To provide a sound absorbing structure capable of obtaining a sound absorbing effect in a target frequency band with a finely perforated plate while suppressing the through hole of the finely perforated plate from disturbing the fluid flow in the circulation space.SOLUTION: Each through hole 401 of a finely perforated plate 40 is formed so that a hole cross-sectional area Ah becomes larger toward the other surface 403 side of a hole axial direction DRa. Therefore, an opening area where the through hole 401 is open toward a circulation space 24c can be smaller compared with the case where the hole cross-sectional area Ah of the through hole 401 is constant, while a volume of the through hole 401 of the finely perforated plate 40 is set to a desired size. Therefore, it is possible to obtain a sound absorption effect in a target frequency band by the finely perforated plate 40 while suppressing the through-hole 401 from disturbing fluid flow in the circulation space 24c.SELECTED DRAWING: Figure 2
【課題】微細穿孔板の貫通孔が流通空間の流体流れを乱すことを抑制しつつ、微細穿孔板によって狙いの周波数帯の吸音効果を得ることが可能な吸音構造体を提供する。【解決手段】微細穿孔板40の貫通孔401は、孔断面積Ahが孔軸方向DRaの他面403側ほど大きくなるように形成されている。そのため、微細穿孔板40の貫通孔401の体積を所望の大きさとしつつ、貫通孔401が流通空間24cに対して開口する開口面積を、貫通孔401の孔断面積Ahが一定である場合に比して小さくすることができる。従って、その貫通孔401が流通空間24cの流体流れを乱すことを抑制しつつ、微細穿孔板40によって狙いの周波数帯の吸音効果を得ることが可能である。【選択図】図2
SOUND ABSORBING STRUCTURE
吸音構造体
2019-11-28
Patent
Electronic Resource
Japanese
IPC: | G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES / B60H ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES , Anordnung oder Einbau der Heizung, Kühlung, Lüftung oder anderer Luftbehandlungsvorrichtungen für die Fahrzeugräume für Reisende oder Fracht |
European Patent Office | 2018
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