Motor Train Cab Active Suspension Dynamic's Modeling And Computer Simulation

Motor train cab is a new railway technique which integrates high-speed, quick,comfortable etc as a whole. It represents the future directions of the development of therailway. In this dissertation, the active suspension system of motor train cab wastheoretically derivated and summered, and offered theory basis for further research ofthe active suspension system's control part and other related products.Lagrange's equations and Newton's laws were separately used to build thesystem's vibration model. Newton method was used to build thetwo-degree-of-freedom model of 1/4 car and Lagrange's equation was used to build thefour-degree-of-freedom model of 1/2 car. The dynamic equations were gottenrespectively in addition to use the state space to express it. Track irregularity and otherrelevant factors were considered, gained the Active Suspension actuator's outputdisciplinarian and simulated the traditional passive suspension's characteristic curve,as well as afford the reference for the following computer simulations. And theactuator's law of motion or the controller's output disciplinarian gained from theoptimal control theory as well as analysis it reason.3D modeling software Solidwork used to build solid model of motor train cab,for the purpose to observe every parts' assemble condition. Simulation softwareMSC.Adams/Rail was used to build dynamic simulation models. Analysis systematicthe basic template creation process, steps and the basic principles of modeling methods.And describe detailed on the steps of using MSC.Adams/Rail build motor train cab'smodel, from wheel set to suspension, and add accessory at the same time, till acomplete assemble was finished. It provides the necessary conditions for the systemdynamics simulations.Perform dynamic simulation by using the former model, gained the figures of car body centroid's acceleration, velocity, displacement; bogie centroid's velocity anddisplacement; front and back wheel set's vertical, lateral and longitude's force. Andmade comparations with the Matlab's curves, gained conclusion that model whichformer built was reliable. And add actuator to form the active suspension, simulated ittoo, and reached a series of curves. Make compares on the two times analysis, tofinally reach a conclusion: motor train cab active suspension can effectively improvethe dynamic behaviors.