If two nodes are observed at a frequency of 1800 rpm during whirling of a simply supported long slender rotating shaft, the first critical speed of the shaft in rpm is
200
For a uniform simply supported shaft, bending-mode frequencies scale with n². Two internal nodes identify the third mode, so the first critical speed is 1800/3²=200 rpm.
Important Questions from Resonance and Whirling
Which of the following parameters has higher value during whirling of a shaft?
The whirling speed of a rotating shaft depends on its _________.
According to Dunkerley’s empirical equation, the frequency of the transverse vibration of the system of several loads attached to the same shaft is
- Whirling of a shaft occurs when natural frequency of transverse vibration ________.
If two nodes are noticed at a frequency of 1800 rpm during whirling of a simply supported long slender rotating shaft, determine the first critical speed of the shaft (in rpm).
