Brake Rotor Temperature Nathan Bloomfield Josh Carroll Brian Winder.
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Brake Rotor Brake Rotor Temperature Temperature Nathan Bloomfield Nathan Bloomfield Josh Carroll Josh Carroll Brian Winder Brian Winder
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Transcript of Brake Rotor Temperature Nathan Bloomfield Josh Carroll Brian Winder.
Brake Rotor Brake Rotor TemperatureTemperature
Nathan BloomfieldNathan Bloomfield
Josh CarrollJosh Carroll
Brian WinderBrian Winder
ObjectiveObjective
Analyze brake rotor temperature for Analyze brake rotor temperature for a Formula SAE car.a Formula SAE car.
http://www.ntrc.gov/pdfs/showcase020506/DaleHartsock.pdf http://www.comsol.com/showroom/gallery/102.php#
AssumptionsAssumptions
Even heat transfer side to sideEven heat transfer side to side Kinetic energy of the wheels is not Kinetic energy of the wheels is not
significantsignificant All of the kinetic energy goes into All of the kinetic energy goes into
the brake rotors as heatthe brake rotors as heat There is nothing else slowing the car There is nothing else slowing the car
downdown
MethodMethod Assume 1.5 gAssume 1.5 g
constant accelerationconstant accelerationand deceleration to and deceleration to simulate race conditions.simulate race conditions.
Five cycles from Five cycles from 0 to 37 m/s (83 mph)0 to 37 m/s (83 mph)
In Excel, we found:In Excel, we found: Kinetic energyKinetic energy Initial temperature guessInitial temperature guess q"rad, q"conv and total q”q"rad, q"conv and total q” Final temperatureFinal temperatureAll of these change throughout the All of these change throughout the
cyclecycle
Car Speed vs. Time
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
0 5 10 15 20 25
Time (s)
Sp
eed
(m
/s)
Summary of ResultsSummary of Results
Brake Rotor Temperature vs. Time (same diameters)
200
250
300
350
400
450
500
550
0 5 10 15 20 25 30
Time (s)
Te
mp
era
ture
(K
)
Front Rotor
Rear Rotor
Brake Rotor Temperature vs. Time (different diameters)
200
250
300
350
400
450
500
550
0 5 10 15 20 25 30
Time (s)
Te
mp
era
ture
(K
)
Front Rotor
Rear Rotor
Summary of ResultsSummary of Results
Brake Rotor Temperature vs. Time (6.4 cm thick)
200
250
300
350
400
450
500
550
0 5 10 15 20 25
Time (s)
Te
mp
era
ture
(K
)
Front Rotor
Rear Rotor
Brake Rotor Temperature vs. Time (9.5 cm thick)
200
250
300
350
400
450
500
0 5 10 15 20 25
Time (s)
Te
mp
era
ture
(K
)
Front Rotor
Rear Rotor
Conclusions and Conclusions and RecommendationsRecommendations
Use different size rotorsUse different size rotors Rotor width can be changed to Rotor width can be changed to
increase or decrease the overall increase or decrease the overall temperaturetemperature
Questions?Questions?
