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논문 기본 정보

자료유형
학위논문
저자정보

정다운 (포항공과대학교, 포항공과대학교 철강대학원)

지도교수
원상철
발행연도
2013
저작권
포항공과대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (2)

초록· 키워드

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In hot rolling processes, the rough rolling process is an essential step for making the medium size bar for final strip products. After rough rolling, the bar usually has longitudinal bending called camber owing to several reasons. Camber should be reduced because it may cause various problems including clogging of finishing mill and strip edge folds. The difficulties to designing a camber-reducing controller are to have a good mathematical model of the rolling process and, consequently, lack of an appropriate validation scheme of the designed control algorithm before applying it to a real system. In this thesis, a three-dimensional simulator for the rough rolling process using FEM (Finite Element Method) is constructed. An output feedback fuzzy controller that does not require a mathematical model is then designed to reduce camber including the lateral bar movement called side-slipping by tilting the roll. A FEM simulation combined with the proposed controller is carried out to show the effectiveness of this scheme. The results show that camber and side-slipping can be effectively reduced while achieving a reasonable wedge profile.

목차

1 Introduction 1
1.1 Introduction 1
1.2 Thesis overview 6
2 Mathematical Model of the Hot Rolling Mill 8
2.1 Basic model 8
2.2 Roll model 10
2.3 State space representation 11
3 Main Results 13
3.1 Construction of 3D FEM simulator for rough rolling process 13
3.1.1 Construction of FEM simulator 15
3.1.2 Generation of test bars 16
3.1.3 Camber measurement 17
3.2 Output feedback fuzzy controller design 17
3.2.1 Interval type-2 fuzzy control 18
3.2.2 Design of camber-reducing algorithm 18
3.3 Simulation 22
4 Model Applications for the Finishing Mill 33
4.1 Observer based H2/H1 Control for Steering of Lateral Moving Strip 33
4.1.1 Introduction 33
4.1.2 Problem description 34
4.1.3 Observer based H2/H1 controller design 36
4.1.4 Simulation results 41
5 Conclusions 44
한글 요약문 49

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