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首页> 外文期刊>Journal of the American Helicopter Society >In-Flight Array Measurements of Tail Rotor Harmonic Noise
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In-Flight Array Measurements of Tail Rotor Harmonic Noise

机译：机尾转子谐波噪声的飞行中阵列测量

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摘要

Acoustic data utilizing a unique flying microphone boom array were processed and analyzed using a time domain averaging technique, based on a theoretical tail rotor one-per-rev signal, to obtain tail rotor acoustic time histories for forward and descending flight. This flying microphone array approach provides useful insight into the directivity and noise mechanisms associated with the harmonic noise generated by the Bell 206B tail rotor. Comparisons between linear harmonic noise theory and the time-averaged experimental data show good agreement and indicate that the average harmonic noise of the 206B is dominated by thickness noise near the tip path plane of the tail rotor and by loading noise at the out-of-plane microphone positions. The data also provide trends associated with the overall sound pressure level (OASPL) for both forward velocity and descent angle. A significant variance about the tail rotor harmonic noise is also shown, possibly indicating that other sources of aperiodic tail rotor harmonic noise may be important.
机译：基于理论上的尾桨每转一个信号，使用时域平均技术处理和分析了利用独特的飞行传声器吊杆阵列的声学数据，从而获得了用于前向和下降飞行的尾桨声时历史。这种飞行麦克风阵列方法为了解与Bell 206B尾桨产生的谐波噪声相关的方向性和噪声机制提供了有用的见识。线性谐波噪声理论与时均实验数据之间的比较显示出很好的一致性，并表明206B的平均谐波噪声主要由尾旋翼尖端路径平面附近的厚度噪声和非惯性载荷引起的负载噪声控制。平面麦克风位置。数据还提供了与前进声速和下降角有关的总体声压级（OASPL）的趋势。还显示了有关尾桨谐波噪声的显着变化，可能表明其他非周期性的尾桨谐波噪声可能很重要。

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