Mistuning identification for industrial blisks based on the best achievable eigenvector

Pichot, François; Laxalde, Denis; Sinou, Jean-Jacques; Thouverez, Fabrice; Lombard, Jean-Pierre

doi:10.1016/j.compstruc.2006.08.022

Cited by 31 publications

(16 citation statements)

References 31 publications

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“…Hence, the use of ROMs becomes essential. Mistuned ROMs may also be useful in other scenarios where repeated simulations of blisks are necessary, such as mistuning identification from blisk response measurements [27,[113][114][115][116], optimizing intentional mistuning patterns in blades [3,14,109], deciding mistuned damper arrangements [117,118], or detecting abnormalities in the structure such as cracks [119,120].…”

Section: Mistuning and Its Consequencesmentioning

confidence: 99%

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Mitra

Epureanu

2019

Applied Mechanics Reviews

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Turbine bladed disks or blisks, which constitute critical components of most modern turbomachinery, are known for their complex vibratory behavior. The nonlinear dynamics observed in most operational regimes of blisk with contact interfaces are dominated by one of two typical contact behaviors. Frictional contacts are dominated by Coulomb friction forces, while intermittent contacts are characterized by multiple separation events. Other factors such as the dispersion in material or geometric properties across blades, known as mistuning, also affect the dynamics significantly. Presently, probabilistic analysis is the widely accepted design methodology to account for mistuning, which is unknown prior to manufacture. Thus, reduced order modeling of these blisks is essential as high fidelity models are prohibitively expensive for such simulations. This paper provides a technical discussion of dynamic modeling and reviews projection-based techniques used for creation of reduced models of blisks with contacts.

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Section: Mistuning and Its Consequencesmentioning

confidence: 99%

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Mitra

Epureanu

2019

Applied Mechanics Reviews

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“…Mignolet [3] in order to accurately predict the statistical characteristics of the forced response of mistuned bladed disks, three different methods are proposed to solve the problem of insufficient data, and the three methods are validated on the lumped parameter model. Pichot [4] presented a method for identifying the mistuning of blade disk based on the system mode and the measurement of natural frequency. This method establishes the finite element model of blade disk, and presents a computational reduced-order modelling technology based on component-mode substitution method.…”

Section: Introductionmentioning

confidence: 99%

Forced response characteristics of random mistuned blade disk based on weibull distribution and monte carlo simulation

Zhang¹,

Yuan²,

Sun³

2019

J. vibroeng.

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This paper presents a method of mistuning identification of a random mistuned bladed parameter, to predict the forced vibration characteristics of random mistuned blade disk of aeroengine compressor, based on the prestress mode synthesis method, substructure finite element reduction model was adopted, the identification method combines Weibull distribution with Monte Carlo simulation to identify the random mistuned blade parameters. The vibration characteristics of mistuned bladed disks under different engine orders of excitation were calculated, and the vibration characteristics of mistuned bladed disk systems under different mistuning standard deviations were discussed. Vibration localization characteristics of mistuned bladed disk system were analysed by using localization factor. The correctness of the identification method was verified by calculating the vibration amplitude of mistuned bladed disk system under different mistuning standard deviations.

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“…Early works were based on lumped parameter models in order to identify the structural parameters of blades [18,19]. More recently, identification methods based on ROMs have been developed [20,21,16,17,22,23,24,25].…”

Section: Introductionmentioning

confidence: 99%

Identification of mistuning and model updating of an academic blisk based on geometry and vibration measurements

Nyssen

Golinval

2016

Mechanical Systems and Signal Processing

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In this work, an experimental modal analysis is performed on an academic bladed disk using a base excitation to identify the mistuning of each blade. Optical measurement is used to obtain the exact geometry of the structure and to be able to associate geometrical mistuning to each blade. Differences are observed between the experimentally identified mistuning and the geometrical mistuning. Since the bladed disk is a onepiece structure, there is no welded connections between the blades and the disk and the material properties can be assumed to be uniform. It can be shown that these differences come from non uniform clamping conditions, and that this mistuning is of the same order of magnitude than the variations in the geometry of the structure. It follows that the precise characterisation of mistuning for industrial structures is in practice illusory because of the numerous factors introducing mistuning, such as the clamping conditions, aerodynamic damping, wear in service, etc.

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Mistuning identification for industrial blisks based on the best achievable eigenvector

Cited by 31 publications

References 31 publications

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Forced response characteristics of random mistuned blade disk based on weibull distribution and monte carlo simulation

Identification of mistuning and model updating of an academic blisk based on geometry and vibration measurements

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