Identifikasi Sistem pakar Mey pptx

Identifikasi Sistem

P7-20

Consider the typical control system for the double-effect evaporator shown in Fig. P7-5. Evaporators are characterized by slow dynamics. The composition of the product out of the last effect is controlled by manipulating the steam to the first effect. The design feed rate and composition are 50,000 lb/h and 5.0 weight%, respectively. Figure P7-6 shows the open-loop step response of the product composition for a change of 0.75% by weight in the composition of the solution entering the first effect. Figure P7-7 shows the response of the product composition to a change of 2.5% in controller output. The composition sensor/transmitter has a range of 10 to 35 weight %.

a) Draw a complete block diagram with the transfer function of each block. What should be the fail-safe position of the control valve? What is the correct controller action?

b) Tune a proportional-integral controller for quarter decay ratio response.

Figure 7.6  perubahan

komposisi produk terhadap

perubahan 0.75% berat

komposisi feed

Figure 7.7  perubahan

METODE I PROSES REACTION

Perubahan Komposisi Produk Terhadap

Perubahan 2,5% Controller Output

Menggunakan garis bantu

maka didapatkan perhitungan

Berdasarkan perubahan output

controller



₅₁₆



_{410 s}



_{230 s}



 

t

_63%

Maka,

2. Berdasarkan perubahan output

controller



_{taktual=[0 50 75 100 150}

200 300 400 450 500 550

600 650 700 750 800];

%perubahan output cont



_{amplaktual=[21.5 21.5 21.57}

21.65 21.75 22 22.7 23.4

23.7 23.9 24.15 24.25 24.4

24.5 24.55 24.6];



_{g2_metode1=tf(1.28,}

[470.589 1]);



_{g2_metode1.inputdelay=110}

;



_{g2_metode2=tf(1.28, [270}

1]);

 _{ylabel('Komposisi produk (% berat)')}

 _{xlabel('Waktu (s)')}

 _{legend('aktual,controller','metode}