Frequency Response and RLC Models — Cheat sheet

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Core rule

X=F0k−mω2+icω.X=\frac{F_0}{k-m\omega^2+ic\omega}.

Watch for

The forcing frequency of the largest displacement amplitude need not equal ωn\omega_n. For the standard model a nonzero peak occurs at ωn1−2ζ2\omega_n\sqrt{1-2\zeta^2} only when ζ<1/2\zeta<1/\sqrt2. Undamped resonance needs a separate time-domain solution.