models of drum height and hydraulic cylinder displacement were established by analyzing work principle of the drum height adjusting system and relationship of geometric parameters of hydraulic mechanism.Combining fuzzy adaptive PID controller,simulation models of open loop controlled and closed loop controlled drum height adjusting systems based on electric-hydraulic proportional direction valve controlling hydraulic cylinder were established in Automation Studio software.Speed response and location tracking characteristics of the systems were studied under no-load and load conditions separately.The simulation results show that the systems have fast response speed and better goodness of fit of drum location tracking,and performance of the closed loop controlled drum height adjusting system is better than the open loop controlled one.%为提高采煤机滚筒调高系统的动态特性及跟踪可靠性,通过分析滚筒调高系统工作原理及液压机构几何参数对应关系,建立了滚筒高度与液压缸行程数学模型;结合模糊自适应PID控制器,在AutomationStudio软件环境下建立了电液比例换向阀控液压缸开环和闭环控制滚筒调高系统仿真模型,研究了空载和负载情况下系统的速度响应及位置跟踪特性,结果表明提出的滚筒调高系统响应速度快,对滚筒位置跟踪的吻合度较好,且闭环控制滚筒调高系统优于开环控制滚筒调高系统.