Design And Research Of A Variable Mass Self-tuning Dynamic Vibration Absorber

The vibration and noise problem of complex mechanical structure system after installation is difficult to be solved by structural redesign.The installation of dynamic vibration absorber is an effective method to solve the vibration problem,adding dynamic vibration absorber to the main system to eliminate or greatly reduce the vibration of the main system.The traditional dynamic vibration absorber can only achieve vibration and noise reduction in a single or narrow situation,but in a complex external environment,the range of excitation frequency causing vibration and noise is usually wide,so it is of great significance to broaden the vibration absorption band of the dynamic vibration absorber.In this paper,a kind of dynamic vibration absorber which can realize wide-band vibration absorption is studied.By adjusting the mass of the dynamic vibration absorber to change its natural frequency,the vibration attenuation of the main vibration system can be realized in a wide frequency range.This is a kind of universal variable mass shock absorber for the vibration of mechanical equipment.The main research contents are as follows:(1)Based on the Single degree of freedom vibration theory,the two degrees of freedom undamped dynamic vibration absorber and damped dynamic vibration absorber are studied,and the influencing factors affecting the vibration absorption effect of the dynamic vibration absorber are analyzed.On this basis,the principle and implementation method of the variable mass dynamic vibration absorber are studied.(2)Design the control algorithm to realize the continuous variable quality of the dynamic vibration absorber,and effectively realize the absorption of the main vibration system.Fourier transform is used to accurately extract the external excitation frequency,neural network algorithm is used to calculate the optimal quality,using PID control pump pipe model to realize liquid quality transportation,PID parameters are determined by trial and error method,and then the genetic algorithm is used to optimize the PID control parameters.The control algorithm is simulated and analyzed based on MATLAB/Simulink.(3)An experimental system platform was designed to verify the effectiveness of the variable quality control algorithm,and the vibration of the main vibration system with and without the dynamic vibration absorber was compared and analyzed to verify the effectiveness of the variable quality control algorithm.