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- Title
Parametric study for model calibration of a friction-damped turbine blade with multiple test data.
- Authors
Ferhatoglu, Erhan; Botto, Daniele; Zucca, Stefano
- Abstract
Model updating using multiple test data is usually a challenging task for frictional structures. The difficulty arises from the limitations of nonlinear models which often overlook the uncertainties inherent in contact interfaces and in actual test conditions. In this paper, we present a parametric study for the model calibration process of a friction-damped turbine blade, addressing the experimentally measured response variability in computational simulations. On the experimental side, a recently developed test setup imitating a turbomachinery application with mid-span dampers is used. This setup allows measuring multiple responses and contact forces under nominally identical macroscale conditions. On the computational side, the same system is modeled in a commercial finite element software, and nonlinear vibration analyses are performed with a specifically developed in-house code. In numerical simulations, the multivalued nature of Coulomb's law, which stems from the inherent variability range of static friction forces in permanently sticking contacts, is considered to be the main uncertainty. As the system undergoes vibration, this uncertainty propagates into the dynamic behavior, particularly under conditions of partial slip in contacts, thus resulting in response variability. A deterministic approach based on an optimization algorithm is pursued to predict the limits of the variability range. The model is iteratively calibrated to investigate the sensitivity of response limits to contact parameters and assembly misalignment. Through several iterations, we demonstrate how uncertain initial contact conditions can be numerically incorporated into dynamic analyses of friction-damped turbine blades. The results show a satisfactory level of accuracy between experiments and computational simulations. This work offers valuable insights for understanding what influences test rig response and provides practical solutions for numerical simulations to improve agreement with experimental results.
- Subjects
TURBINE blades; STATIC friction; COULOMB'S law; PARAMETRIC modeling; OPTIMIZATION algorithms; WIND turbine blades; CALIBRATION; DAMPERS (Mechanical devices)
- Publication
Nonlinear Dynamics, 2024, Vol 112, Issue 10, p7847
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-024-09396-z