Technical Reports

Technical Feasibility of Magnetic Levitation as a Suspension System for High-Speed Ground Transportation Vehicles- Volume II: Appendix

  • 01
  • Feb
  • 1972
AUTHOR: John R. Reitz, Robert H. Borcherts, L. Craig Davis, Dennis F. Wilkie
SUBJECT: Track/Train Interactions
KEYWORDS: Magnetic Levitation, Magnetic Lift and Drag Forces, Vehicle Dynamics, Ride Quality, Superconducting Magnets
ABSTRACT: This report examines the technical feasibility of magnetic levitation as a suspension system for high-speed ground transportation vehicles in the 300 mph cruise speed range. Of the various magnetic suspensions which have been proposed only one appears to provide all of the desired features: good ride quality, moderate guideway tolerance, basic stability, and moderate drag forces. This is the high clearance (~10 inch vehicle-track clearance) suspension using superconducting magnets in the vehicle and a conducting, nonmagnetic, continuous guideway. If a high tolerance track can be laid and maintained, then the low clearance suspension using magnetic attraction forces (being developed by Messerschmitt-Bolkow-Blohm and Kraus-Maffei in Germany) becomes a strong contender. Analyses of ride quality show the importance of a high clearance suspension in smoothing track irregularities without allowing the vehicle to come into contact with the track. .All magnetic suspensions are poorly damped relative to vehicle perturbation, so some type of active or passive control is necessary. Methods for increasing passive damping have been explored in the present report. A preliminary design for a vehicle magnet using a superconducting coil is given.