Study and development of on-line dynamic control simulation software for a medium and thin slab continuous caster

2015 ◽  
Author(s):  
K. Liu ◽  
Q. S. Li ◽  
L. H. Feng ◽  
B. Wang
Keyword(s):  
Continuous Caster ◽  
Dynamic Control ◽  
Simulation Software ◽  
Thin Slab ◽  
Control Simulation ◽  
On Line ◽  
Slab Continuous Caster

scholarly journals Combined Effects of EMBr and SEMS on Melt Flow and Solidification in a Thin Slab Continuous Caster

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 948
Author(s):  
Changjun Wang ◽  
Zhongqiu Liu ◽  
Baokuan Li
Keyword(s):  
Continuous Caster ◽  
Solidification Rate ◽  
Potential Method ◽  
Suppressive Effect ◽  
Thin Slab ◽  
Dispersion Effect ◽  
Melt Flow ◽  
Simultaneous Application ◽  
Iron And Steel ◽  
Slab Continuous Caster

Electromagnetic fields have emerged as powerful tools for addressing current problems in thin slab continuous casting processes in the iron and steel industry. Substantial studies have been undertaken on the fundamental effects of electromagnetic brakes (EMBr) and strand electromagnetic stirring (SEMS). However, little attention has been focused on melt flow and solidification in a thin slab continuous caster with the simultaneous application of an EMBr and SEMS. The present study aimed to predict transient fields in the caster using a large eddy simulation and an enthalpy-porosity method. The electric potential method was applied in the braking process, and the conductivity change with solidification was considered. The suppressive effect on the intensity of the nozzle jet, the balance effect on the mold flow, and a dispersion effect could be observed. The dispersion effect was a novel finding and was beneficial to a flatter nozzle jet. In contrast, SEMS caused a highly turbulent flow in the strand. A large vortex could be observed in the casting direction. The solidified shell became more uniform, and the solidification rate became obviously slower. These findings supported the view that a high-quality thin slab can be produced by the application of an EMBr and SEMS.

scholarly journals Physical simulation of liquid steel motion in a thin-slab continuous caster mold

2019 ◽  
Vol 75 (4) ◽  
pp. 454-459
Author(s):  
V. M. Safonov ◽  
V. G. Borisevich ◽  
V. V. Kislitsa ◽  
D. V. Morov
Keyword(s):  
Liquid Steel ◽  
Steel Casting ◽  
Physical Simulation ◽  
Continuous Caster ◽  
Dead Volume ◽  
Mold Surface ◽  
Thin Slab ◽  
Direct Flow ◽  
Deep Layers ◽  
Slab Continuous Caster

Industrial experience of steel casting at the thin-slab continuous caster (CC) revealed processes, having negative effect on the quality of internal structure and surface of CC thin slab. The main problems are as follows: flat streams of liquid steel, flowing through submerged snorkel into restricted dead volume, form circulating flows of extremely high velocity in both liquid core and on the slab surface. This circumstance makes specific requirements to the design and parameters of the submerged snorkel to supply the metal into the thin-slab CC mold. Despite the more than 25 years’ experience of the snorkel form and geometric parameters development, there is no single opinion on its optimal design. Results of physical simulation of the liquid motion processes in a thinslab Caster mold presented (for slab maximum width 1800 mm, thickness – 90 mm) of JSC “Vyksa Steel-works” casting and rolling complex. Description of the physical model facility quoted, as well as description of the experiment methodology and its results. The speed was measured and structure of liquid steel flows revealed in depth and sub-surface layers, as well as in slag-forming mixture at the mold surface. The comparison of two principally different variants of liquid steel feeding into the mold made. The two variants were as follows: by a flat down-directed stream with a narrow central divider (direct-flow submerged snorkel) and by four streams , two of them directed down under an angle relating the vertical axe, and the other (about 20% of total liquid consumption) – directed upward to the bath mirror (the snorkel of “hammer” type). It was determined, that steel casting with technological speed through the direct-flow snorkel was most effective into the slab of 1400 mm width and less, since in this case the sub-surface flows speed did not resulted in the intensive waves formation, constant whirls formation and slag particles dragging into deep layers of the slab. For steel casting into slab of width more than 1400 mm, it is reasonable to use a snorkel of the “hammer” type, which enables to create a favorable stable structure of circulation and decrease the tendency of slag particles dragging in the deep layers of the slab.

Mathematical Modeling of Transport Processes in Funnel Shaped Mold of Steel Thin Slab Continuous Caster

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
A. Hajari ◽  
S. H. Seyedein ◽  
M. R. Aboutalebi
Keyword(s):  
Flow Pattern ◽  
Casting Speed ◽  
Continuous Caster ◽  
Transport Processes ◽  
Inlet Temperature ◽  
High Heat Flux ◽  
Thin Slab ◽  
Surface Turbulence ◽  
Submergence Depth ◽  
Slab Continuous Caster

In this work a three-dimensional fluid flow and heat transfer model was developed to predict the flow pattern and superheat dissipation in funnel shaped mold of a thin slab continuous caster with a novel tetrafurcated design for the submerged entry nozzle. Low Reynolds k−ε turbulent model was adopted to account for the turbulent effect. The transport equations were solved numerically using finite volume method. The results were compared with a full scale water model of the caster. Good agreement between mathematical and physical models was obtained. Parametric studies were carried out to evaluate the effect of casting speed, nozzle submergence depth, and inlet temperature on the superheat dissipation, flow pattern, and surface turbulence in the mold region. The results indicate a special flow pattern and heat distribution in the caster while using a tetrafurcated nozzle. Aiming to achieve more product capacity, in the case of casting with lower superheat temperature, a higher casting speed, together with higher submergence depth, is recommended in order to avoid surface turbulence and high heat flux across the narrow face.

