The invention concerns an acoustic panel for an aircraft nacelle, comprising, from a central axis of the nacelle to the exterior thereof: a resistive skin 11 perforated with sound-absorbing micro-perforations 16, a first damping stage 12, a septum 13 perforated with holes 17, a second damping stage 14, and a back skin 15 configured to provide the mechanical strength of the acoustic panel. The septum 13 is a planar wall having a thickness greater than the thickness of the resistive skin (11), preferably greater than 4 mm. Such a panel is configured to attenuate several frequency ranges one of which being a low-frequency range, while optimizing the weight, the cost and the air intake functions, wherein one of these frequency ranges is a low frequency range. The thickness of the septum, the size of the hole in the septum, the OAR of the septum, and the height of the second attenuation stage are adjusted to match the low frequency attenuated on average to the vibration frequency of the aircraft engine.

    本发明涉及一种用于飞行器发动机舱的声学板,该声学板从发动机舱的中心轴线至发动机舱的外部包括:穿有吸收声音的微穿孔(16)的抵抗性蒙皮(11)、第一衰减级(12)、穿有孔(17)的隔片(13)、第二衰减级(14)以及构造成提供声学板的机械强度的背部蒙皮(15)。隔片(13)是具有大于抵抗性蒙皮(11)的厚度、优选地大于4mm的厚度的平面壁。这种板构造成衰减一些频率范围,同时优化重量、成本和进气口的功能,其中,这些频率范围中的一个范围是低频范围。调节隔片的厚度、隔片中孔的尺寸、隔片的OAR以及第二衰减级的高度以使平均被衰减的低频与飞行器发动机的振动频率匹配。


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    Title :

    Multifrequency absorption acoustic panel for an aircraft nacelle


    Additional title:

    用于飞行器发动机舱的多频吸收声学板


    Contributors:

    Publication date :

    2021-05-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT



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