Combining ODE with a IF function

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Dear all,

May I ask if anyone knows how to combine this 'if' function with these differential equations? k3 is a spring where the stiffness depends on the position of mass 3. In the attachment, I managed to achieve this in Python, but I didn't manage to do this in Mathcad.

Could someone help me so that I know for next time?"

Thanks in advance.

[Werner_E · Accepted solution]

Hope this helps:

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Dear Werner_E

Thank you it worked perfectly and I have only one remaining question. If I want to add the damping coefficient as add on in a function depending on speed it won't allow me to do this. It is not required for now but if i want to add this how do you handle this?

Thank you in advance

[Werner_E]

c3 and k3 are now functions dependent on the current value of x3(t).

So you must change every occurrence of c3 to c3(x3(t)) and the same for k3