Landing Gear Noise Reduction Using Porous Plates

What is it about?

In 2017, the Japan Aerospace Exploration Agency successfully reduced noise from the main landing gear of their “Hisho” research aircraft by 4.2 to 4.4 dB during a flight test. We used a special axle cover made from a porous metal plate, which proved to be the most effective noise-reduction method. The design of this cover was based on wind-tunnel tests, featuring 2 mm circular holes arranged in a staggered pattern. We also compared different materials using computer simulations to better understand how the cover helps reduce noise.

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