Heavy-duty tire modeling method based on analysis of tire sidewall rigidity

Abstract

The invention discloses a heavy-duty tire modeling method based on analysis of tire sidewall stiffness. The method comprises the following steps: S1, constructing an analysis stiffness tire sidewall model according to a flexible tire body beam model; s2, establishing a sidewall large-deformation nonlinear analytical stiffness solving model according to the sidewall analytical stiffness model. According to the method, the bending dynamic characteristics of a flexible carcass beam of a heavy-duty tire and the rigidity characteristics of a sidewall curved beam with a large flatness ratio are researched from the aspects of theory and experiment, and a one-dimensional flexible carcass beam bending vibration equation considering inflation pre-tightening axial force is established; the method considers the inflation pre-tightening chord rigidity and the structural rigidity of the sidewall, proposes an analytical rigidity modeling method of the sidewall curved beam with the large flatness ratio; the change of nonlinear analytical rigidity caused by the change of the sidewall structure in the large deformation process of the sidewall curved beam with the large flatness ratio is derived, anda theoretical basis is provided for parameter design and material selection of a heavy-duty tire.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to a heavy-duty tire modeling method based on analyzing the sidewall stiffness. Background technique [0002] As the only element in contact with the ground during the driving of special vehicles, tires not only transmit most of the force to the vehicle, but also alleviate the impact and vibration caused by unevenness of the road surface. Therefore, the performance indicators of the vehicle, such as power and ride comfort , braking and handling stability, etc. are closely related to the mechanical characteristics of the tire. Carrying out vehicle dynamics simulation analysis is also inseparable from an accurate tire dynamics model; Under the action of bearing capacity, deformation occurs, and at the same time, under the excitation of road unevenness, the carcass is transmitted to the rim through the sidewall and the cavity. Therefore, the structural flexible vibration of...

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Problems solved by technology

[0003] Among the existing tire models, the simplified tire model mainly uses the curve fitting method to characterize the force and moment characteristics of the tire, and the calculation efficiency is high. However, because the flexible deformation of the carcass and sidewall is ignored, this type of model can only satisfy the vehicle Low-frequency stability performance simulation accuracy requirements, large errors in mid- and high-frequency comfort performance, durability and NVH (noise, vibration and vibration harshness) simulation; with the development of numerical calculation methods, the finite element method is introduced into tires In the modeling of high-frequency dynamic characteristics, in order to accurately characterize and describe the tire characteristics, the finite element tire model needs to use a large number of elements to accurately describe the geometric and material characteristics of the tire, which greatly increases the complexity of numerical calculations and cannot meet the requirements of the whole model. Vehicle dynamics requires high-efficiency calculations; the tire structure model adopts a dynamic modeling method, which can achieve high simulation accuracy with a small amount of calculation, and has been valued by scholars at home and abroad. It has been better applied in the study of the vibration characteristics of ordinary tires, and the flexible carcass tire model based on constant stiffness or linear variable stiffness elastic foundation is mostly used;

[0004] The average axle load of special heavy-duty vehicles is 10-13t, and heavy-duty tires must be selected. In order to ensure that the vehicle has a certain off-road capability, the flat ratio κ (ratio of the radial length of the sidewall to the width of the carcass) of the heavy-duty tire is relatively large. is 0.98, while the flat ratios of car tires and passenger car tires are 0.3 and 0.5 respectively; due to the structural characteristics of the large flat ratio of heavy-duty tires, large deformation occurs in the sidewall during the heavy load process. The flexible carcass tire model based on constant stiffness or linear variable stiffness elastic basis cannot effectively characterize the mechanical properties of heavy-duty tires under large deformation

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