Generation And Application Of Artificial Diffusion Sound Field

Underwater acoustic metering and measurement is the technical basis for the development of underwater acoustics.Common test environments include free-field and reverberant fields.The measurement principle in the reverberation field is simple and feasible,and the implementation cost is low.However,because the reverberation pool is difficult to achieve the diffusion conditions,complex measurement methods are needed to ensure accurate measurement.In this paper,by placing multiple sound sources in the reverberation pool,the spatial distribution of acoustic energy in the existing pool is improved,and the artificial dispersion sound field is constructed to simplify the measurement steps of the underwater acoustic reverberation method and improve the measurement efficiency.Research on improving the dispersion of reverberant pools by placing multiple sound sources has not been reported yet.This paper analyzes the sound field of reverberant pools under multiple sound sources from the perspectives of theory,numerical simulation and experiment.Firstly,the influence of multiple sound sources on improving the dispersion of sound field is analyzed from the perspective of normal wave and energy statistics.Then using the finite element software for numerical calculation,it is verified that the degree of excitation of the simple wave at different positions of a single sound source is different.The sound field under multiple sound sources is simulated in different pools.The sound source is randomly transmitted from the angle of sound wave superposition,and the dispersion can be realized by using a certain frequency bandwidth analysis.Then,the acoustic characteristics of the glass water tank are measured,and the experiment of the influence of the sound source number,the sound source signal amplitude,the sound source emission signal and the sound source connection mode,and the different positions of the sound source on the sound field dispersion degree is designed and designed.The experimental results show that the sound generation method with increased number of sound sources and small amplitude white noise can increase the sound field dispersion.Finally,the hydrophone comparison method is calibrated in the generated diffuse sound field,and the measurement error is controlled within 0.6 dB,and the uncertainty is about 0.5 dB.The results show that spatial averaging can be omitted without measuring in an artificially dispersed sound field composed of multiple sound sources.In this paper,by studying the influence of multiple sound sources on the uniformity of sound energy in the reverberation pool,a relatively diffuse sound field is generated,which simplifies the measurement steps of the hydroacoustic reverberation method,and has important significance for the promotion and application of the reverberation method.