The High-speed Dynamic Balancing Method for Large Steam Turbine Low Pressor Rotor Basedon Modal Shape Analysis

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (14) : 87-92.

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The High-speed Dynamic Balancing Method for Large Steam Turbine Low Pressor Rotor Basedon Modal Shape Analysis

Bin Guangfu1, 2, He Lidong1, Gao Jinji1, Li Libo3

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Abstract

Using the conventional influence coefficient method in the high-speed dynamic balancing machine
is usually difficult to balance some large flexible rotors, a new method for large steam turbine LP rotor
balancing based on mode shape analysis was developed in this study. Analyzing of the steam turbine rotor
system structure with the dynamic characteristics of dynamic balancing machine, the rotor-bearing-pedestal
system model was established by using DyRoBeS software to get the critical speed and model shape of rotor
system. Then, a reasonable balance process including balancing planes and speed points was designed based
on model shape combined with influence coefficient method of flexible rotor. The balancing method by order
time was adopt to meet dynamic balancing requirements of this kind of large special rotor. Finally, a large
660MW steam turbine LP-rotor produced by Harbin Turbine Company Limited was taken as an example. The
application result shows that the proposed method can balance large flexible rotor effectively, reduce balancing
number, and save balancing cost.

Key words

steam turbine LP-rotor / high-speed dynamic balancing / modal shape analysis / influencecoefficient method / balancing by order time

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Bin Guangfu;;He Lidong;Gao Jinji;Li Libo. The High-speed Dynamic Balancing Method for Large Steam Turbine Low Pressor Rotor Basedon Modal Shape Analysis[J]. Journal of Vibration and Shock, 2013, 32(14): 87-92