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Sorry. *or a step/impulse input I want to know how a modeled mechanical system reacts to input. That is the goal. I agree, a continuous sinusoidal force is not appropriate in this case.

Not necessarily FEA, but manual methods. I think my question should be "how to I correctly model a non-linear spring in a mechanical model" such as in my first post. Isolators have loading and unloading curves. That means I have two nonlinear force vs displacement curves . Where do I begin...

Can you elaborate on that? I'm not sure I follow.

Hello everyone. I am familiar with simple mechanical system modeling using springs and dashpots, like below photos, in a transfer function: ...but can anyone point me in the correct direction for modeling this system with a rubber isolator? I cannot simply model isolators as...