Research Of Radiated Noise Field Characteristics Of Underwater Glider In Ocean Channel

Underwater glider equipment has received increasing attention in domestic and foreign due to its excellent combat performance.At present,the acoustic research on underwater glider equipment is mainly concentrated in the free field environment.An acoustic method that can efficiently and accurately calculate the radiated sound field of underwater glider equipment in a channel environment is very necessary to research its acoustic properties.This paper presents an equivalent source method base on normal vibration velocity and sound pressure.This method is an equivalent source method that combines normal vibration velocity and sound pressure to match the virtual source intensity,and this method is effective for the inversion of virtual source intensity.This method uses the image source method to express the Green function when solving the virtual source intensity.After that,the far field is calculated through the normal mode function.The accuracy of the method is verified by the numerical simulation of the dipole sound field and the elastic spherical shell sound field.In the shallow water,numerical simulation of dipoles shows that in the low frequency case,when the sound field distribution is extremely uneven on the data extraction surface,the traditional method is difficult to reconstruct the sound field,this method still maintains a high accuracy.Numerical simulation of elastic spherical shell shows that this method can still obtain a smaller error value than the traditional method for elastic structures source which under low frequency excitation.In the case that the calculation accuracy is similar to the traditional method,this method only requires less than half of the input data of the traditional method.After that,this paper calculates and analyzes the radiation noise field of the underwater glider equipment in the ocean channel.This paper analyzed the spatial distribution characteristics of the radiated sound field of the glider equipment under different excitation frequencies and different channel environments,and researched the directivity of the radiated sound field of the glider equipment in the shallow and deep ocean channel environments.