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how to obtain the parameters of the step response within matlab?

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SimTec
SimTec 2018-5-24
评论： M 2018-5-31
hello, I have step response in open loop of my model and I want to use Matlab to obtain the : T time constant L dead time A see figure

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回答（1 个）

M
M 2018-5-24
Look at the stepinfo command.
  2 个评论
SimTec
SimTec 2018-5-24
I tried that and not given meaningful result and it seems it is used only when there is some oscillation before settling.
M
M 2018-5-31
it is used only when there is some oscillation before settling.
No, try:
sys=tf([1],[1 1]);
you can check that it is a first order system (no oscillations) with:
step(sys);
and you can retrieve the data you want with:
stepinfo(sys)
ans =
struct with fields:
RiseTime: 2.1970
SettlingTime: 3.9121
SettlingMin: 0.9045
SettlingMax: 1.0000
Overshoot: 0
Undershoot: 0
Peak: 1.0000
PeakTime: 10.5458
What other meaningful information would you want?

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