Input parameters
Input force: F
Outside diameter: D
Inside diameter: D 0 (for disc and cone brakes only)
Width: b
Cone angle: β (for cone brakes only)
Number of brakes (brake surfaces): N
Brake pressure(Max.): p (Max.)
Brake pressure.Speed(Max.): p.v (Max.)
Start speed: n 0
End speed: n 1
Start energy: E, see Energy Calculation chapter
Calculated Parameters
Friction force
for band brakes
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F t = F (e fα - 1) |
for others
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F t = F n f |
where:
| α | Length by angle | |
| f | Friction factor | |
| F n | Normal force | |
| for disc brakes: | ||
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F n = F / sin (β) |
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| for others: | ||
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F n = F |
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Brake torque calculation
T = 0.5 D e F t
where:
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D e |
equivalent diameter |
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for cone and disc brakes |
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for other D e = D |
Pressure calculation
where:
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A = N b L |
brake surface |
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b |
width |
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L = 0.5 D s α |
length |
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| α |
angle |
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D s |
mean diameter, for cone and disc brakes D s = 0.5 (D + D 0 ) |
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for other D s = D |
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Rough check of warming a brake
p ≤ p (M ax. )
p v ≤ p v (M ax. )
where:
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v = π D n 0 / 60 |
start circumferential speed |
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Calculation of braking time
where:
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reduced moment of inertia |
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speed/revolutions [rad/s] |
Number of revolutions until stop
Output Force F0
for band brakes only:
F 0 = F + F t = F e fα