含金属塑性流动界面的复杂系统动力学研究

Vibration of rolling mill severely affects the surface quality of rolling strip. It induces greatly economic loss. The dynamic properties of rolling interface are relational to the technical parameters, which have the deciding effect to the vibration of the rolling mill. Based on a great deal of the spot experiments, this project has studied the correlated rule of the dynamic properties of the rolling mill and the technical parameters. The oddity phenomena of self-excitation vibration are discovered on the highly speed rolling mill in some condition. Tribology, dynamics, the plastic flow on the rolling interface are studied. The dynamic model of the rolling interface is founded. The property of negative damping of the rolling interface is discovered. The mechanism of negative damping is uncovered. Hereon these elements, the dynamic model of the rolling mill is founded. The root of inducing self-excitation vibration is uncovered. It provides the theory foundation for improving the surface quality of the rolled strip.

金属塑性流动界面是系统产生自激振动的根源，其动力学特性与工艺参数密切相关。本项目拟综合运用系统动力学、薄膜润滑等理论，结合现场试验，建立参数变尺度、强弱耦合并存的复杂系统设计及界面动特性的动力学模型，分析其稳定性，研究自激振动与工艺参数相关规律，为提高系统稳定性，改善金属带材表面质量提供理论依据。