| The vigorous development of automobile industry has further improved the requirements of consumers for automobile performance,and put forward higher requirements for the safety,comfort and stability of tires.One during driving,check and maintain pneumatic tires regularly to avoid safety problems,such as tire perforation and steering wheel leakage.In view of the above tire safety problems,this paper studies the tire structure design,basic mechanical properties analysis,fatigue performance analysis,life prediction and other aspects.The main research contents are as follows:Firstly,based on BESO method,the mathematical model of topology optimization of the ring structure of non-pneumatic tire is established aiming at optimizing the minimum flexibility of the non-pneumatic tire.The circular structure of the tire without inflation is optimized.Based on the calculation method of the period of topology optimization of BESO structure,the interpolation function is introduced to reduce the intermediate density element in the optimization process,and the sensitivity of the circular periodic structure is calculated.According to BESO convergence law,the element is suppressed and enhanced,and the design variables are updated.The topology optimization model of non-pneumatic tire circular structure was studied,and the change of topology optimization structure was studied when the cycle number ratio the shape,inner and outer diameters of different circular structures was changed.Secondly,a unit structure design method for diamond non-pneumatic tire is proposed.Aiming at 195/50R16 radial tire,the topology optimization model of three-dimensional sub module of non-pneumatic tire fan was established by using Hypermesh finite element analysis software.The structure of the fan-shaped sub module is optimized,and the optimal topology under different periods,different volume fractions and different grid sizes is obtained.By configuring and normalizing the main force transmission paths of the sub modules of different parameters,several basic non-pneumatic tire structural units are obtained.Each unit combines the same type of infrastructure units and different types of infrastructure units side by side,constructs the corresponding similar combined structural units and different combined structural units.The periodic annular array of the combined structural units is used to construct the non-pneumatic tire with different structural forms.Based on the study of the unit structure of the non-pneumatic tire,taking the X-type basic structure unit as an example,the diamond type non-pneumatic tire is constructed.Thirdly,according to the overall structure characteristics of diamond tire,the 3D geometric model and numerical simulation model of diamond tire are established based on ABAQUS.The static load simulation was carried out,and the basic mechanical properties of non-pneumatic diamond tire were studied.The grid density(number of turns),radial support structure radiation plate thickness,fan support structure tire thickness and other structural parameters are selected to study the influence of these structural parameters on the mechanical performance of the fan.The basic laws of radial stiffness,support stress and tire pressure distribution of diamond tire are discussed.Fourthly,the calculation method of fatigue life of diamond tire was studied,and the influence of structural parameters on the fatigue performance of diamond tire was studied.Based on the simulation of ABAQUS and Fe-safe,the fatigue life of non-pneumatic tire support structure is predicted,the thickness of diamond support plate and the density of fan support plate are modified,and the test results are analyzed.The influence of structural parameters on the fatigue life of diamond type supporting structure is discussed,which provides some theoretical guidance for improving the durability of subsequent non-pneumatic tire. |
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