Noise Phase Characteristics and the Noise Cancellation of Twin-Coaxial Rotor Based on Phase Modulation Method
Noise Phase Characteristics and the Noise Cancellation of Twin-Coaxial Rotor Based on Phase Modulation Method
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DOI：
10.1007/s42405-022-00475-2
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发表时间：
2022-06
影响因子：
1.7
通讯作者：
Zeyang Wang;Jun Huang;M. Yi
中科院分区：
文献类型：
--
作者：
Zeyang Wang;Jun Huang;M. Yi
采用基于CFD方法和Ffowcs Williams-Hawkings（FW-H）方程的噪声预测方法对双桨叶共轴式旋翼进行了噪声预测，研究了共轴式旋翼的噪声特性，包括声压级的大小和分布。根据声压级分布的方向性，建立了同轴转子的罗盘剪刀模型（CSM），用于描述噪声分布的方向性和声波的相位。根据同轴转子的噪声分布特点，提出了一种由两个同轴转子组成的组合式同轴转子--双同轴转子，并采用相位调制方法，通过声波的适当叠加，抑制上下同轴转子产生的噪声。仿真结果表明，在产生相同升力的情况下，相位调制法的噪声消除效果可达16 dB，证实了相位调制法的降噪潜力，并得到了罗盘角差和剪刀角差的最优关系。共轴状态机和双共轴转子的建立对基于相位调制方法的多共轴转子系统的噪声抑制也有一定的意义。
A noise prediction method based on CFD method and Ffowcs Williams–Hawkings (FW–H) equation is adopted to the prediction of the two-blade coaxial rotor, studying the noise characteristics of coaxial rotor, including the value and the distribution of SPL. According to the directionality of the SPL distribution, a Compass–Scissors Model (CSM) of coaxial rotor is established for the description of the orientation of noise distribution and the phase of sound wave. A combined coaxial rotor called twin-coaxial rotor consisting of two coaxial rotors is put forward according to the noise distribution characteristics of coaxial rotor, and the phase modulation method is applied so that the noise produced by the lower coaxial rotor and the upper coaxial rotor can be suppressed by the proper superposition of the sound waves. The simulation results show that producing the same lift, the noise cancellation using phase modulation method can reach 16 dB, confirming the potential of the noise reduction, and the optimal relationship of the compass angle difference and the scissors angle difference are also obtained. The establishment of CSM and the twin-coaxial rotor can also be meaningful for the noise suppression based on phase modulation method of multiple coaxial rotor systems.