Numerical Simulation Of Acoustic Pressure In Ultrasonic Flaw Detection And 3D Simulation Of Radiated Acoustic Wave

Directing questions that NDT ultrasonic sound field is currently unable to theoretical calculations, in order to take advantage of the physical properties of ultrasound wave equation and numerical solution by the piezoelectric wafer disc piston sound source as ultrasonic radiation research.Considering the actual spherical sound field radiation pulse wave, acoustic reflection and refraction of sound pressure changes and other factors, it summed up on the sound source direction parallel to the vertical direction of the sound source and the three-dimensional wave equation of time and initial and boundary conditions. Useing numerical simulation software MATLAB for second-order wave equation to find Finite Difference Method for solving for the actual sound source disc ultrasound field sound pressure on the location of the sound field function, and calculate the ultrasonic radiation in the road.,reflection, refraction of sound pressure and sound after the initial pressure ratio,and plotted at different times on the sound source direction parallel to the vertical direction of the sound source and the sound pressure of an image, a sound source from the sound source on the axis distance, time and sound pressure image. Solid sound field-specific features to be considered,is summed up the solid improvement in the sound field sound pressure equation solving and make the corresponding image. Thesis which is in order to improve the sound image field images provide the basis for the simulation accuracy, and can give a more intuitive changes due to other causes of ultrasound, echo the conclusions of the various factors affecting the ratio of initial wave may be practical reference.