【作者】 张仁敬；

【导师】 宋桂秋；

【作者基本信息】 东北大学 ， 机械电子工程， 2008， 硕士

【摘要】 液压挖掘机工作装置是完成液压挖掘机各项功能的主要构件,其结构的合理性直接影响到液压挖掘机的工作性能和可靠性。本文以WY22挖掘机工作装置为研究对象,对其进行了有限元分析和动态分析。本文的主要工作有：首先,本文分析了挖掘机的市场需求和技术现状,提出了提高挖掘机产品质量的重要性和意义。通过挖掘机工作装置设计的分析技术介绍,针对挖掘机工作装置设计存在问题,引出了挖掘机工程分析的有关理论,阐述了有限元分析和运动仿真的方法和步骤。其次,本文对其动臂和斗杆进行了结构分析,采用ANSYS软件建立WY22挖掘机动臂和斗杆结构模型。根据动臂和斗杆的两种计算工况,建立动臂和斗杆力学模型。然后,根据实际情况确定了所用单元的类型和材料属性,建立了WY22挖掘机动臂和斗杆有限元模型；确定动臂和斗杆的边界条件以及铰孔处载荷的处理方式,并且施加边界约束和载荷；利用有限元分析软件ANSYS对WY22挖掘机动臂和斗杆结构强度和刚度进行了数值计算,得到各工况动臂和斗杆的应力、位移分布情况,对动臂和斗杆进行模态分析,得出其主要振型。同时对改进后的动臂和斗杆进行了分析计算,并对结果进行了比较。最后,利用三维设计软件Pro/E建立了WY22挖掘机工作装置的结构模型,并对工作装置进行了运动及动力分析,得到了铲斗运动速度、加速度和一些部件的受力曲线。有限元分析以及运动仿真的结果验证了WY22挖掘机动臂和斗杆结构强度满足设计要求,动臂和斗杆固有频率与挖掘机工作频率也不会引起共振现象,带筋板的动臂和斗杆更能满足设计要求。运动及动力分析证明WY22挖掘机工作装置运动设计合理。论文研究成果为下一步的WY22挖掘机工作装置的结构优化创造了条件。通过对WY22液压挖掘机的工作装置进行有限元分析和动态分析,以确定结构设计的合理性,进而使该装置结构设计达到国内先进水平。更多还原

【Abstract】 The working equipment of a hydraulic excavator, which is an important part to complete the function of hydraulic excavators, affects directly the working performance and the reliability of the hydraulic excavator. This thesis is taking the working equipment of WY22 excavator as an example, the finite element analysis and dynamic analysis are applied for it. The following are the main contents of this paper.First of all, this thesis analyzes the market demand for excavators and gives the importance and meanings on improving excavator manufacturing quality in the first. Through the introduction of the analysis of excavator working equipment’s design, the problems companying with the working equipment design is presented and the theory of excavator engineering analysis is discussed. And then the methods and steps using finite element analysis and movement simulation are well elaborated.Secondly, the structure analysis of boom and arm are conducted. Their 3D structure models of WY22 excavator are built by software ANSYS. According to two kinds of working condition, the mechanics model of the boom and the arm are established.Thirdly, after defining the element type and material attribute based on practical situation, finite element models of WY22 excavator are established. The boundary condition and the processing mode of loads on the hole can be determined, and displacement and load are applied to finite element model. Analyzing the structural strength and stiffness of the boom and the arm by ANSYS, the stresses and the displacements of the working condition are acquired. The main vibrating model is obtained after analyzing the model of the boom and the arm. The boom and arm with rib are analyzed at the same, the results are compared.Finaly, establishing a structure model of the WY22 excavator’s working equipment by 3-D design software Pro/E, conducts a analysis of the dynamic, the velocity and acceleration of bucket and the loads of some parts are obtained.The structural strength is to meet the design requirements to be tested and verified by the results of finite element analysis and simulation, the natural frequency of boom、arm and excavator will not be resonance. The boom and arm with rib are better suited the design requirement. The design is reasonable proofed by the dynamic analysis. The research results are to create the conditions for structural optimization of the WY22 excavator’s working equipment in the next research.It can define the reasonableness of structure design by using the finite element method and movement simulation to analyze the working equipment of WY22 excavator. The structure design way of this working equipment can attain the advanced level by this analysis in future.更多还原