Brake Rotor Performance

Dave MarriottTim Jenkins

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

)(

Experiment

Experiment

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

Conclusions

• Mild Steel – Good for FSAE Competition

• Be Careful of Overheating

• Recommendations– Test More Materials– Further Develop Model