英语翻译904型拖拉机是东风农机集团一款比较成熟的产品,该机底盘在设计之初就留有设计余量,为新机型的开发做了准备.在长期

英语翻译
904型拖拉机是东风农机集团一款比较成熟的产品,该机底盘在设计之初就留有设计余量,为新机型的开发做了准备.在长期的使用过程中发现,该机底盘整体结构强度较好,因此希望在其基础上开发1254型拖拉机底盘.为降低设计风险,先应用有限元分析方法对904型拖拉机底盘进行校核计算,找出底盘设计中的薄弱环节并提出改进方案.在此基础上,提出1254型拖拉机底盘的设计方案,并再次进行有限元校核计算,以确保设计方案的可靠性.
1254型拖拉机底盘的设计方案高度继承了904型拖拉机底盘中的零件,仅重新设计了前托架与后桥壳体,提高了不同功率段拖拉机零件的通用性和互换性,有利于企业系列化生产.对1254型拖拉机底盘的校核分析中,在考察各零部件结构强度的基础上,首次提出了接触面压力的评价指标,考察不同零件之间接触面上的压力分布,对零件之间连接刚度的影响.本文主要研究内容：
根据904型拖拉机底盘的结构组成,利用SolidWorks软件建立拖拉机底盘的几何模型,利用专业的前处理软件Hypermesh对几何模型进行网格划分,得到有限元模型.参照国外拖拉机企业试验方法,确定了本次计算的七个计算工况,模拟拖拉机在现实工作中可能遇到各种恶劣情况,可有效评估拖拉机底盘的结构强度是否满足设计要求,利用ANSYS软件对有限元模型进行了结构强度分析,得到底盘各零件的应力分布云图,找出了底盘各零部件的结构薄弱处,对应力集中比较严重零部件（包括前托架、离合器壳、最终传动壳体）进行结构改进,改进后的底盘的整体刚度得到提升.
使用与904型拖拉机底盘分析计算中类似的计算工况,对1254型拖拉机底盘进行分析验证,通过分析应力云图,发现1254型拖拉机的后桥壳存在应力集中现象,并给出了改进方案,改进后应力集中情况有所改善；发现后桥壳与离合器壳之间的连接刚度较差,相应地提出了2种改进方案.通过比较改进后的接触压应力分布情况,得出改进方案1可行性更高.
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904 type tractor is Dongfeng Agricultural Machinery Group is a relatively mature product, the chassis was designed from the beginning with the design margin, prepared for the development of new models. Found in the process of long-term use, the chassis structure strength is good, so I hope to develop type 1254 tractor chassis on the basis of. In order to reduce design risk, first using the finite element method to calculate 904 type tractor chassis, find out the weak links of chassis design and put forward the improvement scheme. On this basis, puts forward the design scheme of 1254 type of tractor chassis, and the finite element calculation, to ensure reliability design scheme. Design 1254 type tractor chassis height inherited parts of 904 type tractor chassis, only the redesign of the front bracket and the rear axle housing, improve the power of different period of tractor parts commonality and interchangeability, conducive to series production enterprises. Check on the analysis of 1254 type of tractor chassis, on the base of reviewing the various parts of structure strength, first proposed the evaluation index of contact pressure, contact between different parts of the pressure distribution on the surface, on the effects of connection stiffness between parts. The main research contents of this paper: according to 904 type tractor chassis structure, set up the geometric model of tractor chassis using the SolidWorks software, carries on the grid division of the geometric model by using Hypermesh software professional, the finite element model. According to the foreign enterprise test method for tractor, identified seven calculating conditions this calculation, meet all kinds of harsh environment simulation of tractor may in reality, can effectively evaluate tractor chassis structure strength whether meet the design requirements, the finite element model of the structure strength analysis using ANSYS software, obtained stress distribution nephogram of the parts of the chassis the chassis, find out the weak parts of structure, the stress concentration is more serious parts (including a front bracket, clutch housing, final drive housing) were improved, the improved overall chassis rigidity is improved. Using the calculation conditions similar to the calculation and type 904 tractor chassis analysis, analysis of 1254 type tractor chassis, by analyzing the stress nephogram, found the rear axle housing type 1254 tractor exists the phenomenon of stress concentration, and gives the improved scheme, the improved stress concentration situation has improved; the connection stiffness between the poor after the discovery of the axle housing and clutch shell, put forward 2 kinds of schemes. Compressive stress distribution through the comparison of the improved contact, obtains the improvement scheme of 1 higher feasibility.