Abstract
The paper deals with the modelling of turbine rotors, including a foundation and stator parts, and with their dynamic analysis. The dynamics of turbines can be strongly influenced by the effects of a rotor foundation, and therefore suitable modelling approaches should be developed to obtain proper analysis tools. The standard methods for the modelling of rotating shafts are summarized in the paper, and two approaches to including foundation effects into dynamic models are introduced. The approach based on the dynamic compliance of the foundation with respect to the rotor angular velocity is compared with the approach based on the modal synthesis of rotor and foundation models. The calculation of modal properties is then demonstrated, and the characteristics of both presented methods are discussed. A comparison of the steady-state dynamic response calculated using both methods is shown. It can be concluded that both approaches can be advantageously used for several analyses, and our final recommendations are given in the conclusions.
Highlights
Rotor dynamics remain one of the most important mechanical branches of many real industrial problems [1,2]
The rotordynamics of large turbosets is a topic that still has importance mainly related to the production of new, highly effective power plants
This paper was aimed at the problem of the foundation incorporation into the model usable in rotor dynamics and general vibration analyses of the whole system
Summary
Rotor dynamics remain one of the most important mechanical branches of many real industrial problems [1,2]. Various design methods of rotor and foundation couplings are summarized in [9] It was suggested by [10] to consider the foundation effects in models. More detailed analyses of a modal approach for the supporting structure incorporation in rotor dynamics are discussed in [16,17]. Krylov-based method to the model order reduction for a system composed of a housing, bearings and a rotor is presented in [23]. Two approaches for the consideration of foundation effects in rotor models are introduced in Sections 3 and 4.
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