Dynamic modeling and parameter influence of powerpack rigid-flexible coupling two-stage vibration isolation system for internal combustion multiple unit

doi:10.16731/j.cnki.1671-3133.2024.05.010

Abstract

Abstract: Powerpack system is an important part of the internal-combustion railcar,and its vibration isolation performance is directly related to the running safety and riding comfort of the train.A Frequency Response Function (FRF) based substructuring synthesis method was proposed for the rigid-flexible coupled Powerpack Two-stage Vibration Isolation System (PTVIS). The method divides the PTVIS into for substructures,i.e.,diesel generating set,radiator units,public frame and train floor. Thus, the combined frequency response function of flexible public frame B, flexible base D and rigid units A can be established by synthesizing the substructures through FRF-based substructuring synthesis method twice. The reduced model can greatly improve the modeling efficiency and calculation speed,which has more important value for engineering calculation and design.The correctness and accuracy of the proposed method were verified by comparing it with the results of finite element frequency response in ABAQUS software. Taking the powerpack system of an exported philippine internal combustion railcar as the research object,the FRF-based substructuring synthesis modeling method was used to study the influence of substructure mass ratio,substructure stiffness,substructure damping,stiffness and damping of isolators,and other parameters on the vibration isolation performance of the PTVIS,which provides theoretical support for the design and optimization of powerpack vibration isolation system.

Key words: powerpack rigid-flexible coupling two-stage vibration isolation system, FRF-based substructuring synthesis method, rigid-flexible coupling, vibration isolation performance, power flow

CLC Number:

TB53

LI Chao, YU Kangfan, ZHANG Jianrun, LIU Xiaobo. Dynamic modeling and parameter influence of powerpack rigid-flexible coupling two-stage vibration isolation system for internal combustion multiple unit[J]. Modern Manufacturing Engineering, 2024, 524(5): 71-79.

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