Naval vessel noise forecasting method and system based on equivalent surface source and additional point source

Abstract

The invention discloses a ship noise forecasting method and system based on an equivalent surface source and an additional point source and relates to the related technical field of ship overall acoustic design. The method comprises steps of determining a virtual boundary line, determining a virtual sound source on the virtual boundary line based on a wave superposition theory; respectively constructing a surface sound source sound pressure model and a point sound source sound pressure model; constructing a surface sound source-point sound source sound pressure model according to the surface sound source sound pressure model and the point sound source sound pressure model; obtaining the optimal number and the optimal position data of the additional point sources; and forecasting the self-noise of the broadside platform according to the obtained relationship between the sound pressure and the normal component of the vibration velocity of the ship shell. Through the combination of the equivalent surface source and the additional point source, calculation accuracy is improved, the calculation amplitude is reduced, and calculation efficiency is improved; through learning of the neural network, the capability of quickly forecasting the self-noise of the ship shell sonar platform area is improved, and an important method support is provided for developing the self-noise control of the ship side sonar platform area.

Description

technical field [0001] The present invention relates to the technical field related to the overall acoustic design of ships, and more specifically relates to a ship noise prediction method and system based on equivalent surface sources and additional point sources. Background technique [0002] The main means of underwater detection and identification of modern ships is to use sonar. At present, ships of various countries attach great importance to the design of acoustic stealth, especially the level of acoustic stealth of ships in Western countries is already very high, even reaching the level of noise in the ocean environment, and it is difficult to be detected. very important. [0003] The detection distance and positioning recognition accuracy of sonar are affected by the performance of the equipment itself and the acoustic environment in which the acoustic array is located. Factors affecting the performance of sonar include the technical status of the sonar itself and...

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Problems solved by technology

Another example is to improve the sonar detection capability by improving the design of the sonar system, but as far as the sonar system itself is concerned, only by improving the signal processing method and increasing the aperture of the acoustic array can the detection distance be increased. The space of the sonar is limited, so the method of increasing the sonar detection capability by increasing the aperture of the sonar array is greatly restricted; therefore, it is urgent for those skilled in the art to solve the problem of maximizing the performance of the sonar system by reducing the noise in the platform area question

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