A field balancing method of flexible rotors based on modal analysis and fourier transform

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (11) : 7-10,2.

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A field balancing method of flexible rotors based on modal analysis and fourier transform

ZHANG Yun1, MEI Xue-song1,2, ZOU Dong-lin1, JIANG Ge-dong1, ZHANG Dong-shen1

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Abstract

A field balancing method of flexible rotors is presented to suppress vibration from imbalance. In this method, rotor system dynamic model is established with FEM theory, and the differential equation of motion is expanded with the system mode shapes. By using FFT and IFFT transform, the unbalanced load spectrum in frequency domain is acquired, and then the rotor imbalance was eventually identified. Simulation and experimental results show that this method can identify the rotor imbalance accurately, which only needs to collect data of vibration response below critical speed without trial weights. Adding the counterweight, the imbalance vibration in each steps frequency of the rotor can be effectively suppressed.

Key words

field balancing / flexible rotor / modal analysis / FFT transform

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ZHANG Yun;MEI Xue-song;ZOU Dong-lin;JIANG Ge-dong;ZHANG Dong-shen. A field balancing method of flexible rotors based on modal analysis and fourier transform [J]. Journal of Vibration and Shock, 2012, 31(11): 7-10,2