INTEGRATED ANALYSIS OF VERTICAL ALIGNMENTS AND SPEED PROFILES FOR RAIL TRANSIT ROUTES
Schonfeld, Paul M
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Frequent accelerations and decelerations for rail transit trains adversely affect in the major performance measures of travel time, tractive energy consumption and braking wear between stations. A dipped vertical alignment between rail transit stations provides trains some added advantages from gravity in accelerating as well as in decelerating. A deterministic simulation model based on basic kinematics and resistance relations has been developed to compute train motions and energy consumption on specified vertical alignments. A baseline case study and the sensitivity of results to parameter changes are analyzed. Vertical alignments and operating characteristics such as speeds and coasting distances are jointly optimized. Powell&#8217;s Method is used for numerically optimizing total costs and other objective functions. Without speed constraints, the optimized total cost savings exceed 6.5%. The optimized alignment depths and total cost savings decrease as speeds are constrained to lower values. The methods developed here may significantly improve rail transit systems.