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

Liu, Qing; Wang, Li; Li, Yuanyuan; Lei, Gang

doi:10.1007/s11071-021-06295-5

Cited by 7 publications

(6 citation statements)

References 23 publications

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“…The closed magnetic pole, which consists of both magnetic and nonmagnetic material, directly acts as the bushing of the self-acting GB. Therefore, foil structures are eliminated, leading to a more compact design and more efficient AMB (Liu et al , 2021a).…”

Section: Single-structured Hybrid Gas-magnetic Bearingmentioning

confidence: 99%

“…The main numerical methods applied are finite differential method and finite element method. The mathematical modeling and numerical analysis methods of the HGMB–rotor system are based on the reported work (Liu et al , 2021a).…”

Section: Clearance Compatibility Of Single-structured Hybrid Gas-magn...mentioning

confidence: 99%

“…To rectify these problems, Liu et al (2021aLiu et al ( , 2021b proposed a concept of single-structured HGMB, and the superiority of its rotordynamic performances has been proved. The singlestructured HGMB integrates the bearing characteristics of GB and AMB with only a single bearing structure, reducing manufacturing difficulty and eliminating foil structures or external pressurization.…”

Section: Introductionmentioning

confidence: 99%

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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: Single-structured Hybrid Gas-magnetic Bearingmentioning

confidence: 99%

Section: Clearance Compatibility Of Single-structured Hybrid Gas-magn...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Liu,

Wang,

Feng

2023

ILT

Self Cite

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“…One of the most significant parameters in predicting the treatment of the rotor while passing the critical speed of the system is to consider nonlinear terms of inertia, including eccentricity. So that, in all the works mentioned such as (Afshari and Irani Rahaghi, 2018; Fu et al, 2020; Guan et al, 2020; Jia et al, 2020; Liu et al, 2021; Mahmoudi et al, 2016; Navazi and Hojjati, 2017; Sghaier et al, 2019; Quinn, 2009; Torabi et al, 2017; Wu et al, 2019), this nonlinear term has been neglected.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear modeling of a misaligned rotor under non-stationary operating conditions

Rokn-Abadi

Amirzadegan

Firouz-Abadi

et al. 2023

Journal of Vibration and Control

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In this study, a novel model is developed to investigate the angular acceleration of the nonlinear misaligned rotor passing through the critical speeds under non-stationary operating conditions. The concerned rotor is modeled elastic with the effects of nonlinear inertia terms and flexible bearing. Nonlinear equations of motion are derived using the Lagrange method and solved with the finite element method. Effects of parameters such as shaft eccentricity, damping, and stiffness of the supports on the increase in the rotor angular speed passing through the critical speed are considered. The obtained results indicate that a small amount of eccentricity prevents exceeding the elastic critical speed of the rotor. According to the results, if the support parameters are not selected properly, the rotor will not even be able to pass its rigid critical speed.

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“…Based on the rolling bearing rotor system, many scholars have studied the factors that affect the operation of rotor system considering Alford force. However, in recent years, with the application and development of electromagnetic technology, permanent magnet generator [8][9][10], maglev planar motor [11][12][13], and magnetic bearings [14][15][16] have been widely concerned because of its advantages of no friction, high speed, and long life. In addition, active magnetic bearings (AMBs) that can be actively controlled has have been successfully applied in many industrial products [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nonlinear Characteristics and the Factors Affecting the Operation of the Active Magnetic Bearings Rotor System Considering Alford Force

Zhang

Zhou²,

Han³

et al. 2022

ACES Journal

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Based on a test rig supported by active magnetic bearings (AMBs), this paper focuses on the study of the nonlinear dynamic characteristics and the factors affecting the operation of a rotor system under the coupling of magnetic bearing force and Alford force. In order to solve the nonlinear dynamic response of rotor system, a dynamic equation of the rotor which introduces Alford force and the electromagnetic force of the AMBs controlled by PID is established. By changing the control parameters (kPP and kDD), operation parameters (rotational speed), and structural parameters (clearance between impeller and volute), the equation is solved by using Runge−-Kutta method. The results show that the rotor system exhibits complex nonlinear dynamic characteristics under the coupling action of Alford force and magnetic bearing force. The rotor system appears different dynamic behaviors such as single period, multi multi-period, and quasi quasi-period when changing the control parameters. Among all the control parameters, adjusting kDD is more effective to ensure system stability. The amplitude of rotor increases from 8.2 μμm to 11.9 μμm with the increase of speed from 6000 rpm to 10,000 rpm, while that decreases from 9.6 μμm to 8.2 μμm with the increase of clearance between impeller and volute from 1mm to 4 mm. Therefore, under the influence of Alford force, apart from the control parameters, the operation parameters and structural parameters of magnetic bearings also affect the operation of the rotor system supported by the AMBs.

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

Cited by 7 publications

References 23 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

Nonlinear modeling of a misaligned rotor under non-stationary operating conditions

Analysis of Nonlinear Characteristics and the Factors Affecting the Operation of the Active Magnetic Bearings Rotor System Considering Alford Force

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