سیستمهای کنترل خطی پاییز 1389
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بسم ا... الرحمن الرحيم. سیستمهای کنترل خطی پاییز 1389. دکتر حسين بلندي- دکتر سید مجید اسما عیل زاده. Frequency Response. Mpw. The Nichols Stability Method. -3dB. -72 deg wr=0.8. -142 deg. The Nichols Stability Method. GM. PM. Control System Design. Control System Design. - PowerPoint PPT PresentationTRANSCRIPT
سیستمهای کنترل خطی
1389پاییز
بسم ا... الرحمن الرحيم
دکتر حسين بلندي- دکتر سید مجید اسما عیل زاده
Frequency Response
The Nichols Stability Method
G 1
j j 1 0.2 j 1
Mpw 2.5 dB r 0.8
The closed-loop phase angle at r is equal to -72 degrees and b = 1.33The closed-loop phase angle at b is equal to-142 degrees
Mpw
-72 deg wr=0.8-3dB
-142 deg
The Nichols Stability Method
PM
GM
G 0.64
j j 2j 1
Phase Margin = 30 degrees
On the basis of the phase we estimate 0.30
Mpw 9 dB Mpw 2.8 r 0.88
From equation
Mpw1
2 1 2
0.18
We are confronted with comflecting s
The apparent conflict is caused by the nature of G(j) which slopes rapidally toward 180 degrees line from the 0-dB axis. The designer must use the frequency-domain-time-domain correlation with caution
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Control System Design
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Control System Design
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Control System Design
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Control Configurations
Control Configurations
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Control Configurations
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Control Configurations
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Control Configurations