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SEA와 FEM 기법을 이용한 제진재의 위치 최적화에 대한 연구
신용우(Yongwoo Shin),권용상(Yongsang Kwon),최진호(Jinho Choi) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
In the process of the vehicle development, the damping material, especially sound deadener application is mandatory in modern vehicles for vehicle noise and vibration performance. But it should be balanced considering cost and mass. This study focuses on optimal positioning of sound deadener for the reduction of vehicle interior noise at most in the limited mass considering target performances. For the optimal positioning of sound deadener, we have performed the location optimization of sound deadener for reducing interior noise based on energy contribution analysis and topology optimization using SEA as well as FEM. Through the analysis and optimization, we have obtained the optimal location of the sound deadender for the application, and finally verified the noise reduction by performing the road noise analysis.
전기자동차 LASD(Liquid Applied Sound Deadener)최적화
김준우(Junwoo Kim),권용상(Yongsang Kwon) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In the auto industry, vehicle development process and direction mainly have been focused on internal combustion engine vehicle. But nowadays, due to the depletion of fossil-based fuel and environmental problem, hybrid vehicle is getting common and furthermore battery electric vehicle (EV) is dawning in the auto industry. In case of EV, noise source location and frequency is different from combustion engine (ICE) vehicle and even more vibration source is much lower. Even if dominant engine source is disappeared, new drive unit tonal noise characteristic is occurred and tire-road noise and wind noise are more easily able to sense than combustion engine due to reduction of engine masking effect. So EV NVH development strategy also should be discriminated with ICE. Especially NVH acoustic package strategy perspective, which is focus on combustion engine vehicle is not appropriate for the EV. Therefore, EV needs new acoustic package according to EV specific noise characteristic. The main object of this paper is to introduce EV acoustic package development process in virtual vehicle. Mainly, vibration damping sheet (LASD) and absorption/insulation material were optimized. Topology optimization and DFSS were used as a tool.