A Comprehensive Analysis Of Underwater Radiated Noise Based On Partial Coherence

Submarine vibration noise directly determines its combat strength,so the noise control for improving the performance of the submarine is extremely important.From the acoustic point of view,the submarine has a large number of noise sources,coupled with each other and the transmission path of the complex characteristics of the serious.Therefore,it is very important to separate and quantify the main noise of the complex noise source,and to control the vibration noise source in a targeted way.Based on the multi-input single-output model and the partial-coherence as the theoretical basis,the vibration noise source is quantified by the method of the hierarchical diagnosis.Firstly,the principle of partial coherence analysis is studied.For the multi-input single-output model,the conditional power spectrum function and partial coherence function formula are given.The validity of the partial coherence function in the multi-input problem is verified by simulation.According to the coherent/partial coherent output power spectrum,the hierarchical structure is established,and then the hierarchical dominance relation is formed.On the basis of this,the appropriate scale is used to analyze the noise level of each layer.The judgment matrix is established and the weights are obtained through the judgment matrix,which provides the basis for analyzing the contribution of the noise source to the evaluation points.In this paper,we use the method of partial coherence and hierarchical diagnosis to give the judgment matrix under different criteria,and according to the judgment matrix,we can get the weight of different elements in the same hierarchical hierarchy.The simulation results show the validity of the noise source level diagnosis based on partial coherence for the multi-input single-output problem.The simulation calculation proves that the method based on partial coherence is more accurate in dealing with the separation and quantization of complex noise sources.Finally,the method of analyzing the transmission path of the condition is studied,and the traditional transmission path analysis method and the Operational Transfer Path Analysis are compared.The transmission path of the noise of multi-input single-output model is analyzed by simulation.