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

Anegawa, Norihisa; Fujiwara, Hiroyuki; Okabe, Atsuyuki; Matsushita, Osami

doi:10.5293/ijfms.2008.1.1.169

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…Many modes of other subsystems are speed-independent such as rotor whirl modes. 31–33 Particularly in wind turbine applications, the aerodynamic force of the wind turbulence on the blades or turbulent velocity have been characterized by Gaussian probability density functions, such as the Kaimal, von Karman, and Mann models, as recommended in the previous IEC guidelines. 34,35 Currently, stochastic wind turbine analyses are mostly based on these idealized turbulence input models that assume a Gaussian distribution for atmospheric turbulence and a normal distribution for the magnitude of velocity.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Condition monitoring and vibration analysis of wind turbine

Xiao

Tian

Wait

et al. 2020

Advances in Mechanical Engineering

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Health condition monitoring through comprehensive monitoring, incipient fault diagnosis, and the prediction of impending faults allows for the promotion of the long-term performance of wind turbines, particularly those in harsh environments such as cold regions. The condition monitoring of wind turbines is characterized by the difficulties associated with the lack of measured data and the nonstationary, stochastic, and complicated nature of vibration responses. This article presents a characterization of the vibrations of an operational wind turbine by spectrogram, scalogram, and bi-spectrum analyses. The results reveal varied nonstationary stochastic properties and mode-coupling instability in the vibrations of the tested wind turbine tower. The analysis illustrates that the wind turbine system vibrations exhibit certain non-Gaussian stochastic properties. An analytical model is used to evaluate the nonstationary, stochastic phenomena and mode-coupling phenomena observed in the experimental results. These results are of significance for the fault diagnosis of wind turbine system in operation as well as for improving fatigue designs beyond the wind turbulence spectral models recommended in the standards.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Condition monitoring and vibration analysis of wind turbine

Xiao

Tian

Wait

et al. 2020

Advances in Mechanical Engineering

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“…And the shaft-blades model is considered, considering the coupling vibration among shaft bending and blade bending. Anegawa et al [5] successfully analyzed the coupling of the shaft with in-plane vibration of the blades with = 1 modes in a 1-DOF mass-spring system. What is more, the existence of an unstable region due to coupling and the characteristics of coupled resonance were indicated which 2 Mathematical Problems in Engineering was confirmed by experimental data.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Shaft’s Bending on the Coupling Vibration of a Flexible Blade‐Rotor System

She

Wen

et al. 2017

Mathematical Problems in Engineering

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The influence of shaft bending on the coupling vibration of rotor-blades system is nonignorable. Therefore, this paper analyzed the influence of shaft bending on the coupling vibration of rotor-blades system. The vibration mode function of shaft under elastic supporting condition was also derived to ensure accuracy of the model as well. The influence of the number of blades, the position of disk, and the support stiffness of shaft on critical speed of system was analyzed. The numerical results show that there were two categories of coupling mode shapes which belong to a set where the blade’s first two modes predominate in the system: shaft-blade (SB) mode and interblade (BB) mode due to the coupling between blade and shaft. The BB mode was of repeated frequencies of (Nb-2) multiplicity for number blades, and the SB mode was of repeated frequencies of (2) multiplicity for number blades. What is more, with the increase of the number of blades, natural frequency of rotor was decreasing linearly, that of BB mode was constant, and that of SB mode was increasing linearly. Natural frequency of BB mode was not affected while that of rotor and SB mode was affected (changed symmetrically with the center of shaft) by the position of disk. In the end, vibration characteristics of coupling mode shapes were analyzed.

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