Study On The Dynamic Simulation Of Double Railway Automation Vehicle

Double Railway Automation Vehicle is a kind of advanced and efficientmachine, which has not been developed in China, since not long before.When China FAW Group set about projecting Double Railway AutomationVehicle for the electrophoresis product line, as a result of the equipment'sexpensive and complex, the engineers find it difficult to achieve the work byexperience. So it is necessary for a dynamics simulation of the Double RailwayAutomation Vehicle to study based on the virtual prototyping technology.Firstly, three-dimensional modeling of Double Railway Automation Vehicle ismade by parametric methods based on feature technology.The whole equipment isvirtual assembled.With parametric technology it's easy to modify the model forimprove the design.The virtual prototype of Double Railway Automation Vehicle is built based onADAMS, which has 59 moving parts, 33 contact force, 58 Joints (1 cylindrical, 52Revolute Joints, 4 Fixed), and 65 degrees of freedom.Simulation is executed to getcurves of velocity and acceleration,etc.The origin designed equipment is a bit unstable at the arc part during thesimulation course.The slope is avoided by amending of the design, and theimprovement has been validating in later simulation.Numerical analysis of contact-impact is one of the most complex problems indynamic simulations. The modeling of contact-impact has an effect on thesimulation efficiency. It is discussed in this paper on how to solve thecontact-impact problems in multi-body systems.In ADAMS, a nonlinear spring damping contact model is applied to imitatethe contact-impact force. The expression is below:So the tangential friction can be calculated as:Fτ = fFn =f??? kge+step( g,0,0,dmax,cmax)?ddgt???The formula mentioned above is not suitable for the simulation of DoubleRailway Automation Vehicle, for the friction in the equipment is prefer some kindof persistent contact to impact contact. Therefore, Binomial Friction Law is appliedto calculating friction force along tangent.This method has involved in adherenceand impact.So it is easy to parameterize the friction by change the material orroughness of the contact surfaces. The friction force expression based on BinomialFriction Law is below:Fτ = fN=αAr +βN=2α lr2?(r ?e)2 +βNSupplementarily, finite element analysis is performed on some important partsto checkout the design result.Importantly, advice is given to improve the design forsecurity.The design of rail curvature and engine by dynamics simulation study isapplied to the real product,that is the purpose of the simulation.To the product of Double Railway Automation Vehicle, the simulationconclusion is helpful to reduce the cost of the exploiture process and it is alsouseful to other railway automation equipments alike.