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채기상(Ki-Sang Chae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Statistical Energy Analysis (SEA) is a nearly unique method to predict vehicle airborne interior noise in the mid and high frequency range at present, and after about the year of 2000, SEA has been one of the effective CAE tools in the global automotive industry. In this paper, a process of building a vehicle model to predict airborne interior noise is described: vehicle modeling, material data preparations and correlation efforts for material level, component level, and vehicle level. Even though full correlations were not made for material and component level, in vehicle level, there were strong similarities between the predicted and the measured vehicle interior noise. It seems that SEA could be an effective CAE tool to deal with the vehicle airborne noise in early stage of vehicle development.
채기상(Ki-Sang Chae),최정순(Jeongsoon Choi),염성우(Sung Woo Yeom),이승(Seung Lee),남궁재균(Jaekyun Namgung) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In order to develop the vehicle insulation performance efficiently in the view point of weight and cost, it is necessary to perform detailed studies for the insulation performances of a current production vehicle’s major panels in the predevelopment stage of a successor vehicle. In this study, the insulation performances of dash and floor system are experimentally studied for a sedan vehicle which is sold in the market (production vehicle). A window method is applied in order to estimate the sub-regional insulation performances and the individual insulation performances of dash pass-throughs. The weak paths of dash and floor are checked one by one by using the window method and sound intensity maps. Simulation models are developed based on the above experimental results, by which the insulation performance of each system could be predicted precisely. Finally, design studies are performed using the simulation models for a successor vehicle development.
채기상(Ki-Sang Chae),박철민(Chul-Min Park),이인직(In-Jik Yi),김상모(Sang-Mo Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Vehicle interior noise above 500㎐ is usually controlled by sound package parts. The materials and geometries of sound package parts directly affect on this high frequency noise, so those effects should be simulated. In this study, Statistical Energy Analysis (SEA) is utilized to simulate the design change effects of sound package parts for a CUV vehicle. Using a commercial SEA simulation tool, a SEA vehicle model is built and validated for idealized acoustic excitations, and the validated model is used for wide open throttle (WOT) condition. Design changes of 7 sound package parts are considered, and their effects on Articulation Index (AI) are analyzed using a DOE approach, and optimal design alternatives are chosen. Finally, through several vehicle tests it is proved that AI can be improved with decrease of weight and cost with aid of SEA approach.
차량 대시구조 차음성능에 대한 실러 적용 효과의 시험 분석
채기상(Ki-Sang Chae),유지우(Ji WooYoo),이상우(Sang-woo Lee),이승(Seung Lee) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Sound insulation performance of vehicle dash system is determined by a superposition of the performances of panel, sealer, vibration deadner, sound package, and pass-throughs. Up to now, the sealer treatment"s effects on insulation performance of dash are not clear. Therefore, it is difficult to include these effects in virtual development phase. In this paper, the sealer’s effects are experimentally studied in the viewpoint of Sound Transmission Loss (STL) of dash structure. A test structure of vehicle dash is prepared for the measurement of STL. The locations of sealer treatment are classified into a few characteristic regions, and STL measurements are performed under various conditions of sealer treatment. Additionally, experiments for vibration deadener" effects are also performed and compared to the results of selaer treatement. The summary of the experiments are as following: 1) STL of dash structure without sealer treatment is lower as much as 9 dB in the high frequencies such as above 1kHz, compared to maximum sealer treatment. 2) For locations of sealer treatment, the compartment-side is more important compared to the engine room-side. 3) For the case of dash panel with a large flat reinforement, at which air gap exists between dash panel and reinforcement, the sealer treatment along the edge of the reinforcement could contribute to the enhancement in STL. 4) Compared to the application of sealer treament, application of vibration deadener has a small sensitivity in STL in the high frequencies.
엔진룸 음향모드 제어를 통한 부밍대역 공기기인소음개선 연구
서민규(Minkyu Seo),채기상(Ki-Sang Chae),김대운(Daewoon Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The reduction of vehicle booming noise was conducted normally in the area of structure borne sound or intake and exhaust sound. This paper investigated the application of the Helmholz Resonator to control the acoustic mode of the engine room. The acoustic FEM and acoustic BEM techniques were examined on the cavity mode analysis. Generally the acoustic FEM is applied to the closed volume like the passenger room and the acoustic BEM to the open volume. The engine room is connected to the outer volume through the grill in the front area and through the drive line and the exhaust pipe in the rear area. This paper used the acoustic FEM technique, took the engine room and the proper exterior open volume. Considering the acoustic boundary conditions, acoustic modes was calculated and visualized. The three dimensional visualized mode gave us good results when compared with the experiment and the acoustic BEM technique. The three dimensional visual of the cavity mode gave us the optimal position of the resonator. By taking the proper shape of the resonator, the airborne booming sound was reduced at the test vehicle of high speed.