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    • Thread Starter

    I have been working on an assignment and have done some head damaging stuff, feedback control with Matlab modelling mostly with continuous time systems

    Now I have gotten a bit stuck on something I think should be easy

    To cut a long story short I am designing a state feedback control I have done some tricky stuff I have set the poles at 0.5 and -0.5 (for stability) and gotten the K values to give the system

    X(n+1)= (F+GK)X(n) + GV(n)

    X1(n+1)=0.28X1(n) - 0.02288X2(n) + 0.0192V(n)
    X2(n+1)=-7.5X1(n) -0.28X2(2) +0.2(Vn)

    Y(n)=[1 0]X(n)


    Now I am asked to find the values of V(n) so that Y(n) converges to 3 in the steady state


    X1(n) = 3

    Now for a continuous time system it was easy the X1 was a constant so that X(dot)1 = 0 (differential of a constant = 0) and I could easily work the rest out and simulate my result

    My problem is I am used to differential equations not difference so I am unsure if X1(n) = 3 what does X1(n+1) =?????

    My senses tell me it would be 3 also as the output will not have changed anymore one sample time after infinity!!!

    So in a nutshell what do I need to do to calculate V(n)???, obviously set up two simultaneous equations but I don't know what to put in for the X(n+1)

    Any help much appreciated
    • Thread Starter

    Anyone???, is this posted in the wrong section? or is it harder than I think it is? :eek:
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