Problem 1. The vehicle is at rest on a blacktop road that is flat and dry...
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Problem 1. The vehicle is at rest on a blacktop road that is flat and dry (μ = 0.80). The torque curve of the vehicle has been measured and can be approximated as: RPM ≤ 4800 4800 RPM ≤ 5800 T(RPM) = (Tmax Pmax W 9.455 x 107 w² RPM > 5800 a) Sketch the motor torque and power graphs. What is the maximum speed of the vehicle and what is the motor torque and power at the max speed? (15 pt) b) The vehicle accelerates from rest to 60 mph as hard as possible. Calculate the power train and traction limited accelerations. What limits the acceleration performance? (10p) c) In what time would the vehicle reach 60 mph and at what distance from the start (25p). Mid Range Tesla Model 3 specs: Vehicle dimensions and weight: Curb Weight (lb): 3686 Gross Weight (lb): 4687 Front / Rear Axle Weights (lb): 1732/1954 Center of Mass Height (in): 18.5 Ground Clearance: 5.5 in Wheelbase (in): 113.2 Body width (in): 72.8 Body height (in): 56.8 Body length (in): 184.8 Front wheel assembly weight (lb): 50 Rear wheel assembly weight(lb): 42 Track (in): 62.2 Motor: Rear wheel drive Switched reluctance motor (SRM) Max Power: 283 HP @ 4800 RPM Max Torque (ft-lb): 310 Max RPM: 15,800 Transmission Gear Ratios: Final drive axle ratio: 1:9 ¹tf = 0.92 Aerodynamics: Frontal area filling factor: 0.8 CD = 0.23 CL = 0.38 ACs = 0.055/deg ACPM = 0.150/deg ACYM = 0.0018/deg ACRM = 0.030/deg Tires: Tires - P235/45R18 radial ply Tire pressure: 42 psi Suspension: Independent front, independent rear with locking differential Front Roll Stiffness (ft-lb/deg): 1500 Rear Roll Stiffness (ft-lb/deg): 2100 Spring stiffness (F/R lb/in): 150/200 Damping coefficient (F/R lb s/ft): 200/220 Roll axis height: 12 in Problem 1. The vehicle is at rest on a blacktop road that is flat and dry (μ = 0.80). The torque curve of the vehicle has been measured and can be approximated as: RPM ≤ 4800 4800 RPM ≤ 5800 T(RPM) = (Tmax Pmax W 9.455 x 107 w² RPM > 5800 a) Sketch the motor torque and power graphs. What is the maximum speed of the vehicle and what is the motor torque and power at the max speed? (15 pt) b) The vehicle accelerates from rest to 60 mph as hard as possible. Calculate the power train and traction limited accelerations. What limits the acceleration performance? (10p) c) In what time would the vehicle reach 60 mph and at what distance from the start (25p). Mid Range Tesla Model 3 specs: Vehicle dimensions and weight: Curb Weight (lb): 3686 Gross Weight (lb): 4687 Front / Rear Axle Weights (lb): 1732/1954 Center of Mass Height (in): 18.5 Ground Clearance: 5.5 in Wheelbase (in): 113.2 Body width (in): 72.8 Body height (in): 56.8 Body length (in): 184.8 Front wheel assembly weight (lb): 50 Rear wheel assembly weight(lb): 42 Track (in): 62.2 Motor: Rear wheel drive Switched reluctance motor (SRM) Max Power: 283 HP @ 4800 RPM Max Torque (ft-lb): 310 Max RPM: 15,800 Transmission Gear Ratios: Final drive axle ratio: 1:9 ¹tf = 0.92 Aerodynamics: Frontal area filling factor: 0.8 CD = 0.23 CL = 0.38 ACs = 0.055/deg ACPM = 0.150/deg ACYM = 0.0018/deg ACRM = 0.030/deg Tires: Tires - P235/45R18 radial ply Tire pressure: 42 psi Suspension: Independent front, independent rear with locking differential Front Roll Stiffness (ft-lb/deg): 1500 Rear Roll Stiffness (ft-lb/deg): 2100 Spring stiffness (F/R lb/in): 150/200 Damping coefficient (F/R lb s/ft): 200/220 Roll axis height: 12 in
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b Following calculations are in SI units for consistency Power ... View the full answer
Related Book For
Fundamentals Of Momentum Heat And Mass Transfer
ISBN: 9781118947463
6th Edition
Authors: James Welty, Gregory L. Rorrer, David G. Foster
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