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首页> 外文期刊>Journal of the American Helicopter Society >Noise Source Localization on a Dauphin Helicopter in Flight
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Noise Source Localization on a Dauphin Helicopter in Flight

机译：飞行中的多芬直升机上的噪声源定位

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摘要

A flight test campaign with a Dauphin helicopter has been conducted by ONERA, in cooperation with Istres Flight Test Center (CEV). The objective was to investigate the possibility of localizing the noise sources radiated by the helicopter from measurements performed with an array of ground fixed microphones. This study is based on a method that works in frequency domain to successfully localize the airframe noise sources on an aircraft in flight. The acoustic sources identified in this framework are localized on the main rotor disk or on the fenestron depending on the frequency band and on the flight conditions. The results demonstrate the effectiveness of the method. Particularly the method has been applied to localize the blade vortex interaction noise sources that are dominant during descending flight. The results obtained for this flight condition are compared with the locations found by another method in the time domain from data collected with on-board microphones. Both methods give consistent source distributions on the main rotor disk.
机译：ONERA与Istres飞行测试中心（CEV）合作，利用Dauphin直升机进行了飞行测试。目的是研究通过使用一系列地面固定麦克风进行的测量来确定直升飞机辐射的噪声源的可能性。这项研究基于一种在频域中工作的方法，可以成功地定位飞行中飞机上的机身噪声源。在此框架中确定的声源取决于频带和飞行条件，位于主旋翼盘或费内斯特朗上。结果证明了该方法的有效性。特别地，该方法已经被应用来定位在下降飞行期间占主导的叶片涡旋相互作用噪声源。将针对这种飞行条件获得的结果与通过车载麦克风采集的数据在时域中通过另一种方法找到的位置进行比较。两种方法都在主转子盘上提供一致的源分布。

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