DYNAMICS OF A MODEL VEHICLE RUNNING ON AN IMPERFECT ELASTIC TRACK
THEORETICAL ANALYSES OF BOTH LOGITUDINAL AND LATERAL DYNAMICS OF A SCALED MODEL SUBWAY VEHICLE WERE PERFORMED TO IDENTIFY DESIGN PARAMETERS AND THE RELATIONSHIPS AMONG DIFFERENT SYSTEM COMPONENTS AND CONDITIONS. THE LONGITUDINAL ANALYSES ASSUMED BOTH RIGID AND ELASTIC TRACKAGE TO ESTIMATE CRITICAL SPEEDS. EFFECTS SUCH AS THE ECCENTRICITY OF THE WHEEL, TRACK IMPERFECTIONS, CURVATURE IN THE TRACK PLANE, AND THE COUPLING BETWEEN ROTARY AND TRANSLATION VIBRATION DUE TO ASYMMETRY OF THE CENTER OF GRAVITY WERE CONSIDERED IN THE ANALYSIS. LATERAL DYNAMICS WERE ALSO INVESTIGATED, WITH PARTICULAR ATTENTION FOCUSED UPON BOTH WHEEL SHIMMY, WHICH INVOLVED SOLID AND VISCOUS FRICTION, AND THE STABILITY OF THE "SNAKE" TYPE MOTION OF THE VEHICLE ON A RIGID IMPERFECT TRACK. ALL CRITICAL SPEEDS IN THE DYBAMIC ANALYSIS EXCEEDED THE MAXIMUM REQUIRED FOR NORMAL OPERATIONS OF SUBWAY VEHICLES (65+MILES PER HOUR). /UMTA/
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Corporate Authors:
Developmental Sciences, Incorporated
Aerospace Technology Division
City of Industry, CA United States - Publication Date: 1971-2
Subject/Index Terms
- TRT Terms: Curvature; Dynamic tests; Eccentricity; Elasticity (Mechanics); Overturning; Railroad tracks; Rapid transit cars; Speed; Vehicle design; Vibration; Wheels
- Uncontrolled Terms: Model tests
- Subject Areas: Design; Highways; Railroads; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00223935
- Record Type: Publication
- Source Agency: Urban Mass Transportation Administration
- Files: TRIS, USDOT
- Created Date: Oct 23 1972 12:00AM