【作者】 单东升；

【导师】 孔祥东； 高英杰；

【作者基本信息】 燕山大学 ， 机械电子工程， 2006， 博士

【摘要】 液压AGC系统是一个集板带材料、轧机本体、轧制工艺、液压系统、电气系统以及控制系统等于一体的复杂系统。深入研究液压AGC系统,建立机电液一体化模型和提高板带材厚度精度是轧制领域的一个深远而广泛的课题,具有重要的理论意义和应用价值。本项研究在国家自然科学基金和河北省自然科学基金的资助下,主要进行以下几个方面研究:建立机电液一体化模型、通过模型分析,提出轧机液压AGC系统和轧制工艺以及控制策略的改进依据;使用参数辨识、参数优化,数据分析,信号处理等工具对轧制过程数据进行厚度偏差分析,实现这些工具相互之间的融合和调用;完成液压AGC系统仿真和轧制实验等软件开发;利用某单机架可逆实验轧机和燕山大学300四辊轧机进行针对性实验,验证理论模型,为优化控制策略以提高系统性能奠定基础。本文针对轧机机电液一体化模型进行了深入的研究,从液压系统,机械系统,轧制工艺和控制策略等方面进行了全面而系统地分析,进一步完善了现有的液压AGC系统数学模型。基于位置闭环模型和轧制力闭环模型,分析了伺服阀、液压油缸、高压管道、等液压关键元件及性能参数对液压AGC系统的动态响应和稳态精度的影响;随着轧制工艺的变化,系统控制方式也应作调整,其理论依据为何,本文做了进一步研究,即根据优化目标,制定控制参数优化方案,提高控制系统性能。这些研究成果对制定轧制工艺和控制策略而言具有重要的参考价值,也是国内外众多专家学者进行广泛而深入研究的热点问题。基于传统的轧制机理分析,结合现代的数据分析和计算工具,对影响厚差的因素进行分析;FFT工具,小波分析工具,参数辨识工具,相关性分析,非线性回归分析,信号处理工具等丰富了数据分析处理的功能,使得轧制系统在不同轧制工艺下的各厚差影响因素对板厚的影响得到量化,从而给制定轧制工艺,设计液压AGC系统,制定控制策略提供了重要参考,也为理论模型的研究提出新的思路。从理论和实践的角度来分析液压AGC系统,为轧制工艺的改进和智能化的研究提供了基础;这对于指导生产,提高轧制效率和产品质量,具有重要的理论意义和应用价值。更多还原

【Abstract】 Hydraulic automatic gauge control (AGC) system is an integrated system which combines sheet strip, rolling mill, rolling technical, electrical system as well as control system. It is a profound and comprehensive topic to probe into hydraulic AGC system mechatronic hydraulic model to increase sheet strip accuracy in gauge.With the National Natural Science Fund and Hebei Natural Science Fund, based on Yanshan University 300 four-high rolling mill experiment, this study consists of the following aspects: To establish hydraulic AGC integrated model, analyze, simulate and revise the model, to shed light on improving the hydraulic AGC system, rolling mill practice and control strategy. To analyze the data of the rolling process systemically, involving FFT tool, parameters identification tool, parameters controlling and optimization tool, data analysis tool, signal processing tool, to research on the implementation approach and integrating methods of the kit, and the procedure call. To complete the software development of the virtual rolling mill simulation system and field roll milling experiment. To improve control strategy by verifying the theoretical model based on the Yanshan University 300 four-high mill experiment.The dissertation researches in-depth on the mechatronic hydraulic model, to analyze and simulate the system from the aspects of rolling mill practice and control strategy, to improve the hydraulic AGC systemic mathematical model.Base on the position closed-loop model and rolling force closed-loop model, the dissertation separately analyzes the performance parameters of fluid power key elements such as servo-valve, cylinder, control-piping and accumulator and its influence on hydraulic AGC systemic dynamic response and steady state accuracy. It analyses the influence of back pressure characteristics and supply pressure characteristic on the system. It comes up with the solutions of some common problems such as selecting servo-valve, designing screw-down cylinder independently, designing fluid power recruit hydraulic system. These research findings provide fluid power AGC system design staff with important theoretic references, give some hints to establish compensate strategy, thus it has important theory meaning and application value.The method of controlling system should be adjusted with the changes of rolling mill practice. The dissertation further studies on the controlling methods and their theory background, namely, establish controlling parameter optimization schemes and improve control system’s performance according to the optimization objective. These research findings are important references to establish rolling mill practice and control strategy. Besides, they are the hot issues which specialists at home and abroad would like to discuss about comprehensively and lucubrately.The dissertation makes diagnosis on thickness error, based on conventional rolling mill mechanical analysis with modern data analysis and computational tools. FFT tool, wavelet analysis tool, parameter identification tool, relevance analysis, nonlinear regression analysis and signal processing tool could fulfill the data analysis functions, quantize the influence of roll milling system under different rolling mill practice on strip thickness. Thus the paper could offer references to the rolling mill practice establishment, hydraulic AGC system design. Besides, it gives clues to the research on theoretical model.更多还原