Do I Need to Include Mounted Weights When Calculating Shaft Critical Speed?

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When calculating the critical speed of a shaft, it is essential to include the weight of all mounted components, such as gears and pulleys, as they affect the natural frequency. The critical speed relates to resonances, and these additional weights alter the shaft's dynamics. The formula for critical speed incorporates the total weight and its distribution, emphasizing the importance of including mounted weights in the calculations. Ignoring these weights can lead to inaccurate assessments of the shaft's performance. Therefore, all mounted weights must be accounted for to ensure precise critical speed calculations.
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For the critical speed of the shaft, should I include the weight of the members mounted on the shaft (gears, pulleys, etc.) with the forces acting on it?
 
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Ballena Joseph said:
For the critical speed of the shaft, should I include the weight of the members mounted on the shaft (gears, pulleys, etc.) with the forces acting on it?

I wish you would be more explicit in your questions and give the context of what you are asking about.

Do you mean the critical speed as in resonances? Ihttps://en.wikipedia.org/wiki/Critical_speed

If so, then yes. Everything mounted on the shaft changes the natural frequency.
 
anorlunda said:
I wish you would be more explicit in your questions and give the context of what you are asking about.

Do you mean the critical speed as in resonances? Ihttps://en.wikipedia.org/wiki/Critical_speed

If so, then yes. Everything mounted on the shaft changes the natural frequency.
Critical speed of the shaft with given deflection and weight. From the formula: nc = (30/π)(ΣWy/ΣWy2)½
 
You most definitely need to include all the weights mounted on the shaft inthe summations. When the shaft whirls, they must move with it.
 
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