Measuring SimScape friction torque

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Vivek
Vivek 2021-3-16
评论： Juan Sagarduy 2021-3-18
What would be the best way to measure friction torque generated by the rotational friction block shown in the image of a simple rotational system in the image? The system has a constant input connected to an ideal torque source and an idealised rotational motion sensor as the output.
Screenshot of Simscape rotational system

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Juan Sagarduy
Juan Sagarduy 2021-3-16
Hi Vivek I think that a torque sensor between the inertia and the friction element would work great. Br Juan
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Vivek
Vivek 2021-3-17
编辑：Vivek 2021-3-17
Hi Juan I have attached a snapshot of the connection:
The parameters are set as follows:
The output looks like this:
It appears that the friction torque starts from -468.66Nm without displaying the characteristic starting curve.
  • What could be the issue here?
On the other hand, if the Rotiational Simscape Interface block is used, the friction torque reads -156.2Nm (constant value, ratio:-0.33).
  • Why could this be different? (If this is an acceptable solution)
Thanks in advance for your help!
Juan Sagarduy
Juan Sagarduy 2021-3-18
Hi Vivek,
This is the way to capture the friction torque. The sensor has to be in series (not parallel) with the friction element. The results show the expected behaviour.
Br Juan

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