Summary
This study addresses the dynamic response variability in friction-damped structures, with a focus on the uncertainty stemming from the non-uniqueness of residual tractions. Utilizing a recently developed Nonlinear-Mode based method, we first perform uncertainty quantification on amplitude-dependent modal parameters through a surrogate model-based optimization, and then obtain frequency response bounds with an interval analysis. The benchmark consists of realistic turbine blades coupled with an underplatform damper. Results reveal significant variability in the dynamic behavior of the structure, and the effectiveness of the method is demonstrated with accurately-captured response bounds.
