发动机油底壳动态特性的数值研究  

Numerical Study on Dynamic Characteristics of Engine Oil Pan

作　　者：尹长城 刘馨竹 岳国生 YIN Changcheng;LIU Xinzhu;YUE Guosheng(School of Automotive Engineering,Hubei University of Automotive Technology,Shiyan,Hubei,442000,China;-Xiangyang Qunlong Automobile Parts Co.,LTD.)

机构地区：[1]湖北汽车工业学院汽车工程学院,湖北十堰442000 [2]襄阳群龙汽车部件股份有限公司

出　　处：《小型内燃机与车辆技术》2023年第1期76-80,共5页Small Internal Combustion Engine and Vehicle Technique

基　　金：湖北省教育厅重点项目(D20151802);湖北省重点实验室开放基金项目(ZDK1201305);湖北省协同创新中心项目(2015XTZX042)。

摘　　要：运用试验模态技术对油底壳空壳自由状态进行了模态试验,验证有限元模型分析结果的可靠性。油底壳约束模态分析表明,在油底壳空壳状态下,1阶固有频率符合设计要求;当考虑到机油质量后,1阶固有频率大幅下降,不能满足设计要求。为此提出了将油底壳上底面宽度减小(方案A)、在油底壳上底面加5根筋(方案B)2种改进方案,并进行了有限元模态分析。结果表明,方案B符合设计标准。在此基础上,以提高油底壳结构的1阶固有频率为目标,提出了油底壳形貌优化方案(方案C),将方案B中左右两边的筋去掉,只留下中间的3条筋。结果表明,方案C油底壳的固有频率与方案B无太大差别,其1阶固有频率满足设计要求,而工艺更加简单一些。因此,将方案C作为油底壳最终设计方案。The free state of oil pan shell was tested with experimental mode technology to verify the reliability of the results of finite element model analysis.The restraint mode analysis of the oil pan shows that the 1st natural frequency meets the design requirements under the oil pan shell state.When considering the oil weight,the first-order natural frequency decreases greatly,which can not meet the design requirements.For this reason,two improved schemes,i.e.reducing the width of bottom surface on oil pan(scheme A)and adding 5 reinforcements(scheme B)on the bottom surface of oil pan,are proposed and the finite element modal analysis is carried out.The results show that scheme B meets the design criteria.On this basis,in order to improve the 1st natural frequency of the oil pan structure,a scheme for optimizing the oil pan morphology(scheme C)was proposed,in which the left and right ribs in scheme B were removed,leaving only three middle ribs.The results show that the natural frequency of scheme C oil pan is not much different from that of scheme B.The first-order natural frequency of scheme C oil pan meets the design requirements and the process is simpler.Therefore,scheme C is taken as the final design scheme for the oil pan.

关 键 词：油底壳 有限元 模态 频率 形貌优化 

分 类 号：U464.12[机械工程—车辆工程]