Qualitative Analysis of Forced Response of Blisks With Friction Ring Dampers

TL;DR

This paper analyzes the nonlinear forced response of blisks with friction ring dampers in turbomachinery, using a lumped parameter model and multi-harmonic balance method to evaluate damping performance and provide design insights.

Contribution

It introduces a lumped parameter model and a combined numerical method to analyze the nonlinear damping behavior of friction ring dampers in blisks.

Findings

Friction ring dampers effectively dissipate vibrational energy in blisks.

The damping performance depends on damper characteristics and excitation configurations.

Design guidelines for optimizing friction ring dampers are proposed.

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 multi-harmonic 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.