Management of the variability of vibration response levels in mistuned bladed discs using robust design concepts. Part 1

Chan, Yum Ji; Ewins, D. J.

doi:10.1016/j.ymssp.2010.06.006

Cited by 23 publications

(11 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is so because of mistuning that vibrational levels may be more than 5 times higher than the counterpart in a tuned bladed disc. The amplitude factor term was introduced in previous research to measure the severity of the consequences of the mistuning response levels, being defined as the ratio of the highest forced vibration response level found in a given mistuned bladed disc to the highest forced vibration response level of the tuned counterpart under the same excitation pattern [33]. Another design factor related to mistuning is the adjusted amplitude factor proposed by Lim [34], which is expressed as the ratio between the peak response level of any given blade on a mistuned bladed disc to the peak forced level of a cantilevered blade with the same properties and type of excitations.…”

Section: Origins Of Mistuning and Consequencesmentioning

confidence: 99%

“…Another design factor related to mistuning is the adjusted amplitude factor proposed by Lim [34], which is expressed as the ratio between the peak response level of any given blade on a mistuned bladed disc to the peak forced level of a cantilevered blade with the same properties and type of excitations. This factor is mainly used in robust design since it is independent of the disc configuration [33].…”

Section: Origins Of Mistuning and Consequencesmentioning

confidence: 99%

See 1 more Smart Citation

Efficient computational techniques for mistuning analysis of bladed discs: A review

Yuan

Scarpa

Allegri

et al. 2017

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

This paper describes a review of the relevant literature about mistuning problems in bladed disc systems, and their implications for the uncertainty propagation associated to the dynamics of aeroengine systems. An emphasis of the review is placed on the developments of the multi-scale computational techniques to increase the computational efficiency for the linear mistuning analysis, especially with the respect to the reduced order modeling techniques and uncertainty quantification methods. The non-linearity phenomenon would not be considered in this paper. The first two parts describe the fundamentals of the mechanics of tuned and mistuned bladed discs, followed by a review of critical research efforts performed on the development of reduced order rotor models. The focus of the fourth part is on the review of efficient simulation methods for the stochastic analysis of mistuned bladed disc systems. After that, we will finally provide a view of the current state of the art associated to efficient inversion methods for the stochastic analysis, followed by a summary.

show abstract

Section: Origins Of Mistuning and Consequencesmentioning

confidence: 99%

Section: Origins Of Mistuning and Consequencesmentioning

confidence: 99%

Efficient computational techniques for mistuning analysis of bladed discs: A review

Yuan

Scarpa

Allegri

et al. 2017

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

show abstract

“…where V on,l is the eigenmode of the perfect rotor given in (16) and δV n,l is an unknown perturbation. Moreover the relevant eigenfrequency ω n,l is given by…”

Section: Linearized Homogenized Model For An Imperfect Rotormentioning

confidence: 99%

“…Accordingly, by substituting first ψ = g 1 and then ψ = g 2 in (21), together with the expression of V on,l and ω on,l given by (16) and (18), respectively, two independent equations in the unknowns δω n,l and ϕ n,l are obtained, whose solutions supply the two couples of frequency split and phase orientation (δω n,l , ϕ n,l ) relevant to the perturbed mode (n, l). Once the values of δω n,l and ϕ n,l have been computed, the corresponding modal shapes can be obtained by making use of the linear weak formulation (21).…”

Section: Eigenfrequencies and Eigenmodes Evaluation For An Imperfect mentioning

confidence: 99%

“…Both lumpedparameter models and finite element analysis were employed in [16] to investigate the dependence of the localization phenomenon from the internal damping and interblade coupling in bladed disks. Finite element analysis applied to the study of disordered bladed rotors with a large number of blades is quite accurate but may require a significant 2 International Journal of Rotating Machinery amount of computational effort.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Continuous Model for the Dynamical Analysis of Mistuned Bladed Rotors

Bisegna

Caruso

2012

International Journal of Rotating Machinery

View full text Add to dashboard Cite

Ideal bladed rotors are rotationally symmetric, as a consequence they exhibit couples of degenerate eigenmodes at coinciding frequencies. When even small imperfections are present destroying the periodicity of the structure (disorder or mistuning), each couple of degenerate eigenfrequencies splits into two distinct values (frequency split) and the corresponding modal shapes exhibit vibration amplitude peaks concentrated around few blades (localization phenomenon). In this paper a continuous model describing the in-plane vibrations of a mistuned bladed rotor is derived via the homogenization theory. Imperfections are accounted for as deviations of the mass and/or stiffness of some blades from the design value; a perturbation approach is adopted in order to investigate the frequency split and localization phenomena arising in the imperfect structure. Numerical simulations show the effectiveness of the proposed model, requiring much lower computational effort than classical finite element schemes.

show abstract