Active inherent restrictor for air-bearing spindles

Mizumoto, Hiroshi; Arii, Shiro; Kami, Yoshio; Goto, Kenji; Yamamoto, Tsuyoshi; Kawamoto, Masashi

doi:10.1016/s0141-6359(96)00041-4

Cited by 53 publications

(19 citation statements)

References 2 publications

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“…The first controllable air bearing design [8] demonstrated that the bearing stiffness varied with the position of a pad. A design solution with active inherent restrictors [3] showed the feasibility of reducing vibrations with a proportional-integral (PI) controller. Another design featuring the radial injection of pressurised air through piezo-actuated injectors [6] illustrated the possibility of increasing the damping by means of a proportional-derivative (PD) controller.…”

Section: Literature Surveymentioning

confidence: 99%

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Enhancing damping of gas bearings using linear parameter-varying control

Theisen

Niemann

Galeazzi

et al. 2017

Journal of Sound and Vibration

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a b s t r a c tJournal bearings can be lubricated through controllable injectors using pressurised fluids, whose viscosity highly determines the dynamic responses of the rotating machine. The use of fluids with low viscosity is attracting a growing interest due to the reduced friction forces and consequent losses when the machine is in operation. However low viscosity also entails poor damping properties, which may lead to degraded performance or even instability when the rotating machine operates at or near one of the modal frequencies. This issue can be properly addressed by employing active feedback control systems to regulate the injection pressure of the fluid. Due to the strong dependencies of system performance on system parameters, the sought controller should be robust over a large range of operational conditions. This paper addresses the damping enhancement of controllable gas bearings through robust control approaches. Through an extensive experimental campaign the paper evaluates two robust controllers, a linear parametervarying (LPV) controller and ∞  controller, on their capability to guarantee stability and performance of a gas bearing across the large operational envelopes in rotational speed and injection pressure. The control systems are designed applying state-of-the-art methods in the respective areas. The experimental results clearly demonstrate the feasibility of enhancing the damping properties of a gas bearing by means of robust control methods.

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Section: Literature Surveymentioning

confidence: 99%

“…State-of-the-art methods in LPV and ∞ H control theories are applied to design two robust regulators according to the mixed sensitivity set-up. These control systems represent a clear technological advancement in the field of gas bearings, where so far only P, PI, PD and LQG regulators were designed and tested [3,6,10,9].…”

Section: Contributionsmentioning

confidence: 99%

Enhancing damping of gas bearings using linear parameter-varying control

Theisen

Niemann

Galeazzi

et al. 2017

Journal of Sound and Vibration

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“…The simplest to implement is feeding pressure control, which only needs a pressure regulator upstream the air flow into the bearing, but gives a low compensation bandwidth [1]. Better performing solutions are based on modifying the shape of the flexible bearing pad, either by acting locally around the restrictor [7], or by acting on the periphery of the bearing plate and modifying the conicity [8]. A further discussion can be found in [6], showing that conicity control is a very effective activation method for both position control and disturbance compensation.…”

Section: Active Compensation On Air Bearingsmentioning

confidence: 99%

A multiphysics model for optimizing the design of active aerostatic thrust bearings

Aguirre

Al‐Bender

Brussel

2010

Precision Engineering

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“…The second restrictor is exhaust controlled restrictor [11] The exhaust control restrictor consists of a piezoelectric actuator, amplifier and preload screw. It controls the air gap by changing the coefficient of the exhaust channel [12]. It is also tried to control air bearing with exhausted controlled restrictor with help of displacement feedback, and aero-statically controlled restrictor which has pressure feedback [13,14].…”

Section: Introductionmentioning

confidence: 99%

A New Type of Aerostatic Thrust Bearing Controlled by High-speed Pneumatic Valve and a Novel Pressure Transducer

Rehman

Guiyun

Wang

et al. 2019

IJAME

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The current research work presents a low cost, efficient and innovative active aerostatic thrust bearing which is controlled through a combination of the Arduino board, feedback transducers and high-speed valves. The purpose is to make low cost, compact active aerostatic thrust bearing with overall small dimensions and compact size. A prototype design is done in solid works with small dimensions and components are produced with the help of the high precision machining process. There are two high-speed electropneumatic valves which are controlled through pulse width modulation techniques. These high-speed electro-pneumatic valves modify the supply pressure of aerostatic bearing to achieve desired air height gap. There are two novel pressure sensors which provide a feedback signal for control. The test bench to perform experiments has been explained. The performance of the proposed aerostatic bearing is checked both in open loop and closed loop configuration with respect to static and dynamic conditions.

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Active inherent restrictor for air-bearing spindles

Cited by 53 publications

References 2 publications

Enhancing damping of gas bearings using linear parameter-varying control

Enhancing damping of gas bearings using linear parameter-varying control

A multiphysics model for optimizing the design of active aerostatic thrust bearings

A New Type of Aerostatic Thrust Bearing Controlled by High-speed Pneumatic Valve and a Novel Pressure Transducer

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