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Crane operating cycles
public
No. of operating cycles for required service life
Total service cycles
$$ crane_{cycles} = {hoist_{cycles_{day}} \cdot hoist_{days} \cdot hoist_{years}} \; \; $$
Hoist hours per day
public
Operating time of hoist motion per day
Hoist motion hours per day
$$ hoist_{hours_{day}} = {{( hook_{cycles} \cdot hook_{travel} \cdot cycles_{hour} \cdot hours_{operating} ) \over \left({ v_{hoist} \cdot 60 }\right)}} \; \; , h $$
No. of hoist cycles per hour
public
Number of hoist cycles per hour, used in class of utilisation for the crane as a whole.
No. of hoist cycles per hour
$$ cycles_{hour} = {4} \; \; $$
Load spectrum factor
public
Used to determine spectrum loading
Load spectrum factor
$$ K_{p_{crane}} = {0.63} \; \; $$
Electrical motor nominal torque
public
Electrical motor nominal torque calculation based on motor nominal power and rotational speed.
Motor nominal torque
$$ T_n = {9550 \cdot \left({ {P_n \over n_n} }\right)} \; \; , Nm $$
Pipe friction head loss
public
Calculates head loss due to wall friction in pipelines using Darcy friction factor.
Head loss
$$ Hf_{pipe} = {f_{Darcy} \cdot \left({ \left({ L_{pipe} \cdot V_{fluid} ^ 2 }\right) \over \left({ ID_{pipe} \cdot 2 \cdot g }\right) }\right)} \; \; , m $$
System curve factor
public
Determines relationship between flow and head loss in a pipeline
$$ k_{system} = {h_{loss} \over q ^ 2} \; \; $$
Euler's number
public
Euler's number
$$ e = {2.71828} \; \; $$
Coupling torque
public
Calculates coupling torque requirements based on electric motor nominal torque and application safety factor.
Required torque
$$ T_{cn} = {T_n . f_s} \; \; , Nm $$
Gear reduction ratio
public
Reduction ratio of two gear wheels using number of teeth
First stage ratio
$$ i_{gr1} = {z_2 \over z_1} \; \; $$
Gear module
public
Gear module from reference pitch
Gear module
$$ m_{gp} = {p_r \over \pi} \; \; $$
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