Study on modal dynamic balance method of bearing rotor system

Abstract In order to make dynamic balance for bearing rotor system with unbalanced vibration, a modal balancing method for bearing rotor system is proposed. The vibration of the rotor is decomposed into multi-order components according to vibration mode, the unbalanced components are balanced step by step, and the correction amount of each unbalance is solved by establishing a modal matrix equation. Through simulation analysis, it can be seen that under different conditions of speed and unbalance, the amplitude of the rotor after dynamic balace is greatly reduced, and the average vibration is reduced by more than 70%. This method can suppress vibration effectively for bearing rotor system and improve running performance of high speed bearing rotor system.