How to set a spring whose stiffness changes with body's displacement

[Yupeng Duan]

Hi 

I am a beginer in using ProjectChrono, I want to calculate a body with a spring linked with the ground but the stiffness changes with the displacement of the body. I tryed give a if() i during the runtime ,but it seems nothing has changed, what should I do for this purpose.

[Radu Serban]

Yupeng – you can do this by implementing your own custom force callback for a ChLinkTSDA.

See demo_MBS_spring.cpp which illustrates the use of such a callback mechanism.  While that example is very simple and for demonstration only, you can implement whatever function you want for the force produced by the spring. Within the Evaluate() function, you have access to the ChLinkTSDA element itself which means you can access the current positions of the connected bodies and use that in the force evaluation if you so desire.

 

--Radu

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[Yupeng Duan]

Than you !  Radu