Qualitative analysis of forced response of blisks with friction ring dampers

Abstract

A damping strategy for blisks (integrally bladed disks) of turbomachinery involving a friction ring is investigated. These rings, located in grooves underside the wheel of the blisks, are held in contact by centrifugal loads and the energy is dissipated when relative motions between the ring and the disk occur. A representative lumped parameter model of the system is introduced and the steady-state nonlinear response is derived using a multiharmonic balance method combined with an AFT procedure where the friction force is calculated in the time domain. Numerical simulations are presented for several damper characteristics and several excitation configurations. From these results, the performance of this damping strategy is discussed and some design guidelines are given.

Effects of mistuning on dynamic behavior of nonlinear cyclic systems with lump masses and cubic nonlinearity

“…A damping strategy for bladed disks of turbomachinery involving a friction ring is investigated by Laxalde et al [50]. Shin et al [51] investigated the vibration localization phenomena due to mistuned coupling stiffness.…”

Reduced-order modelling using nonlinear modes and triple nonlinear modal synthesis

“…Many reduced-order modelling techniques dedicated to the mistuning of bladed disk can be found in the literature [33][34][35][36][37][38][39][40], and prove very efficient as long as the study is focused on linear structures. However, taking into account nonlinearities in the simulations can be of primary importance in the design process since they are known to have a strong impact on the vibration level, as pointed out in several numerical and experimental investigations [41][42][43]. A detailed review on vibration prediction of bladed disks in the presence of friction phenomena can be found in [44].…”

Nonlinear vibrations of a mechanical system with non-regular nonlinearities and uncertainties

“…The last case considers the rubbing phenomena with friction dissipation mechanism and stick-slip motion [18,19], as illustrated in Figures 3(b) and (e). The nonlinear forces f nl 1 (t) due to friction is expressed, according to the Coulomb law, as:…”