Characterization of a controllable stiffness foil bearing with shape memory alloy springs

Feng, Kai; Cao, Yuanlong; Yu, Ke; Guan, Hanqing; Wu, Yihua; Guo, Zhiyang

doi:10.1016/j.triboint.2019.03.068

Cited by 34 publications

(20 citation statements)

References 23 publications

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“…Advantages / Potentials Drawbacks / Inconveniences the GFBs' Performance 1. GFB equipped with SMAwires substituting bump foils [27] Straightforward active method to control the bearing's stiffness via thermal activation-managing heating (making use of electric current) and cooling (with dedicated pipes with fluids) processes; capability of the bearing's damping control Relatively high inertia of the control process due to the nature of the thermally induced mechanical responses of SMAs, e.g., compared to the PZT-based solutions; Requirement of an effective cooling method 2. Concept of a GFB equipped with SMA wires installed on a top foil [20,21] Straightforward passive method dedicated to reduce mechanical vibrations via energy dissipation available for the phenomenon of superelasticity; experimentally validated SMA wire models for both isothermal and non-isothermal phase transformations dedicated for future use in GFB models Not yet experimentally validated complete SMA-based GFB model 3.…”

Section: Methods Used To Enhancementioning

confidence: 99%

“…Both the memory effects and superelasticity may be employed in GFBs to effectively enhance their operational properties. The authors of the work [27] propose to substitute bump foils in a GFB with SMA wires (circumferentially distributed springs). Hence, active elasto-damping properties control becomes feasible via thermal activation.…”

Section: Applications Of Shape Memory Alloys To Gas Foil Bearingsmentioning

confidence: 99%

“…Improvement of elasto-damping properties (referenced in Figure 2) via passive [16][17][18][19][20][21][22][23][24] and active methods [25][26][27][28][29][30][31][32][33][34][35].…”

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confidence: 99%

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Gas Foil Bearing Technology Enhanced with Smart Materials

et al. 2021

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The paper discusses a perspective of the usage of various types of smart materials to enhance the operational properties of Gas Foil Bearings. The authors, referring to the current investigation on thermomechanical characteristics of the above-mentioned bearing type, have focused on the concept of using Shape Memory Alloys, Piezoelectric Transducers, Thermoelectric Modules and Thermocouples to improve both mechanical and thermal behavior of the bearings. Based on the available literature and the authors’ experience, the present work provides an overview of the known and perspective applications of smart materials to Gas Foil Bearings. In particular, a discussion on their capabilities, limitations and effectiveness is conducted, taking into account the unique characteristics and requirements of the studied type of bearings.

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Section: Methods Used To Enhancementioning

confidence: 99%

Section: Applications Of Shape Memory Alloys To Gas Foil Bearingsmentioning

confidence: 99%

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Gas Foil Bearing Technology Enhanced with Smart Materials

et al. 2021

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“…The bearing load capacity increases with the rise of the rotational speed until it reaches a certain value [33]. Meanwhile, GFBs will become unstable as the increase speed due to the sub-synchronous vibration (cross-coupled stiffness) [34][35][36]. The suitable work scope of GFBs is shown in Fig.…”

Section: Operation Range Of Gfbs and Ambsmentioning

confidence: 99%

Theoretical investigation of hybrid foil-magnetic bearings on operation mode and load sharing strategy

Zhang

Yin

Guan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents a theoretical investigation on operation mode and load sharing strategy of hybrid foil-magnetic bearings (HFMBs). According to the inherent characteristics of gas foil bearings (GFBs) and active magnetic bearings (AMBs), six possible work scopes are discussed to understand the operation mode of HFMBs. A numerical model coupling the calculations of the film pressure in GFBs and the magnetic forces in AMBs is conducted to predict the operation performance of HFMBs. The accuracy of the model is proved by comparing the predicted and tested friction torques. Analysis on the static and dynamic performance of HFMBs within three representative cases is conducted by varying the load sharing ratio. The dynamic supporting stiffness and operation position of HFMBs can be obviously enhanced by adjusting the operating mode and load sharing strategy. Results show that the direct stiffness and dynamic damping of HFMBs adopting hybrid mode are significantly higher than those adopting AMB or GFB independent mode.

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“…In recent years, a new type of foil bearing that combines a magnetic bearing or a static pressure air bearing is proposed for the purpose of friction reduction during the starting and stopping operations [6][7][8]. Feng et al also proposed a new type of foil bearing that used a shape memory alloy spring as a support structure and could actively vary the bearing stiffness and damping performance according to the operating condition [9]. As explained above, the structure of a foil bearing tends to be more complex with the proposed improvements.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Lubrication Performance of Foil Bearings with New Texturing

2019

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Foil bearings have excellent characteristics such as a high damping performance and acceptable dimensional changes caused by installation errors and thermal expansion. However, the problem of large friction losses also occurs at the top foil under the high rotational speed required to support a shaft without any contact. In this paper, a new type of foil bearing with a surface texture on the top foil is proposed. The effects of the texture were verified by the rotational motion experimental analysis under a high circumferential speed and dry lubrication. For a bearing with dimples on the contact area, the effect of friction reduction could be observed under boundary lubrication. Moreover, it was also confirmed that the dimples adversely affected the air film formation with the sliding speed increase. For a newly designed F-grooved model, the phenomenon of an early transition from boundary lubrication to fluid lubrication can be seen. However, the friction coefficient increases at the boundary lubrication. In this study, it was also the highest friction reduction effect was confirmed at the maximum sliding speed. Furthermore, an additional friction reduction effect and a small temperature rise were obtained by combining the above textures.

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Characterization of a controllable stiffness foil bearing with shape memory alloy springs

Cited by 34 publications

References 23 publications

Gas Foil Bearing Technology Enhanced with Smart Materials

Gas Foil Bearing Technology Enhanced with Smart Materials

Theoretical investigation of hybrid foil-magnetic bearings on operation mode and load sharing strategy

Evaluation of Lubrication Performance of Foil Bearings with New Texturing

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