Problem with Simscape Onramp task 9

Hello, I can´t answer the last task, task 9, of the section 8.1 of the simscape onramp course, I do exactly what I´m requested to do but I always get it wrong, I´ve been for several hours trying it but I simply don´t understand what I´m getting wrong. I´ve looked for the answer on Youtube but literally nobady has upload it, at least I haven´t found anybody, does anybody knows how to obtain the answer or can anybody tell me where can I find the way to solve it?, thank you!

Answer 1

[Joel Van Sickel]

Hello Juan,

can you provide insight into what is says is going wrong? There are 2 validation check marks that need to be passed for this one. Did you modify your PID controller to only be a PI controller (look for a drop down box). It can be solved.

[Diana Odeleye]

Hello I am having the same issue as well, tried rebuilding the model several times but it still returns incorrect on the second( last) validation, when I view the response on the scope and the plot of w on the top right hand corner it shows that my line sits directly on the expected curve.

[Joel Van Sickel]

Did you change the PID controller to a PI controller? Can you include a screenshot of your model?

[John Duncan]

Hello I am running into the same issue. To say it shortly if I reset task 9 back to what it is supposed to be then I set the constant block to 5 and the PID to just PI with the 0.1 and 15/10 respectively the inertia: w comes up as a straight line at 0. I've checked everything as well as reset many times but still am getting no different result. Thanks for any help.

[Thomas Rulon]

I had the same issue until I realized my sum block was plus plus instead of plus minus. Hope this helps.

[John Duncan]

Yeah my sum block is definitely plus minus. I even had simulink reset using the "reset" button and even after chaning to the right values did not change anything.

[Sankalp Dua]

I am getting the exact same error, can any one please help?

[Joel Van Sickel]

anyone on this thread, if you are still having issues, can you take a screen shot of what your scope output is? This will show if the model is running as expected. It should look something like this:

John, your issue is that there the connection between the inertia should not also be connected to the rotational reference. This is essentially locking the rotor in place.

[Vislavath]

Please provide complete diagram. I am facing same issue in 8.1 project-Electronic valve Task 9.

Answer 2

[Muhammad Awais]

Did anyone able to solve this issue. I am stuck at the last task.

[Herminio]

See Joel Van Sickel provided diagram dated 6 April 2021.

On my case, the problem are the connection between the Controlled Voltage Source, the resistor, inductor, Rotational Electromechanical Converter and reference.

Just followed Joel's diagram for it.

Answer 3

[Nimish Pachchhapurkar]

I am unable to solve the last task even after trying everything mentioned above. This is my circuit.

[Eslam]

any solution?

Answer 4

[Alexi De Avila Cadena]

I have the same issue. The inertia block has this question mark on it. I have no idea what I did wrong. Everything else seems to be right except this part.

[Aditya]

Any solution?

Answer 5

[LE DANH MANH]

You can write in command window as image:

I solved this issue. Good luck !!!