Research On Fluid-solid Interaction Finite-Element(FE) Simulation And Experimental Verification Of Magnetorheological Fluid Mount

With the constant development of the engine performance and improvement ofpeople’s requirements of car’s comfort, the vibration characteristics of the car engineand the vibration isolation technology can not meet the needs of people. Researchingand developing excellent performance mount has became one of the research areas ofthe major automobile manufacturers.This dissertation discusses some contents New Magnetorheological(MR)Hydraulic Mount with power-train semi-active mount researching which comes from aenterprise project. With magneto-rheological semi-active control hydraulic mount asthe researching object, the MR hydraulic mount structure, damping mechanism,modeling and simulation methods, the mount static characteristics and dynamiccharacteristics are deeply calculated. The research contents are summarized as follows:Firstly,development and characteristics of hydraulic mount is introduced, theresearch status of hydraulic mount at home and abroad is concluded by the relevantliterature summarizes. To study the modeling methods of hydraulic mount. MRhydraulic mount is a special hydraulic mount. Now its simulation are based on the bondgraph theory to establish the mathematical model to simulate. The application offluid-structure interaction finite element method, this paper is the first to attempt tosimulat the vibration isolation performance of MR hydraulic mount.Secondly, fluid-structure interaction finite element theory is deeply studied.Itsmathematical formula is derived. The working mechanism of the magnetorheologicalfluid(MRF) is introduced, the fluid-structure interaction finite element simulation ofMR hydraulic mount bases on MRF. Rubber main spring is the main components of theMR hydraulic mount. Due to the super-elastic rubber, non-linear characteristics, toaccurately describe the constitutive relation of the rubber material is one of the prioritiesof the modeling. This article deeply explores the research methods and constitutivecurve method of the rubber material.Then apply fluid-structure interaction finite element method to make simulationanalysis on the performance of magneto-rheological hydraulic mount. To simplifiedfinite element structure of the magnetic-rheological hydraulic mount, establishthree-dimensional solid model and fluid model. Calculate and analyses the static anddynamic characteristics of suspension, the pressure distribution of upper and lower liquid chamber and inertia channel, and flow velocity distribution of inertia channel andsome internal features’ change rule etc. Aim at the different structure parameters andwhether load currents, make a parametric study to the magneto-rheological hydraulicmount. Simulate the influences of the suspension structure parameters on the propertiesof vibration isolation, and provide the theoretical guidance for optimization of thefollow-up magneto-rheological hydraulic mount.Finally, make a performance experiment to magneto-rheological hydraulic mounton MTS test bench system. The experimental analysis results show that themagneto-rheological hydraulic mount’s fluid-solid coupling finite element simulationtechnology have a good simulation of the vibration isolation performance of thesuspension; Length and cross-sectional area of inertia channel and the main rubberspring stiffness have a significant effect to the vibration isolation performance ofmagneto-rheological hydraulic mount; In this paper, the design of the vibration isolationperformance of the magneto-rheological hydraulic mount is superior to the originalordinary hydraulic mount.