Hi I am working on a project these days where I try to estimate the damping and spring stiffness. The way the physical model is described is by a single mass kelvin model. Therefore the mathematical model is described with the following homogenous ODE:(adsbygoogle = window.adsbygoogle || []).push({});

mx’’ + cx’ + kx = 0

The problem is that I need to have a relationship between the damping and the spring stiffness. The k and c should also not be constants. They have to be non-linear.

So the question is if there are some good theories which can help me describe such non-linearity for c and k?

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# Non-linearity for c and k

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