重载静动态电液测力建模与实验研究

发布时间：2017-12-28 08:14

本文关键词：重载静动态电液测力建模与实验研究　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 电液测力 重载 测量精度 摩擦泄漏 标定

【摘要】：电液测力系统可用于感知重载大量程力的信息,在重载测力领域具有重要的应用价值。本文为提高电液测力系统的测量精度,对其系统中核心执行元件液压缸的摩擦与泄漏模型进行了研究与分析,基于有限元软件进行了仿真验证,最后搭建了电液测力实验系统,开展了系统的实验研究。主要内容如下:首先,基于弹塑性变形理论对电液测力系统中执行元件液压缸的摩擦进行了分析,得到了接触摩擦模型;基于流体动力学理论对液压缸的泄漏切向力进行分析,得到泄漏切向力模型;分析了基于Lu Gre摩擦模型的液压缸等效摩擦力表述方法,并进行了参数辨识及数值算例分析。其次,用有限元软件Ansys对液压缸密封圈与缸内壁的接触摩擦力进行了仿真,用Fluent对液压缸内泄漏的流场分布进行了仿真,用Matlab/Simulink对Lu Gre摩擦的动态响应进行了仿真分析,分别验证了理论建模分析的正确性。最后,搭建电液测力实验系统,将电液测力实验状态分为主动静态测力、被动静态测力、主动动态测力及与被动动态测力等四种状态,从油液推力与负载的关系及油液推力与负载的差值与油液压力的关系两种角度探究基于电液系统的油液压力求得其负载的方法,进而得到对应的测量精度。对于前者,用基于最小二乘的线性拟合法探究了油液推力与负载的关系;对于后者,将摩擦泄漏总阻力与Lu Gre摩擦模型分别等效为差值进行补偿处理与分析,分别得到对应的测量精度。
[Abstract]:The electro-hydraulic force measurement system can be used to perceive the information of heavy load of heavy load, and it has important application value in the field of heavy load measurement. In order to improve the measurement accuracy of electro-hydraulic force measuring system, the system core executive friction element of hydraulic cylinder is studied and analyzed with the leakage model, based on the finite element software simulation, finally build electro-hydraulic force measurement system, experiment system. The main contents are as follows: firstly, the theory of elastic-plastic deformation of friction force measuring system of electro-hydraulic actuator hydraulic cylinders are analyzed based on the contact friction model; fluid dynamics theory of leakage of hydraulic cylinder were analyzed based on the cutting force, tangential force obtained leakage model; analyzed the expression method of Lu Gre the friction model of hydraulic cylinder based on equivalent friction, and the parameter identification and numerical analysis. Secondly, contact friction force between the sealing ring and the cylinder wall of the hydraulic cylinder with finite element software Ansys simulated the flow field distribution of leakage on the hydraulic cylinder with Fluent is simulated with Matlab/Simulink Lu Gre on dynamic friction response were simulated and analyzed respectively to verify the correctness of theoretical modeling analysis. Finally, build electro-hydraulic force measurement system, the electro-hydraulic force measuring experiment state is divided into active and passive static force static force, dynamic force and active and passive dynamic force of four kinds of state relations from the oil and the relationship between the thrust and the load of oil and oil thrust difference and hydraulic load the two point of view to explore the oil pressure of the electro-hydraulic system is obtained based on the method of load, and then obtain the corresponding measurement accuracy. For the former, the relationship between oil thrust and load is investigated based on the linear fitting method based on least squares. For the latter, the total resistance of friction leakage and the Lu Gre friction model are equivalent to the difference respectively, and the corresponding measurement accuracy is obtained respectively.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP212;TH137

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