Dynamic Characteristics Analysis of Hollow Shafts Based on Higher Order Shear Theory

This paper investigates the dynamic characteristics of hollow shaft rotor systems using a higher-order shear deformation theory (HOSDT). The authors based on the HOSDT and combined with the finite element method, a novel finite element model has been established, enabling rapid modeling and dynamic characteristic analysis of hollow shaft rotor system models with arbitrary dimensional parameters. And compare its performance with classical beam theories (Euler-Bernoulli and Timoshenko) and 3D solid element simulations in ANSYS. They analyze modal analysis, unbalanced response analysis, and stress computation. The results suggest that the HOSDT model offers superior accuracy compared to classical beam theories, especially for short, thick beams and thin-walled beams where shear effects are prominent, while also providing computational advantages over 3D solid element models. The study addresses the limitations of classical beam theories in accurately capturing shear effects in hollow shaft rotor systems, particularly in short, thick, and thin-walled scenarios. While 3D FEA can provide accurate results, it comes with high computational cost. The proposed HOSDT-based FEA model provides a balance between accuracy and computational efficiency. The application of HOSDT to hollow shafts and the comparative analysis with existing methods represent a valuable contribution.