Design of Robust Approach for Failure Detection in Dynamic Control Systems

2013 ◽  
pp. 237-259
Author(s):  
Gomaa Zaki El-Far
Keyword(s):  
Nuclear Power ◽  
Dynamic Control ◽  
Control Process ◽  
Failure Detection ◽  
Global Optimum ◽  
Sampling Time ◽  
Nuclear Power Reactor ◽  
Control Actions ◽  
On Line ◽  
Simulation Results

This paper presents a robust instrument fault detection (IFD) scheme based on modified immune mechanism based evolutionary algorithm (MIMEA) that determines on line the optimal control actions, detects faults quickly in the control process, and reconfigures the controller structure. To ensure the capability of the proposed MIMEA, repeating cycles of crossover, mutation, and clonally selection are included through the sampling time. This increases the ability of the proposed algorithm to reach the global optimum performance and optimize the controller parameters through a few generations. A fault diagnosis logic system is created based on the proposed algorithm, nonlinear decision functions, and its derivatives with respect to time. Threshold limits are implied to improve the system dynamics and sensitivity of the IFD scheme to the faults. The proposed algorithm is able to reconfigure the control law safely in all the situations. The presented false alarm rates are also clearly indicated. To illustrate the performance of the proposed MIMEA, it is applied successfully to tune and optimize the controller parameters of the nonlinear nuclear power reactor such that a robust behavior is obtained. Simulation results show the effectiveness of the proposed IFD scheme based MIMEA in detecting and isolating the dynamic system faults.

On-line bulging and shear measurements near the straightening point in a continuous caster

1999 ◽  
Vol 96 (6) ◽  
pp. 729-736
Author(s):  
M. van Rossum ◽  
C.L.A. Delicaat ◽  
R. Mostert ◽  
J. Vermeij ◽  
E.J.G. Spelbos
Keyword(s):  
Continuous Caster ◽  
On Line

A Jupyter Notebook Environment for Multibody Dynamics

2020 ◽  
Author(s):  
Aaron Gaut ◽  
Jonathan Cameron ◽  
Abhinandan Jain
Keyword(s):  
Modeling And Simulation ◽  
Multibody Dynamics ◽  
Flexible Multibody Dynamics ◽  
Training Needs ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Engineering Applications ◽  
Topic Area ◽  
Significant Extension ◽  
On Line

Abstract DARTS is a rigid/flexible multibody dynamics toolkit for the modeling and simulation of aerospace and robotic vehicles for engineering applications. In this paper we describe an on-line, browser-based environment using Jupyter notebooks to support training needs for the DARTS software. The suite of curated tutorial notebooks is organized into different topic areas, and into multiple themes within each topic area. The notebooks within a theme use a progression of examples for users to expand their understanding of the software. The topic areas include one on the DARTS multibody dynamics software and another one on the theory underlying the multibody dynamics formulation. We also describe a number of Jupyter extensions that were used — and some developed in house — to enhance the notebook interface for use with the dynamics simulation software. One significant extension we implemented allows the embedding of live 3D visualizations within simulation notebooks.

Development and evaluation of a glucose analyzer for a glucose controlled insulin infusion system ((Biostator).

1978 ◽  
Vol 24 (8) ◽  
pp. 1366-1372 ◽  
Author(s):  
E J Fogt ◽  
L M Dodd ◽  
E M Jenning ◽  
A H Clemens
Keyword(s):  
Blood Glucose ◽  
Whole Blood ◽  
Insulin Infusion ◽  
Full Range ◽  
Dynamic Control ◽  
On Line ◽  
The Moment ◽  
Glucose 6 Phosphate Dehydrogenase ◽  
Blood Glucose Concentrations ◽  
Infusion System

Abstract The Glucose-Controlled Insulin Infusion System (Biostator) is a modular, computerized, feedback control system for dynamic control of blood glucose concentrations in diabetics. This on-line glucose analyzer for use with whole blood utilizes a novel enzyme (glucose oxidase)-membrane configuration and an electrochemical cell to measure the H202 generated. The analyzer exhibits both short- and long-range stability, and instrument response and analyte concentration are linearly related over the full range of clinical interest. The response is fast, accurate, and precise, and permits determination of blood glucose within 2 min from the moment the blood leaves the patient. Correlation studies were completed to show the agreement between the Biostator Glucose Analyzer and the FDA's recommended hexokinase/glucose-6-phosphate dehydrogenase procedure on whole blood (e.g., average per cent recovered for 11 concentrations between 250 and 900 mg/liter was: hexokinase, 95.6%, Biostator Analyzer, 95.9%; bias and SDd, respectively, at low, normal, and high glucose values were: 12 and 41 mg/liter at the 500 mg/liter level; 4 and 52 mg/liter at the 1000 mg/liter level, and 4 and 128 mg/liter at the 4000 mg/liter level). No appreciable interference is observed with above-normal concentrations of bilirubin, uric acid, creatinine, sodium salicylate, or dextran. Platelet adhesion, which tends to decrease the useful life of the membrane, has been significantly decreased.

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