考虑流固耦合影响的柴油机油底壳模态及振动响应数值分析  

Numerical analysis of the modal and vibration response of diesel engine oil pan under the influence of fluid-structure interaction

作　　者：倪龑 翟黎明 韩旭东 梁福祥 李志强 NI Yan;ZHAI Liming;HAN Xudong;LIANG Fuxiang;LI Zhiqiang(FAW Jiefang Automotive Co.,Ltd.Powertrain Business Division,Wuxi 214026,China)

机构地区：[1]一汽解放动力总成事业部动力总成产品开发部,江苏无锡214026

出　　处：《应用科技》2024年第3期60-64,共5页Applied Science and Technology

摘　　要：油底壳是发动机的典型薄壁件,工作时不断承受动态载荷激励,其模态振型和振动响应对整机的可靠性和噪声、振动与声振粗糙度(noise vibration harshness,NVH)有着重要影响。本文以某柴油机拼接焊油底壳为对象,对其湿模态及振动响应进行了数值分析。首先,采用有限元法进行了自由状态下的干模态分析,并实测验证了数值模型的精度。然后,采用流固耦合的方法计算了湿状态油底壳模态,分析了实际工作时润滑油对结构特性的影响。最后,基于实测的螺栓振动进行了油底壳强迫振动响应分析计算,并通过振动测试验证了计算的准确性。测试结果表明,上述数值分析方法可以预测油底壳的工作状态下的振动特性,指导发动机的可靠性和NVH优化设计。As a typical thin-walled part of the engine,the oil pan was constantly subjected to dynamic loads while the engine was operating.Its modal shape and vibration response have an important impact on engine reliability and noise vibration harshness(NVH).Aiming at the splicing and welding oil pan for a diesel engine,the wet mode and vibration response were calculated and analyzed.First of all,the dry mode in a free state was analyzed by the finite element method(FEM),and compared with the test results,verifying the accuracy of the FEM model.Then the fluid-structure coupling method was used to calculate the mode of oil pan in a wet state,and the influence of lubricating oil on the structural characteristics under working condition was analyzed.Finally,based on the measured vibration of bolts,the forced vibration response of oil pan was analyzed and calculated,the accuracy of the calculation was verified by vibration test.The numerical analysis method described in this paper can predict the vibration characteristics of oil pan under working condition and guide the reliability and NVH optimization design of engine.

关 键 词：柴油机 油底壳 流固耦合 模态分析 强迫振动 有限元 干模态 湿模态 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]