With the development of high-speed rotating machinery, the unbalance vibration feature of each rotor system has a greater influence on the work efficiency, bearing life, operational time, etc. Therefore, an active balancing system is necessary to automatically reduce the unbalance vibration in the process of rotor operation. This study introduced a novel liquid transfer active balancing system for the hollow rotors, and compensation mass was performed by balance liquid transmission between two pairs of contra-positioned chambers. The performance of this new balance actuator was analyzed, including balancing velocity, balancing accuracy, and the effect on rotor dynamics. A monitoring and control program was constructed to control the balance actuator. Two extraction methods of synchronic vibration were introduced and quantitatively compared through simulation. A control program was developed and the control accuracy was within 1 ms. Furthermore, the effectiveness of the new balancing system was verified through active balance experiments and the maximum speed was 15,600 rpm. The results indicate that the balancing system could effectively decrease the unbalance vibration of the rotor system within 10 s, and the amount of decrease was more than 80%.
Analyze the origins of the vibration according to the expressions during aero-engine running. Study the vibration principle. Create the fault tree of the aero-engine vibrating failure. And with the fault tree analyze the common vibrating failure during production process. Generalize the diagnosing and debugging-aid methods for aero-engine vibrating failure.
Study the effect of the blade’s aspect ratio and thickness on rotating vibration according as modulating frequency can reduce the resonance vibration of the blades. Research the modal analysis of the blades of the aero-engine. Apply the software of a finite element method (FEM) to simplify calculating process. Establish three finite element models of the blade. Calculate and analyze the natural frequency and mode of each blade. Analyze the local resonance which is caused by the wake flow exciting force in the different conditions of the engine. The structure of the blades should be right for the engine conditions which make the vibration frequency of the blades out of the resonance vibration scope.
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