
#1
Mar1209, 11:04 AM

P: 3

hi guys,
can a time independent system model be controlled via a controller? I am assuming that we can obtain a solution for the model at each sample time, just assume that the model is of c= a*u type, i.e u is input which varing with the time. I am confsed.... 



#2
Mar1209, 03:00 PM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,895

It would help if you would say what you mean by "controlled" and "a controller".




#3
Mar1309, 01:12 AM

P: 3

more clearly, Q=m.c.delta(T) > the equation in diff. form would be dQ/dT=m.c.dT/dt, what I have is something like Q=m.c.delta(T),for this eq. the heater input for example, u, is varying with the time. (I am supposing that I have many many approximated formulas, not their differential forms and I cant have differential form of them) thank you for your help.. 



#4
Mar1309, 11:04 AM

P: 3

linear system which is time independent
hi guys,
I have sorted out the problem, and this solution has led to a new question. We have had a buch of equations in excel form where there were only time dependent. They were in fact a solution to a differential equation. for exmp:(1)..> dx/dt =x_{2dot}+ a*x_{dot}+c*x and what we have had in excel docs were the solution to above diff. eqns, i.e.(2)..> x(t)=exp(a*t)+ blah blah..., are the second eq. controllable using a discrete PID or any type of controller? the input to the 2nd equation is time only and the output is let say position. 


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