Abstract As a main contributor to aircraft noise at approach to landing, landing gear noise is currently a major research interest amongst aeronautical engineers and aeroacoustic researchers. Numerous technologies have been proposed for the abatement of landing gear noise. This paper presents a bibliographical review of such technologies for landing gear noise reduction, taking the Technology Readiness Level (TRL) into consideration. Noise treatment technologies applied directly to the landing gear include fairings, component optimisation, hole coverings, flow blowing and plasma actuators. The associated landing gear wheel bay has also been investigated with liners and leading edge control. Technologies currently at the conceptual design stage or proposed for noise reduction in other engineering fields but which have application potential for landing gears are also introduced. These include bio-inspired solutions, vortex generators, boundary layer suction, trailing edge serrations, and surface perturbation techniques. The combined use of different noise treatment technologies reported in open publications is also presented.

中文翻译：

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飞机起落架降噪技术——文献综述

摘要 作为飞机接近着陆时噪声的主要贡献者，起落架噪声是目前航空工程师和气动声学研究人员的主要研究兴趣。已经提出了许多用于降低起落架噪音的技术。本文对此类起落架降噪技术进行了文献综述，同时考虑了技术准备水平 (TRL)。直接应用于起落架的噪音处理技术包括整流罩、部件优化、孔洞覆盖、气流吹扫和等离子致动器。还对相关的起落架轮舱进行了衬垫和前缘控制。目前处于概念设计阶段或建议用于其他工程领域的降噪技术，但也介绍了在起落架方面具有应用潜力的技术。这些包括仿生解决方案、涡流发生器、边界层吸力、后缘锯齿和表面扰动技术。还介绍了公开出版物中报告的不同噪声处理技术的组合使用。