Dynamic analysis and forced response of a rotor-bearing system using the finite element method

Tóm tắt

This paper presents a comprehensive dynamic investigation of a rotor-bearing system using the finite element method (FEM). The modeled system comprises a uniform shaft, two disk masses, an elastic coupling, and two journal bearings. A numerical model is developed using beam elements with eight degrees of freedom (DOFs) per element, leading to the assembly of global mass, damping, gyroscopic, and stiffness matrices. Modal analysis is performed to extract the natural frequencies and associated mode shapes. In addition, the study includes static deflection analysis, Campbell diagram construction, and forced vibration simulations under unbalanced excitation. The results highlight critical rotational speeds and key dynamic behaviors essential for ensuring the reliable and efficient operation of high-speed rotating machinery. These findings provide valuable insights for the design, balancing, and predictive maintenance of rotor-bearing systems.