装载机液压系统与工作机构的联合仿真研究

发布时间：2018-06-15 07:21

本文选题：工作机构 + 液压系统　；参考：《集美大学》2011年硕士论文

【摘要】：传统装载机新产品开发周期长、成本高、对产品的评价需要在样机完成后才能进行。随着未来装载机高效、节能要求的提高,机、电、液一体化复杂程度不断加剧的特点,本研究以工作机构及其液压系统作为研究重点,提出建立装载机机械、液压耦合的联合仿真模型方案,为装载机的整机性能优化、评估提供依据。主要研究内容如下: 1.研究机械系统的运动、动力学建模理论,基于三维实体建模技术,建立装载机工作机构模型,研究机构各构件的约束关系及系统整体的运动驱动关系,创建三维工作机构运动学、动力学仿真模型,研究机构工作周期内的效能特性。 2.根据液压系统数学模型基本方程与实际装载机液压系统的组成与功能,应用EASY5建立液压系统仿真模型。根据液压系统各组成元件的结构尺寸、性能参数,结合液压试验平台的动态试验结果,对装载机液压系统仿真模型的各元件关键参数进行验证,研究液压系统在装载机工作周期内的动态特性。 3.研究机械系统与液压系统的联合仿真方案,根据执行元件液压缸的活塞动力学方程和工作腔压力流量方程,建立机械系统与液压系统间的参数交互关系,实现联合仿真。确定联合仿真模型的定量验证实验方案,利用液压实验平台实现装载机液压系统流量、铲斗工作位置及相应的负载控制,研究联合仿真的可靠性。 4.在联合仿真的基础上,研究装载机装卸工作周期过程中,不同阶段的负载变化与机构位姿变化对液压缸作用力的影响,以及换向阀动作对系统产生的冲击作用,研究铲掘阻力的加载试验。机液联合仿真的方案,综合考虑了机械系统惯量和液压系统的动态特性,改变了单一领域仿真的局限性,使液压系统与机械系统的状态参量在动作过程中能够同步变化,更加真实的模拟装载机工作过程。所建立的联合仿真模型,能够部分代替整机的实物样机实验,快速获得不同工况条件下液压系统动态特性与机构动力学响应,为装载机的整机综合优化提供了重要参考,可以推广应用到装载机的产品开发过程中,丰富装载机的特性评价方式,有效节约产品的开发成本。
[Abstract]:The new product development cycle of traditional loader is long and the cost is high. With the characteristics of high efficiency and energy saving of loader in the future, and the increasing complexity of integration of machine, electricity and liquid, this study focuses on the working mechanism and its hydraulic system, and puts forward the establishment of loader machinery. The combined simulation model of hydraulic coupling provides the basis for the performance optimization and evaluation of the loader. The main contents are as follows: 1. The kinematics and dynamics modeling theory of mechanical system is studied. Based on 3D solid modeling technology, the working mechanism model of loader is established, and the constraint relation of each component of the mechanism and the motion driving relation of the whole system are studied. The kinematics and dynamics simulation model of three dimensional working mechanism is established to study the efficiency characteristics in the working cycle of the mechanism. 2. According to the basic equations of the hydraulic system mathematical model and the composition and function of the hydraulic system of the actual loader, the simulation model of the hydraulic system is established by using EASY5. According to the structural size and performance parameters of each component of hydraulic system, combined with the dynamic test results of hydraulic test platform, the key parameters of the hydraulic system simulation model of loader are verified. Study on dynamic characteristics of hydraulic system in Loader working cycle. 3. The joint simulation scheme of mechanical system and hydraulic system is studied. According to the piston dynamic equation and pressure flow equation of actuator cylinder, the interaction of parameters between mechanical system and hydraulic system is established, and the joint simulation is realized. The quantitative verification experiment scheme of joint simulation model is determined. The flow rate of loader hydraulic system, the working position of bucket and the corresponding load control are realized by using hydraulic experimental platform, and the reliability of joint simulation is studied. 4. On the basis of joint simulation, the influence of load change and mechanism position change on hydraulic cylinder force in different stages during loading and unloading working cycle of loader and the impact of reversing valve action on the system are studied. The loading test of the resistance of shovel is studied. In the scheme of combined simulation, the inertia of mechanical system and the dynamic characteristic of hydraulic system are considered synthetically, and the limitation of single field simulation is changed, so that the state parameters of hydraulic system and mechanical system can change synchronously in the course of action. More realistic simulation of the loader working process. The established joint simulation model can partly replace the physical prototype experiment of the whole machine and obtain the dynamic characteristics of hydraulic system and the dynamic response of the mechanism under different working conditions, which provides an important reference for the comprehensive optimization of the loader. It can be popularized and applied to the product development process of loader, enrich the characteristic evaluation method of loader, and save the cost of product development effectively.
【学位授予单位】：集美大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH243

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