ECCOMAS 2024

New concepts for nonlinear analysis of turbine blade-damper systems to support better decision making on design

  • Gastaldi, Chiara (Politecnico di Torino)
  • GOLA, Muzio (Politecnico di Torino)

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Matching a turbine blade with an Underplatform Damper (UD) is a severely intensive numerical process, that may have prohibitive computational costs. An alternative to using surrogate models is the combination of the Platform Centered Reduction proposed by these authors together with the Base Cycle approach and the completed by the Amplitude Layered (excitation) Force Mapping that makes the search of the nonlinear solution a convergence-free process. The combination of these "off the beaten path" procedures reduces the numerical load to an unprecedented minimum in Mode 1 blade vibration, where the UD is most effective. This presentation discusses some concrete applications of these new logically consequential concepts, showing how they can be translated into a method for blade-damper matching and finding the most appropriate combination of design parameters.