Kharchenko Serhii, Samborski Sylwester, Kharchenko Farida, Mitura Andrzej, Paśnik Jakub, Korzec Izabela
Department of Applied Mechanics, Lublin University of Technology, 20-618 Lublin, Poland.
Department of Fundamentals of Production Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel). 2023 Aug 22;16(17):5735. doi: 10.3390/ma16175735.
The reliability of perforated vibrosurfaces is one of the main parameters of the efficiency of their operation in many technological processes. Existing methods for studying vibrosurfaces with standard single holes and the corresponding results cannot be used to study the reliability of vibration surfaces with holes of complex geometric shapes. The proposed method is based on the experimental modal identification of the parameters of natural oscillations, the parallel creation of a numerical model using the finite element method, and the comparison of the results. Three vibrosurfaces were investigated: solid without holes, perforated with standard round holes, perforated with holes in the form of a five-petal epicycloid. As a result of experiments, the divergence of natural vibrations of perforated surfaces depending on the side of the punch and matrix during their technological production by pressing was established. The result of the research was a refined adequate numerical model that takes into account the presence of holes in complex geometric shapes. A methodology has been developed, and analytical expressions with perforation coefficients have been obtained, which allow obtaining values of natural oscillations of vibration surfaces depending on the properties of metal, boundary conditions, and structural and kinematic parameters.
多孔振动表面的可靠性是其在许多工艺过程中运行效率的主要参数之一。现有的研究带有标准单孔振动表面的方法以及相应结果，无法用于研究具有复杂几何形状孔的振动表面的可靠性。所提出的方法基于对固有振动参数的实验模态识别、使用有限元方法并行创建数值模型以及结果比较。研究了三种振动表面：无孔实体、带有标准圆孔的多孔表面、带有五瓣外摆线形式孔的多孔表面。实验结果表明，在通过冲压进行工艺生产过程中，多孔表面的固有振动会因冲头和模具的不同而产生差异。研究结果是一个经过改进的、考虑了复杂几何形状孔存在的适当数值模型。已经开发出一种方法，并获得了带有穿孔系数的解析表达式，这些表达式能够根据金属特性、边界条件以及结构和运动学参数来获取振动表面的固有振动值。
