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파워기반 소음감소 기법을 이용한 준중형 해치백 후석 고주파성 로드노이즈 전달특성 연구
이종현,조세현,이주완,이철현,양정민,Lee, Jonghyun,Cho, Sehyun,Yi, Juwan,Lee, Chulhyun,Yang, Jungmin 한국음향학회 2018 韓國音響學會誌 Vol.37 No.4
세단 타입에 비해 해치백 타입의 차량은 실링구조 확보에 어려움이 있기 때문에 후석에서 느껴지는 차폐성능이 열세한 것으로 알려져 있다. 차량의 차폐감 확보를 위해 강건한 실링 시스템과 충분한 흡음/차음 성능이 요구되지만 준중형 이하 세그먼트에서는 원가, 중량의 제약으로 인해 충분한 흡차음 사양 적용에 제한을 받고있어 효율적인 흡차음 사양의 적용이 요구되고 있는 실정이다. 본 연구에서는 정량적인 측정과 비교, 분석이 가능한 파워기반 소음감소(Power Based Noise Reduction, PBNR) 기반의 차음 윈도우 평가를 통해 준중형 해치백 차량의 후석 소음원의 전달 경로를 분석하고 후석 차폐성능 확보를 위한 흡차음 대안을 제시하였다. It is known that the road noise on the rear seat of a hatchback type car is worse than that of a sedan type car because of the weakness on sealing structure. Therefore, a sound sealing system and sufficient absorption/insulation performance are required. In the case of a compact segment car, however, the application of the sufficient absorption and insulation materials is limited, because of the restriction on the production cost and weight of the car. In this study, we estimate the noise transmission path on the vehicle's body structure from tires and ground using the PBNR (Power Based Noise Reduction) method which is useful in quantitative measurement. Based on these results, we suggest an alternative absorption/insulation method for the better performance of rear seat road noise reduction in a compact hatchback car.
다물체 동역학 프로그램을 이용한 차량쏠림 Simulation
이정환(Jung-Hwan Lee),이주완(Juwan Lee),김남전(Nam Jeon Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
During normal operating condition, constant disturbances from several sources are acting on vehicles. These disturbances come from external sources like wind and road crown, or internal sources like tires, suspension and chassis. The disturbances from these sources pull a vehicle in the lateral direction during straight-ahead motion. Studied in this paper was the effect of road crown, tires, and suspension on vehicle straight-ahead motion using a multibody dynamics program. Effect of each variahle on straight-ahead motion was evaluated from the simulation results of straight-ahead motion during 100 m run under free control mode. In addition to this, vehicle behavior during straight-ahead motion under fixed control mode was also examined.
이정환(Jung-Hwan Lee),이주완(Juwan Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
It is called vehicle pull when a vehicle drifts in the lateral direction under the straight-ahead motion with no steering or external input. Recently vehicle pull draws attention as one of the critical evaluation items from the customers on the vehicle quality. It is generally recogni7.ed that the vehicle pull is complex phenomena due to internal and external factors. In this paper, the relations between vehicle pull and tire were investigated through the vehicle tests and close survey on the road test results for final inspection in car manufactures. Through this investigation. the factors are identified which play an important role in causing vehicle pull problem.
썬루프 디플렉터 각도에 따른 썬루프 개구부 주변 유동 특성 연구
이성원,신성룡,최의성,이주완,Lee, Sung Won,Shin, Seongryong,Choi, Eui Sung,Yi, Juwan 한국음향학회 2018 韓國音響學會誌 Vol.37 No.5
본 연구에서는 차량에 장착되는 파노라마 썬루프 디플렉터의 각도에 따른 개구부 주변 유동 특성을 분석하고 공력소음에 미치는 영향을 확인하였다. 파노라마 썬루프 개방 후 주행 시 공력소음을 저감하기 위해 메쉬 디플렉터를 장착하는데, 후방향인 기존 메쉬 디플렉터 각도를 전방향으로 변경하였을 때 유동 변화와 공력소음 기여도를 분석하였다. 이를 위하여 CAT(Computer Aided Test)와 실차 풍동 평가를 진행하였으며, 전방경사형 디플렉터에서 기존 디플렉터 대비 원활한 유동의 흐름과 유동 방향의 상향으로 공력소음이 개선되는 것을 확인하였다. 전방경사형 디플렉터 적용 시 동등한 원가에서 공력소음을 개선할 수 있을 것으로 기대된다. In the present study, flow characteristics and wind noises around the sunroof opening are analyzed variation with panoramic sunroof deflector angle. A mesh deflector is attached to reduce wind noise while a car is driving with the panoramic sunroof opening. A new forward inclined type deflector was invented to improve wind noise. The effect of this new concept of mesh deflector on the open-panoramic flow characteristics and wind noises were studied with CAT (Computer Aided Test) and wind tunnel test, which shows the reduction of open-panoramic wind noises such as sunroof buffeting, sunroof booming, and turbulent noise. Therefore, the forward inclined type deflector can efficiently improve wind noise with the same production cost.