Optimum dual-mode system performance and efficiency require that the vehicle propulsion system be properly sized and rated. In addition to the general requirements of speed, acceleration, and environmental factors, specific requirements such as velocity profile and vehicle characteristics must be established to obtain complete definition. Mission-dependent torque-time profiles must be generated from these combined requirements. Load lines can then be established, and the propulsion system can be sized in the conventional way. In choosing a propulsion system, one must consider both the on- and off-guideway performance requirements. In general, and acceleration and cruise thrust requirements are not compatible for each of the operating modes and, therefore, would lead to independent sizing criteria. The preferred approach is to develop an initial site-independent design based on worst case acceleration and speed-maintaining requirements as prescribed by the design guidelines. This provides adequate propulsion data for development of the mission characteristics including the site-dependent velocity and grade profiles. The propulsion design is then iterated, making use of the profiles to generate a torquetime profile. This profile provides short- term and continuous performance requirements that can be compared to short- and long-term ratings of the propulsion system. When the short-term ratings from specific regimes of operation size the propulsion system, consideration should be given to modification of the mission profile within the limits of the design guidelins. Once the mission profile has been fixed, propulsion design proceeds in a conventional way. /Author/

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    • This paper appears in Dual Mode Transportation, which is a publication containing the proceedings of a conference conducted by the Transportation Research Board, May 29-31, 1974. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Corporate Authors:

    Transportation Research Board (TRB)

    Washington, DC   
  • Authors:
    • Raposa, Frank L
    • Spenny, C H
    • Abbas, J D
  • Conference:
  • Publication Date: 1976

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  • Accession Number: 00149274
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Mar 30 1977 12:00AM