Why am I not getting values for my step response transfer function using stepinfo

2022 5 3
1 个回答
更新时间：2022 5 3
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0 个投票

Using a step response transfer function, I attempted to use stepinfo to gather data on it, but for each value I get NaN or Inf:
ans =
struct with fields:
RiseTime: NaN
SettlingTime: NaN
SettlingMin: NaN
SettlingMax: NaN
Overshoot: NaN
Undershoot: NaN
Peak: Inf
PeakTime: Inf
This is my code:
num=[100, 301, 201];
den=[125, 125, -61, 40];
sys=tf(num,den)
step(sys)
stepinfo(sys)

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回答（1 个）

Star Strider
Star Strider 2022-5-3
Ran in:

1 个投票

Ran in:
Thjere are two poles in the right-half plane, so the system is unstable —
num=[100, 301, 201];
den=[125, 125, -61, 40];
sys=tf(num,den)
sys = 100 s^2 + 301 s + 201 ----------------------------- 125 s^3 + 125 s^2 - 61 s + 40 Continuous-time transfer function.
figure
pzmap(sys)
Poles = pole(sys)
Poles =
-1.4771 + 0.0000i 0.2385 + 0.3997i 0.2385 - 0.3997i
Zeros = zero(sys)
Zeros = 2×1
-2.0100 -1.0000
figure
step(sys)
grid
stepinfo(sys)
ans = struct with fields:
RiseTime: NaN TransientTime: NaN SettlingTime: NaN SettlingMin: NaN SettlingMax: NaN Overshoot: NaN Undershoot: NaN Peak: Inf PeakTime: Inf
.

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