基于HHC的旋翼噪声主动控制风洞试验研究

Wind Tunnel Test of Active Control of Rotor Noise based on HHC

为研究建立的基于高阶谐波控制(HHC)的旋翼噪声主动控制系统,并探索其噪声控制效果,在中国直升机设计研究所8 m×6 m开口式风洞开展了基于HHC的旋翼噪声主动控制风洞试验。试验构建了装有高频液压作动器的旋翼主动控制系统以及旋翼噪声测量系统,分别针对旋翼悬停、平飞和斜下降典型状态,通过施加不同幅值、相位的高阶谐波控制,探索了施加主动控制的降噪效果。试验数据分析表明,激励振幅和激励相位对旋翼噪声水平均有明显的影响,在悬停、平飞以及斜下降三种工况下,对比无激励状态声压级分别能实现最大降噪4.4 dB、3.8 dB、1.3 dB。本次试验的成功实施,有利于推动噪声主动控制技术的发展和工程转化应用。

In order to establish an active rotor noise control system based on high harmonic control and verify its noise control effect,the first phase of active rotor noise control wind tunnel test based on high harmonic control was carried out in 8m×6m open wind tunnel at China Helicopter Research and Development Institute.The rotor active control system and the rotor noise measurement system of equipped with the high frequency hydraulic actuator were built in the experiment.The noise reduction effect of the active control system was verified by applying the high harmonic control with different amplitude and phase for the typical situations of the rotor hovering,level flight and oblique descent respectively.The analysis of test data showed that the excitation amplitude and excitation phase had a significant influence on the noise level of the rotor,and the maximum drop of the sound pressure level reached 4.4dB,3.8 dB and 1.3dB respectively under the three operating conditions.The successful implementation of this experiment was conducive to promoting the development of domestic active control technology and the application of engineering transformation.