Study on online active balancing system of rotating machinery and target control method

In order to reduce the unbalance vibration of the rotating machinery automatically during the work process, a new type of liquid-transfer active balancing system was proposed. In the system, a balancing disc divided into four liquid storage chambers was mounted on the rotor. When the unbalance response of the rotating machinery was higher than the limiting value, compressed air was injected to the target chambers and drove the balancing liquid to transfer between opposite chambers. Through the liquid redistribution in the balancing disc, a correction mass was generated to compensate the initial unbalance. The balancing device could be mounted both in the middle of rotor and at two ends. A target control method utilizing influence coefficients was also proposed to determine the balancing target and calculate the time of gas injection. Different control paths would generate different balancing effects, so simulations on several control paths were done to find the optimal solution. In addition, two experimental devices were constructed and active balancing experiments were carried out to verify the feasibility and availability of the balancing system. Key-Words: Rotating machinery; Unbalance vibration; Active balancing; Liquid transfer; Compressed air; Target control