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Modeling, estimation, and control of...

Ahn, Seokyoung.

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Modeling, estimation, and control of electroslag remelting process.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Modeling, estimation, and control of electroslag remelting process./
Author:	Ahn, Seokyoung.
Description:	193 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1122.
Contained By:	Dissertation Abstracts International66-02B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3165096
ISBN:	0542010321

Modeling, estimation, and control of electroslag remelting process.
Ahn, Seokyoung.

Modeling, estimation, and control of electroslag remelting process. - 193 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1122.

Thesis (Ph.D.)--The University of Texas at Austin, 2005.

Electroslag Remelting (ESR) is used widely throughout the specialty metals industry to produce superalloy and special steel cast ingots. High quality ESR casting requires that the electrode melting rate be controlled at all times during the process. This is especially difficult when process conditions are such that the temperature distribution in the electrode has not achieved, or has been driven away from, steady state. This condition is encountered during the beginning and closing stages of the ESR process and also during some process disturbances such as when the melt zone passes through a transverse crack. To address these transient melting situations, a new method of ESR melt rate control has been developed that incorporates an accurate, reduced-order melting model to continually estimate the temperature distribution in the electrode. The related state variables are estimated by the observer algorithms. Due to the highly nonlinear characteristics of the process, more sophisticated estimators than the Kalman filter are proposed. The unscented Kalman filter (UKF) based on the unscented transform and the particle filtering technique were chosen for possible candidates and applied in the controller design. During the highly transient periods during melting, the UKF showed the best performance for controlling the melt rate. Particle filtering can deal with non-Gaussian noises and the accuracy is totally based on the number of the Monte Carlo runs. Unfortunately, the particle filter is relatively slow in the real-time applications for controlling the ESR process with current computer technology.

ISBN: 0542010321Subjects--Topical Terms:

783786
Engineering, Mechanical.

Modeling, estimation, and control of electroslag remelting process.
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035 $a (UnM)AAI3165096
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100 1 $a Ahn, Seokyoung. $3 1935933
245 1 0 $a Modeling, estimation, and control of electroslag remelting process.
300 $a 193 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1122.
500 $a Supervisor: Joseph J. Beaman.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 2005.
520 $a Electroslag Remelting (ESR) is used widely throughout the specialty metals industry to produce superalloy and special steel cast ingots. High quality ESR casting requires that the electrode melting rate be controlled at all times during the process. This is especially difficult when process conditions are such that the temperature distribution in the electrode has not achieved, or has been driven away from, steady state. This condition is encountered during the beginning and closing stages of the ESR process and also during some process disturbances such as when the melt zone passes through a transverse crack. To address these transient melting situations, a new method of ESR melt rate control has been developed that incorporates an accurate, reduced-order melting model to continually estimate the temperature distribution in the electrode. The related state variables are estimated by the observer algorithms. Due to the highly nonlinear characteristics of the process, more sophisticated estimators than the Kalman filter are proposed. The unscented Kalman filter (UKF) based on the unscented transform and the particle filtering technique were chosen for possible candidates and applied in the controller design. During the highly transient periods during melting, the UKF showed the best performance for controlling the melt rate. Particle filtering can deal with non-Gaussian noises and the accuracy is totally based on the number of the Monte Carlo runs. Unfortunately, the particle filter is relatively slow in the real-time applications for controlling the ESR process with current computer technology.
590 $a School code: 0227.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0548
690 $a 0743
690 $a 0794
710 2 0 $a The University of Texas at Austin. $3 718984
773 0 $t Dissertation Abstracts International $g 66-02B.
790 1 0 $a Beaman, Joseph J., $e advisor
790 $a 0227
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3165096