PROBLEM TO BE SOLVED: To provide a sound absorption structure by a vehicular trim material that can realize excellent sound absorbing performance over a wide range of frequency domains from high frequency domains to low frequency domains, and that is preferable for preventing weight increase and cost increase of the vehicular trim material itself.SOLUTION: A vehicular trim material 1 attached to the inside of an automotive body panel 2 includes, as a means for forming an air space 3 needed for acoustic absorption by resonance between the automotive body panel 2 and itself, a hole-opened board 5 having a plurality of pieces of open hole 4, and has a structure that, on a face 5A in the side facing the car interior between both surfaces of the hole-opened board 5, an air permeability material 6 that functions as acoustic absorption control material and car-interior decorative material is stuck. By setting the ventilation resistance value of the air permeability material 6 to a predetermined value, air movement in the open hole 4 is controlled, thereby expanding frequency domains for which acoustic absorption is possible.SELECTED DRAWING: Figure 1
【課題】高周波領域から低周波領域に亘る広範な周波数領域で優れた吸音性能が得られ、また、車両用トリム材自体の重量増加やコストアップを防止するのに好適な、車両用トリム材による吸音構造を提供する。【解決手段】車体パネル2の内側に取付けられる車両用トリム材1は、共振による吸音に必要な空気層3を車体パネル2との間に形成する手段として、貫通孔4を複数形成してある孔開きボード5を備えるとともに、この孔開きボード5両面のうち車内に臨む面5A側に、吸音制御材及び車内装飾材として機能する通気性素材6を貼付した構造になっていて、通気性素材6の通気抵抗値を所定値に設定することにより、貫通孔4内での空気移動を制御し、吸音可能な周波数領域を拡大してある。【選択図】図1
SOUND ABSORPTION STRUCTURE BY VEHICULAR TRIM MATERIAL
車両用トリム材による吸音構造
2016-05-30
Patent
Electronic Resource
Japanese