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김국선(Kooksun Kim),김민지(Minji Kim),김중희(Joonghee Kim),송정효(Jeonghyo Song),신중배(Jungbae Shin),윤종현(Jonghyun Yun),최보아(Boah Choi) 한국가구학회 2015 한국가구학회지 Vol.26 No.1
There is an increasing trend each year in the number of subway users due to increase in the traffic volume. As the number of train service has risen, the subway drivers are given heavy work and from the same, are put at risk of mental health deterioration due to stress. As this is directly connected to safety, there is an urgent need for improvement of the situation. Therefore, as a way to appropriately relieve such stress, resting space where mental and physical energy can be recharged is necessary. Thus, this research conducted a survey of demand with subway drivers as subjects in order to provide resting space that can offer healthy rest and increase work effectiveness. 50 subway drivers were the subjects of this survey. As a result of analyzing the contents of the survey, environmental satisfaction was shown to be the lowest compared to psychological and morphological satisfaction. In the case of sleeping room, they wanted more comfortable and individual space. And the waiting room had the highest rate of usage frequency. The storage space was where the subway drivers showed the strongest attachment and was shown to be the only personal space. Most were shown to be satisfied with the outdoor space, but it had the lowest usage frequency. In addition, it is nessasery customized storage cabinet designed for subway drivers should be produced, which can effectively arrange the limited space. I hope that these direction of improvement can increase the healthy rest and work effectiveness of the locomotive engineers as it is directly being connected to the health and safety of the citizens.
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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.
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구조기구조기인 아이들 소음 저감을 위한 차체 골격 내 복합체 삽입 최적설계
김효식(Hyosig Kim),윤성호(Seongho Yoon),김중희(Joonghee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
As a matter of fact, it has been difficult to modify the shape of vehicle body skeletons since the technical definition for a global body structure was fixed and the corresponding molds were developed. By the way, if it is available to apply an alternative to reinforce the skeletons without changing their molds, it will be more flexible to improve the performance qualities relevant to crash, durability and NVH(Noise, Vibration and Harshness). Recently, a solution with the composite body becomes available for the purpose. We present an optimal design method to insert the composite bodies into a vehicle body skeleton in order to improve the structure-borne noise at the idle condition. The algorithms, topology optimization and gradient based optimization, are applied to mainly search the sensitive structural joints in the body skeleton and to extract the technical definition of composite body insertions. Inserting the composite bodies into the sensitive joints, it is predicted to achieve the countermeasure which can meet the design availability in terms of the idle noise and the weight. According to the validation result with test vehicles, the concerned noise transfer function is reduced and the idle booming noise is resultantly improved.
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3차원 대류 파동 방정식과 도플러 알고리즘을 이용한 배기계의 소음 성능 예측에 관한 연구
장진만(Jinman Jang),김준완(Junewan Kim),김중희(Joonghee Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
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 ‘3 dimensional convective sound wave theory ‘and ‘Doppler effect’ has been developed. With this new algorithm, a brand new system for the calculation of tail pipe noise has been developed and validated by acoustic wind tunnel test. As a result of this study, various comparisons and have been carried out, for example, the comparison with other CAE tool has been performed for the validity and the improvement of the new calculation code could be achieved.
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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.
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