Dynamic Characteristics Analysis and Experimental Investigation of Aero-Engine Rotor System Supported by Elastic Rings

This study investigates the stiffness characteristics of elastic ring supports and the dynamic response of aero-engine rotor systems. First, comparative analysis demonstrates that the finite element model provides higher accuracy in predicting the stiffness of the elastic ring compared to traditional analytical methods, with the experimental error controlled within 5%. Grid independence verification further reveals that the mesh density in the boss region is a critical factor determining the accuracy of stiffness calculations. On this basis, the influence mechanism of contact states on stiffness characteristics was deeply explored; it was found that the transition between frictional and bonded contact states can lead to a stiffness deviation of up to 46.8%. Furthermore, quantitative analysis of manufacturing tolerances indicates that the thickness deviation of the boss should be strictly controlled within 0.02 mm to ensure the stability of support performance. Finally, a dynamic model of the rotor system developed using two-dimensional beam elements was fully validated against experimental data, with a calculation error of only 2%. The results of this study provide an important reference for the precise design and stiffness evaluation of elastic ring supports, as well as the engineering testing of rotor system dynamic characteristics.