Localization And Identification Method Of Noise Source In Closed Limited Space

Accurately positioning the main noise sources in the cabin and controlling them is one of the effective methods for reducing vibration and noise in submarine cabin.In the interior of the submarine cabin,the reflection of the sound waves on the wall makes the sound field in the cabin a reverberation field.It is difficult to locate the sound source in the reverberation field.Therefore,it is important to choose a suitable method to locate the noise source in the cabin.In order to solve the problem that the sound field environment in the closed space is complex and not conducive to positioning.Firstly,the simplified model of the closed space is analyzed,the sound field is divided into low-frequency and high-frequency sections according to the frequency band division criteria of the interior acoustics.In the middle and low band of frequency,the mode superposition method is used to analyze the sound field in the cylinder cavity strictly.In the high frequency band,combined with the geometric acoustics,different methods are selected for positioning according to the different characteristics of the sound field in different frequency bands.Aiming at the problem that the sound field has a high degree of non-uniformity in the low frequency band,and the traditional beamforming method has a poor positioning and recognition effect,this paper analyzes and explores the near-field acoustic holography of the equivalent source method.The feasibility of field acoustic holography to locate the sound source in the cylindrical cavity.Aiming at the problem of positioning performance degradation that may be caused by mismatch of transfer matrices,the effects of mismatching positionning performance of the transfer function caused by mounting errors in the array and the presence of scatterers in the column cavity are determined through simulation.Aiming at the problem of reflected sound interference in high frequency bands,which affects the positioning effect,this paper discusses the array receiving data model considering wall reflections,and introduces the positioning principles of CBF,DAMAS,GIB,and the relationship among the three.The positioning performance of the three methods is compared and analyzed by simulation experiments.Finally,experiments on single and dual sound sources in the cabin model were carried out.The applicability and effectiveness of the method in the column cavity and the ability of localization and identification of dual sound sources are verified.The experimental results are consistent with the theoretical analysis,which provides a certain reference significance for the location identification of the enclosed space noise source.