scholarly journals DIRECT CHAOS TOWARDS LOW PERIOD MOTION BASED ON NOTCH FILTER FEEDBACK CONTROL

2001 ◽  
Vol 50 (10) ◽  
pp. 1846
Author(s):  
CAI CHAO-HONG ◽  
XU ZHEN-YUAN ◽  
XU WEN-BO
Keyword(s):  
Feedback Control ◽  
Notch Filter ◽  
Period Motion

Notch Filter Feedback Control for k-Period Motion in a Chaotic System

1997 ◽  
pp. 142-157 ◽  
Author(s):  
Walter J. Grantham ◽  
Amit M. Athalye
Keyword(s):  
Feedback Control ◽  
Chaotic System ◽  
Notch Filter ◽  
Period Motion

Theoretical and experimental study of Chen chaotic system with notch filter feedback control

2010 ◽  
Vol 19 (9) ◽  
pp. 090507
Author(s):  
Zhang Xiao Ming ◽  
Chen Ju-Fang ◽  
Peng Jian-Hua
Keyword(s):  
Experimental Study ◽  
Feedback Control ◽  
Chaotic System ◽  
Notch Filter

Notch filter feedback control of a chaotic system

2005 ◽  
Author(s):  
A.M. Athalye ◽  
W.J. Grantham
Keyword(s):  
Feedback Control ◽  
Chaotic System ◽  
Notch Filter

scholarly journals Stability and Bifurcation in Magnetic Flux Feedback Maglev Control System

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Wen-Qing Zhang ◽  
Jie Li ◽  
Kun Zhang ◽  
Peng Cui
Keyword(s):  
Control System ◽  
Hopf Bifurcation ◽  
Time Delay ◽  
Feedback Control ◽  
Magnetic Flux ◽  
Critical Value ◽  
Feedback Control System ◽  
Maglev System ◽  
Period Solution ◽  
Period Motion

Nonlinear properties of magnetic flux feedback control system have been investigated mainly in this paper. We analyzed the influence of magnetic flux feedback control system on control property by time delay and interfering signal of acceleration. First of all, we have established maglev nonlinear model based on magnetic flux feedback and then discussed hopf bifurcation’s condition caused by the acceleration’s time delay. The critical value of delayed time is obtained. It is proved that the period solution exists in maglev control system and the stable condition has been got. We obtained the characteristic values by employing center manifold reduction theory and normal form method, which represent separately the direction of hopf bifurcation, the stability of the period solution, and the period of the period motion. Subsequently, we discussed the influence maglev system on stability of by acceleration’s interfering signal and obtained the stable domain of interfering signal. Some experiments have been done on CMS04 maglev vehicle of National University of Defense Technology (NUDT) in Tangshan city. The results of experiments demonstrate that viewpoints of this paper are correct and scientific. When time lag reaches the critical value, maglev system will produce a supercritical hopf bifurcation which may cause unstable period motion.

Notch filter feedback control in a class of chaotic systems

Automatica ◽  
2002 ◽  
Vol 38 (4) ◽  
pp. 695-701 ◽  
Author(s):  
Chaohong Cai ◽  
Zhenyuan Xu ◽  
Wenbo Xu ◽  
Bin Feng
Keyword(s):  
Feedback Control ◽  
Chaotic Systems ◽  
Notch Filter

Use of vent stack temperature as a feedforward variable for dissolver total titratable alkali (TTA) control

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 261-269
Author(s):  
Wei Ren ◽  
Brennan Dubord ◽  
Jason Johnson ◽  
Bruce Allison
Keyword(s):  
Feedback Control ◽  
Current Practice ◽  
Feedforward Control ◽  
Control Variable ◽  
Indirect Measurement ◽  
Tight Control ◽  
Transfer Lines ◽  
Green Liquor ◽  
Process Dynamics ◽  
Downstream Processes

Tight control of raw green liquor total titratable alkali (TTA) may be considered an important first step towards improving the overall economic performance of the causticizing process. Dissolving tank control is made difficult by the fact that the unknown smelt flow is highly variable and subject to runoff. High TTA variability negatively impacts operational costs through increased scaling in the dissolver and transfer lines, increased deadload in the liquor cycle, under- and over-liming, increased energy consumption, and increased maintenance. Current practice is to use feedback control to regulate the TTA to a target value through manipulation of weak wash flow while simultaneously keeping dissolver density within acceptable limits. Unfortunately, the amount of variability reduction that can be achieved by feedback control alone is fundamentally limited by the process dynamics. One way to improve upon the situation would be to measure the smelt flow and use it as a feedforward control variable. Direct measurement of smelt flow is not yet possible. The use of an indirect measurement, the dissolver vent stack temperature, is investigated in this paper as a surrogate feedforward variable for dissolving tank TTA control. Mill trials indicate that significant variability reduction in the raw green liquor TTA is possible and that the control improvements carry through to the downstream processes.

134. Feedback Control of Dilution-Air Flow Rate for Aerosol Reduction

1999 ◽  
Author(s):  
P.T. O'Shaughnessy
Keyword(s):  
Feedback Control ◽  
Flow Rate ◽  
Air Flow ◽  
Air Flow Rate
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