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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.
Công thức
Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g))
- W
- W value — Variable used in the calculation
Hướng dẫn từng bước
- 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
Ví dụ có lời giải
đầu vào
Shaft natural frequency 3000 rpm
Kết quả
Operating range <2100 rpm or >3900 rpm safe
Avoid 2100-3900 band
Lỗi thường gặp cần tránh
- ✕Operating continuously near critical speed
- ✕Under-estimating critical speed (causes resonance)
Câu hỏi thường gặp
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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