Virtual Dynamic Balancing for Turbomachine Shafting with Multi-rotor Based on Dynamic Response Analysis

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 8-12.

Bin Guangfu1 Zhou Wei1 Wang Weiming2 Li Xuejun1

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Abstract

In order to solve the problem of dynamic balancing needed to be started many times for turbomachine shafting with multi-rotor, a virtual dynamic balancing method without trial weights for multi-rotor shafting based on dynamic response analysis is developed in this paper. According to the shafting structure size and operation parameters, the rotor dynamic finite element model was built by simulation technology. Unbalance excitation was applied in the node of finite element model corresponding to the balancing weighed position of multi-rotor respectively. Vibration response value of each measuring point on the shafting balancing speed can be obtained through the steady-state unbalance response analysis, which can replace through many times starting up trial weights to get the shafting weighted influence coefficient of specific balancing location in the process of field whole-machine dynamic balancing. Then, combined with the initial fundamental frequency response value of the shafting vibration measuring points, the required shafting balancing weighted of each rotor can be obtained through the vector calculation. The dynamic balancing experiment at the speed of 1200rpm without trail weights was taken by using the proposed method. The average amplitude reduction was up to 55%. The proposed dynamic balancing method can reduce shutdown times and probability of balancing failure due to the improper trial weight and test error. Moreover, it can also be applied to the field dynamic balancing for large flexible shafting.

Key words

shafting with multi-rotor / dynamic response / weighted influence coefficient / no trial weights / virtual dynamic balancing

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Bin Guangfu1 Zhou Wei1 Wang Weiming2 Li Xuejun1. Virtual Dynamic Balancing for Turbomachine Shafting with Multi-rotor Based on Dynamic Response Analysis[J]. Journal of Vibration and Shock, 2017, 36(18): 8-12

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