Experimental Investigation of Dynamic Properties of an Active Journal Bearing

Sun, L.; Krodkiewski, J.M.

doi:10.1006/jsvi.1999.2671

Cited by 39 publications

(13 citation statements)

References 5 publications

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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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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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“…Sun, et al [19,20] design a new bearing which includes deformable thin wall. Hydraulic valve controls recess pressure to adjust the thin wall's deformation in the operation, then, changing the bearing's clearance, namely, oil film thickness, and pressure distribution.…”

Section: Active Control Of Hydrostatic Journal Bearingmentioning

confidence: 99%

The Stability’s Influencing Factors and Active Control of Hydrostatic Journal Bearing

Peng¹,

Lu²,

Chen³

et al. 2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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Abstract. The hydrostatic bearings are widely applied in the field of high-speed precision grinding machine due to high precision and high stiffness. But in order to make the hydrostatic bearings more fit for the precision machining with high speed, we have to solve the instability problem of system due to rotor vibration. The factors that have effect on the stable characteristic of hydrostatic bearings are analyzed and commented. Then the research status of active control of hydrostatic journal bearing is studied. At last we take the prospect and forecast of hydrostatic bearing's development tendencies.

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“…In the last decades, actuators and sensors have been incorporated into rotating machines aiming at attenuating and controlling the vibration levels, especially those presented by the shaft [3][4][5][6]. In such cases, the actuators can also be used as exciters, and open-loop frequency response of the system can be identified.…”

Section: Introductionmentioning

confidence: 99%

Self-Identification Algorithm for the Autonomous Control of Lateral Vibration in Flexible Rotors

Buttini

Nicoletti

2012

International Journal of Rotating Machinery

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Intelligent machines are capable of recognizing their operational condition and take actions towards optimality through an autonomous processing of information. Considering the importance of rotating machines in modern industry, this concept of intelligent machines can be applied to achieve high availability, thus avoiding interruptions in the production flow. In this work, a self-identification algorithm is proposed for the autonomous decision and control of a flexible shaft rotating system with electromagnetic actuators. Based on the D-decomposition technique, the algorithm searches in the domain of controller gains the best ones for P and PD controllers to reduce maximum peak response of the shaft. For that, frequency response functions of the system are automatically identified experimentally by the algorithm. It is demonstrated that regions of stable gains can be easily plotted, and the most suitable gains can be found to minimize the resonant peak of the system in an autonomous way, without human intervention.

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Experimental Investigation of Dynamic Properties of an Active Journal Bearing

Cited by 39 publications

References 5 publications

Controllable Sliding Bearings and Controllable Lubrication Principles—An Overview

Controllable Sliding Bearings and Controllable Lubrication Principles—An Overview

The Stability’s Influencing Factors and Active Control of Hydrostatic Journal Bearing

Self-Identification Algorithm for the Autonomous Control of Lateral Vibration in Flexible Rotors

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