Simulation Of Ultrasonic Field In Layered Media With DPSM

Modeling ultrasound field is a very important content in the field of nondestructive testing,distributed point source method is one of the simulation method.This method is different from the finite element method and the finite difference method,it does not need to discretize the whole space,only need to discretize the transducer surface and interface,So it can improve the speed of calculating the sound field,is a very potential semi-analytical simulation technology.In recent years,the distributed point source method has been developed rapidly.This method can be used as a new non-destructive evaluation method,which is widely used in 2D and 3D geometric problems.This method can simulate the problems of magnetic field,ultrasonic field,electric field and electromagnetic field,which has important theoretical research value,On the practical application of engineering has important guiding significance.Based on the basic principle of distributed point source method,this paper refers to the Green's function equation,Using the boundary conditions on the surface and interface of the source,a linear equation set is established to solve the source strength vector of each point source,and then the sound field in the whole model is obtained.In this paper,I write a program to simulate the sound pressure field of fluid-fluid medium,the sound pressure field in fluid-solid medium,and the sound pressure field of fluid-solid-fluid medium.The simulation results show that the ultrasonic field image in the layered media is in good agreement with the research results of the layered ultrasonic field published by Professor Kundu in 2007.In this paper,the influence of point source density on spatial sound pressure field is also investigated.In this paper,the influence of point source density on the spatial sound pressure field is also investigated.It is concluded that the simulation of the sound pressure field is stable and close to the theoretical value when the point source radius is less than ?50/.These work provide a basis for the future simulation of the broken ultrasonic field,but also for the simulation of multi-layer media sound pressure field provides a theoretical basis.