| Most of the current mainstream shock absorbers can only bear the load in one direction,and in some situations where the force is more complicated and there are vibration damping requirements in multiple directions,ordinary shock absorbers cannot meet the use requirements.With the rapid development of EMUs in China,the complex stress situation of EMU trains requires a shock absorber that can have the bearing capacity in the three directions of axial,vertical and horizontal to meet the stability of its operation.Rubber shock absorbers have excellent vibration damping and damping properties and are widely used in vibration damping systems.However,in the design process,it was found that it is not easy to take into account the performance of the wedge-shaped rubber shock absorber in three directions.It must be modified many times to design a wedge-shaped rubber shock absorber that meets the performance requirements in three directions at the same time.In this paper,the experimental study of the wedge-shaped rubber shock absorber is carried out by the finite element method,and the simulation results of the wedge-shaped rubber shock absorber are analyzed with the help of the finite element tool.At the same time,the relationship between the three-dimensional rigidity of the wedge-shaped rubber shock absorber was studied.Finally,an artificial neural network model is used to construct a prediction model between the experimental factors and the three-dimensional rigidity of the wedge-shaped rubber shock absorber.The main work done in this article is as follows:1.Through searching a large number of relevant documents at home and abroad,the research status of the constitutive model of rubber materials,the design methods and optimization methods of rubber shock absorbers were fully studied,and the research objectives and research programs were determined.2.Through the research on the damping mechanism of rubber materials and the performance requirements of wedge-shaped rubber shock absorbers,the principle of using finite element technology to assist the structural design of wedge-shaped rubber shock absorbers is proposed.3.According to the research on the mechanism of rubber shock absorber,the vibration damping material of the shock absorber is selected as natural rubber,and three kinds of natural rubber are selected for experiments.Through the study of the rubber constitutive model,the relevant rubber The material constitutive model was verified.4.The structure design of the wedge-shaped rubber shock absorber was carried out through orthogonal experiments,and the finite element simulation of the orthogonal experiment combination was carried out through finite element software.The rubber hardness,rubber layer thickness,inclination angle and metal plate were studied and analyzed through the simulation results.The effect of the quantity on the performance of the wedge-shaped rubber shock absorber,and the optimal parameter combination is determined.5.According to the finite element simulation results,the influence of each factor on the three-dimensional stiffness of the wedge-shaped rubber shock absorber is studied,by which the relationship between the three-dimensional stiffness of the wedge-shaped rubber shock absorber is analyzed,and it is proposed The design method of the stiffness performance.6.By studying the characteristics and principles of BP artificial neural network,the data of finite element simulation was used to establish the relationship between the rubber hardness,the thickness of the rubber layer,the inclination angle and the number of metal plates and the three-dimensional rigidity of the wedge-shaped rubber shock absorber.The prediction model was verified.And through the training model to assist the design of wedge-shaped rubber shock absorber. |
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