基于简易轮胎试验模态测试的滚阻特性评价方法

通过对现阶段评价轮胎滚阻特性的总结及对轮胎滚阻产生机理的分析,提出了一种基于简易轮胎试验模态测试的滚阻特性评价方法,利用半功率带宽法对轮胎试验模态幅频特性进行计算,得到不同轮胎的阻尼比,以此评价其滚阻特性。试验结果表明,轮胎试验模态幅频特性的半功率带宽与其滚动阻力有密切关系,且呈正相关,其半功率带宽越大,一阶共振能量越分散,轮胎滚动阻力系数就越大。该结果进一步表明,不同轮胎的模态阻尼比与其滚动阻力系数之间具有很好的一致性,轮胎的阻尼比越大,其滚动阻力系数越大。本方法能够定性评价轮胎滚阻特性,从而提高轮胎滚动阻力测试效率,降低测试成本。

Evaluation of Rolling Resistance Characteristics Based on Simple Tire Experimental Modal Test

Tire rolling resistance has a great impact on the fuel economy of automobiles, accounting for about 20%~30% of the fuel consumption of automobiles. Evaluation of tire rolling resistance had become a difficult problem to solve for the industry. Aiming at the problem of tire rolling resistance testing at the present stage and the mechanism of tire rolling resistance caused by hysteresis effect, a tire rolling resistance evaluation method based on simple experimental modal was proposed. The rolling resistance characteristics of different tire modes were evaluated by calculating different tire modal damping characteristics by using half-power bandwidth method. The experimental results showed that the half-power bandwidth of the different tires amplitude frequency characteristics was closely related to their rolling resistance coefficient and kept positive correlation, the larger the half-power bandwidth of the tire mode amplitude frequency characteristic was, the more dispersed the energy of the first-order resonance energy was, and the larger the tire rolling resistance coefficient was. Furthermore, the experimental results showed that there was good consistency between the modal damping ratio of different tires and tires rolling resistance coefficient. The larger the tire damping ratio was, the larger the tire rolling resistance coefficient was. Therefore, it proved that the method can qualitatively evaluate the tire rolling resistance characteristics, which not only improved the efficiency of tire rolling resistance testing, but also reduced the cost of testing.