Lateral and Torsional Vibrations of a Two-Disk Rotor-Stator System With Axial Contact/Rubs

Zhang, Kunpeng; Ding, Qian

doi:10.1142/s1758825109000137

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…His research shows that the axial rub results in complicated behaviors, such as quasi-periodical or chaotic responses, and the rotordyanmics are similar to the radial rub impact. Kunpeng and Qian 23 numerically investigated the lateral–torsional coupling vibration of a rotor system influenced by axial contact/rubs between rotor disks and stator. The calculation shows that the lateral vibration changes from periodic to chaotic, and the torsional natural frequency appears as the occurrence of the axial rub.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Long

Han

Zhao

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

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Gas bearings are widely used in micro- and small turbomachinery. Because of the pursuit of high efficiency, turbomachinery adopts small clearance of rotor and stator. The gas bearing rotor system easily suffers from rub impact due to the inherently low damping and load capacity of gas film. Axial rub impact may lead to catastrophic failure of gas bearing rotor system. Previous work put emphasis on radial rub, and only a few papers researched on the axial rub impact by simulation method. In this paper, dynamic responses of full annular axial rub are investigated numerically and experimentally. A single span flexible rotor test rig is established to support this research. Dynamic characteristics of full annular axial rub of this gas bearing rotor system are obtained with finite element language-APDL. Dynamic characteristics within full speed range are experimentally researched based on the test rig. The dynamic behaviors are analyzed by means of waterfall diagrams, frequency spectrums, orbit trails, and vibration amplitude waveforms. During speed up, half speed whirl and gas film oscillation occur in radial direction. During speed down, the full annular axial rub between rotor thrust disk and gas bearing occurs. When lightly axial rub impact happens, the vibration patterns in the radial direction change barely, and 0 Hz component appears in the axial direction. When serious full annular axial rub impact happens, 0 Hz component occurs in both radial and axial directions and rotor orbit shows transverse motion in radial direction. These forms of dynamic characteristics can be effectively used to diagnose the full annular axial rub impact.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Long

Han

Zhao

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…e results showed that the nonuniform initial gap led to rich vibration phenomena in the dynamic responses, especially in the torsional responses. Zhang and Ding [22,23] investigated the influence of rubimpact on the bending and torsional vibrations of a two-disk rotor-stator system. e results indicated that the spectrum analyses of the torsional vibrations were more suitable to determine the axial contact-rubs.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study on the Transient Time‐Frequency Characteristics of the Bending‐Torsional Coupling Motions of a Rub‐Impact Dual‐Rotor System

Gao

Cao

Zhang

2021

Shock and Vibration

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This paper focuses on the fault characteristics of the bending and torsional motions of a rub-impact dual-rotor system caused by aircraft flight maneuvers. The equations of the bending-torsional coupling motion of a dual-rotor system are established considering a low-pressure rotor rub-impact fault and the transient barrel roll flight of an aircraft. The 4th Runge-Kutta method with varied steps is used to obtain the bending and torsional responses. Then, the influences of the system parameters, including the rub-impact stiffness, friction coefficient, and rotating speed, on the bending and torsional motions of the dual-rotor system are investigated in detail. At last, a rotor rubbing experiment is carried out, verifying the validity of the simulation results. The results show that the rub-impact stiffness affects bending vibration significantly and the torsional motion is sensitive to the friction coefficient. Correspondingly, the torsional responses show apparent fractional fault frequencies and rotating fault frequencies within the whole region of the rub-impact stiffness. The bending responses can only display fault frequencies at certain rub-impact stiffness. As for the rotating speed, the torsional responses are also more effective than the bending responses for the rub-impact fault detection at the low- and high-speed regions. The results will contribute to a comprehensive basis for the rub-impact fault detection.

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“…Axially moving tensioned beams are common constituent elements in many mechanical systems such as magnetic tapes, robotic manipulators, textile fibers, and conveyer belts [Chen, 2005a;Hua et al, 2005;Zhang and Ding, 2009;Sandilo and van Horssen, 2012]. One important problem in these axially moving systems is the occurrence of large unwanted transverse vibrations due to the parametric and external excitations.…”

Section: Introductionmentioning

confidence: 99%

Periodic and Chaotic Responses of an Axially Accelerating Viscoelastic Beam Under Two-Frequency Excitations

Ding

2013

Int. J. Appl. Mechanics

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This study focuses on the steady-state periodic response and the chaotic behavior in the transverse motion of an axially moving viscoelastic tensioned beam with two-frequency excitations. The two-frequency excitations come from the external harmonic excitation and the parametric excitation from harmonic fluctuations of the moving speed. A dynamic model is established to include the finite axial support rigidity, the material derivative in the viscoelastic constitution relation, and the longitudinally varying tension due to the axial acceleration. The derived nonlinear integro-partial-differential equation of motion possesses space-dependent coefficients. Applying the differential quadrature method (DQM) and the integral quadrature method (IQM) to the equation of the transverse motion, a set of nonlinear ordinary differential equations is obtained. Based on the Runge-Kutta time discretization, the time history of the axially moving beam is numerically solved for the case of the primary resonance, the super-harmonic resonance, and the principal parametric resonance. For the first time, the nonlinear dynamics is studied under various relations between the forcing frequency and the parametric frequency, such as equal, multiple, and incommensurable relationships. The stable periodic response and its sensitivity to initial conditions are determined using the bidirectional frequency sweep. Furthermore, chaotic motions are identified using different methods including the Poincaré map, the maximum Lyapunov exponent, the fast Fourier transforms, and the initial value sensitivity. Numerical simulations reveal the characteristics of the periodic, quasiperiodic, and chaotic motion of a nonlinear axially moving beam under two-frequency excitations.

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Lateral and Torsional Vibrations of a Two-Disk Rotor-Stator System With Axial Contact/Rubs

Cited by 10 publications

References 13 publications

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Theoretical and Experimental Study on the Transient Time‐Frequency Characteristics of the Bending‐Torsional Coupling Motions of a Rub‐Impact Dual‐Rotor System

Periodic and Chaotic Responses of an Axially Accelerating Viscoelastic Beam Under Two-Frequency Excitations

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