Research On Virtual Matching Of The Flexible Spoke Non-Pneumatic Tire And Vehicle Performance

As the only part of the vehicle in contact with the road surface,the tire has an important impact on the driving performance of the vehicle.With the continuous improvement of people’s requirements for the vehicle driving safety performance,the problem of the traditional pneumatic tire blowout and puncture becomes increasingly prominent,making the non-pneumatic tire technology become an important research direction to improve vehicle driving safety.In this paper,a new flexible spoke non-pneumatic tire is studied for its virtual matching with the key performance of the whole vehicle by building a tire model based on its mechanical characteristics under multiple working conditions.The main research contents are as follows:Firstly,the mechanical characteristics of the flexible spoke non-pneumatic tire under multiple working conditions are investigated.The three-dimensional model and numerical analysis model of the flexible spoke non-pneumatic tire are constructed.The validity of the model is validated statically and dynamically through the prototype test,and the convergence of the finite element model mesh is verified.The static basic mechanical characteristics of the flexible spoke non-pneumatic tire are studied,including the static stiffness and grounding characteristics.The steady state mechanical characteristics simulation of the flexible spoke non-pneumatic tire under pure longitudinal slip,pure lateral slip,pure camber and compound conditions are completed,and its steady state mechanical characteristics curves are obtained,and compared with the steady state mechanical characteristics curves of the same size pneumatic tire.Then,based on the mechanical characteristics data of the flexible spoke non-pneumatic tire under multiple working conditions,its mechanical theoretical model is constructed using the Pac2012 tire model.The modeling mechanism of the Pac2012 tire model is introduced,and the tire model parameters are identified under each working condition.The significance of the tire scaling factor in Pac2012 model is analyzed,and the influence of different scaling factors on the lateral mechanical characteristics of the flexible spoke non-pneumatic tire is studied.The mechanical simulation model of the flexible spoke non-pneumatic tire is built based on Simulink,and the joint simulation model is built by connecting with the Carsim vehicle model for the vehicle handling and stability simulation.Next,The virtual matching research of the flexible spoke non-pneumatic tire and vehicle handling stability is carried out.According to the national standard,three representative working conditions of the vehicle handling and stability tests are selected,and the virtual simulation tests are carried out using the flexible spoke non-pneumatic tire and the vehicle joint simulation model.Based on the simulation test results,the vehicle handling and stability is analyzed and evaluated according to the national standard.The Isight/Matlab/Carsim joint simulation platform integrating the tire scaling factor is built.Through this sensitivity analysis platform,the influence of the lateral mechanical characteristics of the flexible spoke non-pneumatic tire on the vehicle handling and stability index score is studied.Based on the particle swarm optimization algorithm,the lateral mechanical characteristic factors that affect the handling and stability of the whole vehicle are reasonably optimized.Finally,Completed the virtual matching research of the flexible spoke non-pneumatic tire and vehicle ride comfort.The SWIFT tire model,which can describe the dynamic response characteristics of flexible spoke non-pneumatic tire to uneven road surface,is constructed,including the equivalent road surface model and the rigid ring model.The equivalent road height and inclination angle are obtained through the simulation of the low-speed envelope characteristics of the flexible spoke non-pneumatic tire,and the equivalent road model is constructed based on the tandem elliptical cam.The dynamic force response curves of the wheel center are obtained through the simulation of the dynamic mechanical characteristics of the flexible spoke non-pneumatic tire,and the dynamic model of the rigid ring is built based on the parameters of the rigid ring model.The connection between the SWIFT model and the Carsim vehicle model is completed,and the ride comfort of the vehicle matching the flexible spoke non-pneumatic tire is simulated,analyzed and evaluated according to the national standard.The influence laws of vertical characteristic parameters on vehicle ride comfort is studied through orthogonal tests.