Thermal stability of maglev SCMs with vibration-induced disturbances

E. A. Scholle, Justin Schwartz

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In magnetic levitation (Maglev) systems, the interaction between the superconducting magnets (SCMs) and the discrete ground coils causes electromagnetic and mechanical vibrations. These disturbances can limit the performance of the Maglev. We examine how the electromagnetic oscillations are translated into mechanical vibrations and the subsequent effects on thermal stability. Dynamic circuit theory is used to determine the harmonic forces on the SCM. The vibrational response of the SCM to these forces is analyzed via normal mode calculations. The energy dissipation within the conductor due to hysteresis damping is then determined, forming the input to a two-dimensional thermal stability analysis. This paper focuses on the extension of the thermal stability model from one to two dimensions and results obtained from modeling the performance of MLU002. Results of this analysis show how variations in mechanical properties of the conductor affect the stability of MLU002 as a function of velocity. It was found that vibrational resonance occurs at certain combinations of Young's modulus and vehicle velocity, quenching the magnets. The ability to predict the velocity at which resonances occur allows future Maglev designs to avoid such quenches by shifting the critical velocity above that intended for operation.

Original languageEnglish (US)
Pages (from-to)169-174
Number of pages6
JournalApplied Superconductivity
Volume3
Issue number1-3
DOIs
StatePublished - Jan 1 1995

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Superconducting magnets
levitation
superconducting magnets
Magnetic levitation
Thermodynamic stability
thermal stability
disturbances
vibration
conductors
electromagnetism
dimensional stability
critical velocity
Dimensional stability
modulus of elasticity
Circuit theory
vehicles
magnets
coils
energy dissipation
damping

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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title = "Thermal stability of maglev SCMs with vibration-induced disturbances",
abstract = "In magnetic levitation (Maglev) systems, the interaction between the superconducting magnets (SCMs) and the discrete ground coils causes electromagnetic and mechanical vibrations. These disturbances can limit the performance of the Maglev. We examine how the electromagnetic oscillations are translated into mechanical vibrations and the subsequent effects on thermal stability. Dynamic circuit theory is used to determine the harmonic forces on the SCM. The vibrational response of the SCM to these forces is analyzed via normal mode calculations. The energy dissipation within the conductor due to hysteresis damping is then determined, forming the input to a two-dimensional thermal stability analysis. This paper focuses on the extension of the thermal stability model from one to two dimensions and results obtained from modeling the performance of MLU002. Results of this analysis show how variations in mechanical properties of the conductor affect the stability of MLU002 as a function of velocity. It was found that vibrational resonance occurs at certain combinations of Young's modulus and vehicle velocity, quenching the magnets. The ability to predict the velocity at which resonances occur allows future Maglev designs to avoid such quenches by shifting the critical velocity above that intended for operation.",
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Thermal stability of maglev SCMs with vibration-induced disturbances. / Scholle, E. A.; Schwartz, Justin.

In: Applied Superconductivity, Vol. 3, No. 1-3, 01.01.1995, p. 169-174.

Research output: Contribution to journalArticle

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AU - Schwartz, Justin

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AB - In magnetic levitation (Maglev) systems, the interaction between the superconducting magnets (SCMs) and the discrete ground coils causes electromagnetic and mechanical vibrations. These disturbances can limit the performance of the Maglev. We examine how the electromagnetic oscillations are translated into mechanical vibrations and the subsequent effects on thermal stability. Dynamic circuit theory is used to determine the harmonic forces on the SCM. The vibrational response of the SCM to these forces is analyzed via normal mode calculations. The energy dissipation within the conductor due to hysteresis damping is then determined, forming the input to a two-dimensional thermal stability analysis. This paper focuses on the extension of the thermal stability model from one to two dimensions and results obtained from modeling the performance of MLU002. Results of this analysis show how variations in mechanical properties of the conductor affect the stability of MLU002 as a function of velocity. It was found that vibrational resonance occurs at certain combinations of Young's modulus and vehicle velocity, quenching the magnets. The ability to predict the velocity at which resonances occur allows future Maglev designs to avoid such quenches by shifting the critical velocity above that intended for operation.

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