A longitudinal sliding test method to eliminate tire longitudinal force offset

Abstract

The invention discloses a longitudinal sliding test method for eliminating the longitudinal force deviation of a tire and belongs to the field of experimental research of dynamic characteristic tests of tires. According to the longitudinal sliding test method for eliminating the longitudinal force deviation of the tire, the slip rate in the test process is controlled through the effective rolling radius when the rolling resistance of the tire is zero, the relation curve of the longitudinal force of the longitudinal sliding characteristic of the tire and of the slip rate passes through the point (0, 0), when a tire empirical or semi-empirical longitudinal force model is built through test data without longitudinal force deviation, horizontal deviation and vertical deviation do not need to be considered in the model, model parameters are reduced so that tire modeling can be simplified, and meanwhile, analysis and research of the test data are facilitated.

Description

technical field [0001] The invention belongs to the field of tire dynamic characteristic test research, in particular to a longitudinal sliding test method for eliminating tire longitudinal force offset. Background technique [0002] As the only part that connects the car to the road, tires have an important impact on the operating stability and smoothness of the car. Establishing a simple and high-precision tire model is of great significance to the dynamics research of the whole vehicle. The tire models used for the dynamics research of the whole vehicle mainly include theoretical models, semi-empirical models and empirical models. The mainstream of the current application is the semi-empirical model. However, the data needed to establish the semi-empirical and empirical models of tires can only be obtained through tire tests. The carcass rubber of a rolling tire has a viscoelastic hysteresis phenomenon, and the ground normal reaction force at the front point in the compr...

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Problems solved by technology

[0003] Due to the existence of the rolling resistance moment of the test tire, the longitudinal force F of the tire longitudinal slip characteristic is x ——Slip rate S x The relationship curve does not reach the origin, such as figure 1 As shown, therefore, when using these test data to establish a tire model, the parameters of the model will be increased, and the form of the tire model will be more complicated. It is difficult to establish a simple and high-precision tire model, such as the well-known Magic Formula tire model in the field of international vehicle dynamics (referred to as MF model) in the longitudinal force calculation formula F x0 =D x sin[C x arctan{B x k x -E x (B x k x - arctan (B x k x ))}]+S Vx , where k x Combining arguments for longitudinal force: k x =k+S Hx , k is the longitudinal slip rate, S Hx is the horizontal offset of the curve: S Hx =(p Hx1 +p Hx2 df z )λ Hx , S Vx Offset in the vertical direction of the curve: S Vx =F z (p Vx1 +p Vx2 df z )λ Vx lambda μx ,p Hx1 ,p Hx2 ,p Vx1 ,p Vx2 is the parameter describing the longitudinal force deflection characteristics

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