Dynamic amplification factor: Difference between revisions

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'''Dynamic Amplification Factor (DAF)''' or Dynamic Increase Factor (DIF), is a [[dimensionless number]] which describes how many times the [[deflection (engineering)|deflections]] or stresses should be multiplied to the deflections or stresses caused by the [[static load]]s when a [[Structural dynamics|dynamic load]] is applied on to a structure.<ref>Dynamics of structures by Anil K Chopra</ref>

When lifting an object during a sub-sea operation, the DAF is calculated based on dynamic hydraulic forces or on snap-forces. <ref>[https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2011-04/RP-H103.pdf Modelling and analysis of marine operation] {{Webarchive|url=https://web.archive.org/web/20160304200557/https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2011-04/RP-H103.pdf |date=2016-03-04 }}, DNV-RP-H103, April 2011</ref>

:<math> DAF = \frac{{F_{total}}}{{Mg}}</math>

Where:

:<math> M </math> is the mass of the object in air (kg)

:<math>g </math> is the acceleration of gravity (9.81m/s2)

:<math>F_{total}</math> is the largest of <math>{F_{static-max} + F_{hyd}} </math> or <math>F_{static-max} + F_{snap}</math> (N)

==References==

{{reflist}}

[[Category:Dimensionless numbers of physics]]

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