Abstract: This paper investigates the dynamic characteristics of tilting-pad bearings and their influencing factors, aiming to eliminate unstable vibration during the operation of the material suction fan in vertical milling and boring equipment. A solving method based on linear superposition of pad performance is adopted to analyze pressure distribution features, dynamic characteristic coefficients and frequency responses under two lubrication models of starved lubrication and flooded lubrication. The results show that with the increase of load, the stiffness coefficients of the tilting-pad bearing rise and the damping effect is enhanced, while the vibration absorption capacity of the system declines, making the bearing system prone to severe vibration response. Under the starved lubrication model and reduced oil supply conditions, both the stiffness and damping coefficients of the bearing decrease with rising rotational speed, resulting in poor dynamic performance. For the starved lubrication model, the damping ratio first rises and then falls as the rotational speed increases, and gradually stabilizes after reaching a certain rotational speed. The findings provide a theoretical basis for vibration response analysis, optimal design and fault diagnosis of tilting-pad bearings and material suction fans.

Key words: tilting-pad bearing, stiffness coefficient, damping ratio, oil supply, frequency response