pzmap(G+G) produces incorrect plot
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Given a system with 2 zeros and 5 poles:
s = tf('s')
G = 8.75*(4*s^2+0.4*s+1)/((s/0.01+1)*(s^2+0.24*s+1)*(s^2/100+2*0.02*s/10+1))
pzmap(G+G) produces a pole zero map in which all the poles are cancelled by zeros, which is clearly incorrect. It is also different to the result of pzmap(2*G), which would be expected to be the same.
Can anyone explain this behaviour?
采纳的回答
Star Strider
2019-12-3
The ‘+’ operator connects the two ‘G’ models in parallel. They do appear to have pole-zero cancellation as the result:
s = tf('s');
G = 8.75*(4*s^2+0.4*s+1)/((s/0.01+1)*(s^2+0.24*s+1)*(s^2/100+2*0.02*s/10+1))
GG = G+G
figure
pzmap(GG)
Calculating the minimum realisation solves the problem:
GGmr = minreal(GG)
figure
pzmap(GGmr)
2 个评论
Geraint Bevan
2019-12-3
Star Strider
2019-12-3
As always, my pleasure!
The ‘*’ operator would connect them in series.
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