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Classification of crane mechanism
public
Group classification of crane mechanism
Crane mechanism classification
$$ M8 \: $$
Coupling torque
public
Calculates coupling torque requirements based on electric motor nominal torque and application safety factor.
Required torque
$$ T_{cn} = {T_n . f_s} $$
Crane classification
public
Group classification for the crane as a whole
Crane classification
$$ A6 \: $$
Crane operating cycles
public
No. of operating cycles for required service life
Total service cycles
$$ crane_{cycles} = {hoist_{cycles_{day}} \cdot hoist_{days} \cdot hoist_{years}} $$
Electrical motor nominal torque
public
Electrical motor nominal torque calculation based on motor nominal power and rotational speed.
Motor nominal torque
$$ T_n = {9550 \cdot \left({ {P_n \over n_n} }\right)} $$
Euler's number
public
Euler's number
$$ e = {2.71828} \: $$
Gear module
public
Gear module from reference diameter and number of teeth
Gear module
$$ m_{gd} = {{d_{r1} \over z_g}} $$
Gear module
public
Gear module from reference pitch
Gear module
$$ m_{gp} = {p_r \over \pi} $$
Gear reduction ratio
public
Reduction ratio of two gear wheels using number of teeth
First stage ratio
$$ i_{gr1} = {z_2 \over z_1} $$
Gearbox reduction ratio
public
Reduction ratio of 3 stage gearbox
Three stage gearbox ratio
$$ i_{gb3} = {i_{gr1} . i_{gr2} . i_{gr3}} $$
Gravity of Earth
public
Standard Earth gravity
Gravity
$$ g = {9.80665} \: m/s^2 $$
Hoist cycles per day
public
Number of hoist motion operating cycles in a day
Hoist motion cycles per day
$$ hoist_{cycles_{day}} = {hoist_{hours_{day}} \cdot cycles_{hour}} $$
Hoist hours per day
public
Operating time of hoist motion per day
Hoist motion hours per day
$$ hoist_{hours_{day}} = {{( hook_{cycles} \cdot hook_{travel} \cdot cycles_{hour} \cdot hours_{operating} ) \over \left({ v_{hoist} \cdot 60 }\right)}} $$
Load spectrum factor
public
Used to determine spectrum loading
Load spectrum factor
$$ K_{p_{crane}} = {0.63} \: $$
Load spectrum factor
public
Used to determine crane mechanism classification
Load spectrum factor
$$ K_{m_{crane}} = {0.63} \: $$
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
$$ cycles_{hour} = {4} \: $$
Pipe friction head loss
public
Calculates head loss due to wall friction in pipelines using Darcy friction factor.
Head loss
$$ Hf_{pipe} = {f_{Darcy} \cdot \left({ \left({ L_{pipe} \cdot V_{fluid} ^ 2 }\right) \over \left({ ID_{pipe} \cdot 2 \cdot g }\right) }\right)} $$
Rope reeving efficiency
public
Calculate efficiency of rope reeving arrangement
Reeving Arrangement Efficiency
$$ \eta_{reeving} = {\eta_{sheave} ^ \left({ n_{sheaves} }\right)} $$
Rope sheave efficiency
public
Calculates sheave efficiency in a rope reeving arrangement based on Euler-Eytelwein equation
Sheave efficiency
$$ \eta_{sheave} = {1 \over \left({ e ^ \left({ \mu \cdot \theta }\right) }\right)} $$
System curve factor
public
Determines relationship between flow and head loss in a pipeline
$$ k_{system} = {h_{loss} \over q ^ 2} $$
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