The Study on Noise Characteristics of Underwater Electric Propulsion

In order to study the noise characteristics of underwater electric propulsion, the vibration and noise of the electric propulsion were measured in a cavitation tunnel. The performance of the noise is studied and the relationship between vibration and noise was analyzed. The results show that there are significant peaks in the noise spectrum whose frequency is consistent with the switching frequency and its multiplication of motor controller, and the peaks have a great contribution to the overall sound pressure level(OASPL). The noise level and narrow-band peak width of electric propulsion increase with the rotate speed increasing. Only part of the peaks in the vibration acceleration spectrum of electric thruster can radiate noise.