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  3. Rope reeving efficiency


Rope reeving efficiency
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Calculate efficiency of rope reeving arrangement
Input
Number of sheaves
$ n_{sheaves} = 3 \: $
Result
Reeving Arrangement Efficiency
$$ \eta_{reeving} = {\eta_{sheave} ^ \left({ n_{sheaves} }\right)} $$

Preceding calculations (2)  
Euler's number
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Euler's number
$$ e = 2.71828 \: $$
Rope sheave efficiency
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Friction coefficient of sheave bearing $$ \mu = 0.005 \: $$ Wrap angle $$ \theta = 3.1415 \: rad $$
Sheave efficiency
$$ \eta_{sheave} = {1 \over \left({ e ^ \left({ \mu \cdot \theta }\right) }\right)} $$

Dependant calculations (1)  
Wire rope breaking force
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Load to be lifted
$$ P_{load} = 10.5 \: t $$ Number of rope falls
$$ n_{falls} = 2 \: $$ Safety factor
$$ s_f = 5.6 \: $$
Minimum required breaking force
$$ F_{breq} = {\left({ P_{load} \cdot g \cdot s_f }\right) \over \left({ n_{falls} \cdot \eta_{reeving} }\right)} \:, kN $$

Calculation details   Show in calculation

Number of sheaves in different rope reeving arrangements.

 Reeving Arrangement   No of sheeves 
 2 / 1   1 sheeve
 4 / 1  3 sheeves
 4 / 2   1 sheeve
 8 / 2  3 sheeves

 

Discipline: mechanical
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