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首页> 外文期刊>Journal of the American Helicopter Society >Full-Scale Demonstration of Higher Harmonic Control for Noise and Vibration Reduction on the XV-15 Rotor
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Full-Scale Demonstration of Higher Harmonic Control for Noise and Vibration Reduction on the XV-15 Rotor

机译:在XV-15转子上进行高次谐波控制以降低噪声和减振的全面演示

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摘要

A higher harmonic control (HHC) investigation was conducted on a full-scale, isolated XV-15 rotor in helicopter mode in the NASA Ames 80- by 120-Foot Wind Tunnel to independently control noise and vibration. The higher harmonic blade pitch was generated using swashplate oscillations. The radiated blade-vortex interaction (BVI) noise footprint was measured on a plane beneath the rotor with an acoustic traverse. Test results showed that HHC is highly effective in reducing BVI noise, achieving a 12 dB reduction in peak noise level within the noise footprint. Noise reduction with HHC remains effective even with perturbations in rotor trim and flight conditions.
机译:在NASA Ames 80-120英尺风洞中,在直升机模式下的全尺寸隔离XV-15转子上进行了高次谐波控制(HHC)研究,以独立控制噪声和振动。使用斜盘振荡产生较高的谐波叶片螺距。辐射叶片-涡旋相互作用(BVI)噪声足迹是在转子下方的平面上通过声横波测量的。测试结果表明,HHC在降低BVI噪声方面非常有效,在噪声足迹范围内将峰值噪声水平降低了12 dB。即使在旋翼微调和飞行条件下产生扰动,使用HHC进行降噪仍然有效。

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