Prediction of the Static/Dynamic Stiffness of Coupling Sections of Rotating Systems

Abstract

The coupling section of rotating systems is a very important factor to determine their static/dynamic stiffness. To ensure the proper performance of the machine tool, the static/dynamic stiffness of the rotating system has to be predicted. Various parameters of the coupling section in rotating systems, such as the spring element, the node number and preload influence the characteristic of rotating system. This study focuses on the prediction of the static and dynamic stiffness of the rotating system with coupling section using the finite element (FE) model. To represent the coupling section of the rotating system, finite element method (FEM) computations on preload effect and the spring element arrangement were performed carried out. MATRIX 27 in ANSYS is the proper spring element to describe the coupling section of the rotating system because the MATRIX 27 can describe the coupling section close to the real object and is applicable to various rotating systems. The preload effect on the coupling section was estimated on the basis of the HERTZIAN contact theory. On the other hand, technical data for the specific ball bearings were obtained from bearing manufacturers. The FE model of the couple section which has the sixteen node using MATRIX 27 was constructed. Comparisons between FEM predictions and experimental results were performed in terms of the static and dynamic stiffness.