液压弯辊系统对板凸度影响的实验分析-experimental analysis of influence of hydraulic bending roller system on crown of plate.docxVIP

摘要板形是衡量板带产品质量的重要指标，其可用板凸度来表示。液压弯 辊系统作为最常用、最有效的板形控制方式，其性能对板形质量有着直接 的影响。关于液压弯辊系统对板凸度影响的研究已经有了很多的理论研究 成果，但系统实验研究对提高液压弯辊系统控制板形的精度有重要意义。 因此，本文从理论与实验相结合的角度出发，对液压弯辊系统对板凸度影 响进行实验研究，为提高板带钢材的产品精度提供可靠的参考依据。本文将液压弯辊系统对板凸度影响的研究内容主要分为两部分：一部 分是液压弯辊系统的系统辨识；另一部分是弯辊力对板凸度影响的理论计 算及实验分析。分别采用 MATLAB 辨识工具箱里的 ARX 辨识法与 State Space 辨识法 对液压弯辊系统进行系统辨识。分析比较两种辨识方法得到的模型，得出 State Space 辨识法得到模型更加精确。利用 State Space 辨识法获得的液压 弯辊系统精确模型可为分析并改善液压弯辊系统的控制精度和响应能力提 供参考。但同时由于辨识法不具有普适性，辨识得到的模型仅适用于被辨 识对象，因而具有一定的局限性。利用弹性基础梁法建立弯辊力对板凸度影响的模型，得到五种工况下 弯辊力对板凸度的理论影响曲线组。然后通过实验得到弯辊力对板凸度影 响的实际数据，对实验数据进行处理与计算，最终得到五种工况下的弯辊 力对板凸度的实际影响曲线组。最后分析比较理论影响曲线组与实际影响 曲线组，总结液压弯辊系统对板凸度影响的规律。关键词 液压弯辊系统；板形；板凸度；模型；弯辊力；系统辨识IAbstractFlatness, usually expressed in plate crown, is an important indicator in measuring the quality of plate strip product. As the most common and efficient means of flatness control, Hydraulic Bending Roll System has a direct effect on the quality of flatness. Many achievements have been made in the study of Hydraulic Bending Roll System’s effect on plate crown. Yet, most of them were theoretical analysis and simulation, while further researches still need been made in systematic and experimental way. Therefore, combining theory with experiment, this thesis studies Hydraulic Bending Roll System’s effect on plate crown systematically, providing solid evidences for improving the precision of plate strip steel products.This thesis classified the process of the research on Hydraulic Bending Roll System’s effect on plate crown into two parts: one is Hydraulic Bending Roll System’s identification; the other is theoretical calculation and experimental analyses on Hydraulic Bending Roll System’s effect on plate crown.This thesis identified the input and output signals of Hydraulic Bending Roll System got from experiments by ARX identification method in MATLAB Identification Toolbox and State Space identification method respectively. Via comparing the two identification models, this thesis came to the conclusion that the model