Research On Performance Simulation And Experiment Of Automobile Power-train Magneto-rheological (MR) Mount

The ride comfort and safety of automobile are paid more close attention, and it canbe concluded from the development trend of international automobile industry and thereality of improving speed in road traffic conditions. All above is because of theautomobile consumer goods’ distinguished effect in maintaining people living andboosting national economy.This dissertation discusses some contents New Magneto-rheological Fluid Mountwith power-train semi-active mount researching which comes from a enterprise project.Based on the comprehensive analysis works of course of development of power-trainmount at home and abroad, classification, status quo, existing problems and scope ofapplication of the new magneto-rheological material, the basic theoretical research,structural design, simulation and test research are investigated on automobilepower-train semi-active mount employing the magneto-rheological fluid to solve somelimitations of mount. The main contents are as follows:Firstly, based on the ideal dynamic characteristics of MR mount, and withreference to structural model of ordinary hydraulic mount, two kinds of MR mountdesign models are put forward, which come from pre-consideration of overalldimension, structure rationality and reliability. The method of determining the relativeparameters is studied, considering material on the mount performance to determine thematerial selection of the mount parts.Secondly, aiming at the magnetic path structure of a new power-train MRsemi-active mount, the interior magnetic field of structure is carried out with the help ofthe electro-magnetic fields module of software ANSYS. The main works are achieved,which included the magnetic field distribution of MR mount of different structure andthe corresponding response under different current incentive. Combining the theory ofelectro-magnetic field theory knowledge validation, the results of finite element analysisprovide a potent reference for subsequent structural design of mount.Thirdly, the lumped-parameter mechanical modal and the bond graph mathematicalmodel of power-train MR mount are established by using bond graph theory, and thedynamic characteristic equation with the corresponding parameters is derived. Theperformance simulation work of MR mount’s dynamic characteristics is completed byusing MATLAB programming tool, as well as the simulation study of the structural multi-parameters.Finally, the MTS bench test study of multi-parameters of power-train MRsemi-active mount is presented in this paper. The influences of incentive amplitude,experiment materials, liquid, inertia track on the MR mount are introduced in this paper,as well as the contrast analysis on dynamic performance between MR mount withordinary hydraulic mount provided by the research cooperation. The study resultsindicate that: MR mount has non-linear performance, and the performance of MRF isimportant to the dynamic performance of MR mount; MR mount has different dynamiccharacteristics in different incentive amplitudes condition, and MR mount in lowfrequency and large amplitude condition is more effective to attenuate vibration thanthat in high frequency and small amplitude condition; The changes of the inertia trackparameters cause the peak mutations and peak frequency of the dynamic performance tobe changed. The proper adaption of structure parameters of the inertia track can conducethe more ideal dynamic performance, thus the system vibration, noise andtransmissibility are decreased.