Discovering the Critical Speed of a Shaft: Effects of Bearing Support

Thread starter sunil Gaikwad
Start date Jun 30, 2015
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Shaft Speed

In summary, the critical speed of a shaft is the rotational speed at which it experiences resonance and excessive vibration, potentially leading to failure. It is calculated using the formula N = (C x √(g/R))/2π and is important for determining the safe operating speed of the shaft. Various factors such as material, geometry, and external factors can affect the critical speed, and it can be controlled through proper design, support structures, and maintenance.

Jun 30, 2015

sunil Gaikwad

how to find out critical speed of shaft without load. Shaft is supported at ends with bearings. what is the effect of this speed.

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Jun 30, 2015

Thyphon

I think this can help...

Jun 30, 2015

Baluncore

Science Advisor

2023 Award

Welcome to PF.
See;
https://en.wikipedia.org/wiki/Critical_speed
https://en.wikipedia.org/wiki/Dunkerley's_method

Jul 28, 2015

sunil Gaikwad

Thanks a lot sir...

Related to Discovering the Critical Speed of a Shaft: Effects of Bearing Support

What is the critical speed of a shaft?

The critical speed of a shaft refers to the rotational speed at which the shaft experiences resonance, causing it to vibrate excessively and potentially leading to failure. It is also known as the whirling speed or whipping speed.

How is the critical speed of a shaft calculated?

The critical speed of a shaft can be calculated using the formula: N = (C x √(g/R))/2π, where N is the critical speed in rpm, C is the coefficient of elasticity of the material, g is the gravitational constant, and R is the radius of the shaft.

Why is the critical speed of a shaft important?

The critical speed of a shaft is important because it helps determine the safe operating speed of the shaft. Operating the shaft at or above its critical speed can lead to excessive vibration, which can cause damage and failure of the shaft and any connected equipment.

What factors affect the critical speed of a shaft?

The critical speed of a shaft can be affected by various factors, including the material and geometry of the shaft, the type and placement of bearings, and the rotational speed. Additionally, external factors such as temperature and lubrication can also impact the critical speed.

How can the critical speed of a shaft be controlled?

The critical speed of a shaft can be controlled by changing the material and design of the shaft, using proper bearings and support structures, and avoiding operating the shaft at speeds close to its critical speed. Regular maintenance and monitoring can also help prevent issues related to critical speed.