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

Aguirre, Gorka; Al‐Bender, Farid; Brussel, Hendrik Van

doi:10.1016/j.precisioneng.2010.01.004

Cited by 58 publications

(32 citation statements)

References 12 publications

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“…Another way is through the electric or pneumatic precision electronic components to control the throttle effect of aerostatic bearings, in order to obtain high stiffness [13]. Aguirre et al study [14] is driven by an electromagnetic drive mechanism to control the gas film clearance changes, so as to improve the bearing stiffness. Ghodsiyeh et al [15] adopt pneumatic control as a semiactive compensation and improve the aerodynamic stiffness of the air bearing, and the main parameters affecting the static performance of the system are discussed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Study on the Gas-Solid Coupling of the Aerostatic Thrust Bearing with Elastic Equalizing Pressure Groove

Zhao

Zhang

Hao

et al. 2017

Shock and Vibration

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Aiming at the problem of low stiffness of aerostatic bearing, according to the principle of gas-solid coupling, this paper designs a kind of aerostatic thrust bearing with elastic equalizing pressure groove (EEPG) and investigates the effect of elastic equalizing pressure groove (EEPG) on the stiffness of aerostatic bearing. According to the physical model of the bearing, one deduces the deformation control equation of the elastic equalizing pressure groove and the control equation of gas lubrication, using finite difference method to derive the control equations and coupling calculation. The bearing capacity and stiffness of aerostatic bearing with EEPG in different gas film clearance are obtained. The calculation results show that the stiffness increased by 59%. The results of numerical calculation and experimental results have good consistency, proving the gas-solid coupling method can improve the bearing stiffness.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Study on the Gas-Solid Coupling of the Aerostatic Thrust Bearing with Elastic Equalizing Pressure Groove

Zhao

Zhang

Hao

et al. 2017

Shock and Vibration

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“…As shown in Table 6, state of the art technologies [41][42][43][44][45][46][47][48][49][50][51][52] highlight the potential benefits of the H2-LQG controller that was integrated in the proposed AVC device. In particular, the H2-LQG controller is one of the most promising regulators that provides an effective trade-off between displacement compensation and high accuracy performances in a broad frequency range (200-450 Hz).…”

Section: Discussionmentioning

confidence: 99%

Real-Time Performance of Mechatronic PZT Module Using Active Vibration Feedback Control

Aggogeri¹,

Borboni²,

Merlo³

et al. 2016

Preprint

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This paper proposes an innovative mechatronic piezo-actuated module to control vibrations in modern machine tools. Vibrations represent one of the main issues that seriously compromise the quality of the workpiece. The active vibration control (AVC) device is composed of a host part integrated with sensors and actuators synchronized by a regulator; it is able to make a self-assessment and adjust to alterations in the environment. In particular, an innovative smart actuator has been designed and developed to satisfy machining requirements during active vibration control. This study presents the mechatronic model based on the kinematic and dynamic analysis of the AVC device. To ensure a real time performance, a H2-LQG controller has been developed and validated by simulations involving a machine tool, PZT actuator and controller models. The Hardware in the Loop (HIL) architecture is adopted to control and attenuate the vibrations. A set of experimental tests has been performed to validate the AVC module on a commercial machine tool. The feasibility of the real time vibration damping is demonstrated and the simulation accuracy is evaluated.

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“…In [6], [7] CFD and FDM methods are applied to investigate static and dynamic behavior of bearings with small supply holes, the numerical results are also experimentally verified. In [8] a multi-physics finite element model is adopted to consider the interaction between the air flow dynamics and the structural flexibility of the bearing.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Squeeze Effect in a Gas Thrust Bearing

Colombo¹,

Moradi²,

Raparelli³

et al. 2017

Materials and Contact Characterisation VIII

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The squeeze effect of a gas thrust bearing is calculated using both a distributed parameters (DP) model and a lumped parameters (LP) model. A rectangular thrust bearing with no supply holes is considered in the analysis. In dynamic conditions, pressure values p1 and p2 are calculated. In steady-state conditions, these values coincide with ambient pressure pa. The developed LP model was validated with the DP model for a pad shape ratio (length/width) in the range of 0.5 to 2. Both models are validated in the literature in about a 1D parallel slider. The LP model has the advantage of faster implementation in comparison to the DP model. The LP model is also linearized by using a perturbation method to obtain the analytic expression of the dynamic stiffness. Therefore, it is possible to explain the effect of geometrical parameters on stiffness and damping coefficients. Keywords: squeeze film air thrust bearing, lumped parameters model, dynamic stiffness. INTRODUCTION Recently in literature, most of the air bearings are analyzed with distributed parameters (DP) methods, using finite difference technique (FDM) [1], [2] or finite element method (FEM)[3], [4]. Also, CFD models can be used to study the pressure distribution; for example, in [5] the pressure depression effect in aerostatic thrust bearing is investigated. In [6], [7] CFD and FDM methods are applied to investigate static and dynamic behavior of bearings with small supply holes, the numerical results are also experimentally verified. In [8] a multi-physics finite element model is adopted to consider the interaction between the air flow dynamics and the structural flexibility of the bearing.Generally, all these methods achieve high precision in results but the solution can require long computation time due to the high number of nodes used for the discretization of the pad surface. Also, the identification of the parameters that influence the behavior is not easy.A lumped parameters model can be alternatively used as a fast design tool for air bearings. It does not require the use of commercial software and can be successfully adopted both for static and dynamic study. Due to its quite good precision and low number of parameters, this method allows an easy design and understanding of the phenomena.For simple geometries, analytical and lumped parameters methods were preferred in the past, when the computational speed was not high. Paper [9] presents analytical study of static characteristics of the bearings, papers [10], [11] show dynamic performance and stability criteria of aerostatic bearings adopting linearized equations of motion.Recently in [12] a lumped parameters model is proposed to study the static performance of a multiple supply holes rectangular pad. The results of load capacity, stiffness and air consumption were obtained in dimensionless form by chancing position, numbers and diameters of supply holes.About the dynamic behavior of air pads in [13] the time response of the force to a step variation of the air gap is analyzed. Results with ...

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

Cited by 58 publications

References 12 publications

Numerical Simulation and Experimental Study on the Gas-Solid Coupling of the Aerostatic Thrust Bearing with Elastic Equalizing Pressure Groove

Numerical Simulation and Experimental Study on the Gas-Solid Coupling of the Aerostatic Thrust Bearing with Elastic Equalizing Pressure Groove

Real-Time Performance of Mechatronic PZT Module Using Active Vibration Feedback Control

Evaluation of Squeeze Effect in a Gas Thrust Bearing

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