The effects of wind are very important in selecting the correct load cell sensor capacity and determining the correct installation for use in outdoor applications. In the analysis, it must be assumed that wind can (and does) blow from any horizontal direction.
This diagram shows the effect of wind on a vertical tank. Note that not only is there a pressure distribution on the windward side, but there is also a “suction” distribution on the leeward side.
The forces on both sides of the tank are equal in magnitude but opposite in direction and therefore have no effect on the overall stability of the ship.
Wind Speed
The maximum wind speed depends on the geographical location, altitude and local conditions (buildings, open areas, sea, etc.). The National Meteorological Institute can provide more statistics to determine how wind speeds should be considered.
Calculate wind power
The installation is mainly affected by horizontal forces, acting in the direction of the wind. These forces can be calculated by:
F = 0.63 * cd * A * v2
it’s here:
cd = drag coefficient, for a straight cylinder, the drag coefficient is equal to 0.8
A = exposed section, equal to container height * container inner diameter (m2)
h = container height (m)
d =Ship hole(m)
v = wind speed (m/s)
F = Force generated by wind (N)
Therefore, for an upright cylindrical container, the following formula can be used:
F = 0.5 * A * v2 = 0.5 * h * d * v2
In Conclusion
•The installation should prevent overturning.
•Wind factors should be considered when selecting dynamometer capacity.
•Since the wind does not always blow in the horizontal direction, the vertical component may cause measurement errors due to arbitrary zero point shifts. Errors greater than 1% of net weight are only possible in very strong winds >7 Beaufort.
Effects on Load Cell Performance and Installation
The effect of wind on force measuring elements is different from the effect on ships. The force of the wind causes an overturning moment, which will be offset by the reaction moment of the load cell.
Fl = force on pressure sensor
Fw = force due to wind
a = distance between load cells
F*b = Fw*a
Fw = (F * b)∕a
Post time: Oct-11-2023
