The Algorithm And Software Realization Of The Location Of Noise Source In Cabin

The interior of the submarine cabin has many mechanical equipment and complex structure.In response to the needs of noise control and dynamic stealth in the submarine cabin,research on noise source location has become a key technology.The spherical array has good symmetry,and its application to the location of noise sources in three-dimensional spaces such as cabins not only saves space,but also gives full play to its directivity advantages.Considering that the cabin structure has the characteristics of limited enclosed space,and the noise sources in the cabin have the characteristics of frequency bandwidth and large spatial arrangement range,the near-field acoustic holography combined beamforming is used to locate and identify the noise source.First,for low-frequency noise sources,the spherical harmonic domain near-field acoustic holography method is used to simulate and analyze the influence of signal frequency,truncation order,and signal-to-noise ratio on the performance of the algorithm;secondly,for mid-and high-frequency noise sources,carry out Research on spherical harmonic function beamforming method,the algorithm is more efficient,in order to better suppress sidelobes,the generalized inverse beamforming method research is carried out,the generalized inverse beamforming algorithm based on high-order matrix function is studied,simulation analysis The influence of the order on the positioning performance.Aiming at the problem of obvious attenuation of sound source intensity when the order is higher,the study of the dual-iterative generalized inverse beamforming method is carried out.The simulation and analysis of the regularization iteration number and the generalized inverse iteration number on the algorithm performance Impact;Finally,for broadband signals,a beamforming method based on frequency focusing transformation is carried out.The frequency focusing matrix is constructed using the rotating signal subspace algorithm,and the narrowband algorithm such as CBF is used to spatially spectrum the data covariance matrix of a single frequency point after focusing.estimate.Jointly developed by Qt and numerical calculation software,a "cabin indoor and outdoor radiated noise rapid prediction software" was compiled that integrates data preprocessing,noise source location and recognition,cabin sound field prediction,cabin shell sound transmission loss calculation and outboard radiation noise trend forecasting..Based on the theoretical research of noise source location and recognition algorithm,free-field and cabin model tests were carried out to verify the sound source location performance of the cabin noise source location and recognition method.Experimental research shows that near-field acoustic holography in the spherical harmonic domain has good performance in locating low-frequency noise sources in the cabin,and beamforming has good performance in locating mid-and high-frequency noise sources in the cabin.The experimental results are consistent with the theoretical analysis,which is a good location for cabin noise sources.The identified engineering applications provide guidance.