scholarly journals ДОСЛІДЖЕННЯ ВІДБИТТЯ УЛЬТРАЗВУКОВИХ ХВИЛЬ ВІД ОДНОШАРОВИХ ТЕКСТИЛЬНИХ ПОЛОТЕН ТА ДВОШАРОВИХ ТЕКСТИЛЬНИХ ПАКЕТІВ ІЗ РІЗНИМ РОЗМІРОМ ПОР

2021 ◽  
Vol 148 (4) ◽  
pp. 87-97
Author(s):  
В. Г. Здоренко ◽  
С. В. Барилко ◽  
С. М. Лісовець ◽  
Д. О. Шипко ◽  
В. М. Василенко ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Spatial Structure ◽  
Single Layer ◽  
Ultrasonic Waves ◽  
Textile Material ◽  
Total Thickness ◽  
Complex Reflection Coefficient ◽  
Textile Materials ◽  
Complex Reflection ◽  
Textile Fabrics

Investigate the influence of single-layer textile fabrics and two-layer textile bags on the parameters of ultrasonic waves that interact with them. In particular, to investigate the dependence of the complex reflection coefficient of ultrasonic waves on the total thickness and basis weight of textile material. Methodology. The analytical part of the study consisted in obtaining an expression for the complex reflection coefficient of ultrasonic waves and in modeling its dependence on the thickness and basis weight of different textile materials. The proposed method of control of these technological parameters consists in irradiation of textile materials with ultrasonic waves with the subsequent reception of the waves reflected from textile material, their digitization and carrying out the computer analysis of the received results. Findings. Analytical expressions are obtained that relate the thickness and basis weight of single-layer canvases, two-layer textile bags with a complex spatial structure, on the one hand, and the reflection coefficient of ultrasonic waves from such materials, on the other hand. Analytical calculations were made and mathematical modeling was performed based on the results of theoretical research. Originality. As a result of theoretical studies, it is determined how the thickness and properties of each  of  the  two layers  of porous textile  materials  affect  the  reflection of  ultrasonic  waves.  This  makes it possible on the basis of ultrasonic measurements to determine both the total thickness of textile materials and their basis weight with the accuracy required for their production.  Practical  value.  The  obtained  analytical  dependences  are  another  step  towards  the  creation  of control and measuring equipment to determine the properties of single-layer textile fabrics and two-layer porous  textile  bags.  This  will  help  determine  the  overall  thickness  and  basis  weight  of  materials  with  a complex spatial structure.

scholarly journals ВІДБИТТЯ УЛЬТРАЗВУКОВИХ ХВИЛЬ ВІД ДВОШАРОВОГО ПАКЕТУ ТЕКСТИЛЬНИХ МАТЕРІАЛІВ ЗІ ЩІЛЬНИМ ВЕРХНІМ ШАРОМ

2020 ◽  
Vol 144 (2) ◽  
pp. 62-70
Author(s):  
В. Г. Здоренко ◽  
С. В. Барилко ◽  
С. М. Лісовець ◽  
Д. О. Шипко ◽  
В. М. Василенко
Keyword(s):  
Reflection Coefficient ◽  
Ultrasonic Waves ◽  
Dense Layer ◽  
Complex Reflection Coefficient ◽  
Reflected Waves ◽  
Textile Materials ◽  
Complex Reflection ◽  
General Terms ◽  
Contactless Control ◽  
Small Change

Obtain and show in general terms the expression for the module of the complex reflection coefficient of ultrasonic waves from a two-layer package of textile materials with a dense first layer. The above is necessary for the possibility of research of contactless control of such materials. To analyze the process of reflection of waves from a controlled material, the method of superposition of sounding vibrations is used. In general terms, the expression for the complex reflection coefficient of ultrasonic waves from a two-layer package of textile materials with a dense first layer is shown. It is proved that taking into account the complete attenuation of the reflected waves in the layer of the first material, it is possible to simplify the basic expressions for the complex reflection coefficient from a package of textile materials. It is shown that the change in the amplitude of the reflected ultrasonic waves for the material presented in the work with a change in the thickness of its layers is very small. The change in the amplitude of the reflected waves for such materials mainly causes a dense first layer of package of textile materials. The dependences of the real and imaginary parts of the complex reflection coefficient of ultrasonic waves on a package of textile materials with a dense first layer are obtained, which will help analytically determine both the change in the amplitude of the waves and their phase shift caused by the interaction of these vibrations with the material. It is proposed to use the component expressions for the module of the complex reflection coefficient of ultrasonic waves, which will allow you to adjust the parameters of the contactless transducers for different two-layer package of textile materials with a dense surface layer. To ensure the possibility of determining a small change in the measured magnitude of the amplitude of the reflected ultrasonic waves from the two-layer package of textile materials with the first dense layer, you can use switching and modulation devices and transducers. This will eliminate the errors that may be associated with the non-identity of the measuring channels when determining a small change in the amplitude of the reflected ultrasonic waves.

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