Research And Application Of Mechanical Noise Source Localization Of Microphone Array Based On Beamforming

In this paper,the performance of sound source localization of microphone array is studied.The structural characteristics of distributed array are introduced into regular array,and the performance of sound source localization of array is improved by reasonably expanding the array aperture.For each array structure,the simulation analysis of sound source localization performance and the actual noise source test experiment are carried out.The sound source localization performance of regular microphone array and several kinds of distributed microphone arrays are compared and analyzed.It is found that the distributed microphone arrays can improve the sound source localization performance of regular microphone arrays to some extent,and the distributed microphone array is applied to locate the noise source of dehumidifier and low-speed moving vehicle.In addition,the project has been funded by the National Natural Science Foundation(61671262,61871447).The main contents of this paper are as follows:(1)The research status and development trend of beamforming,microphone array and sound source localization are analyzed,the principle of sound field division is defined,the principle of delay summation beamforming is deduced,the model of microphone array receiving sound source signal is analyzed,and the influence parameters of the sound source localization performance of microphone array are deduced and analyzed in theory.(2)A plane arbitrary array model is established,and the localization characteristics of the basic array are analyzed from the point of view of equation analysis.The isomorphic distributed array structure is introduced into the conventional regular microphone array,and the distributed microphone array model is established.The model of the received sound source signal is derived and analyzed theoretically.(3)Simulation study on the localization performance of distributed microphone array,and the simulation calculation of the localization performance of conventional regular microphone array and distributed microphone array is carried out respectively.Then the simulation results are compared and analyzed,and the localization performance of distributed microphone array is discussed.(4)The experimental research on locating single frequency sound source in the semianechoic chamber is carried out to verify the simulation results,and the distributed microphone array with good locating performance is selected in the acoustic imaging results of single frequency sound source.According to this,the testing research on locating noise source acoustic imaging of the dehumidifier is carried out in the semi-anechoic chamber,and the testing research on locating noise source acoustic imaging of the low speed vehicle is carried out in the outdoor.