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<p>This paper presents the experimental validation of a higher harmonic control (HHC) system for a 1.5-m diameter model rotor in an anechoic chamber environment. The model rotor was equipped with a closed-loop stepper motor based HHC actuation system and a dedicated controller. The experiments were conducted to simulate the hovering condition of a helicopter, where different frequencies, amplitudes, and phases of HHC control signals were applied to investigate the noise reduction performance at various observation points around the rotor disk. The results demonstrate that by applying appropriate 3&#xa0;Ω HHC signals, the in-plane noise can be reduced by up to 7.2&#xa0;dB. Furthermore, when suitable 2&#xa0;Ω HHC signals were applied, the out-of-plane noise can be reduced by as much as 10.8&#xa0;dB. These experimental findings validate the effectiveness of the HHC system in actively controlling the rotor noise under simulated helicopter hovering conditions.</p>

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Experimental Test of Higher Harmonic Control for Rotor Hover Noise via Sound Pressure Cancellation

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Jinchao Ma,
  • Yang Lu,
  • Kuihui Song

摘要

This paper presents the experimental validation of a higher harmonic control (HHC) system for a 1.5-m diameter model rotor in an anechoic chamber environment. The model rotor was equipped with a closed-loop stepper motor based HHC actuation system and a dedicated controller. The experiments were conducted to simulate the hovering condition of a helicopter, where different frequencies, amplitudes, and phases of HHC control signals were applied to investigate the noise reduction performance at various observation points around the rotor disk. The results demonstrate that by applying appropriate 3 Ω HHC signals, the in-plane noise can be reduced by up to 7.2 dB. Furthermore, when suitable 2 Ω HHC signals were applied, the out-of-plane noise can be reduced by as much as 10.8 dB. These experimental findings validate the effectiveness of the HHC system in actively controlling the rotor noise under simulated helicopter hovering conditions.