## Appendix B ISO method equations

Under the assumption that the oscillations of the observed degree of freedom are symmetric, the first and second derivative can be written in the following form:

If the observed degree of freedom can be described with a linear dynamic equation in combination with (38), (39) and (40) the following calculations can be done. From this, the final result is obtained and is shown with equations (42), (43) and (47).

a{—a>2Xm sin(wt)} + pL{ja>Xm sin(wt)} = —GN{Xm sin(wt)}

a[-a)2Xm sin(wt)} + yS fX^o»2 cos(wt) \cos(o>t)\} = — GN[Xm sin(wt)}

8 8 cos(wt) \cos(o>t)\ cos(o>t) = j — sin(wt)

3n 0N

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