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Title: Magnetic damping forces in figure-eight-shaped null-flux coil suspension systems

Abstract

This paper discusses magnetic damping forces in figure-eight-shaped null-flux coil suspension systems, focusing on the Holloman maglev rocket system. The paper also discusses simulating the damping plate, which is attached to the superconducting magnet by two short-circuited loop coils in the guideway. Closed-form formulas for the magnetic damping coefficient as functions of heave-and-sway displacements are derived by using a dynamic circuit model. These formulas are useful for dynamic stability studies.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
Department of Defense, Washington, DC (United States)
OSTI Identifier:
508130
Report Number(s):
ANL/ES/CP-91498; CONF-970468-3
ON: DE97007031; TRN: 97:004702
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 1997 IEEE international magnetics conference (Intermag `97), New Orleans, LA (United States), 1-4 Apr 1997; Other Information: PBD: 1997
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; LEVITATION; STABILITY; DAMPING; ROCKETS; MAGNETIC FIELDS

Citation Formats

He, Jianliang, and Coffey, H. Magnetic damping forces in figure-eight-shaped null-flux coil suspension systems. United States: N. p., 1997. Web.
He, Jianliang, & Coffey, H. Magnetic damping forces in figure-eight-shaped null-flux coil suspension systems. United States.
He, Jianliang, and Coffey, H. 1997. "Magnetic damping forces in figure-eight-shaped null-flux coil suspension systems". United States. doi:. https://www.osti.gov/servlets/purl/508130.
@article{osti_508130,
title = {Magnetic damping forces in figure-eight-shaped null-flux coil suspension systems},
author = {He, Jianliang and Coffey, H.},
abstractNote = {This paper discusses magnetic damping forces in figure-eight-shaped null-flux coil suspension systems, focusing on the Holloman maglev rocket system. The paper also discusses simulating the damping plate, which is attached to the superconducting magnet by two short-circuited loop coils in the guideway. Closed-form formulas for the magnetic damping coefficient as functions of heave-and-sway displacements are derived by using a dynamic circuit model. These formulas are useful for dynamic stability studies.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1997,
month = 8
}

Conference:
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  • This paper analyzes the cross-connected figure-eight null-flux coil suspension system for maglev vehicles on the basis of dynamic circuit theory. The equivalent circuits and general magnetic force expressions for the system are developed. Simple analytical formulas for the magnetic force partitions on the basis of harmonic approximation are presented, and numerical results are also included.
  • This paper analyzes the cross-connected figure-eight null-flux coil suspension system for maglev vehicles on the basis of dynamic circuit theory. The equivalent circuits and general magnetic force expressions for the system are developed. Simple analytical formulas for the magnetic force partitions on the basis of harmonic approximation are presented, and numerical results are also included.
  • This report discusses the computer modeling and experimental verification of the magnetic forces associated with a figure-eight-shaped null-flux coil suspension system. A set of computer codes called COILGDWY, were developed on the basis of the dynamic circuit model and verified by means of a laboratory model. The experimental verification was conducted with a rotating PVC drum, the surface of which held various types of figure-eight-shaped null-flux coils that interacted with a stationary permanent magnet. The transient and dynamic magnetic forces between the stationary magnet and the rotating conducting coils were measured and compared with results obtained from the computer model.more » Good agreement between the experimental results and computer simulations was obtained. The computer model can also be used to calculate magnetic forces in a large-scale magnetic-levitation system.« less
  • Two figure-eight-shaped coils for electrodynamic suspension (EDS) magnetic levitation (MAGLEV) systems without cross-connection are proposed and analyzed. The guideway coils are positioned under the MAGLEV vehicle; they are parallel to the horizontal plane. The interaction of a magnetic module on the vehicle, composed of three or four superconducting (SC) coils, with a guideway module, comprised of two figure-eight coils, is studied by means of the dynamic circuit theory. The currents in the SC coils are supposed to be constant in time while they move as a rigid body, with a constant velocity. Some results are presented and compared with thosemore » for a standard side-wall cross-connected system.« less
  • This paper discusses the magnetic force computations in a null-flux suspension system using dynamic circuit theory. A computer simulation model that can be used to compute magnetic forces and predict the system performance is developed on the basis of dynamic circuit theory. Numerical examples are presented to demonstrate the application of the model. The performance of the null-flux suspension system is simulated and discussed. 8 refs.