水下航行体水动力辐射噪声预报方法研究

Prediction of hydrodynamic radiation noise of underwater vehicle

为评估水下航行体水动力辐射噪声性能,将航行体湿表面划分为若干子单元,运用功率谱的概念和模态平均法,计算子单元受湍流脉动压力激励振动声辐射,根据声能迭加原理建立航行体水动力辐射噪声的计算方法。数值计算表明,水下航行体水动力辐射噪声的预报与国外方法提供结果基本一致。6 m/s以上航速声压谱级最大偏差小于3 dB,所建立的方法可用于水下航行体水动力辐射噪声的预报和评估。

With using of sub-element method the vehicle is divided into a lot of panel sub-elements for predicting hydrodynamic radiating Noise of underwater vehicle. The vibration and sound radiation of each panel element induced by the wall fluctuation due to turbulent boundary layer are calculated based on the concept of power spectrum density and the mode average method. And the hydrodynamic sound radiation of the vehicle is predicted based on energy superposition principle. The results of numerical calculation show that the calculated results of hydrodynamic sound radiation from underwater vehicle agree with those from foreign literatures and the difference of sound pressure level is less than 3dB as the speed above 6m/s. This method can be applied in predicting hydrodynamic noise of underwater vehicle.