Optimisation of geometry and material properties of a non-pneumatic tyre for reducing rolling resistance Online publication date: Thu, 30-Oct-2014
by Mallikarjun Veeramurthy; Jaehyung Ju; Lonny L. Thompson; Joshua D. Summers
International Journal of Vehicle Design (IJVD), Vol. 66, No. 2, 2014
Abstract: The effect of geometric and material parameters of a non-pneumatic tyre (NPT) on overall performance of the NPT is investigated. Parametric studies, design of experiments (DOE), and sensitivity analyses are conducted with a hyper-viscoelastic finite element model to determine effects of design variables: i) the thickness of spokes; ii) the shear band thickness and iii) shear modulus of polyurethane (PU), on rolling resistance, vertical stiffness, and contact pressure. A response surface model is generated from DOE and is used to find optimum design values for minimising rolling resistance of an NPT under constraints on vertical deflection and contact pressure. Shear modulus of PU and the shear band thickness are the most important design parameters to affect rolling resistance, vertical stiffness, and contact pressure. The optimised values show that the NPT has low rolling resistance with a higher shear modulus of PU and a higher shear band thickness associated with a lower shear deformation while rolling.
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