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Figure 7.13

The action of the sustainable load Q and perturbing forces
with the largest value H of the maximum dynamic displacement
 can be represented as the sum of the static displacement 
д с
of the force Q and amplitude of forced oscillations, which is
calculated by the formula (7.42)
Q H Q  H 
      1  .
д  
c c c  Q 
This result can be written as:
   k , (7.45)
д с д
where k – dynamic ratio which
д
H
k 1   . (7.46)
д
Q
According to Hook's law stress proportional deformation,
the strain fluctuations can also be defined as the product of the
voltage at the load static to dynamic coefficient:
  k  .
д д c

Questions for self-assessment

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