Active bump-type foil bearing with controllable mechanical preloads

Feng, Kai; Guan, Hanqing; Zhao, Zilong; Liu, Tianyu

doi:10.1016/j.triboint.2017.12.029

Cited by 42 publications

(21 citation statements)

References 14 publications

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“…The pressure generated in the film in the rigid case is higher and contributes to a faster movement towards the equilibrium position. Note that the result obtained in the rigid case is in good agreement with that published in the literature [4]. In Figure 9 when the speed increases (N ≥ 30, 000 rpm), the bearing becomes unstable and the center of the shaft then reaches extremely high eccentricities that can exceed the value of the initial radial clearance especially in the case of the compliant bearing.…”

Section: Resultssupporting

confidence: 88%

“…Among the technologies used successfully, one of them stands out with particularly interesting results and simple modeling: the technology of MITI-type stacking bearings [13]. Numerous numerical and experimental studies are interested in the static and dynamic characteristics of this type of bearings [4][5][6][7][8]14]. These papers focused on two areas:…”

Section: Mohawk Innovative Technology Incorporated (Miti) Technologymentioning

confidence: 99%

“…One of the objectives was to validate their thermomechanical behavior at high temperatures [1,2]. Currently, the fields of application are more extensive but still concern the guidance of shafts rotating at very high speed, withstanding moderate loads and subjected to sometimes severe thermal stresses [3][4][5][6][7][8]. Some of them [3,5,9] consider the coupling between the bearing and the rotor with deformation of the sheets and friction between the sheets and the support using complex and numerically time-consuming approaches.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Performances of Foil Bearing Supporting a Jeffcot Flexible Rotor System Using FEM

et al. 2020

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Aerodynamic bearings have received considerable attention in recent decades and are increasingly being used in applications where high speed, low loads and high precision are required. Aerodynamic applications mainly concern auxiliary power units (APU) and air-conditioning machines (ACM). From the industrial point of view, the static and dynamic characteristics of these bearings rotating at very high speed must be determined. According to the literature, studies carried out on this type of bearing consider the elastic deformations of the foils due to the pressure generated in the air film. The linear approach is from time to time adopted for the prediction of the dynamic behavior of these bearings, which is not always justified. This paper aims to present a step towards a better mastery of the non-linear dynamic behavior of a flexible rotor-air bearing system. We will focus on finite element modeling (FEM) of the non-linear isothermal elasto-aerodynamic lubrication problem in the case of a radial bearing operating in a dynamic regime. We will present the effects of rotational speed, unbalance eccentricity, and rotor mass on the non-linear response of rigid and compliant bearings. We use a partitioned approach which treats fluid and structure as two computation domains solved separately; reducing the development time needed for a monolithic code which is difficult to manage when the geometries or the physical properties of the problem to be treated become complex.

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Section: Resultssupporting

confidence: 88%

Section: Mohawk Innovative Technology Incorporated (Miti) Technologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Performances of Foil Bearing Supporting a Jeffcot Flexible Rotor System Using FEM

et al. 2020

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“…Feng et al 17 performed a static and dynamic analysis of the active bump foil bearing with control of the driving voltage of piezoelectric actuators, the mechanical preloads can be adjusted. The results from the analysis were demonstrated that the proposed structure was effective in controlling mechanical preload.…”

Section: Introductionmentioning

confidence: 99%

Turbocharger rotor vibration reduction methodology with an active control scheme

Mutra

Srinivas

Shaik

et al. 2021

Noise & Vibration Worldwide

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The turbocharger rotors are often supported on the dual film floating ring bearings that are meant for high-speed applications. The damping ability of these bearings is relatively high. However, due to highly nonlinear bearing forces, often system instability occurs. The present work focuses on the dynamic analysis and active vibration control studies of a practical turbocharger rotor system with the use electromagnetic actuator (EMA) system. Initially, the system is analyzed using the finite element approach. The inner and outer film forces are considered along with rotor imbalance forces. The dynamic responses at the critical operating speeds are obtained numerically. To minimize the vibration amplitudes, a tiny EMA system is installed at one of the nodes along the shaft. The effect of the EMA parameters such as the number of turns of winding coil around a pole ( N c) and pole-face area ( A a) on the response of the system is studied. Further, an open-loop control configuration is practically studied by using a vibration shaker at the bearing node under different operating speeds, and the percentage reduction in critical vibration amplitudes is recorded. The EMA system is effectively controlling the high-speed rotor system vibrations. The EMA parameters N c and A a are influencing the system vibration response. Further, an experimental result has given considerable vibration reduction with the present approach.

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“…However, with frequent start-up and shutdowns of the machines, the foils of the gas-dynamic foilbearings are subject to increased wear. This problem is solved by combination of a rolling-element bearing and the gasdynamic foil bearing, which allows to separate their work functions and achieve an optimal combination of useful properties of each type of bearings [1][2][3][4][5][6].The inclusion in the design of the hybrid bearing of various control and switching elements allows to control its characteristics [7][8][9]. One of the most important characteristics of the bearing unit is the load capacity [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Performance of the hybryd bearing with air-lubricated foil bearing and active control

Bondarenko¹,

Polyakov²,

Gorin³

2019

BALTTRIB

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many high-speed rotor units operate at supercritical frequencies, which means that undesirable oscillations inevitably occur during acceleration of the rotor to the operating frequency of rotation due to transition through these critical rotational frequencies. In addition, operating frequencies of the order of 100 000 revolutions per minute and more require new design and technological solutions that provide the specified indicators of speed, stability and wear of bearing surfaces. One of the ways to improve bearing units is to combine rolling and air-lubricated foil bearings into a hybrid bearing with active control, which improves the reliability and durability of the unit as a whole due to the separation and duplication of bearing functions in various operating modes. The article presents a general approach to the construction of a mathematical model of a hybrid bearing with active control and its performance.

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Active bump-type foil bearing with controllable mechanical preloads

Cited by 42 publications

References 14 publications

Dynamic Performances of Foil Bearing Supporting a Jeffcot Flexible Rotor System Using FEM

Dynamic Performances of Foil Bearing Supporting a Jeffcot Flexible Rotor System Using FEM

Turbocharger rotor vibration reduction methodology with an active control scheme

Performance of the hybryd bearing with air-lubricated foil bearing and active control

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