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.¹

When lifting an object during a sub-sea operation, the DAF is calculated based on dynamic hydraulic forces or on snap-forces. ²

${\displaystyle DAF={\frac {F_{total}}{Mg}}}$

Where:

${\displaystyle M}$ is the mass of the object in air (kg)

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

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