Coupling Vibrations in Rotating Shaft-Disk-Blades System

Yang, Cheng-Hsiung; Huang, Shyh‐Chin

doi:10.1115/1.2221328

Cited by 31 publications

(21 citation statements)

References 25 publications

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“…Chiu and Chen 3 and Chiu and Yang 4 presented the coupled vibration responses of rotating rotor system with different disks by means of numerical simulations. Yang and Huang 5,6 investigated the free vibration of coupling components including shaft-torsional, disk transverse and blade bending by utilizing an energy method. Jeon et al 7 developed the rotordynamic model of fuel turbopump and performed the dynamic analysis to predict rotating natural frequencies, critical speeds and system instability.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing

Wang

Jiang

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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The dual-rotor structure is susceptible to vibration, causing the malfunction of the entire operating system. In order to avoid the resonance during operation, it is significant and necessary to conduct modal analysis of such rotors. The dynamic analysis of the full dual-rotor system under operating conditions is also necessary to study dynamic characteristics of the rotating system. In this paper, one-dimension Timoshenko beam-type model, including the effects of gyroscopic moments, rotary inertias, bending and shear deformations, and three-dimension model for dual-rotor system with inter-shaft bearing are developed. Critical speed tests of dual-rotor are carried out to verify the analytical results. Based on the finite element models, the first critical speed excited by inner rotor and the first two critical speeds excited by outer rotor are calculated. The comparisons between both finite element models indicate that 1D model costs less time, which can be used to predict the critical speeds. Good agreement between the theoretical and experimental results shows the accuracy of the FE models. The Campbell diagram, critical speeds, operational deflection shapes and unbalance response of the dual-rotor are obtained to fully study the dynamic characteristics of the dual-rotor system.

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Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing

Wang

Jiang

2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…It can overcome the difficulty of obtaining the collision force in the contact process in the transient impact model and the difficulty of selecting parameters in the continuous contact collision force model. 32 Also, this method can simulate the collision process more accurate than the instantaneous impact model and continuous contact force model. 33 Base on previous studies, the first aim of this study is to use the finite element method to analyse the vibration response of the integral shroud blades for high-pressure steam turbine.…”

Section: Introductionmentioning

confidence: 99%

Study on the collision dynamics of integral shroud blade for high-pressure turbine in different integral shroud clearance distance

Zhang

Wang

Qin

et al. 2021

Noise & Vibration Worldwide

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In steam turbine, turbine blades are prone to vibrate during operation, resulting in steam turbine accidents. The most common method for reducing the vibration of steam turbine blades is to design an integral shroud for blade which is termed as integral shroud blade. Most previous studies simplified straight integral blades into cantilever beam and used harmonic response analysis method to simulate the vibration response of blades. This method is suitable for simulating straight blade vibration under harmonic force conditions. For twisted blades, accurate results are hard to acquire and the specific collision process cannot be simulated. In order to observe the collision process on a microscopic scale and explore its collision damping mechanism, this study evaluated the collision process of twisted blades with different integral shroud clearance distance based on LS-DYNA software. The collision process for a two-blade system and a three-blade system with integral shroud clearance distance from 0.1 mm to 0.5 mm has been simulated. The results indicated that integral shroud clearance distance have opposite vibration damping effect when the blade under the condition of forced vibration and free vibration. For the two-blade system, the optimal integral shroud clearance distance is 0.4 mm for forced vibration condition and 0.1 mm for free vibration condition. For the three-blade system, the optimal integral shroud clearance distance is 0.1 mm for forced vibration condition and 0.5 mm for free vibration condition.

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“…Yang and Huang [16] studied the longitudinal motion effects on the coupled vibration in a shaft-disk-blades system. Yang and Huang [17][18][19] investigated the coupling vibrations and applications among support-longitudinal, shaft-torsion, disktransverse, and blade-bending vibrations in a shaft-diskblades unit. Chiu and Huang [20] investigated the influence on coupling vibrations among shaft torsion, disk-transverse, and blade bending of a rotor system with a mistuned blade length analytically and found that the shaft-disk-blades system appeared to have four types of coupling vibrations: shaft-blade (SB), shaft-disk-blade (SDB), disk-blade (DB), and blade-blade (BB) mode.…”

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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Coupling Vibrations in Rotating Shaft-Disk-Blades System

Cited by 31 publications

References 25 publications

Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing

Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing

Study on the collision dynamics of integral shroud blade for high-pressure turbine in different integral shroud clearance distance

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

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