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차량의 공력 소음에 대한 품질지수 추정을 위한 손실함수 연구
김중한(Jounghan Kim),오혁진(Hyukjin Oh),김달식(Dalsik Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Recently, passenger vehicle manufacturing companies are endeavoring to improve noise control technologies very much. Among them, the wind noise has been highlighted as a main ingredient of interior noises owing to passenger vehicle performance improvement. Passenger vehicle industries are doing efforts so as to enhance passenger vehicle wind noise performances of excellent quality for satisfying customer’s needs on it. This study is aimed to develop a wind noise loss function intended for customer satisfaction prediction from based on vehicle interior noise levels, and loss function play a fundamental role in every quality engineering method. Also, Loss function of wind noise and initial quality index is a reasonable approach method to design concept development, excellent initial quality, and robust in the wind noise performance development of vehicle.
차량 공력소음에 대한 주관평가와 계량적 접근 방법의 상관관계
김중한(Jounghan Kim),오혁진(Hyukjin Oh),김달식(Dalsik Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Wind noise has been highlighted as one of main ingredient of interior noises and shows important customer issues steadily. So in the automotive industries are doing efforts to enhance wind noise performance of excellent quality for satisfying customers’ needs. In general wind noise consist of rush noise, leak noise, buffeting noise, hoot noise etc. Each component shows different sound characteristic depend on what is sound source. And this sound characteristic could be classified with several sound metrics such as articulation index, loudness, sound pressure level and so on. This paper is aimed to investigate which sound metric is well correlated with subjective evaluation especially focused on rush noise and leakage noise. For the correlation function study, regression analysis method is used.
승용 자동차 공력 소음에 대한 A-필러 앞 모서리의 반경 연구
김중한(Jounghan Kim),김용년(Yongnyun Kim),강선제(Sunje Kang) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
Flow separation surrounding the A-pillar of passenger vehicles is the main cause behind aerodynamic noise and surface pressure fluctuations, and, because aerodynamically-occurring wind noise negatively affects the comfortability of the passenger, the automobile industry is recently working hard to improve the wind noise performance of passenger vehicles in order to satisfy consumer demand. In particular, it is important to improve the turbulence surrounding the A-pillar in the initial design stage and reflect this into the exterior design in order to develop a sound quality that consumers want. From an engineering standpoint, the exterior design is impossible to alter after the performance development stage, and thus, it is important to predict the aerodynamics and the level of wind noise at the initial design stage. Out of the many exterior designs, the present study applied a vehicle development process by optimizing the shape of the Apillar leading edge, in particular, through the use of computational fluid dynamics and clay models to achieve the development of wind noise for the passenger vehicle.
에올리아 순음 방지를 위한 승용차용 루프랙 크로스바 디자인 개발에 관한 연구
김중한(Jounghan Kim),강훈식(Hunsik Kang),강선제(Sunje Kang) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
The demand for SUVs and RVs has rapidly increased due to the growth of various leisure sports populations, the roof rack has become a very popular accessory. However, flow separation around the crossbars of the roof rack is a major cause of aerodynamic noise and pressure fluctuations, and Aeolian tone, described as low frequency howling, is one of the wind noises that always leads to complaints if not mitigated, negatively affecting customer comfort. Reducing wind noise is one of the major concerns in the automotive industry, and with the development of electric cars and autonomous driving, passengers will be exposed to more wind noise. The purpose of this project is to provide a crossbars section of the roof rack in the initial design stage by using computational fluid dynamics to analyze the turbulent flow around the crossbars and reduce the Aeolian tone generated around the crossbars.