By John G. Webster (Editor)
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Extra resources for 62.Vehicular Technology
Equation for an Electric Vehicle Motion. Power delivered to an EV is spent to produce the traction force F increasing the speed (acceleration) and overcoming the resistance W to motion of the train, which is given by Here W is the total force of resistance to motion [N], v is the speed of the EV [km/h], and ao , ao , a2 are approximate coefficients (dependent on the type of EV—usually obtained empirically) for the frictional and GROUND TRANSPORTATION SYSTEMS 17 Fig. 12. Steady-state operation points (traction force F equal to resistance to motion) for different EVs and route profiles W 1 to W 5 .
For an inverter-supplied ac-motor-driven locomotive, the area of operation is limited only by these curves [Fig. 12(b)], so the possible steady-state operating points lie on the curves W 1 to W 5 below the limiting characteristic of the maximum F(v). Equation for an Electric Vehicle Motion. Power delivered to an EV is spent to produce the traction force F increasing the speed (acceleration) and overcoming the resistance W to motion of the train, which is given by Here W is the total force of resistance to motion [N], v is the speed of the EV [km/h], and ao , ao , a2 are approximate coefficients (dependent on the type of EV—usually obtained empirically) for the frictional and GROUND TRANSPORTATION SYSTEMS 17 Fig.
17) OC, composed of one or more messenger wires and suspended on one or more dropper contact wires Compound single or multiple OC (in Fig. 18 is shown a compound single OC with dampers to reduce mechanical oscillations) Basic technical data of an OC are as follows (Fig. 19): • • • System height hk Height of contact wire suspension, h Span distance (between the adjacent support structures), L GROUND TRANSPORTATION SYSTEMS 27 Fig. 18. Compound single overhead catenary with dampers. Fig. 19. Effect of a moving pantograph’s position on an overhead catenary.
62.Vehicular Technology by John G. Webster (Editor)