Information Technology in the Computer-aided Design and the Calculation of Automobile Parts
Keywords:
NATURAL FREQUENCIES, DEFLECTED MODE, LOCAL STRESS CONCENTRATION, EAR, MODELLING, FINITE-ELEMENT MESHAbstract
The dynamic finite-element model plays a key role in solving the complex problem of ensuring the vibration strength of the product structure. The modern computer technology, software products, test and measuring complexes allow to create a detailed model of the product design, and, on the basis of the experiment, to rebuild and confirm its reliability. The solution of these problems is possible in modern FE analysis systems. The ANSYS program is one of the most versatile, developing and popular systems of the finite element analysis among specialists engaged in the automated engineering calculations (CAE, Computer-Aided Engineering). The finite-element model of the automobile part is a reliable tool for analyzing the strength of the product when changing conditions of its operation, changes in its design, as well as when creating new products of the similar class. The methodological value of this study is in the development of the algorithm to determine the natural frequencies and modes (modes) of the ear natural oscillations and the equivalent stresses arising near the hole by means of the modal analysis in the ANSYS. The issue of assessing the local stress concentration near the ear holes, as well as their effect on the strength changes in the part is of practical
interest. The object of the study is an ear, which is an element of the «ear-fork» connection. When constructing the algorithm, the calculation of the determination of natural frequencies and modes (modes) of the ear natural vibrations is based on the modal analysis (the determination of natural frequencies and modes (modes) of natural vibrations). The task was solved by the finite element method in the ANSYS Workbench package. The solution method and the performed modal analysis helped to establish the oscillation parameters of the ear model: the natural frequencies and modes of vibrations, resulting maximum and minimum displacements, equivalent stresses for the corresponding natural frequencies were determined. Using this technique, it is possible to prevent the dangerous stresses in structures by simulating the measures to eliminate resonant frequencies in the model of the investigated automobile part.
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