The Research Of Mill Vertical-torsional Coupling Vibration Control Based On A Diagonal Matrix Decoupling Method

Rolling mill,as an important modern processing equipment in metallurgical industry,hasimportant significance for strip production. Vibration of rolling Rolling mill,as an importantfactor to restrict the yield and quality of strip, severely reduces the efficiency of production,in order to ensure the efficient and safe operation of rolling mill, to improve the surfacequality of strip rolling mill, improve the yield, vibration problems have been graduallygaining the researchers’concern.Vibration of high rolling mill is mainly composed of torsional vibration of main drive system andvertical vibration of the base, There is inevitably coupling between the two. Therefore, decoupling controlmethod research of the mill vertical and torsional coupling vibration system has important theoreticalsignificance and practical application value. in this paper,we analyzed the induced vibration mechanism ofthis vibration for two kinds, two forms of vibration dynamics models are built, we analyzed thecharacteristics of rolling deformation zone parameters, set up vibration model invertical-torsional ofRolling mill coupling, decoupling suppression vibration control using diagonal matrix method, and carriedon the simulation, the main work is as follows:(1) using the lumped mass method, introduced the main forms of vertical vibration of theRolling mill:three octave and five octave of vertical vibration, two kinds of vertical vibrationwere conducted dynamic analysis, summarized the common causes of two kinds of verticalvibration. Established a multi-degree of freedom dynamics model of vertical vibration Rollingmill, analyzed the natural frequency and vibration mode of vertical vibration; set up a singledegree of freedom model of rolling mill.(2) the structure of main drive system of rolling mill was introduced, and the multi-degree of freedomlumped mass model of main drive system of rolling mill was established, derived the relationship betweenmulti-degree of freedom model with two degrees of freedom model, Transformed multi-degree of freedommodel into two degrees of freedom system connected through an elastic shaft, between motor and roller,and analyzed the stability. We established the Rolling mill main drive control system model andcalculated of the response of the system In the condition that the main drive system of rolling mill workunder step loading and ramp loading.(3)for rolling process of important parameters of rolling force and rolling torque through the rollerseam deformation zone of the coupling problem, based on the analysis of deformation frictioncharacteristics and roll gap characteristics by applying the principle of virtual work, through vertical andtorsional coupling stiffness constructed mill vertical and torsional coupling dynamic model.(4) using the modern control theory, transformating the mill vertical and torsional coupling dynamicmodel tor the state space model, analyze its controllability, observability and stability. By using the methodof diagonal matrix decoupling, researching the coupling control method of vertical torsional vibrationsystem of rolling mill. The simulation results show that the decoupling control effect is obvious, thevertical and torsional vibration have been effectively suppressed.