Critical Speed Nasıl Hesaplanır?

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

Formül

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

W: W value — Variable used in the calculation

Adım Adım Kılavuz

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

Çözümlü Örnekler

Giriş

Shaft natural frequency 3000 rpm

Sonuç

Operating range <2100 rpm or >3900 rpm safe

Avoid 2100-3900 band

Kaçınılması Gereken Yaygın Hatalar

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

Sık sorulan sorular

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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