Technology Analysis in Interregional Goods MovementInstitute of Transportation Studies, University of California, 1984 - Freight and freightage - 46 pages |
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acceleration air resistance average speed center of rotation centrifugal force contact area cm contact area cm/sec Contact Pressures Costa Rica D₁ developing countries developing region differential area Fnos force required Frif Frrof fuel efficiency fundamental physical given vehicle illustrate the concept illustrated in Figure inside front wheel Institute of Transportation kg-force Lateral Plane longitudinal axis longitudinal direction Longitudinal Plane meters normal force normal pressure number of wheels overcome rolling resistance powered wheel radians reduce way costs required to overcome road surface road-wheel contact area side force acting simple model simple vehicle performance slip energy loss steering angle superelevation tangent technological tradeoffs text Figure tions total side force tractive effort tractive forces tractive friction curve tradeoffs of interest transportation investments Transportation Studies transportation technology truck tire unpowered V₁ vehicle performance model vehicle weight Velocity m/sec vertical vertical deflection Wheel diameters wheel-road contact area wheel-road interface wheelbase length