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Problem with Section 7.1 Task 5 of Simscape onramp

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Although I correctly configured the model blocks and parameters accordingly to the directions, the training evaluation said my output did not match the answer. It prevents me from proceeding to the next task.
Here I attach two snapshots of the evaluation plot of Section 7.1 Task 5 where the problem occured.
The first picture shows comparison of the signals spanning to the end time (10sec). It looks to me exact agreement between the requirement and my signal, but it indicates slight discrepancies in the beginning of simulation (from 0 sec to around 1.0 sec) shown by the red dots. Due to these errors, the evaluator says my signal is incorrect.
The second picture zooms into the details of the red dots. It looks to me my signal has a slight delay to the answer.
I confirmed that my setup is consistent with the directions and the results unchanged even after several retries from the beginning of Section 7.1.
I am wondering if there is another parameter to be adjusted, which is not explicitly directed.
Can I have your help for solving this problem?
Amanullah S
Amanullah S on 4 Dec 2021
Thank you I too strucked and rectified after giving priority as low

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Accepted Answer

Joel Van Sickel
Joel Van Sickel on 18 Aug 2021
I am pasting Lianna's comment here as it is the solution.
Lianna Cubias on 7 Aug 2021 at 9:16
Figured it out! Finally!
Do tasks 1-5 as instructed. All that is correct. Before running the model in Task 5 try this:
Check the settings on the "Rotational electromechanical converter" block that your "ideal rotational motion sensor" is connected to. Go to the "Variables" tab, check the override box for "Angular velocity" and set priority to "high". Everything else, leave it the way it is. Then run the model. This worked for me because I was having this exact problem.
Daniel Mejia
Daniel Mejia on 2 Oct 2022
No me funciona nada, ni en alto ni bajo, ni cambiando el convertidor rotacional. nada

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More Answers (3)

Orkhan Alikhanov
Orkhan Alikhanov on 26 Sep 2021
It only worked for me after I set priority to "low" in the "Variables" tab of "Rotational electromechanical converter" block.
Shafie Mohamed Shafie Hassan
yes , set the Angular Velocity in the 'variables' section of 'rotational electro mechanical converter'MAT
that should work

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Alisha Schor
Alisha Schor on 11 Feb 2022
Edited: Alisha Schor on 11 Feb 2022
If possible, please update to R2021b, Update 1 or newer. This should resolve the issue without having to change any block settings.

Justin on 11 May 2024
Edited: Justin on 11 May 2024
An error will occur that resets the values of the PID block.
Change the PID back to PI.
Change the Proportional (P) value from 1 back to 1e-6.
Change the Integral (I) value from 1 back to 5e-3.
Change the Sample Time (-1 for inherent) from -1 back to 0.05.
This glitch is frustrating. I question the Previous solutions.




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