As demanded for parameter estimation based on the measured signals, a model-based method to estimate the unbalance distribution of steam turbine-generators due to unbalance response was proposed in this paper. The equivalent modal damping ratios for each mode estimated by GA from the measured Bode plots are incorporated into the modal models. A finite number of the modes are used to calculate the influence coefficient matrix. Finally, the equivalent unbalance distribution on the selected correction planes is estimated based on the measured responses. The merit of this approach is that no test run of trial mass is required. The feasibility of this method is demonstrated using a steam turbine-generator. The method presented not only provides a useful means for balancing work, but also can be further developed into an identification and diagnosis tool.

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