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