Abstract: As a new type of liquid automatic balancing system, the pneumatic-liquid online automatic balancing system has the advantages of simple structure, no moving parts in the rotating part, closed action environment, reversible balancing process and can be held after stopping, etc. Compared with other forms of online automatic balancing systems, it is more suitable for large-scale rotating equipment. The composition and working principle of the online automatic balancing system are introduced, based on the actual structure of a rotor with a maximum diameter of 500 mm, the finite element model has been established. The dynamics of the rotor-bearing-single/double balancing actuator system has been quantified, according to which the balancing actuator was designed to change the dynamics of the rotor system by less than 2%. The vibration suppression effect of single/double actuators has been simulated, and the amplitude of the rotor has dropped by more than 70%. The experiment illustrates that the single-sided automatic balancing experiment achieves the reduction of rotor amplitude from 18.6 μm to 10.6 μm, which verifies the feasibility and effectiveness of the balancing system; the reduction of rotor amplitude from 17.8 μm to 4.6 μm by double-sided dynamic balancing which lays the technical foundation for the subsequent double-sided automatic balancing research.

Key words: large-scale rotating equipment, automatic balance, pneumatic-liquid type, dynamic characteristics simulation, structural optimization design