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강영춘(Youngchun Kang),장진만(Jinman Jang),김준완(Junewan Kim),김영수(Youngsoo Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Idle vibration, hot issue of the NVH problem has been studied for a long time. Engine excitation is the source of the idle vibration and Engine mount system, drive line and suspension system are main force transfer paths to the body. To predict the idle vibration performance in the beginning or prototype of a car developing program is very important process and therefore building the CAE model for idle vibration analysis became one of the most important works of car maker. The CAE model must have the force transfer systems that are mentioned before such as engine mounting system, drive line and exhaust system for the real situation. In this paper, CAE model for idle vibration analysis is validated by comparing test results from the bench made for the experiment testing a specific character of transfer systems in particular. Also, this CAE model is very useful in order to improve idle vibration performance in the level of chassis system.
점성-대류 음향 방정식과 비 도플러 알고리즘을 이용한 배기계의 소음 성능 예측에 관한 연구
장진만(Jinman Jang),강영춘(Youngchun Kang),김기동(Kidong Kim),김준완(Junewan Kim),김영수(Youngsoo Kim),김중희(Joonghee Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, the noise of vehicle is the one of the key factors for customers to purchase a vehicle and the most important part which is related to the noise is the exhaust system. Thus, car makers have their own ways to assess this exhaust noise not only to decrease the level of noise but to enhance the feeling of it. Typically, to do these things in the early stage of development, the tuning code of the exhaust system has to be made by CAE tool, which is very reliable but expensive, and the prototype parts of this code would be made for the validation test. Then this process can be iterated to meet the target of the performance. In this study, a new algorithm which adapts the ‘convective sound wave theory’ and ‘anti-Doppler effect’ has been introduced and with this algorithm, a calculation code for sound field estimation has been developed. And for the validation of the calculation code, various comparisons and validations were carried out with the result of wind tunnel test. Also the comparison with other CAE tool has been performed for the validity and the improvement of the new calculation code could be achieved.
엔진 마운팅 및 배기 시스템의 동역학적 특성계발을 위한 시스템 벤치의 연구
장진만(Jinman Jang),강영춘(Youngchun Kang),김준완(Junewan Kim),김영수(Youngsoo Kim),김중희(Joonghee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
It is very important to understand the dynamic characteristics of a vehicle like idle vibration, key on-off, and engine shake in the early stage of the projects before the prototype could not be prepared yet. Also, if there is no enough validation on the design of these performances, this can cause large changes in the engineering later on. Therefore, it is worthwhile to study a new method to validate the dynamic performances in early stage of engineering before advancing to the next stages. In this study, a system bench for the low frequency vibration simulation is introduced for the prediction and validation of power train and exhaust system dynamic performances. The system bench was built to have equivalent dynamic characteristics of the vehicle and power train system, and various comparisons and validations were carried out with CAE and vehicle test results so that validity and improvement points of the bench could be achieved.
중형 트럭 KEY ON/OFF 시 엔진 마운팅 진동 해석
국종영(Jongyoung Kuk),문일동(Ildong Moon),강경완(Kyungwan Kang),현상학(Sanghak Hyun),강영춘(Youngchun Kang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The vibration of a vehicle, which is caused by and transmitted from the engine, has significant effect on the ride comfort and the dynamic characteristics of the engine mount system have direct influence on the vibration and noise of the vehicle. This paper examines the body shake caused by the engine excitation force on engine key on/off of a heavy truck by experiment and simulation. The analysis model consists of the engine, body including frame, front and rear suspensions and tires. The force element between body and suspension is modeled as a combination of suspension spring and damper, and the unsprung mass has roll and pitch. The engine shake obtained from experiment was compared with the result of computer simulation, and by using the verified computer model, parametric study of the body shake on engine key on/off is performed with changing the stiffness of engine mount rubber, the engine mount angle, and position of engine mounts.