The Study Of High-Resolution Location Identification Method For The Linear Array Submarine Noise Source

The acoustic stealthy performance of the submarine is a important index arm for judging its safety and operational performances.Radiated noise is the main target information of various passive sonar and detecting submarines with acoustic weapons,and is the most important factor for damaging stealthy performance.And self-noise is directly affecting its own sonar station working performance.So reducing submarine underwater noise has an important significance.For pertinently carrying out to control noises, as well as providing the actual basis for noise indicators of the acoustic design for submarines,it has a significant meaning to carry out studying the technology of noise source identification separation, find the main noise sources in the system and determine the contribution of various noise sources.With the development of the damp vibration and noise reduction technology, previous methods of the noise source location identification and analysis tools have been unable to effectively receive informations of noise sources,so researching a facilitate engineering implementation method for locating and identifying near-field noise source to apply to the large-size submarine, complex systems,which is the key of the submarine noise control and damp vibration and noise reduction technology.This paper describes the advantage of the near-field acoustic focused technology in the noise source location identification.In the basic of reviewing the theory development of the near field acoustic focusing technology and its engineering application, based on the linear array near-field acoustic focus technology applying on locating and identifying submarine noise sources, the paper progresses a systemic comprehensive theory research and experimental research on high-resolution near-field noise source location identification method whose measurement surface is flat and cylindrical,and the stability near-field noise source location identification method which can inhibit the array sensitivity error and phase error.Firstly based on near-field basic matrix theory, the paper describes the basic principles of the near-field sound focused technology, and gives the calculation formula of uniform linear array focused spatial resolution, analyse the effect of measuring distance, arrays aperture and other parameters on the focused spatial resolution.For the near-field focused spacel aliasing,advance a position fuzzy sentence method to guide designing the base matrix's form.In this paper, focusing on the lack of the conventional beamforming,MVDR near-field focused beamforming and other location identification methods, significantly researching MVDR, MUSIC near-field focused beamforming methods in the basic of the combination compensation of the amplitude and the phase.This method can implement the relative intensity estimate for noise sources, and in certain conditions it can reduce the signal frequency and restrictions of the measuring distance on the algorithm performance, increase the focused spatial resolution when the basic array works at the low frequency, make it have better capacity to inhibit space aliasing at high frequencies, with lower side lobe level, stronger anti-interference ability, smaller estimation error of sound source intensity, higher positioning accuracy.For the problem that the class algorithm of extremum seeking does not apply to coherent sources near-field location and identification, give a coherent sources near-field high-resolution location identification method based on maximum likelihood estimation,and find a global optimal solution of maximum likelihood estimation with the heredity algorithm.The method has high positioning accuracy, and only with a small aperture arrays it can achieve coherent sources near-field high-resolution location, while not subject to restrictions on the geometry structure of the array.Because near-field sound focused technology is difficult to locate and identify the noise source at the end-fire direction, the paper raise a end-fire direction near-field noise source location identification method based on the virtual rotation transformation technology to analyse that the aperture of the virtual array,the measurement distance, SNR, the observation intervaland and other parameters affect the algorithm performance, and give its specific application conditions.For components of the broadband continuum spectrum of a submarine radiated noise, the paper studies a wideband noise source high-resolution near-field location identification method based on sub-band decomposition and focused transformation technology.The method effectively combines sub-band decomposition and transformation technology with the extremum seeking algorithm by using the amplitude and phase compensation, which enables broadband non-coherent sources and coherent sources to achieve the relative intensity estimation and the spatial location estimation of sound sources,also compare and analyse the the characteristics of thespacial spectrum, the location performance and focused spatial resolution by this method.In this paper, study a noise source near-field high-resolution location identification method for the submarine model's measurement surface being cylindrical, and particularly analysis the performance of this algorithm.To distinguish the larboard and starboard at the near field line array positioning, propose a cylindrical near-field high-resolution location identification method with combination basic arrays, which successfully combines the advantages of the hydrophone and the cylindrical high-resolution near-field location identification method by configuring a single vector hydrophone in the sound pressure basic array, while achieving the underwater noise source near-field high resolution location identification,use the unilateral directive property of vector hydrophone to remove the confusion of the larboard and starboard in near-field location, at the same time compare and analyse the performances of the hull fuzzy suppression ability and the relative intensity estimation errors of the sound source.This paper research the stability noise source near-field location identification method at the array manifold mismatch. It can accurately obtain the required load values of across corners, inhibit that the array manifold mismatch affects performances of MVDR near-field focused beamforming rate based on the amplitude compensation, improve the solidity property of location identification methods, compare and analyse the performance of the algorithm in detail.Proposed a arrays error correction methods based on a single auxiliary vector hydrophone, use a single vector hydrophone by correcting precisely as an auxiliary basic array,which can progress a no confusion combination estimation in the far field or near-field to the spatial location of sound source arrays and the basic error, only need one-dimensional parameter search, computational load is not existed the local convergence issue at the parameters associated estimation, analyse the effect of the SNR, spatial location of the sound source and other parameters on the calibration results.This paper carries out anechoic pool and the measurement trial for the submarine on the sea, verify the effectiveness of the algorithm, theoretical analysis results and the trial results by treated are nearly the same, which provides the trial basis for further more practical engineering application of the noise source high-resolution near-field location identification method.