Looper-tension <Emphasis Type="Italic">H</Emphasis><Subscript>∞</Subscript> control for hot strip finishing mills

The development of an innovative H _∞ controller for looper and tension control in hot strip finishing mills is traced based on approximately linearized model. This solution has been considered thanks to its well-known robustness and simplicity characteristics concerning disturbances’ attenuation. The controller is designed based on an optimal problem with linear matrix inequality (LMI) constraints, and the problem is solved by the mincx function of Matlab LMI Toolbox. Simulation results show the effectiveness of the proposed controller compared with conventional ones.     

RESEARCH ON THE DYNAMIC MATHEMATICAL MODEL OF REHEATING FURNACE

Introduction　　With the increasing global competition amongsteel companies,the enhancement of productivityof the process has become an essential task to sur-vive and succeed in the world trade market.Due tothe energy consumption of furnaces accounting fora large percent in steel plants,it has been a trendto improve the heating quality of slab in the fur-nace and reduce the energy consumption as can aspossible. Owing to:(a) the many different typesof slabs to be processed,(b) the strong intera…     

总结经验，努力开拓公路工程监理工作的新局面

本文从实践出发，围绕如何做好监理工作做了四个方面的阐述。     

浅谈桥涵混凝土外观质量缺陷预防措施

本文对桥涵混凝土外观存在的质量缺陷进行了原因分析,并结合施工的实际情况,通过在原材料、配合比设计、模板、施工工艺等方面采取相应技术措施,达到提高混凝土外观质量的目的。