Simulation And Analysis Of The Ride Comfort For All-Terrain Vehicle Based On Virtual Prototype Technology

The traditional product design is a repeated and circulatory process of prototypetrial-manufacture, test evaluation and feedback design. During the every circulation of the process, the physical prototype needs to be rebuilt or modified, causing the extended product developing period and higher cost. With the development of the multi-body-dynamics and the widely use of computer, it enabled the virtual prototype to be developed for entire machine.Ride comfort is one of the main performances for All Terrain vehicles. Based on the theories of the multi-body-dynamics and finite element method, researching on a 400 ATV a company produced, the main parts of the ATV and a body model reflecting the mass distribution of the body was built in UG, then the three-dimensional full model of ATV was built after assembling those parts. After imported 3d full model into ADAMS with required format, a multi-rigid-body dynamics model of the ATV in ADAMS was built. The MNF of the frame was imported into ADAMS after doing the modal analysis of the frame for replacing the rigid frame to build the multi body dynamics model integrated the flexible frame. Grade B road file in ADAMS were created for riding comfort test according to the method of superposition of harmonic wave in MATLAB. The engine exciting was analyzed and then the simulation for engine exciting in ADAMS was achieved. Considered engine exciting and road roughness, riding comfort simulation of the multi-rigid-body dynamics model and the multi body dynamics model integrated the flexible frame were carried out. The results of the two models were contrasted in frequency domain. It also were analyzed and evaluated using riding comfort evaluation programme created before, and the evaluated results of the two models were contrasted. The ride comfort tests of ATV on the road were carried out according to the national standards. The results of experiments had some differences from the simulation, but there whole trends were consistent. By contrasting, the flexibility of the frame had some influences for the ride comfort. Regarding the frame as a flexible part was closer to the fact, but the difference was little. Compared with the rigid model, the model integrated flexible frame had higher accuracy, and the results of the simulation had better worthwhile.Aiming at low frequency vibration of ATV caused by road surface roughness, the parameters of front and rear suspensions and the seat suspension were studied by the method of orthogonal experiment, the results indicated that the influence of damping of the front and rear suspensions to the seat and handle vibration were biggest, the influence of the stiffness and damping of the seat suspension were bigger, the reaction of the front and rear suspensions could not be neglected.