Measuring SimScape friction torque

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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

Accepted Answer

Juan Sagarduy
Juan Sagarduy on 16 Mar 2021
Hi Vivek I think that a torque sensor between the inertia and the friction element would work great. Br Juan
  2 Comments
Vivek
Vivek on 17 Mar 2021
Edited: Vivek on 17 Mar 2021
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 on 18 Mar 2021
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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