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서태건(Taegun Seo),김석현(Seokhyun Kim),김정태(Jung-tae Kim),김재철(Jaecheol Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
In a railway vehicle, corrugated steel panel is widely used for the floor structure because of its high bending stiffness and light weight. However, this panel shows lower sound insulation performance than that of the plate with the same weight. Especially, in a particular frequency region, transmission loss (TL) rapidly decreases and it results in the deterioration of TL of the overall floor structure. This study identifies that the remarkable drop in TL is caused from the local resonance of the periodic corrugated structure. The reason of the TL drop is investigated by experiment and finite element analysis. In addition, improvement effect of TL by the design modification of the corrugation is estimated by experiment. The purpose of the study is to provide the practical information for the improvement of the sound insulation performance of the corrugated steel.
서태건(Taegun Seo),김석현(Seockhyun Kim),김정태(Jeong-tae Kim),송달호(Dalho Song) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Aluminium extruded panel is the most important element for sound insulation in a express train. However, comparing with the flat plate with the same weight, the extruded panel shows remarkably low sound transmission loss above the 1st local resonance frequency, which is determined by the dimension of the core structure. Preceding study showed the possibility of the improvement of sound insulation performance by properly designing the core dimension. By the proper core design, local resonance frequency shifts to higher frequency region without any reduction of bending or torsional strength and without any weight increase. Based upon this result, this study investigates in detail the design modification of the core structure of the aluminium extruded panel used in a express train under development, in aspect of sound insulation. Design result is compared with those of other developed models.
서태건(Seo Taegun),김석현(Kim Seockhyun),김정태(Kim Jeong-tae),송달호(Song Dalho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Recently, aluminium extruded panel is widely used in a high speed train for increasing bending stiffness and weight reduction. This aluminium extruded panel shows the largest contribution in the sound transmission loss (TL) of the floor and side wall. However, comparing with the flat panel having the same weight, TL of the aluminium extruded panel falls remarkably around the local resonance frequency, which is determined by the dimension of the core structure. In this study, we try to change the local resonance frequency by modifying the core structure. Increasing or decreasing the thickness, angle and span in the core, change of the local resonance frequency and change of the overall natural frequency are investigated by finite element analysis, and effect of local resonance on TL is examined. The purpose of the study is to design more effective core structure for the sound insulation performance of the aluminium extruded panel.