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- 저자 : 이중혁(Joonghyeok Lee) (검색결과 4 건)
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고속철도차량용 알루미늄 압출재의 차음성능에 대한 폼 충전효과
이중혁(Joonghyeok Lee),박인석(Inseok Park),김석현(Seockhyun Kim) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
The aluminum extruded panel used for a high speed train shows the largest contribution to sound insulation performance of the train body. However, comparing with the flat panel having the same weight, the transmission loss falls sharply in the local resonance frequency band. Such fall of transmission loss can be improved by increasing the damping of local resonance. This study examines the charging effect of an urethane foam on the aluminum extruded panel of a high speed train. We charged the urethane foam with different mass density and in different way in the core part of the extruded panel. We measure the transmission loss and compare the sound insulation performance according to the density and charging method. Finally, Improvement effect of the transmission loss is compared and analysed in aspect of weight increment.
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이중혁(Joonghyeok Lee),이호진(Hojin Lee),박인석(Inseok Park),김석현(Seockhyun Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
The sidewall of the HEMU-400x consists of two parts. One is the multi-layered structure including aluminium extruded panel and the other is the double glazed window. When the train runs in a tunnel, the equivalent sound insulation performance of the side wall significantly influences the internal noise levels. In aspect of the sound insulation strategy, it is important to make two parts have similar performance. In this study, the intensity sound transmission loss (ITL) is measured on the specimens of the two parts. Mass law deviation (MLD) is considered in order to compare the sound insulation performance of the two parts in respect of the weight. Contribution of each part to the sound insulation is analyzed and the sound insulation strategy is investigated to reduce the interior noise.
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김석현(Seockhyun Kim),이중혁(Joonghyeok Lee) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
This study proposes a method of an equivalent bell model in order to tune the beat period of a Korean bell. In a Korean bell having a slight asymmetry, each circumferential mode splits into a mode pair which has a slight difference in frequency, and the interaction of the mode pair makes a beat in vibration and sound. An equivalent bell model which consists of an axi-symmetric bell and an equivalent point mass, has the same mode property as in a real bell. The equivalent bell model is constructed by the finite element analysis based upon the theory of a revolutionary shell Using the equivalent bell model, the beat period is predicted when the bell thickness is locally decreased to improve the beat property. The predicted result is verified by experiment on a test bell. The proposed method is useful to save the time required for tuning the beat period of a large bell.
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박인석(Inseok Park),이중혁(Joonghyeok Lee),안용찬(Yongchan Ann),김석현(Seockhyun Kim) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
철도차량의 차체에는 다양한 재질과 구조의 차음재를 사용함으로써, 외부 소음을 차단하고 실내 정숙성을 유지한다. 일반열차 및 고속열차의 초기 모델에서는 주름강판을 주요 차음재로 사용하고 있으나, 고속 경량화를 위하여 알루미늄 압출재나 알루미늄 허니콤재로 대체되고 있다. 이러한 요소와 함께, 합판과 노멕스 허니콤, 유리면도 적층 요소로 사용된다. 또한 차제의 측면에는 라미네이트 복층 유리창이 소음의 전달 경로가 되므로 그 차음특성이 중요하다. 이러한 요소들은 각각 상이한 면밀도를 가지며, 그 차음 메커니즘이 다르다. 본 연구에서는 다양한 차음재를 대상으로, ASTM E2249-02에 근거한 투과손실을 측정하고, 질량법칙 편차(MLD)를 이용하여 중량대비 차음성능을 비교 평가한다. Various material and structures are used in a railway vehicle in order to insulate the passenger compartment form the exterior noise sources. Normal train and early model of the high speed train use the corrugated steel panel as a main sound proof element, however, the steel panel is replaced by aluminum extruded panel or aluminum honeycomb structure for the weight reduction. With these elements, plywood, nomex-honeycomb and glass wool are widely used in the layered structure of the body. Also, in the side wall of the train, double glazed window made of the laminate glass is the major noise transmission path and the sound insulation performance is very important. In this study, we measure the intensity transmission loss on these sound proof elements of the train, based upon ASTM E2249-02 and we compare the sound insulation performance per weight using the mass law deviation (MLD).
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