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.

D A F = F t o t a l M g

Where:

M is the mass of the object in air (kg) g is the acceleration of gravity (9.81m/s2) F t o t a l is the largest of F s t a t i c − m a x + F h y d or F s t a t i c − m a x + F s n a p (N)