Study On The Optimal Design Of Vibration Absorbing Composite Structure Based On Foams

As a simple structure and easy to install,the vibration absorber is widely used in the vibration control of various industrial production activities.The advantage of the shock absorber is that it does not affect the working environment of the controlled system,only the additional subsystems are changed,However,the traditional dynamic vibration absorber can only control the vibration of the vibration system at a single frequency,and the additional subsystem has a narrower range of vibration frequency control for the vibration system.In this paper,a composite vibration absorbing specimen with various structures based on three different foams was prepared.The vibration response of composite specimens with different structures and the vibration absorption of steel strips by composite specimens were studied.Conduct research to achieve the purpose of broadening the vibration absorption band.This article will be discussed in the following three sections:Firstly,the thickness of the elastic layer and the thickness of the mass layer are used as variables.The vibration response of the single-layer composite vibration-absorbing specimen itself and the influence of the specimen on the vibration absorption performance of the steel strip were analyzed.Taking the vibration absorption amount as the evaluation standard of the vibration absorption performance of the composite vibration absorbing structure,the law of the vibration absorption and the vibration absorption frequency of the single layer composite vibration absorption specimen were studied.After testing and found that the thickness of the elastic layer is the same,the optimal vibration absorption effect occurs when the elastic layer thickness of the A-type single-layer composite vibration absorption sample is 15 mm,and the vibration absorption amount is 5.31 dB.When the thickness of the mass layer is the same,the optimal vibration absorption effect occurs when the mass layer thickness of the A-type single-layer composite sample is 12 mm,and the vibration absorption amount is 6.75 dB.Secondly,the vibration response test analysis of the double-layer composite vibration absorption specimen and the vibration absorption performance test analysis of the composite specimen on the steel strip are carried out.Taking the thickness of the elastic layer and the thickness of the mass layer as variables,the variation of the natural frequency of the steel strip on the steel strip and the natural frequency of the steel strip on the steel strip were investigated.After testing,it was found that three kinds of response peaks appeared on the double-layer vibration-absorbing composite sample of the three types of foam,and the two-layer composite vibration-absorbing sample with the change of the thickness of the mass layer showed two valley values.When the thickness of the mass layer is the same,the optimal vibration absorption effect occurs when the mass layer thickness of the A-type double-layer composite specimen is 12 mm,the first-order vibration absorption is 4.22 dB,and the second-order vibration absorption is 6.18 dB.Finally,The vibration absorption effect of the A-type composite vibration-absorbing specimen was optimized.The variation of the mass layer in the upper layer sample,the change of the mass layer in the left layer sample in the single layer composite sample,and the change of the elastic layer in the left side sample in the single layer composite sample were studied separately.Based on the vibration response,the variation of the vibration absorption of the steel strip and the valley frequency of the steel strip were studied.After testing,it was found that no matter how the mass layer and the elastic layer of a single sample were replaced,the steel bar only showed a valley value.