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최승찬(Seungchan Choi),복다미(Dami Bok),임승호(Seungho Lim),오병영(Byungyung Oho),박준모(Junmo Park),정언재(Eunjae Jung),이한성(Hanseong Lee),도중석(Jungseok Do),왕성준(Seongjun Wang) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
CAE is one of powerful tools to save time and cost because vehicle performance can be reviewed and improved in early development stage. Moreover, it is possible to enhance the drawing completeness of part suppliers at the initial design stage by simple system level CAE analysis items. In this case, vehicle OEM should define the reasonable specification and guide of the system level simulation through comprehensive analysis in entire vehicle system. In this point of view, the steering wheel rim mode vibration problem is a good sample to apply system level analysis. This type of vibration can be issued in acceleration and cruse driving condition at 2000~4000RPM if the stiffness of the steering wheel rim is insufficient. In this paper, the contribution of the rim mode was analyzed in the vehicle model and the appropriate target to control the rim mode vibration with equivalent dynamic stiffness was defined in system level through the investigation with vehicle database. Also, steering wheel design guides were proposed to improve the stiffness and weight using the optimization analysis.
실내 음장의 음향 특성을 고려한 승용 차량의 소음 저감 설계 방안
최승찬(Seungchan Choi),오혁진(Hyukjin Oho),황광현(Kwanghyun Hwang),장경진(Kyoung-Jin Chang) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.3
The acoustic cavity in a vehicle’s interior cabin is an important noise transfer path. Therefore, the acoustic modes and transfer functions of a cavity should be considered in reducing interior noise in the early design stages of a vehicle. This paper describes an efficient methodology that can manage the acoustic transfer functions for each boundary surface of the vehicle’s interior cavity. This method, which takes into account the characteristics of acoustic cavity modes, makes it easy to identify the weak frequency range for each boundary surface. Thus, it is useful in the initial design that considers vehicle noise reduction. Furthermore, based on the understanding of the acoustic cavity, noise reduction through an acoustic cavity mode control will be studied. This paper shows the viability of noise reduction through a mode control in the partial shelf and in the trunk.