液压矫平机控制系统研究

【作者】 胡宏宇；

【导师】 顾越州；

【作者基本信息】 浙江大学 ， 机械电子控制工程， 2003， 硕士

【摘要】 轧辊矫平机是材料平整工业中十分重要的设备，但高精度液压位置伺服控制矫平机国内还属空白。液压矫平机最为关键的技术是位置控制精度，它直接影响着加工产品的质量，本研究工作的重点是液压矫平机的位置控制系统，在此基础上实现了基于PLC的液压矫平机控制器。 论文采用相关辨识法对液压矫平机位置控制系统进行辨识，得到了逼近实际位置控制系统的传递函数数学模型，并借助此传递函数对控制算法进行了仿真研究，在仿真结果的基础上做了现场试验，最后确定了适合实际位置控制系统的液压伺服控制策略，使矫平机的控制性能首先满足圆锯片矫平这一实际生产的需要。 第一章主要论述了课题研究的背景、意义及内容。首先概述了材料平整技术现状、圆锯片加工业发展新趋势和国内外矫平机技术现状等相关背景，阐述了本课题研究的意义，随后综述了近代液压伺服控制策略现状与发展，最后结合实际情况确定了本课题的具体研究内容。 第二章论述了液压矫平机工作原理与系统组成。首先介绍了板材矫平原理，进而分析了液压矫平机结构，随后提出了液压矫平机控制目标，并从整体上分析了电液控制系统原理，最后论述了系统的液压传动部分和电气控制部分的组成，及各自在系统中的作用，并对主要部件的工作原理和特性进行了简单介绍。 第三章主要讨论位置控制系统的辨识。首先简单介绍了系统辨识，并总结出相关辨识法的优点，随屙进行了相关辨识法的实验设计和实验数据处理，得到冲激响应函数，并拟合出系统传递函数，最后进行了模型的验证和修正。中间还讨论了阀控液压缸位置控制系统数学模型结构。 第四章是论文的重点，主要研究位置控制系统的控制策略。首先分析了位置控制系统存在的各种误差来源，并讨论了对应的解决措施，随后依据第三章系统辨识的传递函数，分别对常规PID控制算法、参数模糊自整定PID控制算法和模糊规则自校正控制算法以及位置同步控制结构进行了仿真研究，最后通过现场试验，确定了符合实际系统的最佳控制策略和控制参数。 第五章对液压矫平机控制系统进行了总结，指出控制系统中还存在的不足，并展望了今后进一步开展的研究工作。 附录部分简单介绍了基于PLC的液压矫平机控制系统的软件实现。更多还原

【Abstract】 Roller flattening machine is a pivotal equipment in the material flattening industry. But high-precision hydraulic position servo control roller flattening machine can’t be made in china. Its most important problem is position control precision, which directly affects product quality. So this paper focuses on the position control system of hydraulic roller flattening machine.Correlation identification is used to identify the position control system. The result of system identification is the transfer function close to the real system. In SIMULINK, the transfer function replaces the real system. Control algorithms are simulated in the SIMULINK, whose results guide to do several field experiments. The most suitable control algorithm is found after the field experiments, and the control performance meets the need of flatting disk saw firstly.Chapter one is concerned with the background, significance and primary content of the research. At first, the background is introduced, including the technical actuality of material flattening industry and roller flattening machines in the world, and the trend of disk saw process. The most important significance is to do homemade work. Then the actuality and development of modern electro-hydraulic servo control algorithms are also summarized. At last, the particular content of the paper is decided.Chapter two discusses the principle and component of hydraulic roller flattening machine. Firstly, the principle about board flattening is introduced, and the whole mechanical construct is explained. Secondly, the control object is put forward, and the control system principle is analyzed integrally, made up of velocity subsystem and position subsystem. Lastly, the principle and characteristic of some important parts of hydraulic subsystem and control subsystem are introduced.Chapter three is concentrated on position control system identification. The first part introduces system identification, and draws the conclusion that the correlation identification algorithm is the best one. The second part discusses experiment design and experimental data calculation. The third part sets up the position system transfer function mathematical model, and resolves the parameters of the system transfer function. The last part validates and revises the model.Chapter four is the emphases of the paper, which studies the control algorithms of position control system. The first section analyzed the error resources and takes some measure. The second section does simulation study about several control algorithms, including traditional PID control, self-tuning fuzzy PID control, fuzzy rule self-tuning control, and position synchronization control construct. The last section does field experiments and decides the most suitable control algorithm and control parameters.Chapter five deals with the sum-up of the research work and points out the shortcomings. It also prospects the further work.The appendix explains the software of PLC controller of hydraulic roller flattening machine.更多还原