Research On Multi-domain Coupling Modeling And Simulation Of Vehicle Active Stabilizer System Based On Modelica

Vehicle Active Stabilizer System is developed on the basis of the traditional passivestabilizer bar.As a new type of stabilizer bar systerm,it can significantly reduce thedegree of vehicle roll on corners and effectively improve the safety and comfort of thecar.This thesis mainly in the form of hydraulic excitation active stabilizer bar as theresearch object,which included hydraulic,mechanical and control system.The study ofthis type of system can’t ignore the influence of the coupling effect between multiplesubsystems for the performance of the whole system.With the increasing complexity ofsystem,it is difficult to sovle current problems with the traditional individual-domainanalysis tools.Therefore,the objective of this paper is to use Modelica language tool todevelop a generic model which contains hydraulic,mechanical and control model thatcan save time and materials in the development of the follow-up system.First,through the modular division theory is functionally divided the system intomodules with different hydraulic system,mechanical system,control system ect.Thusfacilitating the idea of modular modeling to establish the corresponding module,andalso convenient to modify the model,which greatly enhances the applicability of themodel.Then,the corresponding mathematical model are established according to theprinciples of module partition.In the mechanical system,mainly based on the materialproperties of multi-rigid-body modeling method to establish the mathematical model ofthe stabilizer bar.In the control system,mainly according to the vehicle body roll modelto establish the corresponding mathematical model.During modeling of the hydraulicsystem,the nonlinear effects such as damping coeffient,throttle coeffient,turbulentflow,liquid iductance,liquid capacity and so on are considered to build thecorresponding mathematical model.Then,according to the mathematical model to establish the corresponding simulationmodel by the Modelica lauguage in the simulation platform MWorks.The establishedmodel has generality and reusability,it can be very convenient to modify parameters tosimulate different systems.Finally,by combin the established each subsystem to build the multi-domain couplingvehicle active stabilizer bar system,and simulation.By simulation the different runningconditions,analysis of the hydraulic cylinder piston displacement, and through the comparison with the experimental data to verified the accuracy of the simulation model.By comparing the hydraulic cylinder displacement with the traditional Ansys loadtransfer coupling method of analysis,we can see the advantage of coupling of multidomain physical system modeling based on Modelica language,thus we provide a newcoupling analysis method for ASB system of vehicle.