A novel method for predicting the response variability of friction-damped gas turbine blades

Butlin, Tore; Ghaderi, Pedram; Spelman, G; Midgley, Will; Umehara, Ryuichi

doi:10.1016/j.jsv.2018.10.013

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…Krack et al [13] performed a reliability analysis of a cyclic blisk with nonlinear shroud coupling subjected to the uncertainties in contact interfaces, showing again a large impact of the contact parameters. Butlin et al [28,29] developed an approach based on the Maximum Entropy to estimate the response distribution for a structure with friction, which was validated against experimental data by a test rig that represents friction damper assemblies. Delaune et al [30] numerically investigated the impact of uncertainties on fretting wear and showed that a large variety of vibration behaviours can be observed when uncertainty is considered.…”

Section: Introductionmentioning

confidence: 99%

Propagation of friction parameter uncertainties in the nonlinear dynamic response of turbine blades with underplatform dampers

Yuan

Fantetti

Denimal

et al. 2021

Mechanical Systems and Signal Processing

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Underplatform dampers are widely used in turbomachinery to mitigate structural vibrations by means of friction dissipation at the interfaces. The modelling of such friction dissipation is challenging because of the high variability observed in experimental measurements of contact parameters. Although this variability is not commonly accounted for in state-of-the-art numerical solvers, probabilistic approaches can be implemented to include it in dynamics simulations in order to significantly improve the estimation of the damper performance. The aim of this work is to obtain uncertainty bands in the dynamic response of turbine blades equipped with dampers by including the variability observed in interfacial contact parameters. This variability is experimentally quantified from a friction rig and used to generate uncertainty bands by combining a deterministic state-of-the-art numerical solver with stochastic Polynomial Chaos Expansion (PCE) models. The bands thus obtained are validated against experimental data from an underplatform damper test rig. In addition, the PCEs are also employed to perform a variance-based global sensitivity analysis to quantify the influence of contact parameters on the variation in the nonlinear dynamic response via Sobol indices. The analysis highlights that the influence of each contact parameter in vibration amplitude strongly varies over the frequency range, and that Sobol indices can be effectively used to analyse uncertainties associated to structures with friction interfaces providing valuable insights into the physics of such complex nonlinear systems.

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Section: Introductionmentioning

confidence: 99%

Propagation of friction parameter uncertainties in the nonlinear dynamic response of turbine blades with underplatform dampers

Yuan

Fantetti

Denimal

et al. 2021

Mechanical Systems and Signal Processing

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“…The dynamical characteristics of turbine bladed disk with dampers have been well studied through a large amount of numerical and experimental investigations though the behavior of dry friction is nonlinear. [1][2][3][4][5][6][7] Blade mistuning is one of the problems that hardly averted in industrial production processes of realistic turbine blades, such as blade manufacturing, installation tolerances, and wear, etc. [8][9][10] Indeed, the vibration amplitude and stress level of blades are highly sensitive to mistuning, especially in frequency steering regions.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration analysis of mistuned damped blades with nonlinear friction and contact

Zhao

Zhang

Xie

2019

Journal of Low Frequency Noise, Vibration and Active Control

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In general, only in tangential direction, friction motion between blade dampers is concerned for vibration analysis of mistuned bladed disk. However, in practical, excitation acting on blades inevitably causes normal movement at friction interface due to the existence of angle between excitation force and contact surface. This fact leads to a variation of normal force or even a result of contact separation, which determine the maximum static friction for tangential frictional vibration. In order to assess the realistic nonlinear forced vibration of mistuned disk assemblies subjected to actual excitation with nonlinear friction and contact, an efficient method is developed by using large-scale finite element model and two-dimensional friction model. In the proposed paper, attentions are paid on the realistic coupled vibration and the impact of variable normal vibration on forced response to a traveling wave excitation. Three types of mistuned parameters, including tangential stiffness of friction surface, initial shroud gap (corresponding to preload normal force), and structural stiffness of blades are taken into account for analyzing the effect of mistuning on the coupling vibration, especially for cases of contact separation. Furthermore, by means of curve fitting of amplitude variation of normal forces, the dependence of friction motion of bladed disk studied at circumferential resonance on variation of axial displacement, even with contact separation involved, is addressed. The results show a complex nonlinear vibration with friction and contact, especially a complex multiple unstable vibration observed with repeated nonlinear snap at circumferential resonance for the cases of contact separation. With regard to a small initial normal force, a large amplitude value of force variation can greatly reduce the maximum response amplitude for mistuned blades, which is worth to pay attentions for the vibration analysis of bladed disk with nonlinear friction and contact.

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Numerical Simulation and Experimental Verification on the Effects of Vibration Suppression of HPT Blades

Wu,

Liu,

Wang

et al. 2024

2023 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2023) Proceedings

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A novel method for predicting the response variability of friction-damped gas turbine blades

Cited by 9 publications

References 23 publications

Propagation of friction parameter uncertainties in the nonlinear dynamic response of turbine blades with underplatform dampers

Propagation of friction parameter uncertainties in the nonlinear dynamic response of turbine blades with underplatform dampers

Vibration analysis of mistuned damped blades with nonlinear friction and contact

Numerical Simulation and Experimental Verification on the Effects of Vibration Suppression of HPT Blades

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