Diff: PT2.cpp

Revision:

0:3dd7aeceee65

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PT2.cpp	Thu Jan 22 11:41:02 2015 +0000
@@ -0,0 +1,42 @@
+#include "PT2.h"
+
+PT2::PT2() {
+    u = y = u_p1 = y_p1 = u_p2 = y_p2 = 0;
+    setParameters(1, 1, 0.5, 0.1);
+}
+
+PT2::PT2(double K_, double T_1_, double T_2_, double T_d_) {
+    u = y = u_p1 = y_p1 = u_p2 = y_p2 = 0;
+    setParameters(K_, T_1_, T_2_, T_d_);
+}
+
+void PT2::setParameters(double K_, double T_1_, double T_2_, double T_d_) {
+    if (T_d_ > 0)
+        T_d = T_d_;
+    else
+        T_d = 0.1;
+    K = K_;
+    T_1 = T_1_;
+    T_2 = T_2_;
+    a = 1 / T_1;
+    b = 1 / T_2;
+    c = exp(-a * T_d);
+    d = exp(-b * T_d);
+    b_1 = -K * ( (a - b)*(c + d) + b*(1 + d) - a*(1 + c) ) / (a - b);
+    b_2 = K * ( (a - b)*c*d + b*d - a*c ) / (a - b);
+    a_1 = -(c + d);
+    a_2 = c*d;
+}
+
+double PT2::out() {
+    y = -a_1 * y_p1 - a_2 * y_p2 + b_1 * u_p1 + b_2 * u_p2;
+    y_p2 = y_p1;
+    y_p1 = y;   
+    u_p2 = u_p1; 
+    u_p1 = u;
+    return y;
+}
+
+void PT2::in(double u_) {
+    u = u_;
+}
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