The Effect of Running Speed and Guideway Irregularity on the Levitation Performance of a Linear HTS Maglev Bearing

Ma, Guangtong; Li, Jing; Ye, Changqing; Yu, Haiyang; Ren, Guanzhou; Wang, Yiyu; Bai, Liangyu

doi:10.1109/tasc.2021.3056636

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…Nevertheless, the maximum temperature rise of the HTS bulk under vertical vibration, lateral vibration, and coupling vibration are 77.072 K, 77.074 K, and 77.076 K respectively, which is much lower than the critical temperature of 92 K that will make HTS bulks quench. This indicates that the temperature rise inside the HTS bulk has little influence on the dynamic stability at high speed, which is consistent with the conclusions in [28,43], which means that the HTS bulk shows good thermal stability at high speed.…”

Section: Temperature Variationsupporting

confidence: 87%

“…The irregularities of the PMG that cause the vibration of the levitator include the geometrical irregularity caused by guideway installation errors, surface defects, etc and spatial magnetic field irregularity caused by performance differences of permanent magnets. Yang et al [28] has studied the vertical random vibration of the HTS maglev system under guideway irregularity. The excitation of the guideway is often coupled vertically and laterally, and lateral vibration will lead to change of the levitation force of the HTS bulk and cause vertical vibration at the same time.…”

Section: Vertical and Lateral Guideway Random Irregularitymentioning

confidence: 99%

“…Sass et al [23] established a new 2D model to simulate the levitation force between a single PM and an HTS bulk by the H method. Yang et al [27,28] studied the vertical vibration characteristics and thermal effects under the guideway irregularity of an HTS maglev bearing at high speed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Huang

Ye²,

Ke³

et al. 2023

Supercond. Sci. Technol.

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High-temperature superconductor (HTS) maglev system shows a significant potential to be applied to high-speed rail transportation based on its passive stable levitation owning to the coupling between the HTS bulks and permanent magnet guideway (PMG). And as one of the key factors to guarantee the safe and stable operation of HTS maglev, the dynamic characteristics of the HTS bulks reflecting the operation performance of HTS maglev system under high-speed running conditions should be focused on. Therefore, this paper, based on H-formulation, established a finite element model of an HTS-PMG system, and assessed its feasibility by experiments. Moreover, the random free vibration of the HTS bulk caused by guideway random irregularity at high speed is also studied by this validated model. The random vibration characteristics and temperature variation of the HTS bulk at three high speeds (600 km/h, 800 km/h, and 1000 km/h) under vertical vibration, lateral vibration, and vertical-lateral coupling vibration, respectively, are compared. The results show that at high speed, vertical vibration can only cause the fluctuation of levitation height, while lateral vibration and vertical-lateral coupled vibration will affect both lateral offset and levitation height. Compared with the mere vertical or lateral vibration mode, the levitation height attenuation and temperature rise of the coupling vibration mode is greater due to more energy loss caused by magnetic flux motion, but it can be aid in the suppression of the vibration in the vertical and lateral direction. The increase of velocity intensifies the vibration strength of the HTS bulk and increases the fluctuation of the levitation height, lateral offset, and temperature rise. However, the vibration at a certain high speed causes a limited temperature rise and thus a limited influence on the bulk performance, and the HTS bulk is still in the safe operating range at a maximum speed of 1000 km/h. These conclusions are anticipated to provide some references for the future high-speed application of the HTS maglev system.

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Section: Temperature Variationsupporting

confidence: 87%

Section: Vertical and Lateral Guideway Random Irregularitymentioning

confidence: 99%

See 1 more Smart Citation

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Huang

Ye²,

Ke³

et al. 2023

Supercond. Sci. Technol.

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show abstract

“…In fact, pinning of flux lines mainly affects the hysteretic magnetic force, and thermal depinning of flux lines is related to the force relaxation and levitation drift. Motivated by these experiments, many numerical studies have been performed to understand the effect of flux motion on the vibration and drift phenomena for maglevs in recent years [24][25][26][27][28][29][30][31][32][33]. The dynamics with two degrees of freedom, including levitation drift and resonance behavior, and the strategies to improve the dynamic levitation performance were studied using a 2D model based on the A − V formulation in [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have developed a 2D thermal-electromagnetic model in terms of the A − V formulation to analyze the thermal and rotational effects on the dynamics, as well as the levitation force jumping phenomenon caused by thermomagnetic instability [28,29]. Based on the H formulation, Deng et al and Yang et al have built a 3D electromagnetic-thermal model to analyze the vibration behavior of maglevs in the vertical and lateral directions caused by guideway random irregularity [30][31][32][33]. These works mainly focus on the influence of system defects on the dynamic characteristics during operation.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of 3D superconducting maglevs with six degrees of freedom: dependence on magnetization strategy and disturbance type

Huang,

Diao,

Liu

et al. 2023

Supercond. Sci. Technol.

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Based on the heat diffusion equation, Maxwell’s equations, and translational and rotational dynamic equations, we establish and theoretically validate an electromagnetic-thermal-mechanical coupling model to analyze the levitation performance during normal operation and the nonlinear dynamic behavior under disturbance for 3D maglev systems composed of a six-degree-of-freedom bulk superconductor (SC) and a Halbach-type guideway of permanent magnets (PMs) with different magnetization strategies and different types of disturbances, as well as the change rules of magnetic force and torque during translational or rotational cycle movement. In order to ensure the system security, we propose a generalized electromagnetic restoring force model to theoretically analyze the stability of the SC moving along the directions of various degrees of freedom. The results show that after being disturbed, the SC vibrates along the direction of each degree of freedom, and the vibration center, i.e. equilibrium position, will drift along each vibration direction. With time increasing, the equilibrium position will appear periodically on both sides of the working position. Compared to zero-field cooling magnetization, field cooling magnetization enables the SC to trap more flux in its interior to alleviate the drift phenomenon and reduce the energy loss. This advantage can be further enhanced by adding an extra step of preloading treatment. For the lateral motion, the system has one stable focus point and two unstable saddle points. Whether the system at these saddle points is stable depends on the direction of disturbance-induced velocity. For the rotational motion, the system has only one stable focus point, which means that regardless of the type of disturbance, the SC will finally come back to its stable equilibrium position. Besides, the stability is related to the axis around which the SC rotates, and rotating around the longitudinal axis is more likely to generate larger magnetic force, torque and local temperature rise. Either field cooling magnetization or preloading treatment can effectively improve system stability.

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RBF-ARX model-based trust region nonlinear model predictive control and its application on magnetic levitation ball system

Peng,

Kang

2024

Nonlinear Dyn

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The Effect of Running Speed and Guideway Irregularity on the Levitation Performance of a Linear HTS Maglev Bearing

Cited by 8 publications

References 19 publications

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Nonlinear dynamics of 3D superconducting maglevs with six degrees of freedom: dependence on magnetization strategy and disturbance type

RBF-ARX model-based trust region nonlinear model predictive control and its application on magnetic levitation ball system

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