Abstract
A static grounding analysis model of non-pneumatic tire (NPT) was built and presented in this paper. The proposed NPT analysis model considers the non-linearity of the spoke stiffness and is suitable for the performance exploration of various structures of the NPT. First, the shear band, rigid rim, and spoke structure of the NPT were simplified, the main structural parameters and mechanical parameters were extracted, and an analysis model was established. The model can describe the deformation of the NPT when it is subjected to external forces. On this basis, the different stiffness of the spokes during tension and compression was considered, an iterative method was used to compensate for the difference in the deformation caused by the difference in radial stiffness of the spokes, and an analysis model of NPT with nonlinear spokes was established. Then, the contact between the tire and the road surface was introduced to iteratively compensate for the reaction force of the road surface, and the deformation of the NPT with nonlinear spokes on the road surface was obtained. Finally, the finite element software ABAQUS was used to verify the accuracy of the model. This model contains more comprehensive structural parameters and material parameters, which can more realistically simulate the structural characteristics and static grounding behavior of the NPT.
Highlights
Compared with traditional pneumatic tires, non-pneumatic tires (NPTs) have a simple structure; they are not prone to puncture, and their design requires less natural rubber usage
From the comparison of the above results, when the tire model with nonlinear spokes contacts the road surface, under different spoke stiffness conditions, the deformation results of the shear band calculated by the analysis model and finite element analysis (FEA) model are in good agreement, and the comparison error of vertical characteristics of the tire is small
Based on the basic structure and deformation characteristics of the NPT, the shear band is simplified into a circular Timoshenko beam
Summary
Compared with traditional pneumatic tires, non-pneumatic tires (NPTs) have a simple structure; they are not prone to puncture, and their design requires less natural rubber usage. An analysis model of NPT with nonlinear spokes was established based on Gasmi’s two-dimensional model This model considered many parameters, including the circumferential stiffness of the spokes and the structural parameters and material parameters of the shear band, able to describe the structural performance of the NPT more accurately. The non-linear radial stiffness of the spoke is set, which is suitable for the performance research of the NPT with various structures, and can be used to calculate the static deformation of the NPT when contacting with the road surface. The outer ring of the NPT (including the shear band and tread) is a component that directly contacts the road surface, with certain tensile properties and shear properties, and it is the main component that determines the tire grounding characteristics. Where R2kθuθ0 is the effect of the circumferential stiffness of the spoke on the NPT and R2krur is the effect of the radial stiffness of the spoke on the NPT
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