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通过简化圣维南模型计算路面水膜厚度,并根据水力学理论,简化轮胎动水压力,得出潮湿状态下路面附着系数计算公式。应用有限元方法,分析轮胎在车辆荷载作用下下沉量,将其与经验公式对比,验证模型可行性。最后,建立有限元模型模拟轮胎与路面接触,分析在不完全滑水状态下轮胎荷载、行车速度、轮胎气压、水膜厚度对轮胎-路面接触面积及附着系数的影响,分析结果表明,随轮胎荷载增大,轮胎-路面接触面积变大,附着系数增大;随行车速度增大,附着系数在速度40～80km/h区间内下降较为平缓,在速度80km/h后,下降趋势较为急剧;随胎压增大,附着系数在胎压220～260kPa区间内下降较为剧烈,在胎压260kPa以后则变化较小;水膜厚度低时,附着系数随行车速度变化剧烈,而水膜厚度大时,则趋于平缓。
By simplifying the Saint-Venant model to calculate the pavement water film thickness and simplifying the hydrodynamic pressure of the tire according to the theory of hydraulics, the formulas for calculating the pavement adhesion coefficient under wet conditions are obtained. Finite element method was used to analyze the tire subsidence under vehicle load, and compared with the empirical formula to verify the feasibility of the model. Finally, the finite element model was established to simulate the contact between the tire and the pavement, and the influence of tire load, driving speed, tire pressure and water film thickness on tire-pavement contact area and adhesion coefficient under incomplete water-skiing condition was analyzed. When the load increases, the tire-road contact area becomes larger and the adhesion coefficient increases. With the increase of the traveling speed, the adhesion coefficient decreases slowly at the speed of 40-80km / h. After the speed of 80km / h, the downward trend is more rapid. With the increase of tire pressure, the adhesion coefficient decreases sharply in the tire pressure range of 220 ~ 260kPa, and changes little after the tire pressure of 260kPa. When the thickness of water film is low, the adhesion coefficient changes drastically with the traveling speed, , Then tends to be flat.