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서태건(Taegun Seo),김석현(Seockhyun Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In a Korean tilting train, honeycomb composite panel is used for high speed and light weight. Side wall of the tilting train consists of the aluminum honeycomb coated with carbon fiber reinforced epoxy skin as the main structure. In this study, based on ASTM E2249-02, we measure the intensity sound transmission loss (TL) of the honeycomb composite panel. Using mass law deviation (MLD), we estimate the sound insulation performance of the honeycomb composite panels in aspect of weight and feel out the feasibility of the substitution for the conventional corrugated steel panel.
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.