拖拉机变速器箱体动态特性分析与优化设计  

Dynamic Characteristics Analysis and Optimization Design of Tractor Transmission Box

作　　者：王海林[1,2] 郑锐禹 王昱[1,2] 张廷浩 胡德正 Wang Hailin;Zheng Ruiyu;Wang Yu;Zhang Tinghao;Hu Dezheng(College of Engineering,South China Agricultural University,Guangzhou 510642,China;Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of Education,Guangzhou 510642,China)

机构地区：[1]华南农业大学工程学院,广州510642 [2]南方农业机械与装备关键技术教育部重点实验室,广州510642

出　　处：《机械科学与技术》2020年第11期1685-1690,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家重点研发计划项目(2016YFD0701100);国家自然科学基金项目(51705161);广东省科技计划项目(2017B010122001)资助。

摘　　要：针对重型拖拉机液压机械无级变速器箱体的减振降噪问题,对箱体进行动态特性分析,并运用结构优化方法进行箱体的优化设计。根据箱体的初始设计几何模型,建立箱体壳单元和体单元耦合的有限元模型,进行箱体模态分析和瞬态动力学分析;基于分析结果以箱体的前六阶加权模态频率最大化为目标,运用拓扑和形貌联合优化的方法得到了箱体最优化的材料分布和加强筋分布。分析结果表明:优化后箱体的强度和刚度满足要求,质量减少8.7%,前六阶固有频率都得到提高并且避开了激励频率。该方法为同类变速器箱体的优化设计提供了参考,降低产品设计成本,缩短研发周期。This paper focuses on the vibration and noise reduction of the transmission box for hydraulic mechanical continuous variable transmission in tractor.The dynamic characteristics of the transmission box are analyzed,and the optimum design of the box is also carried out with the structural optimization method.According to the geometric model of initial design of the transmission box,the finite element model of the box is developed via coupling between the shell and the solid elements.The modal analysis and transient dynamic analysis of the transmission box are performed.According to the analysis results,the maximization of the weighted natural frequencies of the first six modes is determined as the optimization objective.A combined topology and topography optimization scheme is employed to optimize the distribution of material and stiffener.The simulation results indicate that the strength and stiffness of the transmission box meet the design requirements and the box mass is reduced by 8.7%.Meanwhile,the natural frequencies of the first six modes are improved to avoid the excitation frequencies.This scheme provides a reference for the optimization design of the similar transmission box,which is beneficial to reduce the product design cost and shorten the design cycle.

关 键 词：变速器箱体 动态特性 模态分析 拓扑优化 形貌优化 

分 类 号：S219.032.1[农业科学—农业机械化工程] TH132.46[农业科学—农业工程]