Analysis of NVH performance of a diesel turbocharger bracket and its improvement
LI Junqi
GAO Shuzhen
YAO Yajun
ZHANG Chen
LIANG Wei
Abstract：In order to solve the fracture of the turbocharger bracket of a lightweight tight-coupled post-treatment diesel engine during the performance development,a three-dimensional model of the exhaust system of the diesel engine is established by using the finite element simulation analysis method,and the tetrahedral unit mesh is jointly divided by SimLab and HyperMesh software.The modal results of the system are calculated by ABAQUS finite element analysis software.Combined with the noise vibration harshness(NVH)test and the microscopic analysis of the fault parts,the cause of the fracture is summarized.The test for the improvement scheme of turbocharger support structure are put forward,and NVH performance test and durability test are carried out.The results show that the reasons for the fracture of the turbocharger bracket are the resonance between the engine and the bench,the design stiffness of the turbocharger bracket and the insufficient material strength.Using the cushion with lower vertical stiffness as the turbocharger bracket cushion developed for the platform of this model,the resonance speed can be reduced from 776 r/min to 318 r/min,and the vibration speed can be reduced from 382 mm/s to 89 mm/s,which avoids the resonance risk between the whole machine and the platform.The turbocharger bracket material is replaced,and additional bars in the direction of the bracket stress deformation are added,which can increased the tensile strength of turbocharger bracket,the NVH performance of the exhaust system can meet the requirements,and the fault of the turbocharger bracket fracture is solved.
Keywords：tightly coupled post-treatment diesel engineturbocharger bracketNVHfractureresonance
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 90-96 )