Hello ALL[0.02*(e^-Ts)] / (20s +1 )
T = ?
how can i find T ?
This is exctracted from an article :It looks like ctoren is trying to find the dead time for a transfer function. There is no equal sign in this case.
Dead times are determined empirically.
One would expect a thank you at least for contribution !I'm designing a cruise control system. I set the process value as 1 / (ms + b) = 1 / (980s + 40). Can I get it as
m = τp? would it be true that way? And I want to add the slope resistance of the ramp as an interference input. How can I do the laplace transform of (mgsin (theta))?
My advise for you would be to design/draw a block diagram prior to do any calculations or simulations.I have no knowledge of either control or laplace transformations. I cannot get help from my advisor.
Although I do not know the language, I search from books and try to design the system. My English is not good enough.
I asked earlier and asked how I can control the temperature and get the 's' domain, and I didn't have enough information. That's why I changed the system I was going to model and decided to design a cruise control system. Because in past topics , "I havent got any information about control". I mentioned this in the topics I opened.
I did not ask you to design or infer an existing system. As a person who has no knowledge of control and automation, I just wanted to learn how I can do it and the logic of the system. And I mentioned this in every post I uploaded. But you ask where is this value and where is this value, and I don't know what those values you ask mean. If I had an idea about the things you said and if I could give values, I would have stated them in my questions. But as I've said many times, I don't know control and I want to learn. Because I have homework and I have two days left. If I can't, I will be both a waiter and a student for another year, like I do to survive now .
So It was enough to just say the logic. I do not want to be disrespectful and I apologize for asking.
I took the vehicle's saturation speed 40 kmh and fixed the value of b .v = 40 kmh) Interpreting the graph and multiplying the value b by b = [(friction coefficient) * (mass) * (g)] / v ^ 2 and the transfer coefficient you said 0.02 / (20s + 1 ) I got the equation. I am just learning the control and I found it by trying these formulas. I asked if I can do Tp = m in the solution method you sent.
Thanks for helping Controlsguy25 and pnachtwey
Thank you for these clarifications.I used this equation for the process ;
m (dv / dt) + bv = u
msv (s) + bv (s) = u(s)
and for disturbances ;
Fs + Fg + m(dv/dt) = u(s)
Questions I Want to Ask;
1-) How can I add forces mgsin (angle of slope) = Fg and mg (coefficient of friction) (cos (angle of slope)) = Fs into this equation of speed and how I can transform this equation to Laplace equations ? And how this equations I convert to this into a FOPDT form?
2-) I found it with the formula b = [mg (friction coefficient)] / v ^ 2. Assuming the saturation speed as 40 kmh, I found the coefficient b accordingly. Is this formula correct?
3-) How can I convert the equation (1 / (ms + b)) to this into a FOPDT form?
Thank you for your support.
Please have a carefull reading on this excellent attached article.I wanted to design a simple feed forward control system where I could only control the speed. I could have designed a more detailed system, but I don't have enough time. So I just want to control the speed. Wheel torque, inertia, and air resistance can be neglected. As Disturbances I just thought of the slope of the road and the friction force. I don't know what Throttle means and the systems I researched also had this word. I guess there is no exact equivalent in my language. In the books I have reviewed, I haven't come across a model that I can design a static and dynamic feedforward controller. For this reason, I could not convert the values to FOPDT form and calculate the dead time and time constant. I would be glad if you could tell me if there is anything missing or need to add. Thank you for your help.
If I can determine Gp and Gd , I can design this system.
HiI have reviewed this text before. Used 2 inputs .I understood the velocity equation, but I could not understand how he calculated the forces. How did he get the signed equations? Can you explain?
You are welcome Ctoren!!!!Thank you very much for your help ControlsGuy25 . The documents will help me a lot. I will share the system after I designed it completely.
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