Research On The Inversion Method For Equivalent Material Parameters Of Acoustic Coating

Underwater vehicles concealment is of great importance.Acoustic coating layer is an important means to reduce the vibration and noise of underwater vehicles.The problem of forecasting the radiation noise of underwater vehicles is related to the effective determination of the underwater safety scope of the aircraft.Acoustic coating material parameters are necessary input parameters in the process of radiation noise prediction.The accuracy of the acoustic coating material plays an important role in the prediction results.The determination method is also an urgent problem to be solved.At present,there is still no effective input parameters in the research of underwater vehicle noise forecasting.That makes the forecasting accuracy is poor and can not meet the current development needs of product development and related technology research.In this paper,an equivalent material parameter inversion method based on node velocity matching is proposed to solve this problem.To simplify the experiment of material parameters of acoustic coating,this paper numerically studies the feasibility of using the inversion results of plate model parameters in air to compute the radiometric sound of underwater model with acoustic coating.Meanwhile,this paper analyzes the applicability of using the inversion results retrieved from the flat plate model to compute the radiometric sound of cylindrical shell model.The effect of the material of the cylindrical shell,the ratio of length to radius and loop frequency are studied numerically.The paper studies the feasibility of using the inversion results of cylinder model to compute the radiometric sound of other cylinder models.In addition,the vibration and acoustic field experiment of plate and cylindrical shell models are carried out in an anechoic sink.The experimental results show that it is feasible to use the equivalent parameters of acoustic coating in air based on vibration matching to realize the underwater acoustic power computation.Meanwhile,The results of plate inversion in air can be used to compute the radiation field of underwater cylindrical shell model.