scholarly journals An Expert PI Controller with Dead Time Compensation of Monitor AGC in Hot Strip Mill

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Fei Zhang ◽  
Shengyue Zong ◽  
Xiang Wang ◽  
Xiaohuai Ren
Keyword(s):  
High Speed ◽  
Process Model ◽  
Dead Time ◽  
Pi Controller ◽  
Smith Predictor ◽  
Hot Strip Mill ◽  
Hot Strip Rolling ◽  
Long Distance ◽  
Hot Strip ◽  
Finishing Mill

Hot strip rolling production is a high-speed process which requires high-speed control and communication system, but because of the long distance between the delivery stand of the finishing mill and the gauge meter, dead time occurs when strip is transported from the site of the actuator to another location where the gauge meter takes its reading, which seriously affects the thickness control effect. According to the process model which is developed based on the measured data, a filtered Smith predictor is applied to predict the thickness deviation of the finishing mill. At the same time, an expert PI controller based on feature information is proposed for the strip thinning during looper rising and coiler biting period and the strip thickening during the tension loss period of the strip tail end. As a result, the thickness accuracy has been improved by about 1.06% at a steady rolling speed and about 1.23% in acceleration and deceleration.

Application of Deformation to Improve Hot Ductility in the Peritectic Steel

2005 ◽  
Vol 500-501 ◽  
pp. 203-210 ◽  
Author(s):  
Ahmad Rezaeian ◽  
Faramarz Zarandi ◽  
D.Q. Bai ◽  
Steve Yue
Keyword(s):  
Flow Stress ◽  
High Strength ◽  
Microalloyed Steels ◽  
Hot Strip Mill ◽  
Mean Flow ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Slip Ratio ◽  
Hot Strip ◽  
Mean Flow Stress

The hot strip rolling of advanced microalloyed high strength steels still represents a new task to many mills due to the lack of data on the hot deformation resistance. With the aid of processing data from the Ispat-Inland hot strip mill, the “measured mean flow stresses” are calculated from the mill force using the Sims analysis and taking into account roll flattening, slip ratio and the redundant strain. A modification of the Misaka mean flow stress equation is proposed for C – Mn – Si – Al steels microalloyed with up to 0.02 % Nb. The effects of alloying and microalloying are then estimated. A new fitting parameter shows excellent agreement with the mean flow stress data from industrial processing of advanced high strength microalloyed steels. However, during the second half of the rolling schedule (lower temperature region), indications of austeniteto- ferrite transformation were found.

scholarly journals Simulation model of PI controller for the header flux control of ultra-fast cooling in hot strip mill

2018 ◽  
Author(s):  
Xudong Li ◽  
Fang Xu ◽  
Shuzhi Wang ◽  
Bo Gong ◽  
Changli Zhang ◽  
...  
Keyword(s):  
Simulation Model ◽  
Pi Controller ◽  
Hot Strip Mill ◽  
Flux Control ◽  
Ultra Fast Cooling ◽  
Hot Strip ◽  
Fast Cooling

Strip Width Model in Hot Strip Rolling

2014 ◽  
Vol 926-930 ◽  
pp. 856-859
Author(s):  
Kai Wu ◽  
Xiang Rong Song ◽  
Zi Ying Liu
Keyword(s):  
Calculation Model ◽  
Strip Width ◽  
Good Effect ◽  
Hot Strip Mill ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Practical Applications ◽  
Hot Strip ◽  
Flat Rolling ◽  
Physical Phenomena

This paper has researched strip width model in hot strip rolling. Analyzed physical phenomena influencing strip width, established calculation model in production including width spread during flat rolling, width change induced by bending, width changed by high temperature creep and thermal expansion and contraction during rolling. Practical applications in domestic 1500 hot strip mill show that the width model achieved good effect and enhanced the calculation precision.

Smith Predictor Position Control for the Inlet Guide Vane of Centrifugal Air Compressors

2006 ◽  
Author(s):  
Angela Sodemann ◽  
Yaoyu Li ◽  
Xin Wu ◽  
Rick Lancaster ◽  
Mark Rucker ◽  
...  
Keyword(s):  
Process Model ◽  
Position Control ◽  
Guide Vane ◽  
External Disturbance ◽  
Pi Controller ◽  
Smith Predictor ◽  
Inlet Guide Vane ◽  
Model Modification ◽  
Control Scheme ◽  
Air Compressors

Fast and accurate positioning of Inlet Guide Vane (IGV) is critical for flow regulation in centrifugal air compressors, especially for surge avoidance control. Both transport delay and external disturbance are present for IGV position control on a compressed air system. A Smith Predictor based control scheme with the process-model modification is applied to this problem. The adopted control scheme can both compensate for the time delay and effectively reject step disturbances present in the IGV system. Simulation was conducted using simple PI controller and a PI controller with the Smith Predictor with process-model modification. It showed that the proposed control scheme can achieve zero steady-state error with the presence of external disturbance and the settling time was shortened. Robust stability and performance of the system was discussed.

scholarly journals A New Mill-setup System for Hot Strip Finishing Mill Integrating a Process Model and Expertise.

2000 ◽  
Vol 40 (8) ◽  
pp. 771-778 ◽  
Author(s):  
Toshihiko Watanabe ◽  
Akira Kitamura ◽  
Hiroshi Narazaki ◽  
Yoshiyuki Takahashi ◽  
Hiroyuki Hasegawa
Keyword(s):  
Process Model ◽  
Hot Strip ◽  
Finishing Mill ◽  
Hot Strip Finishing Mill

scholarly journals Characteristics of High-carbon High Speed Steel Rolls for Hot Strip Mill.

1992 ◽  
Vol 32 (11) ◽  
pp. 1194-1201 ◽  
Author(s):  
Yoshikazu Sano ◽  
Toshiyuki Hattori ◽  
Michio Haga
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Hot Strip Mill ◽  
High Carbon ◽  
Hot Strip ◽  
Steel Rolls
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