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derivation of tension ratio for pulley

derivation of tension ratio for pulley

derivation of tension ratio for pulley

(OP)
Can anyone please point me to a derivation of the tension ratio:
For belt drives use

T2/T1=e^(mu*beta)

where

T2 = tight side tension = load + T1
T1 = slack side tension

mu = friction coefficient
beta = wrap angle in radians

Thanks

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