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首页> 外文期刊>Journal of the American Helicopter Society >A Method to Evaluate the Contributions of Individual Interactions to Helicopter Blade-Vortex Interaction Noise
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A Method to Evaluate the Contributions of Individual Interactions to Helicopter Blade-Vortex Interaction Noise

机译：一种评估个体相互作用对直升机叶片-涡旋相互作用噪声贡献的方法

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摘要

This paper describes a methodology to quantitatively determine the contributions of individual advancing and retreating side blade-vortex interactions to the total radiated BVI noise. It can be used to identify which interactions are most acoustically significant, and potentially improve the effectiveness of BVI alleviation strategies by ensuring that secondary interactions do not gain in strength even while the dominant ones are being weakened. The methodology is based on first identifying the tip-vortex generating a particular interaction and then calculating the blade loading, acoustic pressure signal, and BVI sound pressure levels due to this single tip-vortex. This yields detailed quantitative information on the intensity and directionality of the noise due to specific interactions (associated with specific tip-vortices), as well as the contribution of the individual interactions to the total radiated BVI acoustic field. It is further demonstrated that the impulsive loads, acoustic pressure, and BVI noise can be predicted, without loss of accuracy, by considering only those portions of the tip-vortices generating close, near-parallel interactions in the 1st and 4th quadrants (instead of the entire tip-vortices extending over several rotor revolutions). The use of the current noise decomposition methodology in an application is demonstrated, and it is shown that when the descent rate is changed, or an X-force is introduced, the dominant blade-vortex interactions change.
机译：本文介绍了一种方法，可以定量确定各个前进和后退侧叶片涡旋相互作用对总辐射BVI噪声的贡献。它可以用来确定哪些相互作用在声学上最重要，并且可以通过确保次要相互作用即使在显性相互作用减弱时也不会增强强度来潜在地提高BVI缓解策略的有效性。该方法基于首先识别产生特定相互作用的叶尖涡流，然后计算由于该单个叶尖涡流而引起的叶片载荷，声压信号和BVI声压级。由于特定的相互作用（与特定的尖端涡旋相关），这产生了有关噪声的强度和方向性的详细定量信息，以及各个相互作用对总辐射BVI声场的贡献。进一步证明，仅考虑在第一象限和第四象限中产生紧密，近似平行相互作用的尖端涡旋的那些部分，就可以预测脉冲负载，声压和BVI噪声，而不会降低精度。整个叶尖涡流在转子旋转数圈后延伸）。演示了在应用程序中使用当前的噪声分解方法，结果表明，当下降率发生变化或引入X力时，主要的叶片涡旋相互作用会发生变化。

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