Analysis of vibration in shaft-disc-blades systems due to power faults using a finite element method

Chao, Chia‐Ter; Chiang, Tsung-Lin Fan; Chyn, C.; Wang, Chi-Jo

doi:10.1080/02533839.2011.565597

Cited by 2 publications

(2 citation statements)

References 24 publications

(15 reference statements)

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“…In the past, researchers have studied the dynamic stability of a typical rotor shaft in many different forms by varying parameters such as internal damping, torque, tip-rub, pulsating axial force etc [10][11][12][13][14][15][16][17][18][19][20][21][22] . However in general, these studies invariably consider the bladed-disk American Institute of Aeronautics and Astronautics assembly as rigid with entire flexibility of the dynamical system limited to the shaft material only.…”

Section: Introductionmentioning

confidence: 99%

Rotordynamic Analysis of Asymmetric Turbofan Rotor Due to Fan Blade-out Event with Contact-Impact Rub Loads

Sinha¹,

Ojha²

2012

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

3
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1
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Loss of a blade from a running turbofan rotor introduces not only huge imbalance into the dynamical system rather it makes the entire rotor asymmetric as well. In an asymmetric rotor, the various terms of mass, gyroscopic and stiffness matrices also become time-dependent. In this paper, all the dynamical equations include the effect of the rotary inertia and gyroscopic moments as a result of both shaft bending as well as staggered blades flexing in-and-out of the plane of the disk. The governing equations also account for internal material damping in the shaft and the external damping in the bearing. In addition to the unbalance load at the disk location, the shaft may also be subjected to a torque and axial forces. Here, the fan blades are modeled as pre-twisted thin shallow shells. They have coupled flexural-torsional motion as well as extensional degrees-of-freedom in the longitudinal spanwise direction of the blade. The effect of blade tip rub forces being transmitted to the shaft are analyzed in terms of the dynamic stability of the rotor, especially during windmilling.

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Section: Introductionmentioning
confidence: 99%

Rotordynamic Analysis of Asymmetric Turbofan Rotor Due to Fan Blade-out Event with Contact-Impact Rub Loads
Sinha¹,
Ojha²
2012
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
3
0
1
0
View full text Add to dashboard Cite

show abstract

“…In the past, researchers have studied the dynamic stability of a typical rotor shaft in many different forms by varying parameters such as internal damping, torque, tip-rub, pulsating axial force etc. [14][15][16][17][18][19][20][21][22][23][24][25]. However in general, these studies invariably consider the bladed-disk assembly as rigid with entire flexibility of the dynamical system attributed to the shaft material with an artificial nonlinear spring to account for blade-tip rub forces.…”

mentioning
confidence: 99%

Rotordynamic analysis of asymmetric turbofan rotor due to fan blade-loss event with contact-impact rub loads
Sinha
¹

2013
Journal of Sound and Vibration
108
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52
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Rotordynamic analysis of asymmetric turbofan rotor due to fan blade-loss event with contact-impact rub loads Loss of a blade from a running turbofan rotor introduces not only huge imbalance into the dynamical system rather it makes the entire rotor asymmetric as well. In a nonsymmetric rotor, the various terms of mass, gyroscopic and stiffness matrices also become timedependent. In this paper, all the dynamical equations include the effect of the rotary inertia and gyroscopic moments as a result of both shaft bending as well as staggered blades flexing in-and-out of the plane of the disk. The governing equations also account for internal material damping in the shaft and the external damping in the support bearing system. In addition to the unbalance load at the disk location, the shaft may also be subjected to a torque and axial forces. Here, the fan blades are modeled as pre-twisted thin shallow shells. They have coupled flexural-torsional motion in the lateral out-of-plane direction as well as extensional degrees-of-freedom in the longitudinal spanwise direction of the blade airfoil. The effect of blade tip rub forces being transmitted to the shaft are analyzed in terms of the dynamic stability of the rotor, especially during windmilling.1 Sunil K.Sinha GE Aviation, General Electric Company, Cincinnati, OH 45215, USA blade-loss event on an engine are of proprietary nature and are not currently available in public domain. Any experiment simulating blade-loss or tip-rub under controlled conditions [11] is not only extremely expensive, rather sometimes they involve serious risk to the safety of the rig and the test personnel as well. As such there is a scarcity of test data, to compare the results of any fan blade-out analytical model in the published literature. However there are ample information from the actual field events and their investigation reports [12], which provide the necessary evidence about the magnitude of the dynamic loads due to fan blade-loss under operating conditions of a turbofan engine.In the aftermath of blade-loss, the fan-disk rotating system starts moving off-center in the heavier side of the disk due to sudden large imbalance introduced on the rotor-shaft. This eccentric rotor no longer remains symmetric about its center of rotation, and the spinning of the asymmetric rotor introduces another set of nonlinearities. Recently an attempt has been made to analyze the free vibrational characteristics of a weakly asymmetric rotor [13]. The present work is the first paper of its kind in the field of rotormechanics which addresses the forced transient response of an asymmetric flexible bladed-rotor with also considering the casing rub-surface flexibility in its formulation while the outer fan-case is still effectively undeformed. The inner surface abradable flexibility is expressed by an equivalent term K Rub and its dynamic effect on the blade-tip is included using a penalty method approach.In this paper, we consider the transient dynamic response of a complete rotor system in a jet engine w...

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Analysis of vibration in shaft-disc-blades systems due to power faults using a finite element method

Cited by 2 publications

References 24 publications

Rotordynamic Analysis of Asymmetric Turbofan Rotor Due to Fan Blade-out Event with Contact-Impact Rub Loads

Rotordynamic Analysis of Asymmetric Turbofan Rotor Due to Fan Blade-out Event with Contact-Impact Rub Loads

Rotordynamic analysis of asymmetric turbofan rotor due to fan blade-loss event with contact-impact rub loads

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