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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.
ସୂତ୍ର
Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))
- W
- W value — Variable used in the calculation
ଷ୍ଟେପ୍-ଷ୍ଟେପ୍ ଗାଇଡ୍ |
- 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
ସମାଧାନ ହୋଇଥିବା ଉଦାହରଣ
ଇନପୁଟ୍
Shaft natural frequency 3000 rpm
ଫଳ
Operating range <2100 rpm or >3900 rpm safe
Avoid 2100-3900 band
ଏଡ଼ାଇବା ଯୋଗ୍ୟ ସାଧାରଣ ଭୁଲ
- ✕Operating continuously near critical speed
- ✕Under-estimating critical speed (causes resonance)
ବାରମ୍ବାର ଜିଜ୍ଞାସା
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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