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이남훈(Namhoon Lee),윤재원(Jaewon Youn),이정근(Jungkeun Rhee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
GM Korea has developed new CVT mini vehicle reflecting customers concerns about low fuel economy at high speed and lack of power in the current AT vehicle. Currently adopting CVT system is increasing due to following reasons. 1) CVT can provide better fuel economy than AT by enabling the engine to run at its most efficient rpm for a range of vehicle speeds and continuous gear ratio change. 2) It can be used to maximize the performance of a vehicle by allowing the engine to turn at the rpm at which it produces maximum torque and power. 3) It is more comfortable than AT by minimizing shift shock with continuous gear ratio change. But additional N&V issues, result in weight increase compare with AT, should be treated and optimized well. During the CVT vehicle development, rumble noise in vehicle interior was issued. Generally main source of rumble noise is crankshaft and powertrain bending but main contributor is structure-born noise transferred by engine and transmission mounting system. Rumble noise is problematic if mounting system design is not optimized for the powertrain vibration mode or it can’t minimize or amplify the powertrain rumble vibration. This paper shows root-cause of rumble noise and its improvement process which appeared in the CVT vehicle development process. Applying Red-X method, WOW BOB vehicles were chosen to compare the noise level difference and to estimate contribution and improvement potential of each component and N&V test have been carried out for these selected items.
이남훈(Namhoon Lee),백승목(Seungmok Baek),박원식(Wonsik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
GMDAT has developed new EU5 2.0 and 2.2 liter L4-cylinder turbocharged diesel engines that have improved power, lower exhaust gas emissions and better NVH performance compared to the previous EU4 engine. Nowadays customers want not only performance and fuel economy but also better NVH performance. To satisfy these consumer expectations, GMDAT set the NVH target as best in segment and to meet this target, engine hardware as well as combustion noise have been improved at each stage of engine development process. This paper will describe the NVH development process of the engine, including target setting process from benchmarking, NVH improvements of engine components and solutions for quality issues during development process.
정남훈(Namhoon Chung),이우택(Wootaik Lee),선우명호(Myoungho Sunwoo),이영재(Youngjae Lee),엄명도(Myoungdo Eom) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.2
Emission from road traffic is one of the major sources of air pollution, and provides some undesirable effects the atmospheric environment and human health. In the city of Seoul, the higher portion of diesel vehicles runs compared with that of other countries. Emission from the diesel vehicles is much higher than that of other vehicles. In this study, the driving pattern of city-bus in Seoul is investigated through on-road vehicle test and compared with the test modes of other countries in order to examine appropriateness of the present test mode that is taken in our country.
류남훈(NamHoon Ryu),반경진(KyeongJin Ban),김경옥(KyeongOg Kim),오경숙(KyeongSug Oh),이혜미(HyeMi Lee),이상진(SangJin Lee),김응곤(EungKon Kim) 한국통신학회 2009 한국통신학회 학술대회논문집 Vol.2009 No.6
컴퓨터 그래픽스 기술을 접목한 디지털 영상 콘텐츠 산업이 점차 증가하면서, 해저환경을 비롯한 다양한 분야의 콘텐츠가 개발되고 있다. 해저환경을 표현함에 있어서 가장 핵심인 어류의 자연스러운 움직임을 표현하는 방법으로 핵심이 되는 몇 개의 프레임을 제작 후 이 프레임들의 값들을 참고하여 중간 프레임을 산출하는 방법이다. 본 논문에서는 이 방법에 진자개념을 적용하여 사인곡선을 그리며 움직이는 꼬리의 움직임을 표현함으로써 자연스러운 어류의 움직임을 표현하고자 한다.
정남훈(Namhoon Chung),이우택(Wootaek Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.1
Vehicle emission is one of the major sources of air pollution, and provides some undesirable effects on the atmospheric environment and human health. In this study, the driving data were recorded during road tests in Seoul metropolitan area, and analyzed by statistical techniques. The objective of the study is to analyze the driving patterns of passenger car that influence on emissions in urban driving. The results show that the average speed is around 29.9km/h, and the average fuel economy is 10.23 km/ ?? . The vehicle speed of Seoul metropolitan area is slower, and the stop-and-go operation is more frequent than CVS-75 test mode which is used for emission and fuel economy test.Vehicle emission is one of the major sources of air pollution, and provides some undesirable effects on the atmospheric environment and human health. In this study, the driving data were recorded during road tests in Seoul metropolitan area, and analyzed by statistical techniques. The objective of the study is to analyze the driving patterns of passenger car that influence on emissions in urban driving. The results show that the average speed is around 29.9km/h, and the average fuel economy is 10.23 km/ ?? . The vehicle speed of Seoul metropolitan area is slower, and the stop-and-go operation is more frequent than CVS-75 test mode which is used for emission and fuel economy test.
승용차용 재제조 시동전동기의 신뢰성 향상을 위한 성능평가시스템 개발
정남훈(Namhoon Chung),이한홍(Hanhong Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recent settlement of the industrial society of mass production and mass consumption brings about an exhaustion of natural resources and global warming. Therefore, various researches are under way for the pursuit or economic growth and environmental protection at the same time. For example, directive on ELV went into effect on January 2006 in EU in order to increase the reuse and recovery rate for vehicles. In our country, the resources circulation law of automobile is established for the promotion of reuse of automotive components and effective on January 2008. In this paper, remanufacturing, which is one of the reuse of automotive parts, is introduced and performance evaluation system of the remanufactured starter motor is proposed for the quality certification.