基于Modelica的装载机工作装置仿真研究

发布时间：2019-05-05 09:22

【摘要】：装载机的体积大、重量大、研制成本高一直以来都是制约其发展的主要因素。用计算机建模与仿真代替物理实验可以降低其研制成本,这已经成为了装载机快速发展的重要技术。近年来,计算机仿真技术对于装载机的应用越来越多,但是针对工作装置的仿真仍然存在着以下两个问题:1、仿真优化目标较单一,难以进行多学科仿真优化;2、通过接口,运用多个软件进行联合优化,难以在统一的环境下进行仿真优化。基于Modelica建模语言,可以建立工作装置的多学科仿真模型,并运用Dymola软件进行仿真分析,从而实现工作装置的机械、液压等联合仿真,对于装载机工作装置的设计与仿真优化有显著作用。本文主要完成以下工作:1介绍了装载机工作装置的发展概述、结构型式、设计要素等,提出了论文的整体构架,初步认识装载机工作装置。2针对论文的整体构架,简要介绍本文进行多学科建模仿真所需的Modelica语言、Dymola仿真软件以及卸料工况下可能出现的回缩现象,为后续章节奠定基础。3介绍了液压系统和机械系统的基本原理,为装载机工作装置机械系统和液压系统的建模提供理论基础。然后利用Modelica语言和Dymola平台,并基于液压系统建模的基本原理和机械系统建模的基本原理,对液压系统的接口以及其各个基础元器件分别进行建模,基础元件模型用于装载机工作装置的机械系统和液压系统地建模,为后续装载机工作装置仿真奠定基础。4利用已建立的机械系统和液压系统模型,搭建装载机工作装置的整体仿真模型,对装载机工作装置的不同工况进行仿真,比较分析了两液压缸的压力、速度、流量等。5着重分析了装载机工作装置在卸料工况下,动臂油缸和转斗油缸的受力情况,针对极限卸料位置处可能出现的回缩现象进行了仿真优化。
[Abstract]:The large volume, heavy weight and high development cost of loader have always been the main factors restricting its development. Using computer modeling and simulation instead of physical experiment can reduce the development cost, which has become an important technology for the rapid development of loaders. In recent years, the application of computer simulation technology to loader more and more, but there are still two problems in the simulation of working device: 1, the objective of simulation optimization is relatively single, it is difficult to carry out multi-disciplinary simulation optimization; 2. It is difficult to carry out simulation optimization in a unified environment by using multiple software for joint optimization through interface. Based on the Modelica modeling language, the multidisciplinary simulation model of the working device can be established, and the simulation analysis can be carried out by using the Dymola software, so as to realize the joint simulation of the working device, such as machinery and hydraulic pressure, and so on. It plays an important role in the design and simulation optimization of loader working device. The main work of this paper is as follows: (1) the development, structure and design elements of loader working device are introduced, the whole frame of the paper is put forward, and the working device of loader is preliminarily understood. (2) aiming at the whole frame of the paper, This paper briefly introduces the Modelica language, Dymola simulation software and possible retraction phenomenon under unloading condition, which is necessary for multi-disciplinary modeling and simulation in this paper. 3 the basic principles of hydraulic system and mechanical system are introduced, and the basic principles of hydraulic system and mechanical system are introduced, and the basic principles of hydraulic system and mechanical system are introduced. It provides a theoretical basis for the modeling of mechanical system and hydraulic system of loader working device. Then using Modelica language and Dymola platform, and based on the basic principle of hydraulic system modeling and the basic principle of mechanical system modeling, the interface of hydraulic system and its basic components are modeled separately. The basic component model is used to model the mechanical system and hydraulic system of the loader working device, which lays the foundation for the simulation of the working device of the subsequent loader. (4) using the established mechanical and hydraulic system models, The whole simulation model of the loader working device is set up, the different working conditions of the loader working device are simulated, and the pressure, velocity and flow rate of the two hydraulic cylinders are compared and analyzed. 5. 5 the working device of the loader under the unloading condition is analyzed emphatically. In this paper, a simulation optimization is carried out for the possible retraction phenomenon at the limit unloading position of the moving arm cylinder and the rotary bucket cylinder under the force condition of the moving arm cylinder and the rotary bucket cylinder.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU623.9

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