摘要 翻滚保护装置是安装在工程车辆驾驶室外的一套被动保护装置，其性能指标的好坏直接关系到事故发生后驾驶员的生命安全。传统的结构设计一般在弹性范围内或弹塑性范围内,ROPS 的设计属于动态塑性大变形设计，动态塑性大变形设计至今尚属结构力学领域的尖端课题。近几年来，有限元技术在车辆设计中的应用越来越多,目前模拟在侧向集中静载荷下农用车辆翻滚保护装置非线性反应的研究较多，然而在农用车辆横向连续翻滚过程中承受均布载荷作用下 ROPS的变形及吸能规律的研究工作较少。 本文以日本生产的 KubotaZD-28零转弯半径割草机为研究对象，针对其在危险路况和斜坡上工作时引起的连续翻滚工况，用 Pro/Engineer软件建立了 ROPS 及割草机整机有限元模型，利用非线性有限元分析法对 ROPS进行强度分析，预测了车辆连续翻滚时ROPS 构件的应力、变形及变形后的 ROPS 是否侵入驾驶员容身空间。同时根据国际标准，对ROPS的性能进行验证，结果表明用非线性有限元对车辆ROPS 碰撞的数值模拟是一种有效的方法，其能量吸收达到国际标准。本文的研究成果为坐骑式割草机等园林车辆翻滚保护装置的设计提供了依据，对于提高工程车辆的作业安全性具有重要意义。 49621
毕业论文关键词：非线性有限元分析；割草机；翻滚保护装置；农用车辆
Abstract Roll-over protection device is a passive protection device installed in the project vehicle outside the cab, its performance is directly related to the life and safety of the driver after the accident. In recent years, more and more application of finite element technology in vehicle design. Used to simulate agricultural vehicles under static load concentrated in the lateral rollover protection device (RolloverProtectiveStructure (ROPS)) nonlinear response study more, however, to withstand the deformation of the ROPS under the uniform load in the horizontal continuous rolling process of agricultural vehicles and energy absorption regular work less. To KubotaZD28 zero turning radius mower for its work on the slope caused by the continuous rolling working conditions, finite element model of the ROPS and mower with Pro/Engineer software, using the finite element nonlinear analysis ROPS strength analysis, to predict when the vehicle is a continuous roll the ROPS component of stress, deformation and energy absorption and to predict the deformed ROPS whether invasive pilot shelter space. Validated according to international standards on the performance of ROPS, the results show that the nonlinear finite element numerical simulation of the collision of the vehicle ROPS is an effective way to meet international standards, its energy absorption, it can ROPS strength at the design stage forecast, to prove the correctness of the finite element analysis. The result of this paper provide a basis for the design of the mount mower and other garden vehicle roll-over protective structures, and have great significance for improving the job security of engineering vehicles.
Keywords: finiteelement analysis; mower; rops; agricultureal vehicles
目录
第一章 绪论 . 1
1.1 选题背景与意义 1
1.2 翻滚保护装置介绍 2
1.3 国内外研究概况 2
1.4 存在的不足 4
1.5本文的研究方法和主要内容 . 5
第二章 弹塑性力学的基本理论 . 6
2.1 弹塑性力学的基本概念 6
2.2 弹塑性力学的基本假设 6
2.3 弹塑性力学中常用的简化力学模型 7
第三章 割草机有限元模型的建立 9 ANSYS零转弯半径割草机翻滚保护装置设计:http://www.751com.cn/jixie/lunwen_52667.html