Predicting Turbine-Generator Foundation Vibrations

by J. P. Lee, Brown & Root, Inc, Houston, United States,
J. A. Bohinsky, Brown & Root, Inc, Houston, United States,

Abstract: Two of the major considerations in the design of large turbine-generator foundations are to maintain the proper shaft alignment and to limit the vibration of the machine during operation. To this end, a force-response analysis is generally performed to predict and hence to control the maximum vibration amplitude of the machine. This paper compares results of dynamic analyses using a detail finite element model, an approximate model, and a simplified models of a 22 mw, 3600 rpm turbine-generator foundation supported on piles. The results show that for the excitation forces involving low frequency contents, the approximate model B is adequate but the simplified model C is too crude since it neglects the soil-structure interaction effects. However, for the evaluation of vibration amplitudes due to unbalanced forces, the model c which does not include the mat nor the piles is adequate for this high frequency excitation forces.

Subject Headings: Machine foundations | Finite element method | Vibration | Pile foundations | Turbines | Dynamic models | Excitation (physics) | Foundation design

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