APC UCCS Temperature Control Instrukcja Użytkownika Pobierz pdf (Strona 10)

ECE4510/ECE5510, INTRODUCTION TO FEEDBACK CONTROL 1–10

5. Evaluate design.

r(t) = 55, w(t) = 0 # y

(t) = 54.945

r(t) = 55, w(t) = 1 # y

(t) = 54.94

r(t) = 55, w(t) = 2 # y

(t) = 54.935

r(t) = 55, w(t) = 10 # y

(t) = 54.895 ... ≈ 0.2 % error!

" Feedback system rejects disturbances.

" Feedback system has steady state error .

r(t) = 55, w(t) = 0,plant=“9”, not “10” # y

(t) = 54.939

" Feedback system less sensitive to system parameter values.

NOTE! High feedback gain = good performance here. Not always

true! e.g.,Publicaddressampliﬁer.

Auto cruise-control example (attempt #3)

4. Third attempt. Try to get r id of steady state error.

Compensator

r (t)

(t)

w(t)

u(t)

0.5

(t) = 10

(

r(t) − βy

(t)

)

(

− 5w(t)

Lecture notes prepared by and copyright

! 1998–2013, Gregory L. Plett and M. Scott Trimboli

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APC UCCS Temperature Control Instrukcja Użytkownika Strona 10