Page - 109 - in Adaptive and Intelligent Temperature Control of Microwave Heating Systems with Multiple Sources

4.2. IntelligentControl Ateach timek (k>1) : repeat 1 Receive themeasuredtemperaturevectorY(k); 2 Calculate theestimationRMSEof theNN estimator asχ(k), andupdate theestimationerror indexvia χind= 0.95 ·χind+0.05 ·χ(k). 3 Update theweightsof theNNestimatorusing the EKF algorithm; if Mod(Ct,2) = 0 then if χind < χth then 4 UsetheNNestimator to train the NN controller fornt times togetnewwc(k)andupdate the training timer nt=nt+1; 5 Calculate thenewcontrol input U(k) =G(Ytar(k),Y(k),wc(k)); else 4 Reset the trainingtimernt= 1; 5 Calculate the trainingcontrol input as w+(k) =w(k)+c(k)∆(k), U(k) =U+(k) =G ( Yt(k),Y(k),w (+)(k) ) ; 6 Update thecounternumberCt=Ct+1; else 4 Update theweightsof theNNcontroller by h(wc(k)) = J ( Y(k),U(+)(k) ) c(k)∆(k) wc(k+1) =wc(k)−α(k) ·h(wc(k)); 5 Update thecounternumberCt=Ct+1; 6 Calculate thenewcontrol input U(k) =G(Ytar(k),Y(k),wc(k)); until the endof the controlprocess; Figure4.7. Procedures in thesemi-directNNcontrol system(part2). 109