Cum se calculează Critical Speed

Ce este Critical Speed?

Critical speed is the rotational speed at which a rotating shaft reaches natural frequency resonance. Operating above or below critical speed is essential.

Formulă

Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))

W: W value — Variable used in the calculation

Ghid pas cu pas

1Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))
2Or use stiffness and inertia: ω_n = √(k/I)
3Operating speed should be <70% or >130% of critical

Exemple rezolvate

Intrare

Shaft natural frequency 3000 rpm

Rezultat

Operating range <2100 rpm or >3900 rpm safe

Avoid 2100-3900 band

Greșeli frecvente de evitat

✕Operating continuously near critical speed
✕Under-estimating critical speed (causes resonance)

Întrebări frecvente

What happens at critical speed?

Resonance causes excessive vibration, noise, and potential failure from fatigue.

Can you operate near critical speed briefly?

Yes, passing through critical speed quickly during startup/shutdown is acceptable.

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