Vibration Control Of Boring Bar With Linear Dynamic Vibration Absorber And Nonlinear Energy Sink

With the development of industry,the quality of boring machining workpiece is more and more high.Boring is one of the main ways of hole processing.Vibration generated during boring will reduce the quality of the workpiece,serious damage to the tool,reduce the tool life.Therefore,it is very important to suppress the vibration of boring bar when machining workpiece.This thesis focuses on the boring bar system with additional linear dynamic vibration absorber and nonlinear energy well.The main contents include:(1)The vibration control of linear boring bar system under harmonic excitation by parallel nonlinear energy sink of linear dynamic vibration absorber is studied.The forced vibration of linear boring bar system is studied and the approximate analytical solution of the system is obtained by means of average method.The accuracy of the approximate analytical solution is verified by comparing the amplitude-frequency response curves of the numerical solution and the analytical solution.The stability of steady solution and phase plan of boring bar system are analyzed.The influence of parameters of linear dynamic vibration absorber and nonlinear energy sink on vibration control of linear boring bar system is analyzed.The parameters of linear dynamic vibration absorber and nonlinear energy sink are optimized respectively by the analytical solution of H∞ optimization and approximate analytical solution ergodic method,and the optimization effects of these two optimization methods are compared..(2)The vibration control of nonlinear boring bar system under harmonic excitation by parallel nonlinear energy sink of linear dynamic vibration absorber is studied.The forced vibration of nonlinear boring bar system is studied and the approximate analytical solution of the system is obtained by means of average method.The accuracy of the approximate analytical solution is verified by comparing the amplitude-frequency response curves of the numerical solution and the analytical solution.The stability of steady solution and phase plan of boring bar system are analyzed.The influence of parameters of linear dynamic vibration absorber and nonlinear energy sink on vibration control of nonlinear boring bar system is analyzed.The parameters of linear dynamic vibration absorber and nonlinear energy well are optimized by nonlinear extension of equal-peak method and approximate analytic solution traversal.By comparing the nonlinear extension of the equal-peak method,and traversing the analytical solution and approximate analytical solution of H∞optimization,the optimal optimization parameters and results are obtained.(3)The vibration control of linear boring bar and linear boring bar system under harmonic excitation by linear dynamic vibration absorber series nonlinear energy sink is studied.The forced vibration of nonlinear boring bar system is studied and the approximate analytical solution of nonlinear boring bar system is obtained by means of average method.The accuracy of approximate analytical solution is verified by numerical solution.The stability of steady solution and phase plan of boring bar system are analyzed.The influence of parameters of linear dynamic vibration absorber and nonlinear energy sink on vibration control of nonlinear boring bar system is analyzed.The results show that the vibration control effect of linear dynamic vibration absorber series nonlinear energy sink on nonlinear boring bar and linear boring bar system is better than linear dynamic vibration absorber parallel nonlinear energy sink.