Research On Static And Dynamic Characteristics Of Engine Mount Considering Rubber Creep

Under the long-term load,the engine mount will produce creep phenomenon,its structural size will decrease with the increase of time,and the final creep value will tend to change gently.The creep of the mount will change its original structure,resulting in changes in its static and dynamic characteristics and fatigue life.In order to better grasp the variation law of the static and dynamic characteristics of engine mount,the potential influence of creep on engine mount should be considered at the beginning of design.In this paper,the influence of rubber creep on the static and dynamic characteristics of engine mount is studied,which can provide reference for improving the vibration isolation performance of the whole vehicle and help for the creep research of other rubber components.On the basis of studying the influence of creep on the static and dynamic characteristics of mount,the change of Mount fatigue life caused by rubber creep is also studied,which can provide a basis for the study of high mileage performance degradation of the whole vehicle.Therefore,it is of great significance to study the influence of rubber creep on the static and dynamic characteristics of engine mount.In this paper,the right mount(hydraulic mount)of a vehicle’s transverse four cylinder engine is taken as the research object,and the static and dynamic characteristics of the mount are studied by using the finite element simulation analysis method.Uniaxial tensile tests were carried out on rubber dumbbell specimens.Combined with several commonly used rubber hyperelastic constitutive models,the parameters were fitted in ABAQUS software.The fitting results are compared with the test data,and the constitutive model with the best fitting effect is finally selected to provide parameter preparation for the subsequent static and dynamic characteristics and creep analysis of the mount.According to the working principle of hydraulic mount,the fluid structure coupling model is established in HyperMesh software,and the static and dynamic characteristics of engine mount are analyzed by ADINA software.At the same time,the static stiffness test of the mounting sample is carried out.Combined with the simulation results,the correctness of the model is verified.Through the obtained material parameters,based on the creep mechanism of rubber,the influence of different loads on the creep of suspension is studied.In this paper,several common rubber creep models are introduced firstly.Combined with the static viscoelastic parameters of rubber,the creep analysis of mount is carried out in ABAQUS software.Through different load loading,the change law of Mount creep is studied.The results show that the creep of the mount is greatly affected by the load.Based on the creep of engine mount,the influence of different degrees of creep on the static and dynamic characteristics of engine mount is studied.According to the definition method of fluid structure coupling model,the fluid structure coupling model of engine mount after creep is established,and the static and dynamic stiffness is calculated in ADINA.The results are compared with the static and dynamic stiffness without creep,and the hysteresis loop of force and displacement is drawn;Combined with the project content and practical engineering problems,the fatigue life of the mount is also a key consideration in the development process of the mount.According to the research method of fatigue life of rubber materials,the influence of rubber creep on the fatigue life of engine mount is analyzed.The results show that rubber creep has a great influence on the static and dynamic characteristics and fatigue life of engine mount.