DYNAMICS OF FLEXIBLY SUPPORTED TUNNELS AND OTHER ROADBEDS

Vehicles supported by flexible roadbeds can exhibit violent vibrations near a particular critical velocity. This situation is idealized to a concentrated load traveling on a Bernoulli-Euler beam which rests on an elastic foundation. A floating tunnel design of the type proposed by Edwards is so modeled, and found to have a critical velocity of about 262 miles per hour and nearly negligible damping. Avoidance of excessive vibration by rapidly accelerating or deceleration through the critical frequency is studied with preliminary results. The tentative indication on the particular example is that an impractically high acceleration would be necessary unless changes are made. (Author)

• Corporate Authors:

  Massachusetts Institute of Technology

  Engineering Projects Laboratory
  Cambridge, MA  United States 
• Authors:
  • Brown, F T
• Publication Date: 1966-11-1

Media Info

• Pagination: 31 p.

Subject/Index Terms

• TRT Terms: Guideways; Intelligent transportation systems; Pneumatic conveyors; Tubing; Tunnels; Vehicle dynamics
• Old TRIS Terms: Advanced systems; Tube systems; Tube vehicles
• Subject Areas: Bridges and other structures; Operations and Traffic Management; Railroads; Terminals and Facilities;

Filing Info

• Accession Number: 00039067
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: DSR-76107-1
• Contract Numbers: C-85-65t
• Files: TRIS
• Created Date: Nov 24 1973 12:00AM