农机变速箱体的有限元模态分析及改进设计  

Finite element modal analysis and improved design of gearbox case in agricultural machinery

作　　者：石林[1] 王扬渝[1] 蒋建东[1] 赵章风[1] 张宪[1] 

机构地区：[1]浙江工业大学机械制造及自动化教育部重点实验室,浙江杭州310032

出　　处：《浙江工业大学学报》2010年第2期229-232,共4页Journal of Zhejiang University of Technology

基　　金："十一五"国家科技支撑计划资助项目(2006BAD11A10-02);国家自然科学基金资助项目(50805131);浙江省科技厅重大专项资助项目(2007C12089;2008C02006-3);浙江省重中之重学科开放基金资助项目(ZGD200703;56310202002)

摘　　要：某型农机变速箱体在使用过程中,行走轮空腔及其连接区域易发生断裂损坏,运用Nastran对其进行模态分析,结果表明该区域相对振幅较大.在相对振幅较大的区域增加2 mm的壁厚并合理布置加强筋以增加其刚度.对改进设计后的样机进行有限元模态分析和基于LMS Test.Lab的模态试验,结果表明改进后的箱体薄弱区域相对振幅最大降低约为30%.箱体动态特性得到显著增强,有助于整机动态性能的提高.The cavity of rotating wheels shaft and their conjunction areas of gearbox case in one type of agricultural machinery tend to break while working. The modal analysis was carried out with software Nastran and it was found that the amplitude was relative large in this area. The wall was thickened by 2ram and ribs were rationally arranged to improve the stiffness of the area. The finite element mode analysis and the modal experiment based on LMS Test. Lab of the improved prototype were carried out. The results showed that the relative amplitude was reduced by 30% maximally. The dynamic characteristics of the case were apparently improved, which could in turn improve the dynamic performance of agricultural machinery.

关 键 词：农机 变速箱体 模态分析 模态试验 

分 类 号：S224.4[农业科学—农业机械化工程]