scholarly journals Feedback Control of Rayleigh Convection in Viscoelastic Maxwell Fluids

2019 ◽  
Author(s):  
Ildebrando Pérez-Reyes ◽  
Cornelio Alvarez-Herrera ◽  
Jonathan Rodríguez-Campos
Keyword(s):  
Feedback Control ◽  
Maxwell Fluids ◽  
Rayleigh Convection

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

FEEDBACK CONTROL OF LH-SECRETION IN THE CASTRATED ADULT MALE MINIATURE PIG

1975 ◽  
Vol 80 (1_Suppla) ◽  
pp. S76
Author(s):  
N. Parvizi ◽  
F. Elsaesser ◽  
D. Smidt ◽  
F. Ellendorff
Keyword(s):  
Feedback Control ◽  
Adult Male ◽  
Miniature Pig ◽  
Lh Secretion

PFC design via FRIT Approach for Adaptive Output Feedback Control of Discrete-time Systems

2012 ◽  
Vol 132 (6) ◽  
pp. 834-841 ◽  
Author(s):  
Ikuro Mizumoto ◽  
Taro Takagi ◽  
Sota Fukui ◽  
Sirish L. Shah
Keyword(s):  
Feedback Control ◽  
Discrete Time ◽  
Output Feedback ◽  
Output Feedback Control ◽  
Discrete Time Systems ◽  
Adaptive Output Feedback Control ◽  
Time Systems

Passivity-based Pose Control for a Ground Vehicle through Drone's Visual Feedback Control

2019 ◽  
Vol 139 (11) ◽  
pp. 1316-1324
Author(s):  
Toshiyuki Murao ◽  
Mamoru Kuroda ◽  
Hiroyuki Kawai
Keyword(s):  
Feedback Control ◽  
Visual Feedback ◽  
Ground Vehicle ◽  
Pose Control ◽  
Visual Feedback Control

Minimal-Order Observer with a Function of Estimating Unmeasurable Inputs by High-Gain Feedback Control

2017 ◽  
Vol 137 (12) ◽  
pp. 1580-1590
Author(s):  
Katsuhiko Fuwa ◽  
Tatsuo Narikiyo
Keyword(s):  
Feedback Control ◽  
High Gain ◽  
Minimal Order
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