Investigations on guided wave propagation characteristics of liquid-filled pipe surrounded by seabed sediments based on Biot-Stoll theory
It is of great significance to study the acoustic characteristics of seafloor sediments for marine national defense and marine economic development.Based on Biot-Stoll theory,this paper analyzes the prop-agation characteristics of model waves generated by excitation in liquid-filled tube and submarine sediments,and simulates the application of acoustic parameter measurement in seafloor sediments numerically.First,this paper solves the sound field of the model,establishes the dispersion equation of mode waves,and studies the propagation characteristics of longitudinal axisymmetric mode in a tube.Secondly,in the study of the propagation characteristics of longitudinal L(0,1)mode guided waves,this paper simulates numerically the re-ceiving waveform,builds and solves the objective functions,and demonstrates the feasibility of the model wave in retrieving sediment pore parameters.The results show that the propagation characteristics of L(0,1)mode waves in the liquid-filled pipe-seabed sediment model are sensitive to changes in sediment pore parameters and the numerical simulation proves that L(0,1)mode waves can be used to invert sediment pore parameters.
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