Characteristics Of Rubber Mount And Its Impact On The Whole ICE's Vibration Analysis

To ensure the power requirements of the engine itself,when the local oscillator is difficult to control,we need to take measures in vibration transmission pathways,such as vibration or vibration isolation and other measures.Powertrain mounting system is a resilient coupling system which can connect vehicle powertrain with frame bracket.It serves isolate engine noise and vibration transmitted to the vehicle body and plays the important role to reduce vibration caused by road roughness transmitted to engine.Thus choosing the proper powertrain mounting system and characterization analysis became an effective and important research direction in reducing vibration noise transfer between the engine and the body.Taking a high intensified diesel and its mounting system as the research object,firstly a high-precision rubber mounting system hexahedral finite element model was established in ABAQUS.Then the super-elastic model was used to study rubber mount static characteristics.Before the Mooney-Rivlin mode was loaded by static force,the reasonable selection of parameters to study the static stiffness of rubber mount is necessary;the superimposed Model of Mooney-Rivlin hyperelastic model with three Prony viscoelastic model was chose to study the dynamic characteristics of the rubber mount.And then it is calculated at the different excitation amplitude and excitation dynamic frequencies.It is found that dynamic stiffness reduces with amplitude decreases and increases with excitation frequency increases.Secondly,the stiffness and damping of the equation changing with the excitation frequency was derived from the single degree of freedom vibration equation.Then a rubber mount dynamic characteristics test was designed and carried out,and the frequency response function experimentally obtained needs to do data processing and curve fitting to give a more reasonable and complete dynamic stiffness and damping characteristic curve.And the simulation results were compared with this experimental result in order to verify the validity of simulation models and experiment.Then,parameters from three-dimensional software and related test were obtained to establish of machine vibration simulation model in GT-Crank.Comparing the standard conditions of machine vibration intensity with the one obtained from engine bench test to verify model.On this basis,it is studied of the effects on the machine vibration by the suspension position.And positional parameters have been optimized by using the combat center theory.Calculation with stiffness and damping changing of the mount was carried out in order to know the influence of the whole engine vibration.It was found that when the excitation frequency is above 200 Hz and its corresponding system stiffness and damping values was put to the model,the machine vibration intensity began reduced.When taking the V-shaped arrangement into account,the results shows that when the axial center of the V-torsion mount falls into the center of inertia,vibration intensity has significantly improved.Finally,considering the above factors,the vibration intensity has considerably been improved and a final optimization has been found.This will provide technical support for future military diesel mount design.