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Introduction
• Problem– Optimize Braking Performance
• Objective– Predict Temperature
Change– Measure Torque as
Temperature Changes
Analytical Model
• Lumped Capacitance (Bi = .01)
• qgen = 50% of Power (from measured torque and rpm)
• Convection– Approximated as Flat Plate– h = 22.5 W/m^2-K
Vc
ATThq
t
T
P
Sgen
)(
Results
Braking Performance
0
2
4
6
8
10
12
14
16
0 20 40 60 80 100
Time (s)
Bra
kin
g T
orq
ue
(ft-
lbs)
0
100
200
300
400
500
600
700
800
Ro
tor
Tem
per
atu
re (
°F)
Temperature
Torque
Results
0 10 20 30 40 50 60 70 80 900
100
200
300
400
500
600
700Brake Rotor Heating
Time (s)
Te
mp
era
ture
F
Predicted
Measured