| In rainy weather,traffic accidents caused by cars are much higher than normal.One of the main reasons is the occurrence of water skiing.In order to improve the water skiing performance of tires,ensure personal safety,and reduce property damage,most scholars have carried out research on the influence of structural characteristics on the water skiing performance of tires,and rarely characterize water skiing performance by the characteristics of the fluid domain.Therefore,it is an important technical direction to analyze tire water skiing performance by combining the tire nonlinearity and flow field characteristics.The purpose of this article is to study the numerical simulation analysis method of fluid-structure interaction of tire water skiing,analyze the mechanism of water skiing performance of the tire from the characteristics of the flow field,and propose a pattern structure optimization method to improve the performance of the water skiing.Design and application have important guiding significance.This paper analyzes the related mechanism and influencing factors of the phenomenon of tire water skiing on wet roads.Based on the numerical methods used in the current research process,the control methods and simulation algorithms involved in this research are selected.In this study,a 185/60 R15 vertical tread tire is used as the research object through the ANSYS workbench platform.A tire-pavement shell model is constructed,and its effectiveness is verified by designing the radial stiffness test of the tire.Taking the tire model as the object of water skiing simulation,the simulation analysis of unidirectional and bidirectional fluid-solid coupling algorithms is explored,and a comparative analysis of the dynamic hydraulic pressure of the tread by different coupling algorithms is made.The comparison of the obtained water skiing speed with the results of the DUNLAP water skiing empirical formula not only proves that the tire water skiing model is reasonable,but also that the two-way fluid-structure interaction algorithm is more accurate.In order to clarify the factors that hinder the drainage patency hidden in the vertical form tread groove,the analysis is carried out from the perspective of flow field characteristics.The pressure field of the main trench around the contact area and the contact plane was observed.With the help of Bernoulli's equation,the relationship between the flow velocity and the pressure field was obtained.Using water velocity vector decomposition and elaboration,the water flow direction in the trench and around the grounding area is displayed intuitively.Combined with Bernoulli's equation,the relevant mechanism of the reverse flow of water flow is reasonably and accurately revealed.Through the analysis method of the combination ofstreamline diagram and velocity vector diagram,the mechanism,hazards of the formation of water vortices at the drains of the horizontal trench and the reasons for the poor smoothness of the water flow at the intersection of the vertical and horizontal trenches were clarified.The static pressure characteristics,dynamic pressure characteristics and flow velocity characteristics of longitudinal sections at different axial positions were analyzed to obtain the change of water flow in the central longitudinal groove,the longitudinal groove at the shoulder and the free space near the sidewall.Finally,it is proposed to improve the water-skiing performance of tires by strengthening the patency of water flow in the receiving area and weakening the influence of water vortex.Considering the interference factors caused by the characteristics of the flow field of the tire in contact with the plane,and solving the obstacles to the drainage patency inside the groove as the guiding idea for the modification,the basic pattern of the V-shape is used instead of the horizontal pattern groove perpendicular to the vertical groove to maintain other structural parameters It is unchanged,and a static grounding characteristic test is designed to verify the reliability of the modified tire model.Water skiing simulation was set up again for the modified tire,and the speed of water skiing was increased by 6.1%.Finally,based on the distribution of the flow field characteristics of the modified tire,the specific reason for the improved water skiing performance of the tire was demonstrated,which proved that this modification has a significant effect on improving drainage patency.The method can effectively improve the anti-skid ability of the tire. |
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