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고성능 및 친환경 차량의 복합재 브레이크 안정감 향상을 위한 스퀼 노이즈 강건성 분석에 관한 연구
심재훈,이중희,신웅희,임동원,현은재,전태형,Shim, J.H.,Lee, J.H.,Shin, U.H.,Lim, D.W.,Hyun, E.J.,Jeo, T.H. 한국자동차안전학회 2021 자동차안전학회지 Vol.13 No.3
Composite material is very attractive because it has excellent mechanical property and is possible to lightweight due to the low density. However, composite material is less used compared to other systems in the chassis system because it is very hard to solve NVH problem when composite material is applied to vehicle. Especially, reducing squeal noise of composite brake system is essential to apply it to vehicle successfully. In this paper, we present a new solution to reduce squeal noise of composite brake system. To achieve this goal, we analyze main causes of noise using RCA (Root Cause Analysis), CA (Contradiction Analysis) and sequentially get IFR (Ideal Final Result) to solve the problem. Next, we define the function of composite brake system and derive control factors and noise factors. A variety of tests for factors like chamfer, slot, damping shim, underlayer of brake pad are done. In addition, we analyze level of contribution for control factors theoretically. Finally, we get the effective solution for reducing squeal noise.
제동성능 고급화 인자 분석을 통한 복합재 제동시스템 개발에 관한 연구
심재훈,신웅희,이중희,황세라,임원석,김병철,임동원,현은재,이재만,김홍기,Shim, J.H.,Shin, U.H.,Lee, J.H.,Hwang, S.R.,Yim, W.S.,Kim, B.C.,Lim, D.W.,Hyun, E.J.,Lee, J.M.,Kim, H.K. 한국자동차안전학회 2020 자동차안전학회지 Vol.12 No.1
The luxury car market has been steadily growing for the last 10 years and it might keep expanding in the future. Furthermore, it is expected to be a very competitive market because luxury cars are considred to reflect the technology level of motor companies. For this reason, it is very important for motor companies to improve performances of luxury vehicles. However, it takes years for the companies to increase the technology level for the high performances. In this paper, we aim to analyze the technologies for high quality brake perfomances through investigation of two luxury vehicle models and develop a new high performance brake system. First, we found out a variety of effective factors for the high performances. Second, we conducted the brake performance analysis to figure out the relationship between brake effort and brake feeling. Finally, we develped the new brake system using carbon ceramic composite materials to satisfy the high quality brake performances.
열부하 및 회생 제동 특성을 고려한 경형 친환경차의 제동시스템 개발에 관한 연구
심재훈,신웅희,이중희,황세라,임원석,김병철,Shim, J.H.,Shin, U.H.,Lee, J.H.,Hwang, S.R.,Yim, W.S.,Kim, B.C. 한국자동차안전학회 2020 자동차안전학회지 Vol.12 No.2
Recently, there is a big issue of downsizing on brake system according to fuel efficiency and regenerative braking cooperation control. Especially, small cars have improved in a variety ways such as electric vehicle and smart car compared to previous small cars. So, small brake system is strongly required in the car industry. A new small brake system for light compact vehicles was proposed in this paper. For this system, the solid type disc and caliper were newly developed. And the important design factors were considered to reduce brake size. First, we calculated the temperature rise of disc through heat capacity formula and CAE analysis. Second, we analyzed the housing and carrier stiffness of caliper to select the reasonable condition. Finally, the superiorities of the developed brake system were verified by heat capacity, consumption liquid level, braking feeling, judder, wear test and regenerative braking cooperation control analysis. A developed brake system is expected to be useful for brake system of light compact platform.
Diesel 기관의 미립자와 NOx 동시저감에 관한 연구
오영택(Y.T.OH),이중희(J.H.Lee),유경현(K.H.Ryu),최승훈(S.H.Choi),김정기(J.K.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
This paper is concerned with the effects of oxyaenated fuel on exhaust emissions.<br/> An Experiment was conducted to investigate the PM and NOx emissions by using dimethyl carbonate as an oxygenated fuel in a naturally aspirated DI diesel engine.<br/> With increased oxygenated fucl amounts, mainly from depressed thermal cracking there were significant reductions in PM, HC and CO emissions, while a smal increase in NOx was encountered concurrently.<br/> The effective reduction in PM with oxygenated fuel was maintained with the presence of CO₂, which suggested a low NOx and PM could be obtained in combination of using Oxygenated fuel and cooled EGR.<br/>