Estimating Turbo-Generator Foundation Parameters
MG Smart, MI Friswell, AW Lees & U Prells (University of Wales Swansea)
IMechE Journal of Mechanical Engineering Science, Vol. 212(C8), 1998, pp. 653-665
Turbogenerators in power stations are often placed on foundation structures which are flexible over the running range of the machine, and which can therefore contribute to its dynamics. Established methods of obtaining structural models for these foundations, such as the finite element method or modal testing, have proved unsuccessful because of complexity or cost. Another method of foundation system identification, using the unbalance excitation applied by the rotor itself during maintenance run-downs, has previously been proposed, but has not yet been experimentally verified. In this paper the necessary theory is developed, and certain issues critical to the success of the estimation are examined. The method is tested in both simulation and experiment using a two bearing rotor rig and good fits between model and measurement are obtained. The predictive capacity of the estimated models when the system is excited with a different unbalance are not as good, and it is surmised that this may be due amongst other things to inaccurate bearing models.
This material has been published in the IMechE Journal of Mechanical Engineering Science, Vol. 212(C8), 1998, pp. 653-665, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by the IMechE.
Link to paper using doi:10.1243/0954406981521420
IMechE Journal of Mechanical Engineering Science on PE Publishing website