Paano Kalkulahin si Critical Speed
Ano ang 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.
Pormula
Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))
- W
- W value — Variable used in the calculation
Step-by-Step na Gabay
- 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
Mga Nalutas na Halimbawa
Input
Shaft natural frequency 3000 rpm
Resulta
Operating range <2100 rpm or >3900 rpm safe
Avoid 2100-3900 band
Mga Karaniwang Mali na Dapat Iwasan
- ✕Operating continuously near critical speed
- ✕Under-estimating critical speed (causes resonance)
Mga madalas itanong
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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