水下航行器辐射噪声仿真及试验研究

Simulation and Experimental Study on Radiation Noise of Underwater Vehicles

摘要:

水下航行器的声防护性能一直受到广泛的关注，由动力装置振动产生的辐射噪声严重影响水下航行器整体辐射噪声水平。为准确计算辐射噪声大小，通过振动测试获取水下航行器基座位置的振动加速度级，以基座位置的真实振动加速度作为输入，应用有限元法计算水下航行器的辐射噪声，并与水下航行器辐射噪声实测值进行对比。结果表明，水下航行器辐射噪声的仿真计算值与实测值较接近，仿真计算值与实测值的差距范围为 0.2~3.9 dB，辐射噪声大小随频率变化规律与实际情况一致。此种方法准确、高效，对于计算水下航行器辐射噪声大小和指导水下航行器减振降噪设计有十分重要的意义。

关键词:水下航行器;辐射噪声;振动加速度;有限元

Abstract:

The acoustic protection performance of underwater vehicles has been widely concerned. Radiation noise generated by vibration of the power unit seriously affects the overall radiation noise level of underwater vehicles. The vibration acceleration level of the bases of the underwater vehicle is obtained by vibration test，and is taken as input. Then，the radiation noise of the underwater vehicle is calculated by finite element method. The calculated value is compared with the measured value. The results show that the calculated value is close to the measured value，with a difference of 0.2-3.9 dB，and the variation of radiation noise with frequency is consistent with the actual situation. This method is accurate and efficient，which is of great significance to forecast the radiation noise of underwater vehicles and to guide the design of vibration and noise reduction for underwater vehicles.

Key words:underwater vehicle;radiation noise;vibration acceleration;finite element