某农用拖拉机新型门式车桥的结构强度与疲劳寿命分析  

Analysis of structural strength and fatigue life of a new portal axle for agricultural tractors

作　　者：祝鑫森 吴文军[1] 高巧明 宁业烈 ZHU Xinsen;WU Wenjun;GAO Qiaoming;NING Yelie(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545616,China;Huilaibao Machinery Manufacturing Co.,Ltd.,Hepu County,Beihai 536100,China)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545616 [2]广西合浦县惠来宝机械制造有限公司,广西北海536100

出　　处：《广西科技大学学报》2025年第2期18-25,共8页Journal of Guangxi University of Science and Technology

基　　金：中央引导地方科技发展资金项目(桂科ZY22096023)资助。

摘　　要：针对某农用拖拉机新型门式车桥在生产作业过程中时常出现结构部件破坏的问题,以新型门式车桥为研究对象,首先利用有限元分析软件依次对新型门式车桥在正常行驶工作状态下的最大垂向力、最大牵引力、最大制动力和最大侧向力等4种典型极端工况进行仿真运算,分别得到各工况下新型门式车桥的应力云图、位移云图和受力的薄弱部位;然后,通过多体动力学仿真软件建立门式车桥整车多体动力学模型,利用虚拟迭代的方法得到门式车桥的激励载荷谱;最后,结合有限元应力分析结果、门式车桥载荷谱及材料的S-N曲线,对门式车桥进行疲劳寿命仿真计算,得到门式车桥的疲劳寿命及疲劳损坏点。结果表明:依据有限元仿真得到的强度与疲劳寿命薄弱点与实际破坏点完全一致,验证了本文分析方法的准确性和有效性,为门式车桥的设计优化提供一种可靠的仿真方案,极大地缩短了相关产品的研发周期。To investigate the real causes of frequent structural component failures of a new portal axle for agricultural tractors during production and operation,the new portal axle was taken as the research object.Firstly,the ANSYS finite element analysis software was used to sequentially simulate and analyze the maximum vertical force,maximum traction force,maximum braking force,and maximum lateral force of the portal axle under four different typical operating conditions during normal driving.The corresponding stress cloud maps and displacement cloud maps were obtained,and the weak points of the portal axle under different operating conditions were analyzed.Then,a multi-body dynamics model of the entire vehicle with the portal axle was established using multi-body dynamics simulation software,and the excitation load spectrum of the portal axle was obtained using virtual iteration.Finally,combined with the finite element stress analysis results,the portal axle load spectrum and the material S-N curve,the fatigue life of the portal axle was simulated and calculated,and the fatigue life and fatigue damage points of the portal axle were obtained.The results show that the weak points of strength and fatigue life obtained by finite element simulation are completely consistent with the actual failure points,verifying the accuracy and effectiveness of the analysis method in this paper.This provides a reliable simulation solution for the design optimization of the portal axle,greatly shortening the development cycle of related products.

关 键 词：门式车桥 有限元方法 虚拟迭代 疲劳寿命 

分 类 号：S219.03[农业科学—农业机械化工程]