In: Mechanical Engineering
An electric vehicle has the following parameter values:
mv = 800kg
CD =0.2
Af = 2.2 m2
ρ = 1.18 kg/m
f r = 0.008 + 0.6×10-6×v2 (v: vehicle speed in m/s)
The vehicle is on level road. It accelerates from 0 to 100 km/h in 10s such that its velocity profile is given by v (t) =0.29055t2 for 0 < t < 10s. (The mass factor is assumed unit)
a. Define the traction force expression Ft
b. Sketch Ft versus time
c. Define the instantaneous traction power expression
d. Calculate the energy consumed during the acceleration (0 < t < 10s)
e. Calculate the energy lost for non-conservative forces (wind and rolling resistance)
f. Find the change in kinetic energy and the change in tractive energy during acceleration.