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LEVEL-1
• Frequency Response
– Experiments
– Modeling
• Jim Henry
LEVEL-1• Intro & Background
• SSOC
• Step Response -- Expt & Model
• Sine Response -- Expt & Model
• Conclusions
LEVEL-1
•
LEVEL-1
•
LEVEL-1
•
LEVEL-1
•
LEVEL-1
•
K = Gain (cm/%)Tau = Time FactorT0 = dead time
LEVEL-1
•
LEVEL-1
•
• STEP UP (avg.)
• T = .15 (±) .09
• t0 = .02 (±) .01
• K = .635 (±) .05
• STEP DOWN (avg.)
• T = .073 (±) .02
• t0 = .027(±) .04
• K = .652 (±) .09
• T = minutes
• t0 = minutes
• K = cm/%
LEVEL-1
• Sine Experiments for Bode Plot
Barney
LEVEL-1
•
Barney
LEVEL-1
• Sine Experiments for Bode Plot
• AR vs. frequency
• PA vs. frequency
Barney
LEVEL-1
(cm/%)
Barney
LEVEL-1 Barney
LEVEL-1
• Sine Modeling for Bode Plot
• AR vs. frequency
• PA vs. frequency
Barney
LEVEL-1
(cm/%)
Barney
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• Sine Model
• T = .1 minute
•
• K = .55 cm/%
• order about 1st
Barney
LEVEL-1 Barneyf =12 c/mu
LEVEL-1
(cm/%)
Barneyf =12 c/mu
0.063 cm/%
LEVEL-1
• Sine Model
• T = .1 minute
• to = 0.02 minute
• K = .55 cm/%
• order about 1st
• fu = 12 cycles/min• Kcu= 1/0.063 = 16 %/cm
Barney
LEVEL-1
• CONCLUSION• best estimate of FOPDT parameters
• T = .1 minute
• to = 0.02 minute
• K = .55 cm/%
Barney
LEVEL-1
• Illustration• experiments & model for 3 different
frequencies
• Low freq
• Medium freq
• High freq
Barney
Note from Dr. Henry:Following three slides showExcel graphs of the time-response curves for experiments and modelsfor 3 different frequencies
LEVEL-1• CONCLUSION• best estimate of FOPDT
parameters
• T = .1 minute
• to = 0.02 minute
• K = .55 cm/%
LEVEL-1• CONCLUSION
• order about 1st
• fu = 12 cycles/min• Kcu= 1/0.063 = 16 %/cm