Study On Dynamic Modeling And Model Validation Of Rubber Damper

The all-round development of high-speed railway technology has promoted social progress and improved people's living standard.At the same time,it also puts forward higher requirements for the stability and ride comfort of the high speed train.As a kind of common vibration absorber in trains,the performance of rubber damper has an important influence on the vibration transmission of the whole vehicle.However,the nonlinearity of material increases the difficulty of finite element modeling of rubber structure,and the uncertainty of material enlarges the error of system response prediction.Therefore,it is necessary to establish a model that can accurately describe the mechanical characteristics of rubber damper and to analyze the uncertainty of the model.Static characteristic model of rubber material is the basis of establishing dynamic characteristic model,and it also has an important impact on vehicle ride comfort.The static and dynamic modeling theory of rubber material are introduced first in this paper,and the application scope of different models is analyzed,and the expression of model parameters is discussed.Then a rubber damper of high-speed trains is taken as the research object,from the description method of static characteristics of rubber material,through the comparison between linear elastic model and hyperelastic model,for the damper model provides a reasonable solution.The method of obtaining model parameters and the characteristics of different validation criteria in uncertainty analysis are discussed emphatically.On this basis,method of dynamic characteristic modeling of rubber material is studied,then the hyperelastic-viscoelastic model is used to describe the preloading and frequency-dependent characteristics of material,and the validity of parameter and modeling method are verified by sweeping frequency experiment.The response of the vibration absorber system is predicted by imitating the loading condition of the rubber damper in the actual working condition,and the finite element model which can reflect the dynamic characteristics of the real damper is obtained.Finally based on the theory of linear elastic model,the hypothesis of equivalent Young's modulus is proposed and verified by modal test.The dynamic characteristic parameters of rubber damper is identified by excitation experiment,which provides data support for the equivalent modeling of rubber dampers in the whole vehicle modeling process and explains the rationality of the hypothesis of equivalent modulus.