Dynamic amplification factor explained

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]

DAF = ({F _{total})/() }

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)

Notes and References

1. Dynamics of structures by Anil K Chopra
2. https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2011-04/RP-H103.pdf Modelling and analysis of marine operation