Research Of The Methods For The Identification Of Niose Sources Based On The Acoustic Holography Techniques

In order to control and reduce the radiated noise of underwater structures more effectively, the work of the first importance is to identify the main noise sources. For the conventional methods for noise sources identification can hardly be used in analyzing the moving noise sources precisely, it is necessary to make research into the methods for the identification of moving noise sources.The moving noise sources identification methods studied in this paper are based on the acoustic holography technology. It contains research on some topics such as moving noise source's sampling and how to remove Doppler effect from the signals. The non-stationary signal received by linear vertical array is changed into stationary signal considering the Doppler effect, then used to complete the holographic construction .This paper also presents the results of the holographic construction gained by the two methods which are respectively based on the near-field acoustic holography and the far-field acoustic holography, then analyzes the influence on the holographic construction results when the measuring parameters is varied.The method for the identification of moving noise sources based on the acoustic holography technology can give comparatively precise analysis results.