The Mathematical Models and Simulation on Work Roll Bending Control System of Cold Rolling Mill

2014 ◽  
Vol 556-562 ◽  
pp. 2337-2341
Author(s):  
Yan Ping Wang ◽  
Xin Bing Yang ◽  
Yao Hui Jin ◽  
Bao Quan Liu ◽  
Jun Sheng Wang
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Influence Function ◽  
Rolling Mill ◽  
Work Roll ◽  
Cold Rolling Mill ◽  
Roll Bending ◽  
Simulation Results ◽  
Equivalent Load ◽  
The Mathematical Model

The calculated result of the mathematical model based on the conventional transfer function has bigger deviation than the measured. In this paper the mathematical model of the work roll bending is derived. The modeling is different from conventional modeling used many presumptions and linear processing. The modeling calculated accurately the equivalent load spring using the method of influence function. The simulation results agree well with actual data of the bending system.

FPGA-Based Design of P-Detection 1-Persistent CSMA Control System

2014 ◽  
Vol 602-605 ◽  
pp. 933-936 ◽  
Author(s):  
Zheng Gang Liu ◽  
Hong Wei Ding ◽  
Jia Long Xiong ◽  
Qian Lin Liu ◽  
Xiao Hui Ma
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
System Performance ◽  
Communication Protocol ◽  
Test Results ◽  
Fpga Design ◽  
Simulation Results ◽  
Communication Control ◽  
The Mathematical Model ◽  
Waveform Simulation

In this paper, we propose P-detection and 1-Persistent CSMA/CA protocol. Using average cycle method, we established the mathematical model of the protocol. Through derivation, we obtain the throughput expression of this protocol. Simulation results show that this protocol improves the throughput and it is effective to enhance the system performance. Using this protocol, we completed the FPGA design of communication control system in WSN. The product passed waveform simulation and it is downloaded to the DB2 platform. Test results confirm the throughput of system has been increased, achieving the improvement of communication protocol for WSN.

Research on Control System of Gearless Permanent Magnet Synchronous Traction Elevator

2011 ◽  
Vol 383-390 ◽  
pp. 5945-5950
Author(s):  
Yan Hu ◽  
Zhen Guang ◽  
Xiao Yu Wang
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Permanent Magnet ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Modulation Method ◽  
Driving System ◽  
Simulation Results ◽  
The Mathematical Model

A driving system for gearless traction machine plays an very important role in controlling elevator’s running. And its performances have a direct effect on the elevator’s performance. On the basic of the mathematical model of the gearless permanent magnetic synchronous machine (PMSM), id=0 vector control method and space vector pulse width modulation method are used in the control system. Then making a simulation on the system designed by MATLAB/SIMULINK. The simulation results show that the control method is feasible.

Shape and Flatness in Thin Strip Rolling

1972 ◽  
Vol 94 (4) ◽  
pp. 1113-1123 ◽  
Author(s):  
H. W. O’Connor ◽  
A. S. Weinstein
Keyword(s):  
Mathematical Model ◽  
Work Roll ◽  
Thin Strip ◽  
Test Results ◽  
Considerable Influence ◽  
Strip Rolling ◽  
Roll Bending ◽  
Strip Shape ◽  
Mill Stand ◽  
The Mathematical Model

The paper describes measurements of lateral flow of material which took place during cold rolling thin strip. This sideways flow is shown to have a considerable influence of the final flatness of the strip. A mathematical model of a rolling mill stand is described, which includes a calculation allowing for sideways flow of material. Parameter studies are made using the mathematical model, which show the influence of crowns, tensions, back-up and work roll bending on the resultant strip shape. A comparison is made between results predicted by the model and test results obtained on a production mill.

Technical Characteristics and Application for a New Type of 8-Roll Cold Rolling Mill

2012 ◽  
Vol 572 ◽  
pp. 55-60 ◽  
Author(s):  
Peng Liu ◽  
Hong Bo Li ◽  
Zhi Qian Shen
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Fast Response ◽  
Cold Rolling Mill ◽  
Strip Flatness ◽  
Roll Bending ◽  
Roll Mill ◽  
Flatness Control ◽  
New Type

This paper focuses on a new type of 8-roll cold rolling mill with the back-up bearing roll. Compared to the traditional 6-roll cold rolling mill, a thick-walled bearing roll is used to multi-support the intermediate roll. By the rack, the fan-shaped gears, the eccentric core shaft and the servo-cylinder, the work roll can be pushed down by this screw down device on the top of the mill; By contrast with the 4(6)-roll mill, this type of mill has some characteristics, such as: the small size of rolls, lighter weight, the fast response for the screw down. The bearing roll is fixed by the supporting blocks placed on the rolling-mill housing. So this mill has large traverse rigidity, and this is propitious to the flatness control. By different means of strip flatness adjustments, such as the intermediate roll shifting, the roll bending and the bearing roll adjusting, the strip flatness can be well controlled. The oil-gas lubrication is used in the bearings of the bearing rolls, and the changing rolls equipment is designed for this type of mill too. A series of this type of mills (as 450, 800, 1250, 1450 series) have been produced since it was developed in 1997. The mills for 1250 and 1450 series have been applied in five-stand cold rolling mill and single stand reversing mill, a rolling speed of 800m/min has been achieved.

