Simulation and Control of an Active Tilting-Pad Journal Bearing

Deckler, D.C.; Veillette, Robert J.; Braun, M. J.; Choy, F. K.

doi:10.1080/05698190490463277

Cited by 55 publications

(32 citation statements)

References 10 publications

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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%

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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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Section: Different Types Of Actuationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the future of controllable fluid film bearings

Santos

2011

Mécanique & Industries

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“…The following ways of rotor's location control can be highlighted: 1) by means of adjusting the value and the configuration of the gap between a rotor and a bearing, e.g. tilting-pad bearings [13];…”

Section: Rotor Trajectories Correctionmentioning

confidence: 99%

Rotor Trajectories in Fluid-Film Bearings, Adjustment of Them and Energy Efficiency Parameters

et al. 2016

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Abstract. The problem of rotor machines modification requires development of new approaches to the design of specific nodes. As bearings are considered the most important elements of rotor machines, such approaches can imply the application of active control. In the present paper using the example of fluid-film bearings the approach is considered to enchancing energy efficiency of rotor machines by means of generating optimal trajectories. Means are shown to analyze the dynamics of a rotor system and types of the obtained trajectories. The paper also covers the approach to setting the criteria of energy efficiency of rotor's trajectories. After the optimal trajectory is obtained, active bearings are proved feasible to control the displacement of a rotor by generating a force to match the actual trajectory to the calculated one, and by this to decrease the energy loss.

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“…Direct and indirect actions of control forces onto the rotating shaft can occur either via bearing housing and bushing [19][20][21][22][23][24][25][26][27][28][29] or via bearing clearance [13][14][15][16][17][18]27]. The control actions influence fundamentally four parameters: either the bearing gap function h(θ) [21][22][23][24][25][26] and its gradient dh/dθ [23][24][25], or the fluid viscosity µ [30][31][32], or the fluid film pressure field p(θ) [13][14][15][16][17][18]27]. All four parameters are directly and explicitly written in the Reynolds and Energy equations and significantly affect the bearing properties.…”

Section: Strategies For Rendering Adaptability and Multi-functionalitmentioning

confidence: 99%

Controllable Sliding Bearings and Controllable Lubrication Principles—An Overview

Santos

2018

Lubricants

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Hydrodynamic and aerodynamic lubrication regimes in their controllable forms have been intensively investigated over the last two decades. With the aim of reducing friction and improving thermal, static, and dynamic characteristics of radial sliding bearings, different types of electro-mechanical actuators have been coupled to such bearings. Depending on (i) the actuator type; (ii) the actuation principle, i.e., hydraulic, pneumatic, piezoelectric or magnetic among others; and (iii) how such an actuator is coupled to the sliding bearings, different regulation and control actions of fluid film pressure and lubricant flow can be obtained. The most common actions are: (a) the control of the injection pressure to modify the fluid film pressure statically as well as dynamically; (b) the adjustment of the angle and direction of injection flow (mostly passive action); (c) the control of the sliding bearing gap and its preload via moveable and compliant sliding surfaces; and (d) the control of the lubricant viscosity. All four parameters, i.e., pressure, flow (velocity profiles), gap and viscosity, are explicit parameters in the modified form of Reynolds' equations for active lubrication. In this framework, this paper gives one main original contribution to the state-of-the-art of radial sliding bearings and controllable lubrication: a comprehensive overview about the different types of controllable sliding bearings and principles used by several authors. The paper ends with some conclusive remarks about advantages and drawbacks of the different design solutions for controllable sliding bearings and the main challenges to be overcome towards industrial applications.

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Simulation and Control of an Active Tilting-Pad Journal Bearing

Cited by 55 publications

References 10 publications

On the future of controllable fluid film bearings

On the future of controllable fluid film bearings

Rotor Trajectories in Fluid-Film Bearings, Adjustment of Them and Energy Efficiency Parameters

Controllable Sliding Bearings and Controllable Lubrication Principles—An Overview

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