A front landing gear bay door

CN121929309BActive Publication Date: 2026-06-12COMMERCIAL AIRCRAFT CORP OF CHINA LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
COMMERCIAL AIRCRAFT CORP OF CHINA LTD
Filing Date
2026-03-31
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing technologies exhibit significant abnormal vibration and flow-sound coupling phenomena in the nose landing gear bay of aircraft, leading to noise radiation and structural damage. Meanwhile, noise suppression measures often increase drag or weight, affecting aircraft performance.

Method used

Design a nose landing gear bay door with an internal sound-absorbing structure, including a back cavity layer composed of perforated plate layers, metal wire mesh layers, and labyrinth-type superstructure sub-units, to reduce noise in different landing gear states and weaken the impact of cavity flow on the cabin.

Benefits of technology

Without altering the aircraft configuration, this effectively reduces noise during landing gear retraction and extension, minimizes structural damage, improves aircraft comfort and safety, and avoids performance loss.

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Abstract

The present application relates to a kind of front landing gear bay door, it includes front door and rear door, noise reduction structure is installed in the interior of rear door, wherein, noise reduction structure can be realized in the state of landing gear retraction, front door opening and rear door closing, change acoustic impedance and carry out noise reduction to cavity noise, and in the state of landing gear is put down, front door is closed and rear door is opened, part of sound wave is absorbed and carries out noise reduction to landing gear noise, and wherein, noise reduction structure includes multiple sound absorption units, each unit contains three layers, including perforated plate layer, wire mesh layer and back cavity layer, wherein back cavity layer is combined by labyrinth type superstructure subunit and square cavity subunit.It is also related to the aircraft including such front landing gear bay door.
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Citation Information

Patent Citations

  • Aircraft and cabin noise reduction method and device of aircraft

    CN105416604A

  • Aircraft landing gear noise reduction device and method with miniature metal wire wound on surface

    CN121106683A