Performance Analysis of Asymmetrical Roll Bending for Flatness Control of Cold Rolling Mill

2010 ◽  
Vol 145 ◽  
pp. 93-99 ◽  
Author(s):  
Dian Hua Zhang ◽  
Peng Fei Wang ◽  
Wen Xue Zhang ◽  
Xu Li
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Control Analysis ◽  
Cold Rolling Mill ◽  
Roll Bending ◽  
Flatness Control ◽  
Efficiency Factors ◽  
Self Learning ◽  
Asymmetrical Bending

When there appeared catastrophic asymmetrical flatness defects in rolling processes, especially when the incoming strip is with a wedge shape, the tilting roll can hardly eliminate these defects completely. Moreover, the overshooting of tilting roll will lead to strip break. In order to improve the ability of cold rolling mill for asymmetrical flatness defects control, performance of the work roll asymmetrical bending as well as the intermediate roll asymmetrical bending has been analyzed, based on the actuator efficiency factors of them. In addition, for the purpose of obtaining accurate efficiency factors matrixes of actuators, a self-learning determination model of actuator efficiency factors was established in accordance with the practical rolling processes. In this paper, a 1250 single stand 6-H reversible UCM cold mill was taken as the object of this study, with efficiency factors of asymmetrical roll bending analyzed, which provides a theoretical basis for better flatness control. Analysis shows that the asymmetrical roll bending is significant for asymmetrical flatness control.

Analysis and synthesis of converter control system of autonomous induction generator with field oriented control

2013 ◽  
Vol 62 (2) ◽  
pp. 267-279 ◽  
Author(s):  
Błażej Jakubowski ◽  
Krzysztof Pieńkowski
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Control Algorithm ◽  
Induction Generator ◽  
Field Oriented Control ◽  
Analysis And Synthesis ◽  
Simulation Results ◽  
The Mathematical Model ◽  
Load Circuit

Abstract The paper presents the mathematical model of an autonomous induction generator with the AC load circuit and the converter control system of the voltage magnitude at the terminals of stator generator. The control algorithm and the structure of the control system are described. The simulation results of the control system are presented and discussed.

Adaptive Learning of Bending Force Presetting Model in a Six-High Cold Rolling Mill

2011 ◽  
Vol 291-294 ◽  
pp. 601-605
Author(s):  
Jin Lan Bai ◽  
Jun Sheng Wang
Keyword(s):  
Cold Rolling ◽  
Adaptive Learning ◽  
Rolling Mill ◽  
Legendre Polynomials ◽  
Work Roll ◽  
Practical Application ◽  
Cold Rolling Mill ◽  
Bending Force ◽  
Roll Bending ◽  
Exponential Method

In this paper, adaptive learning method of bending force presetting model in a six-high cold rolling mill is introduced. Adaptive learning coefficient of bending force presetting model is calculated by contrast between measured and model calculated actual bending force, then exponential method is used to modify the adaptive learning coefficient to improve the precision of the bending force presetting model. While calculating model calculated actual bending force, Legendre polynomials are used to convert measured flatness data to quadratic and quartic flatness coefficient, then regulating quantity on the quadratic flatness coefficient of intermediate roll bending force and work roll bending force is determined based on their regulate capability. Practical application shows that precision of the bending force presetting model has improved significantly by adaptive learning.

Design of a Semi-Real Simulation Platform for the Cold Rolling Mill

2013 ◽  
Vol 395-396 ◽  
pp. 1243-1247
Author(s):  
Gang Zheng ◽  
Bin Ma ◽  
Zhe Yang ◽  
Ding Liu
Keyword(s):  
Control System ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Rolling Force ◽  
Milling Process ◽  
Simulation System ◽  
Simulation Platform ◽  
Cold Rolling Mill ◽  
Online Data ◽  
Simulation Results

We designed a semi-real simulation platform for the cold rolling mill that was composed of Simulation Computer, Simulation System of Field Signal, AGC Control System, Console of Rolling Mill and the Main Control Computer, and built the mathematical models in the Simulation Comuter, for the hydraulic servo system, rolling force and thickness of strip material. In the platform, the Simulation System of Field Signal output the simulation data as standard sensor signal; the AGC Control System is the same as that used in real rolling mill system. We simulated the milling process of real rolling mill system at this platform using the field-recorded online data. The differences between simulation results and those in real system were small. Simulation results show that this simulation platform can be used in the research and optimization of rolling mill control system.

Analysis of Contact Pressure between Rolls under Non-Symmetrical Roll Bending of UCM Cold Rolling Mill

2010 ◽  
Vol 145 ◽  
pp. 80-86
Author(s):  
Xu Li ◽  
Dian Hua Zhang ◽  
Peng Fei Wang ◽  
Wen Xue Zhang
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Cold Rolling Mill ◽  
Slowing Down ◽  
Roll Bending ◽  
Comprehensive Information ◽  
Roll Wear ◽  
Flatness Control ◽  
Traditional Work

. For UCM cold rolling mill, the intermediate roll shifting can enhance the ability of mill for better flatness control, but it will increase the non-uniform distribution of pressure between rolls, as result of a reduced roll life. In order to improve the contact state among rolls in rolling processes and to slow down the roll wear, the distribution of pressure between rolls under different forms of roll bending control has been calculated and analyzed by the influence function method in this paper. For the purpose of obtaining comprehensive information, not only the distributions of pressure between rolls with traditional work roll symmetrical bending and intermediate roll symmetrical bending have been analyzed, but also the distributions of pressure between rolls with non-symmetrical roll bending have been analyzed. All the analyses show that the work roll non-symmetrical bending as well as the intermediate roll non-symmetrical bending can play an important role in the slowing down of roll wear.

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