Critical Speed ची गणना कशी करावी
Critical Speed म्हणजे काय?
Critical speed is the rotational speed at which a rotating shaft reaches natural frequency resonance. Operating above or below critical speed is essential.
सूत्र
Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))
- W
- W value — Variable used in the calculation
चरण-दर-चरण मार्गदर्शक
- 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
Worked Examples
इनपुट
Shaft natural frequency 3000 rpm
परिणाम
Operating range <2100 rpm or >3900 rpm safe
Avoid 2100-3900 band
Common Mistakes to Avoid
- ✕Operating continuously near critical speed
- ✕Under-estimating critical speed (causes resonance)
Frequently Asked Questions
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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