Optimization Design Technology Of Multi-frequency Dynamic Vibration Absorber

In certain conditions,the vibration level of the component parts of the aircraft is often greaterthan the design value.This situation will seriously affect the structure’s life and the drivers’s health.Ifengineers redesign the dimension of these vibratinal structure,its mass distribution and stiffnessdistribution changed,and the vibration level of the whole structure can be changed.However,thismethod of redesign is always very costly and time consuming.An economic and necessary approachto reduce vibration is to attach dynamic vibration absorber in the orginal structure.This paper studies an optimization method which is suitable for dynamic vibration absorber’sdesign.First,according to the basic theory of vibration absorbers,determine the size of masscomponent and elastic component by calculating the resonant frequency of the structure which needto reduce vibration.Then,design the dynamic optimization for the coupling structure which consists ofthe absorber and the main structure.Determine the mechanical model of the dynamic optimization byselecting the appropriate optimization algorithm and the objective function.Build an optimizationplatform by using matlab software,get absorber parameters which meet the designrequirements.Third,this paper designs an dynamic vibration absorber for a cabin structure of theaircraft.Compared the damping efficiency before and after optimization,analyze the damping effect ofthe total structure by using absorber,discuss the influence of the position of the absorberefficiency.Finally,we design a test piece of dynamic vibration absorber and do experiments by using it.Exprimental results demonstrate the reliability of the simulation caculations of the dynamic absorber.