MATLAB: Stepinfo 2

Control System ToolboxfunctionMATLAB

s=tf([1000],[1 3 2 6592 36354 119894 230060 241392 120960]) S = stepinfo(s,'RiseTimeLimits',[0.05,0.95]) S = RiseTime: NaN SettlingTime: NaN SettlingMin: NaN SettlingMax: NaN Overshoot: NaN Undershoot: NaN Peak: Inf PeakTime: Inf it is obvious that this results appears when the denominator is bigger than the forth order what shall i do please answer….

Best Answer

The documentation shows a 5th order example, so the order must not be the total cause.

It would be worth testing with that example, in case there is something wrong with the calculations on your system.

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MATLAB: Stepinfo

1 and 2 are roots of the numerator and are also roots of the denominator. Therefore at 1 and 2, the value of the function is not simply one of the infinities but is instead 0/0 = NaN . Transfer functions that have point singularities like this do not have defined values for the parameters you are looking for.

MATLAB: Step is plotting backwards

The step function is correct.

Your system is unstable.

s = tf('s');
sys = (244.2*s + 244.2) / (0.015*s^4 + 1.525*s^3 + 2.51*s^2 + 245.2*s + 1221);
sys_poles = pole(sys)
sys_poles =
      -101.53 +          0i
       2.2371 +      12.99i
       2.2371 -      12.99i
      -4.6143 +          0i

You have a conjugate pair of poles in the RHP.

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MATLAB: Stepinfo

MATLAB: Step is plotting backwards

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