Simscape Multibody: external force and motion inputs, reaction torque sensing.
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Hello everyone!
I'm using simscape multibody and I'm studying a simple 2-links multibody system.
The frame (1st link) is connected to the 2nd one through a revolute joint coupling.
I'd like to apply:
- a vertical external force (Fext) at the end of the 2nd link
- vary the angle-joint position (theta) from 45° to 60° (therefore, apply a vector, as the angle input, to the joint in Simscape)
The purpose of this study is to sense the Reaction torque (T) at the joint that balances the Fext so that the system stays sill (for every configuration of theta).
How can I do it using Simscape multibody's blocks?
Thank you very much in advance :)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1670306/image.jpeg)
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Dallas Perkins
2024-4-19
Hi ALESSIA,
You can use the External Force and Torque block to provide Fext. Set the resolution frame to world so that you can set it on whatever axis "down" is. For the revolute joint, under Actuation you can set Torque to "Automatically Computed" and Motion to "Provided by Input" to specify the joint angle.
If you're looking at multiple static positions (i.e. not changing during simulation) you can just run multiple simulations varying theta.
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Dallas Perkins
2024-5-9
I would send the torque output into a PS-Simulink converter and then log that signal in Simulink. Then after you simulate the model the data will be stored in out.logsout if you have the default logging configuration.
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