Mistuning Parameters Identification of a Bladed Disk

Pichot, François; Thouverez, Fabrice; Jézéquel, L.; Seinturier, Eric

doi:10.4028/www.scientific.net/kem.204-205.123

Cited by 11 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mistuning identification technique used for this study was presented by Pichot et al [15,18,23]. This method aims at updating the previous mistuned reduced-order model of bladed disk.…”

Section: Mistuning Identification Techniquementioning

confidence: 99%

“…Feiner and Griffin [13,14] have proposed a method of identification for a whole sector of a bladed disk based on a reduced-order modelling method called fundamental mistuning model, they also proposed a completely experimental strategy. Another method, proposed by Pichot et al [15] and used is this study, is also based on a component mode synthesis and uses an original technique of eigenvalue assignment [16,17] combined with a regularization technique which minimizes the effect of measurement errors. This method was numerically validated in [18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mistuning Identification and Model Updating of an Industrial Blisk

Laxalde

Thouverez

Sinou

et al. 2007

International Journal of Rotating Machinery

Self Cite

View full text Add to dashboard Cite

The results of a complete study of mistuning identification on an industrial blisk are presented. The identification method used here is based on a model-updating technique of a reduced order. This reduced-order model is built using component mode synthesis, and mistuning is introduced as perturbations of the cantilevered-blade modes. The measured modal data are extracted from global measurements of the blisk's forced response. As we use a single point excitation, this measurement procedure allows the acquisition of all the modes of a given family with a quite simple experimental setup. A selection of the best identified modal data is finally performed. During the mistuning identification procedure, these measured data are regularized using an eigenvector assignment technique which reduces the influence of eventual measurement errors. An inverse problem, based on the perturbed (mistuned) modal equation, is defined with measured modes as input and mistuning parameters as unknown. Then, the reduced-order model is updated with the identified mistuning, we first perform a correlation on modal responses (using eigenfrequency deviation criteria and MACs). Finally, correlation results on forced responses are presented and discussed.

show abstract

“…The mistuning identification technique used for this study was presented by Pichot et al [15,18,23]. This method aims at updating the previous mistuned reduced-order model of bladed disk.…”

Section: Mistuning Identification Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mistuning Identification and Model Updating of an Industrial Blisk

Laxalde

Thouverez

Sinou

et al. 2007

International Journal of Rotating Machinery

Self Cite

View full text Add to dashboard Cite

show abstract

“…Mistuning identification results can also be used for evaluating manufacturing processes and identifying wear and damage during maintenance checks. Work in this area has ranged from simple lumped parameter models 9,10 to more involved reduced-order modeling techniques. [11][12][13][14][15][16][17][18][19][20][21] Judge et al 11 found that the identified mistuning parameters were sensitive to errors in the finite element model (FEM) or measurement data.…”

Section: Introductionmentioning

confidence: 99%

Reduced-Order Model Construction Procedure for Robust Mistuning Identification of Blisks

2008

View full text Add to dashboard Cite

The reduced-order modeling of integrally bladed disks (blisks) for predicting the mistuned vibration response has been well studied and understood. For solving a direct vibration problem, adding modes to the modeling basis improves the accuracy of the reducedorder model (ROM) with respect to the parent finite element model. In contrast, when solving an inverse problem for system identification, adding modes to the ROM while using the same measurements may actually reduce its accuracy. This is especially true for solving inverse problems related to identification of blade mistuning parameters, because the characteristics of the selected system modes for the ROM may not match well the assumptions used in the mistuning modeling approach. In this work, a procedure is introduced for constructing a ROM referred to as the inverse ROM (IROM) that is well suited for solving the mistuning identification inverse problem. First, a quantitative metric is defined to characterize and rank the tuned system modes with respect to their suitability for constructing IROMs. Then, the direct problem is solved using a larger direct ROM (or DROM) with prescribed mistuning in order to interrogate and validate the performance of various IROMs as modes are added. This enables the automated construction of suitable IROMs and improves the overall accuracy and robustness of mistuning identification.

show abstract

“…In bladed disk assemblies, mistuning identification can be achieved through individual tests on each blade, and the mistuning is defined as the deviations of the blade's natural frequencies with respect to their nominal value (ie tuned). However, in singlepiece structures such blisks (integrally bladed disks) or blings, individual measurements are no longer possible and mistuning identification using measurements of the system modes and natural frequencies is essential [16][17][18]22]. In recent years, several methods have been developed to identify mistuning [23][24][25].…”

Section: Introductionmentioning

confidence: 99%