Dynamic amplification factor

Dynamic Amplification Factor (DAF) or Dynamic Increase Factor (DIF), is a dimensionless number which describes how many times the deflections or stresses should be multiplied to the deflections or stresses caused by the static loads when a dynamic load is applied on to a structure. When lifting an object during a sub-sea operation, the DAF is calculated based on dynamic hydraulic forces or on snap-forces.

[math]\displaystyle{ DAF = \frac{{F_{total}}}{{Mg}} }[/math]

Where:

[math]\displaystyle{ M }[/math] is the mass of the object in air (kg)

[math]\displaystyle{ g }[/math] is the acceleration of gravity (9.81m/s2)

[math]\displaystyle{ F_{total} }[/math] is the largest of [math]\displaystyle{ {F_{static-max} + F_{hyd}} }[/math] or [math]\displaystyle{ F_{static-max} + F_{snap} }[/math] (N)