Abstract
The dynamicp erformance and more accuracy is mandatory in mill industry according to demand of steel rolling quality. The phenomenon of torsional vibration is ubiquitous in rolling mill system, while the mill is just rolling steel or is blocked which the load disturbance impact.The torsional vibration not only threats the mill's normal work, but also affects the quality of steel strip, and reduces the endurance life of its drive system. So how to reduce or eliminate the torsional vibration is a difficult question of research now.
Considering torsional vibration causing by rolling perturbation, model predictive control is applied to rolling mill system. The constraint condition is porposed to meet manipulated variable constraint. The optimization problem with linear inequalities can be solved by Quadratic Programming. The simulation results show that the design improves the dynamic performance and suppress torsional vibration causing by rolling perturbation. The model predictive control suppresses rolling perturbation.
Key words: rolling mill; torsional vibration suppression; two-mass system;
目 录
摘要……………………………………………………………………………………1
Abstract………………………………………………………………………………..2
0引言………………………………………………………………………………….3
1绪论……………………………………………………………………………….....4
1.1轧机传动机电振动问题的提出……………………………………………...4
1.2轧机传动对电气传动系统的要求……………………………………………7
1.2.1轧机传动的要求……………………………………………….……...7
1.2.2轧制工艺对传动系统技术性能的要求………………………….…...7
1.3轧机传动机电振动控制技术的发展………………………….……………...8
2轧机传动系统扭振产生的机理…………………………………………………..14
2.1扭转振动现象的概述………………………………………………..…….....14
2.2轧机振动现象频发原因和特征………………………………………..….....14
2.2.1轧机振动现象频发原因………………………………….……….....14
2.2.2轧机扭振型式和基本特征……………………………….………......15
2.3轧机扭振现象……………………………….……………………………......15
2.3.1负载变化引起的扭振现象…………………………….…………......15
2.3.2其他情况下的扭振现象……………………….…………………......17
3传动系统的动力学模型………………………………………………………....21
3.1概述……………………………………………………………………….......21
3.2轧机传动系统的模型…………………………………………………….......25
4轧制扰动对电气传动系统的影响…………………………………………….28
4.1轧制扰动的动态速降现象……………………………………………………28
4.2轧机电气传动系统的双闭环控制……………………………………….......30
4.3双闭环控制系统的轧制扰动过程分析………………………………….......32
5外扰负荷观测器控制系统………………………………………………….......36
5.1外扰负荷观测器控制基本原理………………………………………….......36
5.2轧机扰动外扰负荷观测器控制系统………………………..………….......39
结束语………………………………………………………………………………..42
谢辞…………………………………………………………………………………...43
参考文献…………………………………………………………………………….44