Improvement of high-speed stability of an aerostatic bearing-rotor system using an active magnetic bearing

Kim, Jong-Won; Han, Dong-Chul; Jang, Dong Kee; Ahn, Hyeong-Joon

doi:10.1007/s12541-014-0628-y

Cited by 12 publications

(2 citation statements)

References 18 publications

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“…To mitigate the adverse effects of initial rubbing and reduce power consumption, the combination of AMBs and GBs appears to enhance the bearing performance (El-Shafei and Dimitri, 2007). It has been verified that hybrid gas-magnetic bearing (HGMB) processes superior performances in regard to system stability, vibration characteristics, operating speed range and frequent starts/stops (Pham and Ahn, 2014; Jang et al , 2014; Jeong and Lee, 2015; Jeong et al , 2017; Jeong and Lee, 2017; Liu et al , 2021b).…”

Section: Introductionmentioning

confidence: 99%

Clearance compatibility and design principle of the single-structured hybrid gas-magnetic bearing

Liu,

Wang,

Feng

2023

ILT

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Purpose This paper aims to study the clearance compatibility of active magnetic bearing (AMB) and gas bearing (GB) to achieve a single-structured hybrid gas-magnetic bearing (HGMB), which uses a single bearing structure to realize both the functions of gas bearing and magnetic bearing. Design/methodology/approach Because the radial clearance size of the AMB is typically ten times larger than that of the GB, radial clearance compatibility of GB and AMB needs to maximize the radial clearance of GB by adjusting structural parameters. Parametric analysis of structural parameters of GB is explored. Furthermore, a general structural design principle based on static analysis, rotordynamic performance and system stability is established for the single-structured HGMB. Findings Load capacity is vastly reduced due to the enlarged radial clearance of the GB. A minimum clearance needs to be ensured by increasing the bearing diameter or width to compensate for the reduced load capacity, yet indirectly raising the bearing load. Increased bearing load is conducive to stability, yet it raises the risk of rotor abrasion. In addition, excessively large bearing diameter leads to system instability, and inappropriate bearing width affects critical speeds. A general structural design principle is established and the designed HGMB–rotor processes optimal performances. Originality/value A single-structured HGMB is proposed to address the urgent demand for high-speed, cryogenic turboexpanders with frequent starts/stops. This design applies a single-bearing structure to realize the characteristics of both GB and AMB, greatly simplifying the implementation, reducing air friction loss and raising critical speeds. This paper provides a fresh perspective on the development of cryogenic turboexpanders for hydrogen liquefaction. It theoretically validates the feasibility and provides a design guide for a single-structured HGMB system.

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Section: Introductionmentioning

confidence: 99%

Clearance compatibility and design principle of the single-structured hybrid gas-magnetic bearing

Liu,

Wang,

Feng

2023

ILT

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“…In the development of active magnetic bearings (AMB), the combination of AMB and air bearings are popular. Jang et al 18 developed the hydrostatic bearing and AMB hybrid system and successfully improved the high-speed stability of the system, but the AMB increased the complexity of the system. The combination of the hydrodynamic bearing and the active magnetic damper was studied by Looser and Kolar.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of a hydrodynamic air bearing with electromagnetic assistance

Jiang

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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An air bearing system with active electromagnetic assistance is proposed, and its dynamic characteristics are numerically analysed. The system is based on herringbone groove hydrodynamic journal bearings. The air bearing system adopts electromagnetic force to assist in lifting the rotor and lowering the lift-off speed of the bearing and adjusting the dynamic stiffness. The characteristics of the bearings are examined using the two-way coupled fluid-structure interaction method for different operating environments. The fluid simulation is performed in ANSYS Fluent and coupled with the motion equations. The fluid-structure interaction analytical model is cross-examined with the published experimental results and is used to analyse the proposed system. The results demonstrate that the lift-off speed is lowered by 46.04% and that the electromagnetic force can compensate for the loss of stiffness at an altitude of 4000 m.

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Single-structured hybrid gas-magnetic bearing and its rotordynamic performance

Liu

Wang

Li³

et al. 2021

Nonlinear Dyn

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Improvement of high-speed stability of an aerostatic bearing-rotor system using an active magnetic bearing

Cited by 12 publications

References 18 publications

Clearance compatibility and design principle of the single-structured hybrid gas-magnetic bearing

Clearance compatibility and design principle of the single-structured hybrid gas-magnetic bearing

Numerical analysis of a hydrodynamic air bearing with electromagnetic assistance

Single-structured hybrid gas-magnetic bearing and its rotordynamic performance

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