Experimental study on the characteristics of pad fluttering in a tilting pad journal bearing

Yang, Seong Heon; Kim, Chae-Sil; Lee, Yongbok

doi:10.1016/j.triboint.2005.05.006

Cited by 30 publications

(9 citation statements)

References 11 publications

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“…The pressure sensors are installed directly on the pad to measure the Besides, two proximity probes are mounted on the top of housing of bearing #1 to measure the movement of pads, which is the pad tilt angle. This is very useful in order to monitor the pad-fluttering phenomenon that could afflict the upper unloaded pads at low speeds and light loads [7,8]. Pad fluttering is a somewhat difficult phenomenon to overcome and is defined as the unstable vibration of the pad floating back and forth between the pivot point and the journal continuously during shaft rotation.…”

Section: Installed Sensorsmentioning

confidence: 99%

A Test Rig for Evaluating Tilting-Pad Journal Bearing Characteristics

Chatterton

Pennacchi

Dang

et al. 2015

Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

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Section: Installed Sensorsmentioning

confidence: 99%

A Test Rig for Evaluating Tilting-Pad Journal Bearing Characteristics

Chatterton

Pennacchi

Dang

et al. 2015

Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

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“…Although this order was rather close to 0.5X the supposition that this abnormal behavior was caused by an oil-whirl instability onset was discarded since the turbine shaft was mounted on tilting-pad journal bearings that, in general, are scarcely influenced by unstable phenomena except occasional events of pad-fluttering [27,28].…”

Section: Analysis Of a Case Historymentioning

confidence: 99%

Analysis of the Instability Phenomena Caused by Steam in High-Pressure Turbines

Pennacchi

Vania

2011

Shock and Vibration

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Abstract. Instability phenomena in steam turbines may happen as a consequence of certain characteristics of the steam flow as well as of the mechanical and geometrical properties of the seals. This phenomenon can be modeled and the raise of the steam flow and pressure causes the increase of the cross coupled coefficients used to model the seal stiffness. As a consequence, the eigenvalues and eigenmodes of the mathematical model of the machine change. The real part of the eigenvalue associated with the first flexural normal mode of the turbine shaft may become positive causing the conditions for unstable vibrations. The original contribution of the paper is the application of a model-based analysis of the dynamic behavior of a large power unit, affected by steam-whirl instability phenomena. The model proposed by the authors allows studying successfully the experimental case. The threshold level of the steam flow that causes instability conditions is analyzed and used to define the stability margin of the power unit.

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“…When the rotational speed is increasing, the whirl smoothly transforms into whip, and at a certain speed, the whip may disappear and the secondmode whirl starts again. An analysis of oil whirl and oil whip in journal bearing lubrication is also described in [6][7][8][9][10]. For instance, Schweizer [6] investigated the occurring oil whirl/whip effects for a Laval rotor by means of run-up simulations.…”

Section: Introductionmentioning

confidence: 99%

“…In [7], the authors presented an analysis method for the dynamic behaviour of a rotating system under the oil whirl and oil whip phenomenon, considering the influence of unbalance, rotor arrangement and bearing parameters on the instability threshold. Moreover, in [10], an experimental study was performed to investigate the fluttering characteristics of a tilting pad journal bearing with the variation of supply oil flow rate, shaft speed and bearing load.…”

Section: Introductionmentioning

confidence: 99%