Nonlinear Modal Analysis of Frictional Ring Damper for Compressor Blisk

Abstract

The use of integrally blisk is becoming popular because of the advantages in aerodynamic efficiency and mass reduction. However, in an integrally blisk, the lack of the contact interface leads to a low structural damping compared to an assembled bladed-disk. One emerging damping technique for the integrally blisk is based on the use of friction ring damper which exploits the contact interfaces at the underneath of the disk. In this paper, three different geometries of the ring dampers are investigated for damping enhancement of a blisk. A full-scale compressor blisk is considered as a case study where a node to node con- tact model is used to compute the contact forces. The dynamic behaviour of the blisk with the ring damper is investigated by using nonlinear modal analysis which allows a direct estimation of the damping generated by the friction interface. The damping performance for the different ring dampers are evaluated and compared. It appears that the damping efficiency as well as the shift in the resonant frequency for the different geometries are highly related to the nodal diameter and contact pressure/gap distributed within contact interface. The geometry of the ring damper has significant impact on the damping performance.

Effects of the Geometry of Friction Interfaces on the Nonlinear Dynamics of Jointed Structure

“…The energy dissipation from friction interfaces can effectively reduce the vibration level and mitigate the risk of high-cycle fatigue failures. Similar examples can also be found in the design of ring dampers for blisks [2]. However, an accurate prediction of the dynamics of the structure with friction interfaces remains a challenge due to complex physics at the friction interface [3].…”

Geometric design of friction ring dampers in blisks using nonlinear modal analysis and Kriging surrogate model

“…The general overview of the workflow for the modelling process and computation of the nonlinear dynamic response of the blisk with a FRD is introduced as shown in Fig. 2 and has already been introduced in details in Sun et al (2021b). Each step will be detailed in the following.…”

“…The shape and the geometry of friction dampers have a strong impact on the dynamic of blades as they modify its mass (Laxalde et al 2010), the contact geometry (Panning et al 2002;Sun et al 2020) and the contact position (Niemotka and Ziegert 1995;Sun et al 2020). 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. All results demonstrate without ambiguity that the shape of such component has a major impact on the dynamic of bladed discs.…”

“…In Panning et al (2002), the mass and the platform angle are also studied based on the HBM for the computation of the nonlinear FRF and on a parametric study. Finally, in Sun et al (2021b) a full 3D FE model of a blisk and of a FRD is studied and three different geometries of the FRD are compared. The nonlinear response is obtained using the damped nonlinear normal modes (dNNMs).…”

“…To focus on the case of FRDs, Tang and Epureanu (2019) tested several different cross sections of the FRDs using the nonlinear FRF. Whereas, results in Sun et al (2021b) show that changing the cross section of the FRDs has limited effects on its damping performance (Sun et al 2021b). However, the impact of the circumferential geometry of the FRDs has never been considered, which is the main objective of the present study.…”