Kinetic Simulation Analysis of CT Spherical Tube Rotating Anode Rotor System

CT tube has the characteristics of high heat, high vacuum, high voltage, high precision, high speed, and high momentum, which makes the design of the rotor part technically difficult and is also a core technology that foreign medical giants focus on and control. Due to the impact of the dynamic performance of the rotating anode on the quality of X-ray production and the vibration and noise of the system, this article focuses on the rotating anode rotor system supported by liquid metal sliding bearings. The main research work is the working stability of the rotor structure, and modal analysis and coordinated response analysis were conducted on the rotor system, providing reference for the design of the rotor system. Firstly, the dynamics model of the rotor system is established and the modal analysis is carried out using the finite element method. The first six orders of modal vibration are selected for analysis. Then, according to the modal vibration results, the unbalanced excitation is applied to the system considering the influence of the eccentric load of the target plate. The harmonic response analysis is carried out. Finally, the stability of the rotor was investigated with different connecting molybdenum rod structures between the target plate and the bearing sleeve. The results showed that the solid shaft structure had the best stability.