Rincent Minidyn V9, User Manual

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Rincent ND Technologies Minidyn User Manual Page 18
2.2 Stiffness calculus algorithms
2.2.1 Max method
The Max method is a simple stiffness algorithm that use a quasi-static ground
approximation (ground dynamic parameters are ignored).
In this hypothesis, the ground is equivalent to a simple spring and the stiffness is given by
the ratio of maximum load to the maximum deflection.
Figure 12 : Max method.
2.2.2 Integral method
The integral method is a method that take into account the dynamic parameters of the
ground. This method is inspired of the modulus calculation that is performed in NFP-94.117-
2 French standard for dynamic modulus calculation.
The ground is modeled as a system comprising a weight m a spring k and a damping c . An
inversion algorithm is used to retrieve
m, c, k
parameters and removing the bias from the
weight and damping.
f
max
x
max