Simulink Onramp 13.1 Task 4

Hello Matlab and Simulink Users,

I am stranded on 13.1 Peregrine Falcon Dive Part 2 Task 4. I just cannot seem to get past it. Any help regarding it will be appreciated.Even the solution does not provide the desired output signal.

Thanks

[Tresor Kahilu Wa Kahilu]

Task 4 is where you add the substract block?

Can you please give more details are to what seem to be your issue?

Answer 1

[Cris LaPierre]

Just went through this task. It works for me. First suggestion would be to restart MATLAB and see if the behavior continues. If you still are getting errors, are your low and high drag terms connected to the correct ports? Have you set the parameters of the switch?

Perhaps add an image of your model so we can see.

[Anmol Gurkha]

Hi Cris,

I really appreciate your response but I have tried the problem over 20x and restarted the program on several occasions but it gives me the same error. I do understand that it may be an issue on my end with understanding the problem than the software itself but its just that I have tried everything from brainstorming myself to even immitating the solution from the see solution as such to no avail.Here is a picture and be rest assured all the parameters have been checked over and over again all values from the integrator value to 0 to the Switch box and its parameters and the Drag constant boxes. Any help on the matter will be appreciated

[Sorapob prompraseat]

i can pass this task

[Cris LaPierre]

Ok, that is very helpful. It looks like you might have a carryover issue from task 1. The output of the switch block (side with one port) needs to be connected to the red dashed arrow in the middle of the page. It looks like you added a new product block instead.

[Anmol Gurkha]

Oh Thank you so much Cris. It worked right away!

[Agbaeze Ejem]

I spent hours trying to solve same problem. thank God i came across this answer

[Aniket Mangesh Londhe]

Thank you so much i was stuck in this task for hours.

[Luke]

This is not even the only bug like this. I shouldn't have to restart the program multiple times to do ONE simple task.

[Walter Roberson]

Varshan Prabu comments to @Cris LaPierre:

Thanks a lot. It worked

Answer 2

[Walid Al Hamadi]

i cannot do the task 5

13.1 Project - Peregrine Falcon Dive: (3/3) Part 2

i change the intioal condition but its gives me error.

thansks

[Ioannis Christodoulakis]

If you copied and pasted to create a new Integrator for the last task, make sure to reset the initial condition from -10 to the default value of 0!

[Faiz Sehic]

I did this but it doesnt help

[Cris LaPierre]

There is a new issue affecting task 5 in R2021b. See this post for a possible workaround.

https://www.mathworks.com/matlabcentral/answers/1468511-hi-i-am-stuck-on-simscape-onramp-course-task-5-of-feeback-control-practice-i-ve-tried-don-t-e#answer_809701

[Jaslynn]

Try branching the h signal to the Signal Assesment. Ensure Integrator2 has initial condition of -10.

[Alok]

please found error

Answer 3

[S N Rao]

I am also facing same issue.. Can anyone help me out?

[S N Rao]

Found my mistake..Thanks everyone

[Pawwthida Chanlila]

Hige Drag = 0.5*rho*Cd2*A2

[Atri]

What was the mistake that you found.... I am having the exact diagram but it is not working. Any help?

[Cris LaPierre]

Exactly the same? If so, check your equation for high drag. It should be using Cd2, not Cd1.

Answer 4

[Alice]

I have issues with task 4 as well... Can you spot the issue?

[Cris LaPierre]

Your model looks good to me. Can you click the "Inspect signal in figure window" and compare your signal there?

I might try clicking Reset and then redo this task.

[Alice]

Here's my signal... can you guess what is wrong with what I am doing?

[Cris LaPierre]

Sorry, I didn't get notified you'd replied. I think I figured out why you are getting this incorrect. I believe you copy/pasted the integrator that was already in the model rather than adding a brand new one. The one already in the model sets an initial condition that you do not want on your second integrator.

Please either set the initial condition to 0 in the new integrator block, or delete and add a new one from the library.