Reduction of Resonant Stress of Turbine Blade by Use of Asymmetric Vane Spacing (Effect of Multi-resonance on Reduction of Vibratory Stress)

Kaneko, Yasutomo; Mori, Kazuko; Tomii, Masayuki; Ohyama, Hiroharu

doi:10.1299/kikaic.72.2366

Cited by 4 publications

(3 citation statements)

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“…They also carried out the verification test on the response reduction effect for compressor and turbine blades, and confirmed the validity of the proposed method (3) (4) . In addition, they proposed an analysis method for the response of a mistuned bladed disk passing through the asymmetric vane spacing.…”

Section: Journal Of System Design and Dynamicsmentioning

confidence: 60%

Study on Vibration Characteristics of Mistuned Bladed Disk(Vibration Response Analysis by Reduced Model FMM)

Kaneko

Nakanishi

Mori

et al. 2013

JSDD

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It is well known that the asymmetric vane spacing can result in decreased levels of the excitation at specific frequencies. In the previous paper, the resonant response reduction of the mistuned bladed disks due to the asymmetric vane spacing was studied by use of the equivalent spring-mass model. Although the mistuned bladed disk should be analyzed by FEA (Finite Element Analysis) to accurately evaluate the resonant response reduction effect of the asymmetric vane spacing, it is unrealistic due to enormous computational time. Therefore, in this study, the mistuned bladed disk is modeled by use of FMM (Fundamental Mistuning Model) to evaluate the resonant response reduction effect of the asymmetric vane spacing accurately and practically. First, the frequency response analysis of a simple mistuned bladed disk consisting of flat plate blades is carried out for the symmetric and asymmetric vane spacing, using both of FMM and the direct FEA, and the calculated results are compared to confirm the validity of FMM. Second, the frequency response analysis of a realistic bladed disk is carried out for the symmetric and asymmetric vane spacing, using FMM, to examine the effect of the resonant response reduction effect.

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Section: Journal Of System Design and Dynamicsmentioning

confidence: 60%

Study on Vibration Characteristics of Mistuned Bladed Disk(Vibration Response Analysis by Reduced Model FMM)

Kaneko

Nakanishi

Mori

et al. 2013

JSDD

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“…As for a tuned bladed disk, where dynamic properties of individual blades on a disk is the same, the reduction effect of the resonant stress due to asymmetric vane spacing has been studied theoretically and experimentally [3,4]. However, realistic bladed disks, although designed mostly to be cyclically symmetric, are mistuned, i.e.…”

Section: Intrductionmentioning

confidence: 99%

Study on Vibration Response Reduction of Bladed Disk by Use of Asymmetric Vane Spacing (Study on Response Reduction of Mistuned Bladed Disk)

Kaneko

Ohta

Mori

et al. 2012

JGPP

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It is well known that asymmetric vane spacing can result in decreased levels of the excitation at specific frequencies. In this paper, the resonant response reduction of mistuned bladed disks due to asymmetric vane spacing is studied theoretically for the most probable asymmetric vane, in which the vane count of the upper and lower half is slightly different. First, a method for predicting the maximum amplitude of the mistuned bladed disk for the asymmetric vane spacing is proposed. Second, a parametric study is carried out using Monte Carlo simulation to clarify the vibration response characteristics of the mistuned bladed disk for the asymmetric vane spacing. From these results, it is concluded that asymmetric vane spacing is effective for reduction of resonant amplitudes of a mistuned bladed disk if a multi-resonance phenomenon does not appear. Blade-Vane Interaction Force for Asymmetric Vane Spacing When the vane counts in the upper and lower half are N 1 and N 2 , respectively, two kinds of blade-vane interaction analyses with 3D

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“…The rotary shaft system is usually designed to give a low Q-factor and avoid resonance based on the rotor-dynamic analysis of the bending and torsional vibration of the shaft-bearing system, in which the blades are assumed to be a rigid disk. Meanwhile, the blade is designed to avoid resonance under the rated operation conditions based on analysis of a single blade under ideal conditions where the shaft is assumed to be fixed [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Resonance and Instability of Blade-Shaft Coupled Bending Vibrations with In-plane Blade Vibration

Anegawa

Fujiwara

Okabe

et al. 2008

International Journal of Fluid Machinery and Systems

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As a major component of a power plant, a turbine generator must have sufficient reliability. Longer blades have lower natural frequency, thereby requiring that the design of the shaft and blade takes into account the coupling of the blade vibration mode, nodal diameter k=0 and k=1 with vibration of the shaft.The present work analyzes the coupling of the translation motion of the shaft with in-plane vibration of the blades with k=1 modes. At a rotational speed Ω 1 =|ω s −ω b |, the resonance of the blades has a relatively large amplitude. A violent coupled resonance was observed at a rotational speed Ω 2 =ω s +ω b . Resonance in blade vibration at Ω 1 =|ω s −ω b | was experimentally confirmed.

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Reduction of Resonant Stress of Turbine Blade by Use of Asymmetric Vane Spacing (Effect of Multi-resonance on Reduction of Vibratory Stress)

Cited by 4 publications

References 0 publications

Study on Vibration Characteristics of Mistuned Bladed Disk(Vibration Response Analysis by Reduced Model FMM)

Study on Vibration Characteristics of Mistuned Bladed Disk(Vibration Response Analysis by Reduced Model FMM)

Study on Vibration Response Reduction of Bladed Disk by Use of Asymmetric Vane Spacing (Study on Response Reduction of Mistuned Bladed Disk)

Resonance and Instability of Blade-Shaft Coupled Bending Vibrations with In-plane Blade Vibration

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