Virtual Prototyping Development And Simulation Of Roewe750 Fuel Cell Vehicle Chassis

In this thesis, a virtual prototyping model of new energy vehicle Roewe750 FCV chassis system is developed within ADAMS/Car environment. Dynamic simulations of handling and stable characters of suspension and the entire car are carried out, along with related evaluation of simulation results according to national standard. Focused concentration is on developing the template of Roewe750 FCV independent rear multi-link suspension with double wishbones and one trailing arm.According to multi-body system dynamics principles, the general template of Roewe750 FCV independent rear multi-link suspension with double wishbones and one trailing arm is developed on the basis of analyzing the structural and mechanical properties of Roewe750 FCV independent rear multi-link suspension. Then Roewe750 FCV rear suspension subsystem is established with related parameters, such as hardpoint coordinate, part's mass property, spring property, absorber property and bushing property. The parallel wheel travel analysis of rear suspension is simulated by assembling rear suspension subsystem with suspension test rig. According to simulation results, the changing rules of rear wheel toe angle, camber angle, roll center location under rear wheel motion are analyzed. At the same time, Roewe750 FCV independent front suspension subsystem is established through applying the Macpherson suspension template and the parameters of Roewe750 FCV independent front suspension. Then the parallel wheel travel analysis of front suspension is simulated by assembling front suspension subsystem with suspension test rig. According to simulation results, the changing rules of locating parameters of front wheel against front wheel motion are analyzed.After the establishment of Rowe750 FCV front and rear suspension subsystems, the virtual prototyping models of body, steering, tire, and flexible antiroll bar subsystems are developed in the third chapter. Then the entire virtual prototyping model is realized by assembling all the subsystems. According to GB/T6323-94 controllability and stability test procedure for automobiles and ISO double-lane test procedure, the simulated tests of Roewe750 FCV, such as steady circular test, steering wheel step input and impulse input tests, ISO double-lane change test, are performed using the entire car model. Besides, the simulation results are evaluated according to industrial standard QC/T480-1999.Finally, the suspension matching analysis to the new energy vehicle Roewe750 FCV is performed, aiming at solving the problem of reduced ground clearance and the change of controllability and stability caused by the increased weight of Roewe750 FCV. The analysis and evaluation of whole vehicle handling and stability based on ADAMS/Car software prove that the whole virtual vehicle after suspension matching has satisfied handling and stability. Later on, the lightweight design of Roewe750 FCV front antiroll bar was carried out. Then the proof on strength, torsional stiffness and fatigue of this design was implemented. More importantly, through the comparative analyses of handling and stability of the entire car model with original front antiroll bar and lightweight front antiroll bar, based on virtual simulation on handling and stability using ADAMS/Car, it is demonstrated that the lightweight design of front antiroll bar has hardly influence on the handling and stability performance of the whole vehicle.