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Numerical Study of the Natural Oscillations of Perforated Vibrating Surfaces with Holes of Complex Geometry
 
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1
Department of Applied Mechanics, Lublin University of Technology, 20-618 Lublin, Poland
 
2
Department of Fundamentals of Production Engineering, Lublin University of Technology, 20-618 Lublin, Poland
 
3
Sumy National Agrarian University, 160 Herasyma Kondratieva Street, Sumy, 40000, Ukraine
 
4
Department of Machine Design and Mechatronics, Lublin University of Technology, 20-618 Lublin, Poland
 
 
Corresponding author
Serhii Kharchenko   

Department of Applied Mechanics, Lublin University of Technology, 20-618 Lublin, Poland
 
 
Adv. Sci. Technol. Res. J. 2023; 17(6):73-87
 
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ABSTRACT
The widespread use of perforated vibrating surfaces in various industries requires maximum productivity and construction reliability. The research task is to determine the significant factors and their degree of influence on the natural oscillations of vibrating surfaces with multiple holes of complex geometry. For this purpose, studies were carried out for three samples of plates: non-perforated, with basic round holes and holes of complex geometry in the form of a five-petal epicycloid. Studies of the natural oscillations of perforated vibrating surfaces have been conducted using the finite element method in Abaqus, which has proved sufficient accuracy of calculations. The dependencies of the natural oscillation frequency of perforated surface samples on their thickness, partition width between the holes, material type, and fixing method have been obtained. In addition, the analysis involved the study of eight modes of oscillation common in practice. The dependencies of the natural oscillation frequency of perforated surface on the relative parameters of ligament efficiency and stiffness coefficient have also been obtained. These parameters take into account the ratios of the partition width between the holes to the plate thickness and the dimensions of the holes. The research results allow to obtain levels of influence of the perforated vibrating surface parameters on their natural oscillations frequency. The obtained research results make it possible to further determine the absence of damage between the holes and predict the durability of perforated vibration surfaces in the presence of holes of complex geometry.
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