What is the Impact of Imbalance Force on a Rotating Shaft?

In summary, the speaker is working on rotordynamic work with an outside colleague who is conducting bearing research. The speaker shared their steady-state response with the colleague and they were surprised by the bearing loads, which were much higher than they had previously analyzed with another engineer. The speaker asks if they can use a simple equation to estimate the forces involved at a certain frequency, and the colleague confirms that it is possible. They also suggest adding a more realistic scenario by adjusting the equation for a couple imbalance. The speaker is satisfied with this information.
  • #1
minger
Science Advisor
1,496
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I'm doing some rotordynamic work with an outside guy is doing some bearing research for us. I sent him my steady-state response as a function of frequency, and he's almost taken aback by the bearing loads. He said that long ago he did the analysis with another engineer (no longer here) and they were an order of magnitude lower.

As a quick back-of-envelope, could I simply do:
[tex]
F = mr\omega^2[/tex]
To get an idea of the magnitude of forces involved at a frequency?
 
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  • #2
For a point imbalance. Sure. You can throw in a bit more realistic situation by making it a couple imbalance by just adjusting it to

[tex]T= 2mrl \omega^2[/tex]
 
  • #3
Good enough for me, thanks.
 

FAQ: What is the Impact of Imbalance Force on a Rotating Shaft?

What is an imbalance force on a shaft?

An imbalance force on a shaft is a force that causes the shaft to vibrate or rotate unevenly. It occurs when the center of mass of a rotating object is not aligned with its axis of rotation, resulting in a net force on the shaft.

What causes an imbalance force on a shaft?

An imbalance force on a shaft can be caused by a variety of factors, such as uneven distribution of mass on the rotating object, misalignment of the shaft or bearings, or external forces acting on the shaft.

What are the effects of an imbalance force on a shaft?

An imbalance force on a shaft can lead to increased wear and tear on the shaft and bearings, decreased efficiency and performance of the rotating object, and potentially dangerous vibrations that can cause equipment failure.

How can an imbalance force on a shaft be measured?

An imbalance force on a shaft can be measured using specialized equipment such as a vibration analyzer, which can detect and measure the magnitude and frequency of vibrations caused by the imbalance. Alternatively, traditional balancing methods can be used to manually correct for the imbalance.

How can an imbalance force on a shaft be corrected?

An imbalance force on a shaft can be corrected by balancing the rotating object, either by redistributing mass or by adjusting the position of the shaft or bearings. This can be done manually or with the help of specialized balancing equipment.

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