Experimental study on Noise Generation of a Two-Wheel Main Landing Gear
Experimental study on Noise Generation of a Two-Wheel Main Landing Gear
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DOI：
10.2514/6.2010-3973
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Y. Yokokawa;T. Imamura;H. Ura;H. Uchida;Kazuomi Yamamoto;Hiroshi Kobayashi
中科院分区：
文献类型：
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作者：
Y. Yokokawa;T. Imamura;H. Ura;H. Uchida;Kazuomi Yamamoto;Hiroshi Kobayashi
本文介绍了某型40%两轮式飞机主起落架低速风洞噪声测量结果。为了准确评估噪声源位置和进近阶段的远场特性，使用了具有复杂几何形状的比例模型，该模型配备了小部件，如连杆机构、液压管和电线以及轮胎、气缸、活塞、门和侧撑。模型几何形状是基于起落架噪声评估几何形状（LEG），该几何形状是由齿轮制造商假设100-PAX级支线喷气式客机而设计的。在日本宇宙航空研究开发机构（JAXA）的2 m × 2 m低速风洞和日本铁道技术研究所的大型消声装置中进行的实验结果表明，轮胎、侧撑、车门的某些部位以及气缸与侧撑的连接处是主要的噪声源。在这些主要噪声源中，轮胎和侧撑对总噪声贡献较大。结果发现，1 kHz附近的噪声特性是重要的，不仅在振幅，而且在实际的飞机规模的方向性。即使在缩尺模型中，小部件和实际起落架的几何形状的表示似乎也能有效地降低几分贝的噪声水平。
This paper deals with results of noise measurements for a 40% of two-wheel type aircraft main landing gear in lowspeed wind tunnel experiments. In order to accurately assess a noise source location and far-field characteristics during the approach phase, scale model with complex geometry which was equipped with small components such as link mechanism, hydraulic tubes and electrical wiring as well as a tire, a cylinder, a piston, doors, and a sidebrace was used. Model geometry was based on LEG (Landing gear noise Evaluation Geometry) which was designed by a gear manufacturer assuming 100-PAX class regional jet airliner. Experimental results obtained in two kinds of wind tunnels, which were 2m by 2m lowspeed wind tunnel in JAXA and large scale anechoic facility of Railway Technical Research Institute of Japan, showed dominant noise sources around a tire, a sidebrace, some parts of the door and also the junction between the cylinder and the sidebrace. Among these prominent noise sources, the tire and the sidebrace were large contributor to the total of noise level. It was found that noise characteristics around 1kHz was important not only in the amplitude but also in directivity for an actual aircraft scale. Representation of small components and geometry of an actual landing gear even in a scale model seemed to be effective of several decibels in noise level.