Ultrasonic Multiple Scattering Parameters Of Two-Dimensional Cylinders Immersed In Water

The study of multiple scattering sound is of great significance for exploring the internal structure of strong scattering media,enriching the experimental phenomena of related problems,verifying and perfecting related theories,and exploring the physical nature of multiple scattering.In this thesis,a group of parallel cylinders arranged in disorder in the water is the research object to study the properties of the transmitted wave of a plane ultrasonic pulse after multiple scattering,and we obtain the corresponding multiple scattering parameters by analyzing the characteristics of the ballistic wave and multi-scattering wave.In the first part of the thesis,we introduce the purpose and significance of studying multiple scattering sound research at home and abroad in recent years,as well as the theories,methods and models of studying multiple scattering sound.In the second part of the thesis,we study the characteristics of ultrasound propagation in solids and liquids,and discuss the scattering of a single cylinder in water in detail,as well as discuss the issue of its scattering cross section.In the third part of the thesis,we introduce the theories and models for studying multiple scattering sound.In the fourth part of the thesis,we introduce the methods of the study of multiple scattering problems in this paper,and discuss the results of related problems in detail.