Research On Damped-variable Mass Dual Dynamic Absorber And Its Control Plan

Under the action of the control system,the variable mass adaptive dynamic vibration absorber(VM ADVA)can adjust its natural frequency by changing the mass parameter,which can suppress the vibration of the primary system over a wider band.But when the control system does not work or the responsiveness of the control system is not fast enough,the primary system may occurring resonance.In order to reduce the resonance peak of the primary system,in this thesis,a damped-variable mass dual dynamic vibration absorber(D-VM DDVA)and its control plan are proposed.The main research contents include:1.On the basis of studying the basic theory of dynamic vibration absorber,the D-VM DDVA is proposed.The mechanical model of the D-VM DDVA is established and solved.Then the influence factors of the performance of the D-VM DDVA and the phase difference between the absorber and the primary system are analyzed.2.Some commonly used intelligent optimization algorithms are studied.Then the genetic algorithm is used to optimize the parameters of the damped vibration absorber,and the optimization results are analyzed.The results show that the parameter optimization is beneficial to improve the performance of the dual dynamic vibration absorber.Compared with the VM ADVA,the resonance peak of the primary system with the VM ADVA is lower.3.A fuzzy controller of the VM ADVA in dual dynamic vibration absorber is designed.MATLAB/Simulink is used to study the control effect of the controller.The results show that the fuzzy control strategy can make the natural frequency of the VM ADVA in the dual dynamic vibration absorber change with the excitation frequency,and this control strategy has the ability to resist noise interference.The dual dynamic vibration absorber can obviously reduce the resonance peak of the primary system,and its performance is good.4.An experimental platform was built to verify the effect of the control strategy and the performance of the D-VM DDVA.The results show that the control strategy is effective.The D-VM DDVA can reduce the amplitude of the primary system in the process of mass adjustment of the VM ADVA,and has better working performance.