ARCHIMEDEAN-SCREW ACCELERATORS FOR AUTOMATIC TRANSPORTATION

CONTINUOUS-FLOW AUTOMATIC TRANSIT SYSTEMS KNOWN AS PERSONAL RAPID TRANSIT OR PEOPLE MOVERS REQUIRE AUTOMATIC CONTROL OF ACCELERATION AND MERGING OF INDIVIDAUL VEHICLES INTO THE MAINLINE. THIS REPORT SUMMARIZES WORK DONE IN DEVELOPMENT OF A MECHANICAL ACCELERATOR WHICH PERFORMS THIS TASK. A VARIABLE-PITCH SCREW THE LENGTH OF THE ACCELERATION LANE WAS CHOSEN AS THE MOST PRACTICAL METHOD. THE VARIOUS GEOMETRIC PARAMETERS AND RELATIONSHIPS WERE STUDIED, INCLUDING FORCE LEVELS AND EFFICIENCIES. CONSTRAINTS ON THE DESIGN ARE ALSO LISTED. A SCREW WAS SPECIFICALLY DESIGNED FOR A MODEL OF THE PROPOSED PALLETED AUTOMATIC TRANSPORTATION SYSTEM, OBSERVING AND PASSENGER-COMFORT LIMITS ON JERK AND ACCELERATION. TWO SCREWS, ONE OF FABRICATED CONSTRUCTION AND THE OTHER MACHINED, WERE BUILT AND TESTED. BOTH SUCCESSFULLY ACCELERATED PALLETS TO A FINAL VELOCITY OF FOUR FEET PER SECOND, AND THE MACHINED SCREW PERFORMED QUITE SMOOTHLY. A METHOD OF SWITCHING PALLETS IS ALSO DESCRIBED. ILLUSTRATIONS AND A LIST OF REFERENCES IS INCLUDED.

  • Supplemental Notes:
    • Contract MA-11-0005 Rept No UMTA-MA-11-000572-4
  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Mechanical Engineering
    Cambridge, MA  United States  02139
  • Authors:
    • Valaas, A M
  • Publication Date: 1972-5

Media Info

  • Pagination: 82 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00223946
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Report/Paper Numbers: Final Rept
  • Files: TRIS, USDOT
  • Created Date: Apr 20 1974 12:00AM