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디젤 엔진 Gear Box의 Whining noise 저감에 대한 연구
조성용(Sungyong Cho),김철구(Chulgoo Kim),김민철(Mincheol Kim),김상우(Sangwoo Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Recently, Emission regulation for automobiles has become stricter as people are being more aware of the importance of air-pollution. Therefore, automobile manufacturers are paying close attention towards after-treatment technologies in order to improve efficiency to fulfill these requirements. Due to this factor, high firing pressure in cylinder and optimization of timing system are becoming more relevant these days. The development of this new technology causes a new problem to arise as it produces an increased whining noise in engine gear box. As a result of the importance to cause this problem, this paper presents case study about reduction of whining noise in gear box by experimental and analytical method that include ODS(operational deflection shape) and FEM analysis.
이종범(Jongbum Lee),조성용(Sungyong Cho),백춘호(Chunho Baek) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Transmission loss of automotive muffler was measured and predicted by CAE, GT-Power which is based 1-dimension equation. Two load method to find 4-pole parameters of transfer matrix was used and basic characteristics of simple elements-straight pipe, expansion chamber, extended type, absorption material and perforated pipe was investigated. Simultaneously with it, CAE analysis by CT-Power was performed and compared with test result. It was found that the two load method is appropriated to measure TL of automotive muffler and CAE analysis also has reliability compared with test result. Finally, TL of a number of complete automotive mufflers measured and compared with analysis result. The possibility of two load method and CAE analysis to measure or predict TL performance of muffler was verified.
엔진 구동계 크랭크샤프트 피로강도에 대한 축계 진동의 영향성 검증
김민철(Mincheol Kim),조성용(Sungyong Cho),김철구(Chulgoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Driving system which is one of the main system of engine consists of dynamic components and have significant influence on engine performance. Recently emission control has been more and more tightened up and engine makers have prepared for countermeasure to deal with it. Increase of firing pressure in cylinder can be considered as one of the effective alternatives for it, but this has strong influence on the strength and vibration of components of driving system. Crankshaft which delivers power to the transmission and vehicle is the most critical component among them and so must be robustly designed to have sufficient durability and stable vibration characteristics. In this study the influence on crankshaft fatigue strength by vibration due to increase of firing pressure in cylinder and inertia load is predicted by analytical method and validated by real measurement.