Simulation Research Of The Matching And Optimization On Vehicle Powertrain Mounting System

The powertrain is one of most important vibration source of vehicle. The powertrain mounting system plays an important role in to vehicle body/frame and effects directly on the performance of Noise and Vibration. Many factors contribute the performance of the And there are interaction effects between those factors. So it is hard to satisfy the whole requirement of the powertrain mounting system only through optimize parameters of one mount. Therefore,It's important to understand the factors' essentiality by studing the mounts'effect on the powertrain mounting system's matching performance based on the result of optimization.The result not only can provide a rule to design the powertrain mounting system's parameter,but also can adjust the parameter prompt.The vibration can be better isolated, research period can be shorten and the cost can be reduced.Firstly,the six degree of freedom mathematical model of the powertrain mounting system is created by lagrangian method based on the analyse and systemic dynamics.And then optimizate the powertrain mounting system aimed the high energy decoupling. The result shows that the free frequency can avoid the frequency range of the road and wind.It also shows that the energy decoupling of main Vibration direction is improved.Secondly, the multi-factor experiment is exerted for each mount's different engine mount's stiffness. First make a orthogonal design and analyse to each mount. The range analysis method was applied to analyze the experimental result.The result indicates that the left mount's stiffness in vertical direction exerts great impact on system's energy decoupling of direction X,Z,β.For the right mount, the longitudinal exerts great impact on system's energy decoupling of all direction.For the back one, stiffness in vertical direction exerts great impact on system's energy decoupling of direction X,Z,α,γ.Finally, a orthogonal experimental design considerd all the mounts'factors and their interacti- -on effects is designed.The simulation result is analysed by range analysis method. The result indicates that the left and right mount's stiffness in x direction exerts great impact on system's synthetically energy decoupling. The factors' direct effects on system's synthetically energy de- -coupling is 2.77 times than the interaction one.The top five factors'(included interaction effects) extreme difference on the direction accounted respectively for 42.22%,56.9%,56.27%,43.12%,75.67%,71.8% of all factors'. And the bottom five factors'(included interaction effects) extreme difference on the direction X,Y,Z,αβ,γaccounted respectively for 4.61%,0.4752%,0.1836%,5.0118%,0.7024%,0.9486% of all factors'.