How to compute control system's performance parameters?

John Doe - 2025-01-02T21:04:15+00:00

Question: How to compute control system's performance parameters?

J = 0.2; b = 0.1; K = 0.2; R = 10; L = 5; s = tf('s'); p = K/((J*s+b)*(L*s+R)+K^2); step(p,200) [y,t]=step(p,200); stepinfo(y) With the following code, I want to measure the rise time. Using the stepinfo command, this is what pops in my command window : ans = struct with fields: RiseTime: 94.5571 %%Rise time SettlingTime: 172.5924 SettlingMin: 0.1735 SettlingMax: 0.1923 Overshoot: 0 Undershoot: 0 Peak: 0.1923 PeakTime: 1378 But when I check the parameters using the step response graph, the answer is different. So, why am I getting two different rise times? Any solution?

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Expert Answer

Prashant Kumar answered . 2025-11-20

You are not calling stepinfo correctlly.

 

stepinfo(p) 

produces:

ans = 

  struct with fields:

        RiseTime: 4.4144
    SettlingTime: 8.0108
     SettlingMin: 0.1735
     SettlingMax: 0.1923
       Overshoot: 0
      Undershoot: 0
            Peak: 0.1923
        PeakTime: 23.2961

 

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