Critical Speed کا حساب کیسے لگائیں
Critical Speed کیا ہے؟
Critical speed is the rotational speed at which a rotating shaft reaches natural frequency resonance. Operating above or below critical speed is essential.
فارمولا
Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))
- W
- W value — Variable used in the calculation
مرحلہ وار گائیڈ
- 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
حل شدہ مثالیں
ان پٹ
Shaft natural frequency 3000 rpm
نتیجہ
Operating range <2100 rpm or >3900 rpm safe
Avoid 2100-3900 band
عام غلطیاں جن سے بچنا ہے
- ✕Operating continuously near critical speed
- ✕Under-estimating critical speed (causes resonance)
اکثر پوچھے جانے والے سوالات
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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