Model-Based Control of Active Tilting-Pad Bearings

Wu, An; Cai, Zhihua; Queiroz, M.S. de

doi:10.1109/tmech.2007.911636

Cited by 24 publications

(16 citation statements)

References 9 publications

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“…In [10] the study of the dynamic behavior of a DFIM as a shaft machine by implementing vector control was studied with very promising results operating either in the motoring or the generating mode. In [11][12][13][14][15][16] a detailed description of the tilting-pad journal bearing is given accompanied by the relevant mathematical background. Finally, in [18] the mathematical model of a rotor supported on journal bearings is presented.…”

Section: Gyroscopic Moment Of Inertiamentioning

confidence: 99%

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Contribution to a detailed modeling and more reliable simulation of a ship's shaft machine

Dermentzoglou

Prousalidis

2015

2015 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS)

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In the following investigation the modeling of the complete electromechanical system of a doubly fed induction machine is discussed for power production/electric propulsion purposes, when being incorporated as a shaft generator into a ship's system. When the doubly fed induction machine serves as a power production machine, contributes to lower emission of CO 2 and fuel saving since its capable of working at different speed (lower) than synchronous. This coincide with the enforcement with which the International Maritime Organization (IMO) and the EU demand reduction of Ship's emissions. The final goal within the frame of this paper is the development of a reliable mathematical model for the mechanical system which includes rotor dynamics and dynamics of tilting-pad journal bearings. The rotor dynamics are expressed in terms of complex variables for the planar coordinates. The total approach aspires to the development of a well established basis for studying the interactions between the electrical and mechanical subsystems and capable of expanding with more complicated models suitable for a reliable design or analysis of various types of faults.

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Section: Gyroscopic Moment Of Inertiamentioning

confidence: 99%

“…The fluid forces are calculated as in [16] and have to be transferred to stationary coordinates [18].…”

Section: A Modeling the Rotor (Stern Shaft )Systemmentioning

confidence: 99%

Contribution to a detailed modeling and more reliable simulation of a ship's shaft machine

Dermentzoglou

Prousalidis

2015

2015 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS)

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“…Examples of case (I) can be found in [2][3][4][5] using magnetic and piezoelectric pushers and in [6][7][8] using hydraulic actuators. Examples of case (II) can be found in variable impedance bearings [9], actively controlled bearing surface profiles or simply deformable bushes [10], active journal bearings with flexible sleeves [11,12], active lubricated bearings [13][14][15], or pressurized bearings [16,17] among others.…”

Section: Different Types Of Actuationmentioning

confidence: 99%

“…magnetic bearings [1], piezoelectric bearing pushers [2][3][4][5], hydraulic actuator journal bearings [6][7][8], variable impedance bearings [9], actively controlled bearing surface profiles or simply deformable bushes [10], active journal bearings with flexible sleeves [11,12], active lubricated bearings [13][14][15], or pressurized bearings [16,17] among others. The rapid development of these new mechatronic devices shows that the relative maturity of many "traditional technologies" implies little or no potential for significant improvements of machine performance.…”

Section: Introductionmentioning

confidence: 99%

On the future of controllable fluid film bearings

Santos

2011

Mécanique & Industries

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Keywords: fluid film bearings, vibration control, friction reduction, temperature effect, stability. Mots clés : paliers de film fluide, contrôle des vibrations, réduction de friction, effet de température, stabilité.This work gives an overview of the theoretical and experimental achievements of mechatronics applied to fluid film bearings. Compressible and uncompressible fluids are addressed. Rigid and elastic (deformable) bearing profiles are investigated. Hydraulic, pneumatic, magnetic and piezoelectric actuators are used. The ideas of combining control techniques, informatics with hydrodynamic, thermo-hydrodynamic, elastohydrodynamic and thermo-elasto-hydrodynamic lubrication techniques are carefully explored in this paper, considering theoretical as well as experimental aspects. The main goal of using controllable fluid film bearings is to improve the overall machine performance by: controlling the lateral vibration of rigid and flexible rotating shafts; modifying bearing dynamic characteristics, such as stiffness and damping properties; increasing the rotational speed ranges by enhancing damping and eliminating instability problems, for example, by compensating cross-coupling destabilizing effects; reducing start-up torque and energy dissipation in bearings; compensating thermal effects. It is shown that such controllable fluid film bearings can act as "smart" machine components and be applied to rotating and reciprocating machines with the goal of avoiding unexpected stops of plants, performing rotordynamic tests and identifying model parameters "on site". Emphasis is given to the controllable lubrication (hybrid and active) applied to different types of oil film bearings under different lubrication regimes, i.e., as tilting-pad journal bearings, multirecess journal bearings and plain journal bearings. After a comprehensive overview of the theoretical and experimental technological advancements achieved in university laboratories, the feasibility of industrial applications are highlighted, trying to foresee the future trends of such mechatronic devices.

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“…In Cai, et al (8), the hydrodynamic force was modeled as a linear springdamper with unknown damping and stiffness coefficients, and an adaptive feedback controller was designed to asymptotically regulate the journal displacement to the bearing center. A dynamic model of the active tilting-pad bearing system was proposed in Wu, et al (9), where the hydrodynamic force was modeled as a nonlinear squeeze-film damper plus repellent spring. A modelbased nonlinear controller was then designed and experimentally tested.…”

Section: Introductionmentioning

confidence: 99%

A New Active Tilting-Pad Bearing: Nonlinear Modeling and Feedback Control

Queiroz

2010

Tribology Transactions

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This article introduces a new type of active fluid film bearing and its feedback control. In particular, the active adjustment of the angular velocity of the pads of a tilting-pad bearing in response to changes in the operating conditions of the rotating machine is proposed. This is motivated by the observation that there is more control authority in the pad tilting motion than in its radial translation. To this end, a dynamic model for the bearing system is first developed, inclusive of the nonlinear hydrodynamic force for the infinitely short bearing case. A modelbased controller is then constructed, based on measurements of the journal position and velocity and pad tilting angles, to ensure that the journal is asymptotically regulated to the bearing center. Numerical simulations illustrate the performance of the active bearing under the proposed control in comparison with the bearing's standard passive mode of operation.

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Model-Based Control of Active Tilting-Pad Bearings

Cited by 24 publications

References 9 publications

Contribution to a detailed modeling and more reliable simulation of a ship's shaft machine

Contribution to a detailed modeling and more reliable simulation of a ship's shaft machine

On the future of controllable fluid film bearings

A New Active Tilting-Pad Bearing: Nonlinear Modeling and Feedback Control

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