拖拉机后桥半轴壳模糊可靠性稳健优化设计  

The fuzzy reliability robust design for rear-axle′ s half shaft housing of tractor

作　　者：李光辉[1] 张黎骅[1,2] 谢天磊 肖玲[3] 

机构地区：[1]四川农业大学信息与工程技术学院,四川雅安625014 [2]重庆大学机械传动国家重点实验室,重庆610044 [3]四川农业大学食品学院,四川雅安625014

出　　处：《机械设计》2014年第11期63-68,共6页Journal of Machine Design

基　　金：国家自然科学基金资助项目(51105261);四川省教育厅青年基金资助项目(10ZB037)

摘　　要：为合理设计拖拉机后驱动桥半轴壳,提高其可靠性和稳健性,减小设计质量,文中以东方红40型拖拉机后驱动桥半轴壳为研究对象,通过UG建立其三维模型,然后导入ANSYS Workbench中进行有限元分析,得出危险截面和危险工况,进而建立半轴壳多目标模糊可靠性稳健优化设计模型。通过编写遗传算法程序对模型进行求解,得到了半轴壳的最佳设计参数,与原设计相比,其质量减少20.54%,灵敏性减小33.08%。采用ANSYS Workbench对设计后的半轴壳强度进行验证,其最大应力为272 MPa,仍小于材料的许用应力。采用液压疲劳试验机得到其后备系数为6.2,满足国家标准要求。In order to design rear-axle＇s half shaft housing of tractor reasonably, and improve its reliability as well as robustness, this paper took rear-axle＇s half shaft housing of Dong Fang Hong type 40 tractor as the research object, and built its three-dimensional model using UG, then transmitted it into ANSYS Workbench to conduct finite element analysis of it, and then its dangerous cross-section and working-condition wereobtained. Proceeding to the next step, a multi-objective and fuzzy reliability robust optimization design model was established. By writing genetic algorithm program, this paper solved the mathematical model, and obtained the best design parameters of half shaft housing. Compared with the primary design, its quality was reduced by 20.54%, its sensitivity was cut down by 33.08%, which will contribute to safety of tractor. Adopting ANSYS Workbench to check strength of the half shaft housing after design, its maximum stress was 272 MPa, which is still under the material＇s allowable stress. Its backup coefficient was 6.2, which was obtained using the hydraulic fatigue testing machine, and it met the requirement of the national standard.

关 键 词：半轴壳 ANSYS WORKBENCH 模糊可靠度 稳健性 遗传算法 

分 类 号：S219.032.19[农业科学—农业机械化工程]