Dynamic amplification factor

Dynamic Amplification Factor (DAF) or Dynamic Increase Factor (DIF), is a <a href="/facts/Dimensionless_number/TINrpQIq">dimensionless number</a> which describes how many times the <a href="/facts/Deflection_(engineering)/xroy2lX2">deflections</a> or stresses should be multiplied to the deflections or stresses caused by the <a href="/facts/Static_load/MAxjDyhc">static loads</a> when a <a href="/facts/Structural_dynamics/xWUPczL6">dynamic load</a> 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
            
          
        
      
    
    {\displaystyle DAF={\frac {F_{total}}{Mg}}}

Where:

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

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

F
          
            t
            o
            t
            a
            l
          
        
      
    
    {\displaystyle F_{total}}
  
 is the largest of 
  
    
      
        
          
            F
            
              s
              t
              a
              t
              i
              c
              −
              m
              a
              x
            
          
          +
          
            F
            
              h
              y
              d
            
          
        
      
    
    {\displaystyle {F_{static-max}+F_{hyd}}}
  
 or 
  
    
      
        
          F
          
            s
            t
            a
            t
            i
            c
            −
            m
            a
            x
          
        
        +
        
          F
          
            s
            n
            a
            p
          
        
      
    
    {\displaystyle F_{static-max}+F_{snap}}
  
 (N)

Dynamic amplification factor open-in-new

Dynamic amplification factor