70 or 80 percent of the traction energy employed in the operation of metropolitan and suburban railways on lines with the stops arranged at short intervals are used for the kinetic energy of the vehicles. If at all, this energy is recuperated only at a rate of approximately 30 percent. Gravity traction allows the kinetic energy of the vehicles to be recuperated at a rate of about 90 percent during deceleration, which would decrease the overall energy input by 63 to 72 percent. However, this requires the line to be arranged uphill and downhill, and a traction system not based on the interaction of forces between a wheel and a rail (e.g., linear induction motors) might be needed. In addition, it may be possible, by means of gravity traction, to attain high acceleration levels wich will not be felt by the passengers and will not be detrimental to cargo. The result would be high average speeds, even at short intervals between stops, without requiring more traction power, and perhaps without the need for active traction (passive vehicle). A relationship is established between the parameters of the trackway and the change of the vertical and horizontal acceleration values as a function of time. The sea sickness range and excessively high changes in acceleration as a function of time can be excluded by the proper choice of the trackway parameters.
Possibilities of Energy Recuperation by Gravity Traction in Public Transit Systems
1975
50 pages
Report
No indication
English
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