Fluid-structure Interaction Simulation Analysis And Structural Optimization Of Engine Hydraulic Mount

With the rapid development of China's automobile industry and the improvement of our life standards,the ride comfort is required more and more strictly.Improving the vibration characteristic of vehicles is the key influential factor of the ride comfort.The performance of Power-train Mount acts a crucial role on vehicle ride comfort because vehicle vibration mainly results from engine excitation and road excitation.The inverse method of rubber material parameters,accurate calculation method of dynamic performance of hydraulic mount,optimization method of hydraulic main spring structure based on fatigue life are mainly discussed in this paper.Firstly,the development process and characteristic of the engine mount is introduced,the research status of hydraulic mount at home and abroad is concluded by the relevant literature summary.A method of using single objective genetic algorithm to solve the material parameter of Mooney-Rivlin constitutive model is proposed based on static characteristic test data of hydraulic mount rubber main spring.The Latin hypercube experiment method is adopted to extract the sample points in the design space for numerical simulation.The response surface model is established and the rubber material parameters are inverted by using the single objective genetic optimization algorithm in the vertical direction.Secondly,with the quick development of computer technology,numerical analysis method has become a main tool to solve engineering problems.The dynamic analysis of hydraulic mount is deeply studied in this paper and the fluid-structure interaction theory based on ALE is also introduced.Dynamic simulation analysis of engine hydraulic mount based on fluid-structure interaction finite element method.Thirdly,the structure and working principle of the hydraulic mount are studied by using the hydraulic engine mount with inertia track and uncoupling membrane.According to the physical hydraulic suspension,this paper draws CAD model,uses the finite element software HYPERMESH to divide solid and liquid mesh and imports them into the analysis software ADINA with structural material parameters and boundary conditions of fluid-structure interaction.The performance of the hydraulic mount is simulated.The experiment of the decoupling membrane hydraulic mount of the inertial channel are carried out.The results show that the finite element method is feasible to analyze the hydraulic mount,and the simulation method provide the theoretical guidance for the design of the hydraulic mount.Finally,the fatigue life of the rubber main spring is taken as a constraint because the structure of the rubber main spring is very important to the fatigue life of hydraulic mount.The structure of rubber main spring is optimized on the basis of static analysis to meet the requirements of life,eliminate design risk and reduce product development cycle.