Simulation Of Vehicle Ride Comfort And Optimization Of Suspension Parameters Based On ADAMS

Vehicle ride comfort is one of the most important factors, which influences comfort. On the other hand, it is one of the most important indices determining the vehicle whether have advantage in the market competition. Furthermore, with the development of technology, the dynamics analysis software is widely applied in vehicle's design and manufacture and etc.The ADAMS software based on the theory of multi-body dynamics is used to carry out simulation analysis of vehicle dynamics. In product design stage, the prediction and evaluation of vehicle ride quality is an important means, which contributes to improve product design quality and reduce product development costs.Firstly, the dissertation expounds the basic theory of ADAMS software. The main functions and characters of the modules of ADAMS are also introduced. Aiming at home-made car, UG software was used to acquire the accurate geometry parameters and mass property parameter of the subsystems. On this basis,The ADAMS was used to build up an assembled vehicle model, which includes front and rear suspensions, chassis, steering, tires subsystems and etc. Among them, the rear suspension built up is a complex and special suspension of longitudinal arm with tortile spring, analyzing the rule of positioning parameters in the wheel travel through kinematic simulation, and confirming the rationality of the rear suspension initiatorily.Furthermore, the vehicle virtual prototype model has been assembled in ADAMS/Car module and verified in ADAMS/View. A 4-post virtual prototype test rig of the whole vehicle model based on ADAMS/Ride has been built by the writer. The simulation of ride comfort in different kinds of speed and variable road input has been realized, and the ride comfort of the vehicle has been evaluated according to the international standard ISO 2631-1:1997(E). The road test was carried out referring to GB/T 4970-1996 and then by comparing the road test result with simulation, the result indicated the model is proved to be correct.Finally, the dissertation optimizes the suspension parameters such as the stiffness and damper according to similar D-Optimal design. Regarding the root mean square value of driver's acceleration as target, the experiment optimization design was carried out to lower the value. The optimization improves the vehicle ride comfort after the optimized parameters of the suspension applied in the simulation.