Abstract
Integrally bladed disks (blisk) have been widely used in the turbo-machinery industry due to its high aerodynamic performance and structural efficiency. A friction ring damper (FRD) is usually integrated in the system to improve its low damping. However, the design of the geometry of this FRD become complex and computationally expensive due to the strong nonlinearities from friction interfaces. In this work, we propose an efficient modelling strategy based on advanced nonlinear modal analysis and Kriging surrogate models to design and optimize the geometry of a 3D FRD attached to a high fidelity full-scale blisk. The 3D ring damper is parametrised with a few key geometrical parameters. The impact of each geometric parameter and their sensitivities to nonlinear dynamic response can be efficiently assessed using Kriging meta-modelling based on a few damped nonlinear normal modes. Results demonstrate that the damping performances of ring dampers can be substantially optimized through the proposed modelling strategy whilst key insights for the design of the rings are given. It is also demonstrated that the distribution of the contact normal load on the contact interfaces has a strong influence on the damping performances and can be effectively tuned via the upper surface geometry of the ring dampers.
Highlights
Industrial turbomachines are very important components in power generators and aircraft engines
Two other views are given: a side view that gives the envelopes of the damped nonlinear normal modes (dNNMs) properties versus the |qres, z| and the dNNM calculated from the default geometries [0, 0, 0] is highlighted by the black dashed curves, and a top view
A comprehensive investigation on the impact of the geometry of a friction ring damper (FRD) on its damping performances was conducted in this work
Summary
Industrial turbomachines are very important components in power generators and aircraft engines. A strong focus has been put so far by academics and industrials on the study of the impact of friction dampers geometry by designing and comparing different shapes, as wedge dampers (Krack et al 2014; Pesaresi et al 2017; Yuan et al 2020), cylindrical dampers (Panning et al 2002), conical dampers (Denimal et al 2021b), asymmetric dampers (Gastaldi et al 2018; Hüls et al 2018), FRDs (Tang and Epureanu 2019; Sun et al 2021b) or others. The first works for the design of friction dampers were based on large parametric studies, as they allow to get insights in the influence of different parameters. Previous studies have all demonstrated that a change in the contact normal load will have a strong influence on the damping properties.
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