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Experimental study of realistic low-noise technologies applied to a full-scale nose landing gear

机译：逼真低噪声技术应用于全尺寸鼻落齿轮的实验研究

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The landing gear system is the dominant airframe noise source for most modern commercial aircraft during approach. This manuscript reports the results from the ALLEGRA (Advanced Low Noise Landing (Main and Nose) Gear for Regional Aircraft) project. This project assessed the performance of several highly realistic low-noise technologies (LNTs) applied to a detailed full-scale nose landing gear (NLG) model in aeroacoustic wind-tunnel experiments. Four individual low-noise concepts tested, namely a ramp door spoiler, a solid wheel axle fairing, wheel hub caps, and multiple perforated fairings. Combinations and small variations of some of these LNTs were also evaluated. The use of multiple planar microphone arrays allowed for the application of 2D and 3D acoustic imaging algorithms to assess the location and strength of the noise sources within the NLG system in different emission directions for each configuration. The wheel axle, the inner wheel hubs, the steering pinions and the torque link were identified as the noisiest NLG elements. The solid wheel axle fairing was the most effective individual LNT, and it improved its performance when applied in combination with the ramp door spoiler and wheel hub caps, reaching overall noise reductions of more than 4 dBA. (C) 2021 The Author(s). Published by Elsevier Masson SAS.
机译：着陆齿轮系统是在接近时最现代化商用飞机的主导机身噪声源。此手稿报告了Allegra（用于区域飞机的先进低噪声着陆（主和鼻子）齿轮的结果）项目。该项目评估了几种高度现实的低噪声技术（LNT）的性能，其应用于流动隧道实验的详细全尺寸鼻落齿轮（NLG）模型。测试了四个单独的低噪声概念，即斜坡门扰流板，固体轮轴整流罩，轮毂盖和多个穿孔的整流罩。还评估了一些这些LNT的组合和小变化。使用多个平面麦克风阵列允许应用2D和3D声学成像算法，以评估每个配置的不同发射方向的NLG系统内的噪声源的位置和强度。轮轴，内轮毂，转向小齿轮和扭矩链路被识别为最嘈杂的NLG元件。固体轮轴整流器是最有效的单独LNT，它在与斜坡门扰流板和轮毂盖组合应用时改善了其性能，达到了超过4 dBA的整体噪声减少。 （c）2021提交人。由Elsevier Masson SA出版。

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