@Nasir Roman definitely, I have been using flixzone for months myself =)

@Nasir Roman Definitely, have been watching on flixzone for years myself :)

@Nasir Roman definitely, have been watching on Flixzone for since december myself :)

Thomas, thanks for the helpful notes, I'll make sure this comment is visible in the future!

Gary, thanks for the update and for blazing the trail with the newer version of Matlab. I'm sure others will benefit from your knowledge (hopefully they read the comments 😀)

I'm glad you found it, sometimes it is hard to find that kind of information in the description so kudos for your detective skills :)

Thanks, I'm working on that video and hope to have it in a few weeks, thanks for watching!

I'm glad it was helpful thanks for watching!

@@ChristopherLum can you please explain trimming using trim command in matlab. its for an assignment and i am not getting anything

I'm glad it was helpful thanks for watching!

Sorry for the delayed response. The video you are looking for is at kzfaq.info/get/bejne/j-CKfJSHl9Oup2w.html.

[AE 511] I had the same question as Brad a few years ago Previously, you can have non-zero steady state values. It seems like steady state in the findop, we are defining steady state meaning 0

Hi, Thanks for the kind words, I'm glad you enjoyed the video. If you find these videos helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum or via the 'Thanks' button underneath the video. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. I can also answer any questions, provide code, notes, downloads, etc. on Patreon. Thanks for watching! -Chris

Hi, Thanks for reaching out. If you have questions or would like to request a video, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum. I'd love to have you as a Patron as I'm able to talk/interact personally with Patrons. Thanks for watching! -Chris

We want the boat moving in the +y direction so this means that y will be changing, but x is constant. Because x_1 = x and x_2 = y, this means that \dot{x}_1 should be 0 but \dot{x}_2 should be equal to the desired y-velocity.

@@ChristopherLum I agree that \dot{x}_2 = \dot{y} = 15 m/s. But 15 m/s is a constant value in this trim case which also means it is steady state. One steady state value is a constant of 0, but it can be any value (like 15 m/s) and still be steady state.

Ah, I see, I was using the SS notation to denote which states are in steady state. Go forward to around 24:30 and you'll see that the steady state constraint is on the state vector.

Hi Weijun, unfortunately I'm still in the process of putting that video together. It is a little far down on the list of videos so it might take a while for it to get on the channel, sorry!

@@ChristopherLum Thanks Prof. Lum for your quick reply, I will watch it when it is ready on the channel.

I may have answered my own question, I just ran across Gary's comment below!

Hi Tim, I'd actually recommend that you follow along using your RCAM model. The planar vehicle is actually too simple and you really want to do this with your aircraft model. If you run into trouble and want the planar vehicle let me know and I can try to dig it up and send it.

@@ChristopherLum I have managed to make it work on RCAM with some initial struggle. The difference between versions are quite apparent here.

Thanks for reaching out. If you have questions or would like to request a video, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum. I'd love to have you as a Patron as I'm able to talk/interact personally with Patrons. Thanks for watching!

@@ChristopherLum absolutely. thanks

@@alexnguyennn Phi, great, I'll be sure to look for you over on the Patreon page. Please feel free to re-post this or any other question over there and I'll be able to respond and we can talk more about control systems on the Patreon platform. I'm looking forward to the talk! -Chris

@@ChristopherLum i just registered and i will directly ask you if i have question. i have been following you for a month on KZfaq and Linkedin :). For this video, i think there is 2D so only have 6 dof, the other video RCAM model is using full derivation.

@@alexnguyennn Thanks, I'm thrilled to have you as a Patron! To answer your question, the nomenclature of 'degrees of freedom' is sometimes a little lose. With traditional rigid body dynamics, you can describe the orientation (sometimes also referred to as the pose) using 6 values (3 translational position and 3 rotation euler angles). This is why most people refer to this as a 6 DOF model. However, if you are generating a dynamic model of this vehicle, from our investigation of state space models, we know that we actually need twice that many number of states (3 translational positions, 3 translational velocities, 3 rotational positions, and 3 rotational velocities) for a total of 12 states. Confusingly, sometimes people refer to states as degrees of freedom so you really need to be careful of the context in which these terms are used. In this particular video, you are correct in the sense that I've restricted the motion/dynamics to a 2D plane and as such, there are only 3 DOF which need 6 states to describe. Does this answer your question?