Effects of Damping and Varying Contact Area at Blade-Disk Joints in Forced Response Analysis of Bladed Disk Assemblies

Abstract

An approach is developed to analyze the multiharmonic forced response of large-scale finite element models of bladed disks taking account of the nonlinear forces acting at the contact interfaces of blade roots. Area contact interaction is modeled by area friction contact elements which allow for friction stresses under variable normal load, unilateral contacts, clearances, and interferences. Examples of application of the new approach to the analysis of root damping and forced response levels are given and numerical investigations of effects of contact conditions at root joints and excitation levels are explored for practical bladed disks.

The influence of joints on friction induced vibration in brake squeal

“…The scalability of approaches using the HB method with or without reduction techniques (e.g. component mode synthesis [37]) is discussed and shown in [31,38,39,40]. Besides the scalability of the HB method, these works show the method's ability to handle few, but arbitrary nonlinearities for large FE-models.…”

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].…”

Dynamics of dry friction damping in gas turbines: literature survey

“…In the context of turbine engines, Griffin (1980), Sinha and Griffin (1984), Petrov and Ewins (2006) and Cigeroglu et al (2009) have applied the HB method and its extensions to the study of the forced response of gas turbine blades and discs. Griffin (1980) and Sinha and Griffin (1984) have comprehensively analyzed the dynamics of flutters and friction dampers in mistuned bladed disc assemblies.…”

“…Several methods based on Coulomb modeling were developed to analyze frictional structures such as bladed disc assemblies by Petrov (2005), Charleux et al (2006), Cigaroglu et al (2009), Zucca (2011), Csaba (1998); tip shrouds by Yang and Menq (1998), Petrov and Ewins (2003), Menq et al (1991), Wagner and Griffin (1990); bladed disc with wedge dampers by Sanliturk and Ewins (1996), Petrov (2007), Petrov and Ewins (2006), Panning et al (2003), Hohl et al (2008); mechanical joints by Ewins (2006), Ferri (1995), Wentzel (2006), Putignano et al (2011); and torsional structures such as rotor shafts and clutches by Duan and Singh (2005).…”