Rotating vibration behavior of the turbine blades with different groups of blades

Tsai, Gwo-Chung

doi:10.1016/s0022-460x(03)00280-3

Cited by 42 publications

(6 citation statements)

References 23 publications

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“…Where F res is the experimental resonant frequency (EMA outcome) and F nf is the numerical calculated natural frequency (FEMA outcome) By comparing the FEMA result and EMA result of the healthy blade, it is seen that the variation of frequencies in the result is less than 3% which shows the FE-based computational analysis for LP steam turbine blade is fairly accurate, suitable, and quite encouraging for further parametric analysis 51 (5% difference between FEM and experimental data) 26 (3% between FEM and experimental data 2018) as shown in Figure 7.…”

Section: Validation Of Fe Modal Analysis (Fema) With Experimental Mod...mentioning

confidence: 99%

Vibration Response of Steam Turbine Healthy and Cracked Blade under the Stress Stiffening and Spin Softening Effects

Bhamu

Shukla

Sharma

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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In the present paper, vibration responses of the healthy and cracked blade under the influence of stress-stiffening and spin-softening have been studied. The three-dimensional finite element-based numerical analysis is carried out to study the blade's mode shape and natural frequencies and are validated with the experimental modal analysis test results. In the case of spin softening, for healthy blade at the turbine’s speed over 1000 RPM, natural frequencies increase significantly in both first flap-wise and chordwise bending modes. In both cases of STF and SOF, for the cracked blade, the deviation from the healthy blade in the natural frequency increases with increasing crack size, maximal in a crack size of 90%. It is also observed that irrespective of crack size, deviation in natural frequencies as compared to healthy blade increases as spin speed increases in the cases of chordwise bending mode (Mode II) and higher-order overlapped mode IV, and in the case of fundamental torsion mode (Mode III), higher-order overlapped mode V and VI natural frequencies decrease in both STF and SOF cases.

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Section: Validation Of Fe Modal Analysis (Fema) With Experimental Mod...mentioning

confidence: 99%

Vibration Response of Steam Turbine Healthy and Cracked Blade under the Stress Stiffening and Spin Softening Effects

Bhamu

Shukla

Sharma

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…3 A modeling method is used to analyze the bladed disk with shroud. 4 Their results indicated that the modal characteristics are significantly affected by the shroud. In order to increase computational efficiency, reduced-order model is developed to investigate the transient dynamic behaviors of 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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“…Chung and Yoo [2] used the finite element method and the discretized equations to investigate the behaviors of the natural frequencies with the variation of the rotating speed. Tsai [3] used the FEM to explore the dynamic characteristics of a single blade, 6-blade groups, and 12-blade groups and found that the vibration frequency and mode shape of single blade are in good agreement with that of the whole blade. Yan et al [4] used the experimental mode analysis and mode correction methods to investigate the coupling vibration of the mistuned bladedisk in aeroengine and found the right working frequency range of aeroengine.…”

Section: Introductionmentioning

confidence: 99%

Study on the Nonlinear Characteristics of a Rotating Flexible Blade with Dovetail Interface Feature

Shen

Zhong

et al. 2018

Shock and Vibration

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A dynamic model is proposed in this paper for analyzing the nonlinear characteristics of a flexible blade. The dynamical equation of motion for a rotational flexible blade in a centrifugal force field is established based on the finite element method. A macro-stickslip mechanical model of dry friction is established to simulate the constraint condition of the flexible blade. The combined motion of the external excitation and friction produces a piecewise linear vibration which is actually nonlinear. The numerical integration method is employed to calculate the vibration reduction characteristics of the nonlinear constrained rotating blade. The results show that the nonlinear dry friction force produced by the dovetail interface plays an important role in vibration reduction. And the effect of dry friction vibration reduction is significant when the rotating speed is slow or the friction coefficient is small. Besides, the magnitude of external excitation also has a great impact on the state of the friction. Therefore, some relevant experimental researches should be done in the future.

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Rotating vibration behavior of the turbine blades with different groups of blades

Cited by 42 publications

References 23 publications

Vibration Response of Steam Turbine Healthy and Cracked Blade under the Stress Stiffening and Spin Softening Effects

Vibration Response of Steam Turbine Healthy and Cracked Blade under the Stress Stiffening and Spin Softening Effects

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

Study on the Nonlinear Characteristics of a Rotating Flexible Blade with Dovetail Interface Feature

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