1 files changed, 11 insertions, 0 deletions
diff --git a/104/CH9/EX9.7/9_7.sce b/104/CH9/EX9.7/9_7.sce
new file mode 100755
index 000000000..33ebd383f
--- /dev/null
+++ b/104/CH9/EX9.7/9_7.sce
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+//stability of non minimum phase loop transfer_function
+s=%s;
+sys=syslin('c',1/(s+2)*(s^2+4))
+nyquist(sys)
+show_margins(sys,'nyquist')
+Z=0//no of zeroes of 1+G(s)H(s) in RHP(for sys to be stable)
+P=0//no of poles in RHP
+Pw=2//no of poles on jw axis including origin
+theta=(Z-P-0.5*Pw)*180
+disp(theta,"for stability theta=")
+printf("theta from nyquist_plot = 135 \n hence system is unstabe")
+\ No newline at end of file