Neuro-Fuzzy System for Compensating Slow Disturbances in Adaptive Mold Level Control

Guillermo González-Yero,Reynier Ramírez Leyva,Pedro Albertos,Alfons Crespo-Lorente,Juan Manuel Reyes Alonso,Mercedes Ramírez Mendoza

doi:10.3390/met11010056

Guillermo González-Yero, Reynier Ramírez Leyva + Show 4 more

Open Access

https://doi.org/10.3390/met11010056

Copy DOI

Abstract

Good slow disturbances attenuation in a mold level control with stopper rod is very important for avoiding several product defects and keeping down casting interruptions. The aim of this work is to improve the accuracy of the diagnosis and compensation of an adaptive mold level control method for slow disturbances related to changes of stopper rod. The advantages offered by the architecture, called Adaptive-Network-based Fuzzy Inference System, were used for training a previous model. This allowed learning based on the process data from a steel cast case study, representing all intensity levels of valve erosion and clogging. The developed model has high accuracy in its functional relationship between two compact input variables and the compensation coefficient of the valve gain variations. The future implementation of this proposal will consider a combined training of the model, which would be very convenient for maintaining good accuracy in the Fuzzy Inference System using new data from the process.

Highlights

Continuous casting is a process where molten metal is solidified into a semi-finished billet, bloom, or slab for subsequent rolling in finishing mills; it is the most frequently used process for steel casting
The final version of the ANFIS model that will be presented resulted from several changes, training phases and analysis, until the desired system requirements were reached
ANFISmodel modelfor forimproving improvingthe theaccuracy accuracyof ofthe thediagnosis, diagnosis,and and comcompensation of an adaptive method for slow disturbances related to changes pensation of an adaptive mold level control (MLC) method for slow disturbances related to changesof ofthe the stopper stopperrod, rod,isispresented

Summary

Introduction

Continuous casting is a process where molten metal is solidified into a semi-finished billet, bloom, or slab for subsequent rolling in finishing mills; it is the most frequently used process for steel casting. It allows lower-cost production of metal sections with better quality, due to the inherently lower costs of continuous, standardized production of the product, as well as providing increased control over the process through automation [1]. Compensation for MLC slow disturbances such as valve erosion and valve clogging are insufficiently resolved problems

Objectives

Results

Conclusion