Underwater Radiated Noise Evaluation and Experimental Analysis of the Support Mother Ship for a Manned Submersible

This study investigates the underwater radiated noise (URN) of a manned submersible support mother ship. To this end, a detailed finite element model of the hull and outflow field is established, and the vibration wet mode of the scientific research ship is calculated. A combination of finite element and boundary element methods is used to analyze the spectral features of ship low-frequency URN. The URN source is comprehensively analyzed, the vibration energy is considered the basic parameter to describe the vibration, and the medium- and high-frequency URN of the ship are calculated using the statistical energy analysis. To obtain the full frequency-band URN of the ship, the risk position of exceeding the standard is determined, and the contribution of each main noise source in the ship to the URN is analyzed. The URN level of the ship is comprehensively measured in the free navigation state. The accuracy of the URN control evaluation model, and the method of the ship are verified. The data support for the ship to apply for the classification society certificate provides a scheme reference for the URN control of other scientific research ship in the future.