Experimental Research on Rail Vehicle Safety Using Dynamically Scaled Models

摘要

The following activities have been completed during the first quarter of the program year: a) Design study of similitude parameters to determine model scale to be used over the course of the program. The selected track gauge is 12 inches, or a geometric scale factor of lambda approx. 0.2. b) Experimental measurement of lateral and tangential creep characteristics of LEXAN wheels and rails using a roller rig. LEXAN has been selected as a substitute for steel to achieve dynamic similitude in the critical creep forces. Comparisons of test data with theoretical models shows that LEXAN exactly reproduces creep forces in model scale. c) Design of the track support structure and rail system. Static and dynamic deflections were analyzed in detail; the stiffness, cost of fabrication, and availability of standard section shapes were included in a tradeoff analysis. Construction of the track structure has been initiated. d) Design of wheelset carriage, linkage, and instrumentation systems. Various experimental configurations were investigated considering rail, wheelset, and contact plane coordinate systems, optional locations for force application, and allowed degrees-of-freedom. e) Directory listing of potential users of the research results. A list of 29 potential users in the railroad technical community has been submitted to DOT for comment or addition. A detailed description of Items a) through e) is given. Also included are a work plan, assignment of personnel activities, and outline of activities for the second quarter of the program.