Isolation Analysis And Design Of Powertrain Mounting Systems

With the requirements of the vehicle to improve comfort, vibration and noise becomes one of themost important indicators in automotive design.The engine is one of the largest oscillator resources invehicle. Powertrain mounting systems whose performance will directly affect the vehicle’s noise,vibration and harshness (NVH) performance is as isolation system between the powertrain and thebody. When the basic parameters of the powertrain and vehicle have been confirmed, design thestiffness, damping and the installation location and set powertrain mode natural frequency of the orderin reason, to ensure a higher mounting system degree of modal decoupling which not only can reducethe maxmum vibration from the powertrain to the body but also improve reliability of mountingsystem.Based on the six degrees of freedom dynamic model of engine mounting system, the inherentcharacteristics, vibration decoupling and vibration isolation characteristics are analyzed. Throughtheoretical and experimental analysis, we generate the engine force. The methods of measurepowertrain inertia parameter are analyzed are compared.We get the physical parameters of powertrainwith the torsion pendulum method. Also the impact of errors is considered. In order to consider themounting bracket of local stiffness of the natural frequency of the powertrain, the five degrees offreedom and fifteen degrees of freedom model is established respectively to analyze the inherentcharacteristics with computer simulation. The evaluation indicators of powertrain mounting systemare analyzed. Finally, single-objective and multi-objective optimization method is used to optimizethe powertrain mounting system.There is the reference significance to automobile powertrain mounting system design with thestudy in this thesis.