Dynamic Response of Packets of Blades by The Finite Element Method

Salama, Abdallah; Petyt, M.

doi:10.1115/1.3453989

Cited by 7 publications

(3 citation statements)

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“…Dynamic behaviors of bladed packets are studied. 1,2 In order to investigate the different number of groups on the dynamic behaviors of bladed disk, finite modeling is used to study the difference in dynamic behaviors of two structures with different groups of bladed packets. 3 A modeling method is used to analyze the bladed disk with shroud.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of vibration localization of mistuned bladed disk due to shroud and blade damages

Kan,

Wang,

Zhao

2023

Journal of Low Frequency Noise, Vibration and Active Control

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Dynamic behaviors of turbine blades are important for the dynamic design of whole-bladed disk systems. The bladed disk systems with shrouds are used to achieve advanced functions in operation. The shrouds are used to connect several blades as a bladed packet, and several bladed packets are assembled as a bladed disk. Previous researches mainly focus on the mistuning of the bladed disk. However, in operation, the shrouds often suffer damage and wear, and it will lead to shrouds mistuning. The shroud is a critical component for adjusting the coupling strength of the blade to the blade. The innovation of this paper is to study the coupling dynamics problem caused by blade mistuning and shroud damage. The localized vibration of the bladed disk is caused by the blade mistuning, and the shroud damage can also cause the localized vibration of the bladed disk. The coupling dynamic behaviors of bladed disk caused by blade mistuning and shroud damage are important. Therefore, the dynamic behaviors of a mistuned bladed disk with the shroud are important for the bladed disk. A numerical method is conducted to investigate the dynamic characteristics of the whole bladed disk with shroud. The coupling effect between shroud and blade mistuning on the dynamic behaviors of the bladed disk is researched. The numerical model is validated by assuming the shroud and blade mistuning is zero. The coupling effect of shroud and blade mistuning leads to the characteristics being more complicated. Bladed packet is the basic part of the bladed disk with shroud. In order to study the modal characteristics of bladed packets due to shroud, an experiment is conducted. It is worth noting that the first sub remains invariable with the increasing of stiffness ratio.

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Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of vibration localization of mistuned bladed disk due to shroud and blade damages

Kan,

Wang,

Zhao

2023

Journal of Low Frequency Noise, Vibration and Active Control

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“…Thomas and Belek [16] have also used finite element model for a group of blades with rectangular cross-section to find modal parameters in the tangential mode. Salama and Petyt [17] have used finite element model and periodical structural analysis of the tangential vibration of packeted blades; both the positions of the lacing wire and rotations were taken into account.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Investigation of Lacing Wire Damage Induced Mistuning in Turbine Blade Packet

Kotambkar

Chatterjee

2014

Advances in Acoustics and Vibration

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Investigations of modal parameters for a mistuned packet of turbine blades due to lacing wire damage are reported using analytical and numerical studies with a simplified model. The turbine blade is assumed to be an Euler-Bernoulli beam connected with a lacing wire which is modeled as a mass less linear elastic spring. Thus, the blade is considered as a continuous system and lacing wire as a discrete system. The analytical results using Eigen value analysis are compared with numerical results obtained using commercial finite element package. In real life situation, though not reported in the literature, it is the failure of lacing wire that occurs quite often compared to the turbine blade and acts as precursor to the subsequent blade damage if it goes undetected. Therefore, studying the modal parameters of the grouped turbine blades in the context of lacing wire failure becomes important. The effect of variation of lacing wire location and stiffness indicative of damage resulting in the loss of stiffness on modal parameters is investigated. The study reveals a lot of fundamental understandings pertaining to dynamic behavior of grouped blades compared to the stand-alone blade under the influence of damaged lacing wire.

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“…They also showed that the in-plane vibration characteristics of a symmetric cross section blade group could be predicted from an inference diagram for a two-blade group. Salama and Petyt (1978) did a similar study, but additionally examined the effects of various positioning arrangements for coupling wires between blades, the effects of finite radius of the disk (i.e., radially oriented blades), and the stiffening effects of rotation. This analysis constrained the geometry, and thus the mode shapes, to be symmetric.…”

Section: Introductionmentioning

confidence: 99%

Forced Harmonic Response of Grouped Blade Systems: Part II — Application

Wagner

Griffin

1994

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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The vibration of grouped blades on a flexible disk should, for purposes of economy and clarity of modal identification, be analyzed using procedures developed for cyclically-symmetric structures. In this paper, a numerical model, based on the theory of cyclically-symmetric structures, is applied to the vibration analysis, and in particular, the harmonic response, of a flexible disk supporting a number of groups, or packets, of turbine blades. Results are presented to show variations in the modal participation factors as a function of such parameters as disk flexibility, blade density, and the total number of assembled groups. It is also shown that many characteristics of the system spectra of natural frequencies are strongly dependent on the number of blade groups.

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Dynamic Response of Packets of Blades by The Finite Element Method

Cited by 7 publications

References 0 publications

Dynamic characteristics of vibration localization of mistuned bladed disk due to shroud and blade damages

Dynamic characteristics of vibration localization of mistuned bladed disk due to shroud and blade damages

Analytical and Numerical Investigation of Lacing Wire Damage Induced Mistuning in Turbine Blade Packet

Forced Harmonic Response of Grouped Blade Systems: Part II — Application

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