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Study shows how porous land such as foliage/grass significantly lowers noise made by drones and air taxis which could reduce disturbances for urban communities and optimise propellor performance
Grass surfaces drastically reduce drone noise making the way for soundless city skies Press release issued: 22 January 2025 Porous land such as foliage significantly lowers noise made by drones and air taxis which could reduce disturbances for urban communities as Urban Air Mobility (UAM) grows. The findings, published today in Nature Scientific Reports, show, for the first time, how porous ground treatments can mitigate noise and optimise propellor performance.
Dr Kamliya Jawahar based in Bristol’s Faculty of Science and Engineering explained: “It was known that ground effects influence propeller performance and noise, particularly during take-off and landing. Dr Kamliya Jawahar said: “Vegetation is known to function as a natural porous medium, where its structural complexity and material properties such as foliage density and moisture content contribute to its noise absorption capabilities. “Our research demonstrates that innovative porous landing surfaces can drastically reduce noise from drones and air taxis, paving the way for quieter and more sustainable urban skies,” added Dr Kamliya Jawahar.
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