基于软件计算的流量反馈液压电梯速度控制系统的研究

【作者】 陈娟；

【导师】 杨华勇；

【作者基本信息】 浙江大学 ， 机械电子控制工程， 2003， 硕士

【摘要】 本论文进行基于软件计算的流量反馈液压电梯速度控制系统的研究。主要针对软件计算流量反馈这种新型的流量控制技术，研究其在液压电梯控制领域中应用。通过建模仿真和模拟负载实验，分析了电梯液压系统的稳态和动态性能，讨论了系统流量的软件计算反馈方法及其影响因素。 论文共分五部分介绍了课题的研究工作： 论文第一章根据大量的文献资料和市场现状，分析了液压电梯行业的形势和发展趋势；具体介绍了与液压电梯相关的液压动力系统的流量控制技术的发展和各项技术的应用特点。最后提出了本课题的研究意义、研究内容和难点。 第二章从系统的运行过程和系统的控制过程两个角度介绍了基于软件计算的流量反馈控制液压电梯的工作原理。建立系统的仿真模型，对系统中影响流量计算的部分参数和物理量进行建模仿真，提出处理方法；详细分析了基于软件计算的流量反馈液压电梯系统的各个环节，逐一建立稳态和动态数学模型和Simulink仿真模型。 第三章通过稳态和动态模型的仿真，研究了液压电梯系统在开环状态下的性能。在稳态模型仿真中详细分析了液阻、主阀和先导阀弹簧刚度、阀口形式、负载压力等系统的参数和物理量的变化对系统的稳态性能的影响，动态模型仿真中主要分析了系统的动态响应特性及其影响因素。 第四章进行了液压电梯系统的闭环仿真，对比分析了软件计算流量反馈控制和轿厢速度大闭环反馈控制的仿真结果。对液压电梯系统进行实验研究，讨论了以测试比例流量阀性能为目的的轿厢速度大闭环实验结果。进行模拟负载台架实验，分析软件计算流量反馈的实验结果，讨论原因。 第五章对已经进行的软件计算的流量反馈液压电梯控制系统的研究工作进行总结，对今后的研究给出了建议。 综观全文，论文对软件计算的流量反馈液压电梯控制系统进行了细致地研究，仿真和实验研究获得了一些很有价值的研究成果，为进一步的研究工作打下了良好的基础。更多还原

【Abstract】 The speed control system of hydraulic elevator using computational methods for flow rate feedback is discussed in this thesis. It’s the application of a new flow feedback control method in hydraulic elevator, a typical electro-hydraulic system. Through modeling, simulation and simulative load experiments, the static and dynamic performance of the hydraulic system is investigated. And the emphasis is on the conversion algorithm of flow in this system, on which the facts that have effect are analyzed.There are five chapters in this thesis:The first chapter in this thesis generally introduces the development of hydraulic elevators based on relevant publications search and market investigation. Then the specialties of the hydraulic products which have used different kinds of flow control technology are described. At last, the project significance, main research contents and the difficulties of this project are provided.In the second chapter, the working principles of the project are analyzed, including the running process and the control process. Models of some parameters which have effect on the flow computation have been established. The static and dynamic mathematical models and the Simulink models of the integrated control valve and the whole system are derived.The third chapter gives the results of static and dynamic open loop simulation. In static simulation, the focus is on the static regulation range and dead-zone. The effect of the variable system parameters, such as hydraulic resistances, springs in main valve and pilot valve, spool and load, are discussed. In dynamic simulation research, variable parameters research work is also made.In the fourth chapter, the close loop simulation results are presented and compared, using both: speed feedback control method and the computational method flow feedback control. Aiming at the performance of the proportional flow valve, experiment results of hydraulic elevator system using speed feedback control are given. At last, experiments results on the simulative load using computational method for flow feedback control are analyzed.In Chapter five, all the research contents are summarized, and some advises are given for the future of the project research.To sum up, the thesis showed that painstaking research have been done with the speed control system of hydraulic elevator using computational methods for flow rate feedback. Some valuable results will be helpful to research next step. A good platform for simulation and experiment is grounded.更多还原