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Natural Frequency

fₙ = (1/2π)√(k/m). If you know the static sag instead of the stiffness, fₙ = (1/2π)√(g/δ) ≈ 15.76/√δ(mm). Isolation only starts above √2 × fₙ.

Spring-mass

Stiffness k (N/m)

Mass m (kg)

Damping ratio ζ

Natural frequency

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Damped fd

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Static deflection

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From static deflection

Deflection δ (mm)

Natural frequency

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Isolation

Forcing frequency (Hz)

Transmissibility

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Single degree of freedom. A helper, not a substitute for engineering judgment.