Change of temperature in disc brakes

  • Thread starter Davieslad
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Homework Statement



Basically ive got a brake system which i have designed, and i need to calculate if the brake fluid will overheat if the vehicle brakes from its top speed to a halt, and if so at what speed (or how long after braking commences) they will overheat

Brake force = 13000N
Distance = 2500m
Brake rotor radius =0.2m
Brake rotor Surface area (for all 4)= 2.11m^2
Mass of (all 4) rotors = 32kg
Specific heat capacity of the rotor = 1400JKg/K
heat transfer coefficient = 0.5

Homework Equations



w=Q=f.d
Q=mc(T-T)
Q=hA(T-T)

The Attempt at a Solution



Ive made a simulink model using the above formulae, but im getting the brakes heating up by about 1000 degrees per second, and them cooling by about 0.2 degrees, so im fairly certain ive made a balls up somewhere.

Can anyone enlighten me as to a good way of solving this?

Cheers

Ed
 

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