| The requirement of vehicle riding comfort has become increasingly higher for people. As one of the main performance for evaluating the comfort of the vehicle, vehicle riding comfort has got more and more attention by the various auto enterprise, and it has became the important performance index of the automobile products to achieve a competitive market advantage. The better utilization of virtual prototype technology in product design phase, can effectively shorten the product development cycle, reduce development costs, and improve the quality of the design of the products, so the research on vehicle riding comfort by virtual prototype technology is of great significance. In this paper, combining with the development project of a new vehicle product for a heavy truck enterprise, a vehicle virtual prototype model is set up by ADAMS/Car according to the theory of multi-body dynamics, for the riding comfort simulation analysis and optimization research.In this paper, a complete semitrailer tractor model is established in ADAMS/Car, which includes the vehicle power train system, frame system, front and rear suspension system, tire system, cab and mounting system, steering system and the trailer system.The vehicle assembly model is set up by assembling those subsystems together, and it will be used in the subsequent simulation analysis. According to GB/T 4970-《vehicle riding comfort test method》, a stochastic road of class B and triangular pulse road is built, which will be used in the simulation analysis of random road input with the speed of 30 km/h to 90km/h and the pulse road input simulation analysis with the speed of 10 km/h to 60 km/h.The vibration acceleration response curves have been got in X, Y, Z three directions at the three places of cockpit seat, backrest and the floor at the driver’s feet.The frequency spectrum analysis and weighted processing about the simulation results are made, the relationship between the integrated total weighted RMS acceleration and the speed change of the truck is got. The road test of the prototype riding comfort were done, and the test results and simulation results are compared to verify the accuracy of the vehicle model.The seat stiffness, damping, and front and rear suspension damping parameters are optimized on the basis of accurate model. The simulation results of optimized model show that the vehicle riding comfort is improved.
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