RESEARCH OF ATTENUATION OF ULTRASONIC WAVES AT THEIR PASSAGE AND REFLECTION FROM SINGLE-LAYERED MATERIALS WITH PORES OF DIFFERENT SIZES

Abstract

Research of attenuation of ultrasonic waves in various single-layer materials with available pores of different sizes changes in this work. The above is necessary for the possibility of creating non-contact means of ultrasonic testing of such materials. In the work to analyze the processes of interaction of ultrasonic waves with single-layer materials and various changes depending on the thickness or basis weight of the material. Expressions are given for the modules of the complex coefficient of transmission and reflection of ultrasonic waves from single-layer materials with small pores, as well as from textile single-layer materials with through pores, through which most of the vibrations pass. The dependences of relative changes in the amplitude attenuation of waves on the oscillation frequency, thickness and basis weight of the material are given. It is shown that the attenuation of the amplitude of ultrasonic waves that interact with single-layer materials with small pores, and the damping of vibrations for single-layer textile fabrics can be very different from each other. This difference is caused by the bending of part of the sound waves of the fibers of textile fabrics with through pores during the interaction of vibrations. The dependences of the relative changes in the difference of the modules with and without attenuation are obtained for the complex reflection and transmission coefficients of ultrasonic waves. These vibrations interacting with single-layer materials with different pores are considered taking into account the frequency of ultrasonic waves, pore sizes, thickness or basis weight of the material itself. The obtained dependences for determining the attenuation of the amplitude of the probe ultrasonic waves on the structure, porosity of the material, its thickness or surface density. This will allow to create non-contact control tools for materials with complex internal structures and automatically configure them to change pore sizes, which can significantly affect the errors of such devices. The accuracy of the devices that will be tuned to the complex structure of the monolayer material being controlled will be affected precisely by the attenuation parameter of the probe oscillations. In the future, this line of research will make it possible to create non-contact methods and means of monitoring the technological parameters of various single-layer materials and integrate such devices and systems directly into the production process.