1/4车-路耦合动力学模型研究

将车辆简化为1/4车模型,路面结构视为地基梁或地基板,建立车-路耦合动力学模型;通过引入动态接触算法,采用直接积分法求解,比较了车-路耦合动力学模型与静力模型结果的差别;讨论了两种模型在车辆非悬挂系质点垂向加速度、车-路耦合作用力、路面板动弯沉、动应变、接缝嵌缝料剪切应变和接缝传荷效率等的异同.结果表明,两种模型的非悬挂质点垂向加速度、车-路耦合作用力、路面板动弯沉和接缝嵌缝料剪切应变等具有较好的一致性,在动应变及接缝传荷效率等方面有一定差异;地基板模型可很好地模拟移动车辆作用下混凝土路面结构的动态响应,而地基梁模型可高效地用于路面结构的接缝传荷、嵌缝料振动模拟.建立的模型可用于水泥混凝土路面动态响应分析和路面性能评价.

Study on One-quarter Vehicle-road Coupling Dynamics Models

The vehicle is simplified as a quartered model,and the pavement structure is regarded as a foundation beam or foundation plate.A vehicle-road coupling dynamics model is then established.With the dynamic contact algorithm and the direct integration method,the results obtained by coupling dynamics model and static model are compared.The discrepancies of vertical acceleration of non-suspension mass,vehicle-road interaction force,dynamic deflections and strains at specified points on pavements,shearing strain of joint sealant and joint load transfer efficiencies(LTE)(W),LTE(S) based on two models are discussed.The study shows that the results of the two models agree well,except the results of strains,LTE(W) and LTE(S) are of little bit difference;the vehicle-plate coupling dynamics model is suitable for simulating the dynamic responses of concrete pavements,whereas the vehicle-beam coupling dynamics model is effective to reflect the joint load transfer mechanism and joint sealant vibration.However,the models established hereof can be applied to the analysis of dynamic responses and evaluation of concrete pavements.