![]() ![]() ![]() used optical fibers to construct sensor array to improve the accuracy. ![]() used the passive time-reversal mirror combined with acoustic ray theory to identify a 3–7 kHz sound source within a 165 × 8 × 4 m towing tank. used two parallel moving hydrophone arrays to locate a 20 kHz sound source in 50 m × 35 m × 3.2 m water tank. This makes noise localization very difficult to perform in regular experimental tanks. And the average error is sufficient to determine the noise source position.Īdditionally, when the sound source localization within a confined space is considered, the strong reflection will make the wave transmission path more complex and difficult to perform the inverse calculation. For the model test in cavitation tunnel in National Taiwan Ocean University, the length of ship model is around 7 m. The average error of the test result is 0.13 m. A total of 100 data sets were used for training, 10 sets for verification, and 5 for testing. Finally, we apply our method to the cavitation tunnel model. After our optimization, the error decreases from 0.315 m to 0.008 m in cuboid model test. Then, we reset the diagonal numbers of the cross spectral matrix in Yangzhou’s method to zero and replace mean absolute error to be the loss function for improving the stability of training, and get the most suitable neural network construction for our research. ![]() And Yangzhou’s method has higher accuracy than Shunsuke’s method. In the test results, we find that the errors of the both can be reduced by using the min-max normalization to highlight the data characteristics of the low amplitude in some frequency. Firstly, we started our proposed method by improving the Yangzhou’s method and Shunsuke’s method. The main objective of this research is using the supervised neural network to construct the system of noise localization to identify noise source in the large acoustic tunnel. Therefore, it is necessary to identify the source of noise during design stage to improve the survivability of the submarines. Navigating with low noise is the key capability in the submarine design considerations, and noise reduction is also one of the most critical issues in the related fields. ![]()
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