Research On Torsional Vibration Characteristic Analysis And Control Of Rolling Mill Shaft Based On Torsional Vibration Damper

With the development of society and the continuous progress of science and technology,intelligent mechanical devices have higher and higher requirements for steel precision,and people are paying more and more attention to the vibration problems in the working process of rolling mills.The torsional vibration phenomenon of the rolling mill shaft system seriously affects the quality of the rolled products.In order to obtain a method to suppress the rolling mill vibration,scholars have explored the torsional vibration behavior of the rolling mill shaft system from multiple levels.Consequently,so as to improve the accuracy of the rolling process and the stability of the rolling mill equipment,this paper studies the vibration characteristics and stability control of the rolling mill shaft system with torsional vibration damper.First of all,aiming at the torsional vibration behavior of the rolling mill shaft system,this paper considers the damping effect of the torsional vibration damper,and establishes a torsional vibration suppression model for the rolling mill shaft system containing the torsional vibration damper.At the same time,the dynamic equation of the rolling mill shaft system is established according to the D'Alembert principle.Through simulation experiments,study the characteristic law of the amplitude ratio response curve of the main drive system of the rolling mill shaft system under different damping ratios.According to the optimization design of fixed-point theory,the best inertia ratio,best tuning ratio and best damping ratio between the torsional vibration damper and the rolling mill shaft system are obtained.Calculate and reason out the moment of inertia,torsional stiffness and damping value of the torsional vibration damper.Secondly,based on the above-mentioned torsional vibration suppression model and dynamic equation of rolling mill shafting,the multi-scale method is used to solve the amplitude frequency response of the main and internal resonance of the system,and the amplitude frequency response equation of the system under the consideration of two resonances is obtained.Simultaneously,according to the structural parameter data of a1780 strip rolling mill,the amplitude-frequency characteristics of the main drive system of the rolling mill shaft system under the influence of its own parameters and the basic parameters of the torsional vibration damper are simulated and analyzed,and the rolling mill shaft system before and after the torsional vibration damper is installed.Domain characteristics and spectral characteristics.Finally,considering the stability of the rolling mill shaft system with torsional vibration damper,a neutral time-delay feedback control function is introduced to establish a rolling mill shaft torsional vibration suppression model with time lag torsional vibration damper.The multi-scale method is used to analyze the perturbation of the rolling mill shaft system,and the vibration characteristic equation of the rolling mill shaft system considering the main and internal resonance is obtained.The stability theory is used to analyze the stability of the torsional vibration damper and rolling mill shaft system after introducing the time-delay feedback control function,and solve the system stability interval under the time-delay feedback control.Numerical simulation verifies that the neutral time lag torsional vibration damper has a certain time lag adjustable area and can effectively control the stability of the rolling mill shaft system.Furthermore,it provides a theoretical reference for studying the stability of rolling mill shaft system with torsional vibration damper.