Accession Number : ADA132119

Title :   Experimental Research on Rail Vehicle Safety Using Dynamically Scaled Models.

Descriptive Note : Quarterly progress rept. no. 2, 25 Sep-25 Dec 76,

Corporate Author : PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES

Personal Author(s) : Sweet,Larry M

PDF Url : ADA132119

Report Date : Jan 1976

Pagination or Media Count : 29

Abstract : The analytical and experimental design phases of the program are completed. The design of the experiment consists of the following elements: (a) Design study of study of similitude parameters to determine mkodel scale to be used over the course of the program; (b) Design of the track support structure and rail system; (c) Analysis to random irregularities in track alignment, elevation, and gauge, to determine necessary construction tolerances; (d) Detailed design of wheelset, idler carriage, linkage, and instrumentation systems; (e) Computer simulation of experiment to determine full range of measured variables. The 800-foot track structure has been completed, with piers secured to the concrete slab floor. The pier heights have been coarse adjusted to provide an approximately level surface for subsequent construction. The LEXAN track rails have been machined to the standard new rail profile. A small roller rig used for calibration experiments of tangential, lateral, and spin creep was completed. Experimental measurements of lateral and tangential creep forces using LEXAN wheels on the roller rig showed that the contact forces are exactly reproduced in scale. Agreement with theory was demonstrated using scaled values for shear modulus.

Descriptors :   *Railroad tracks, *Wheels, Railroad cars, Carriages, Safety, Motion, Loads(Forces), Dynamics, Alignment, Measurement, Model tests, Scale models

Subject Categories : Surface Transportation and Equipment
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE