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Dynamic amplification factor

Dimensionless number in physics

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Source updated March 5, 2026

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.

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

Where:

$M$ is the mass of the object in air (kg)

$g$ is the acceleration of gravity (9.81m/s2)

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

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