1/4车-路耦合动力学模型研究

Study on One-quarter Vehicle-road Coupling Dynamics Models

摘要:

将车辆简化为1/4车模型，路面结构视为地基梁或地基板，建立了车-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存在一定差异； 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。

Abstract:

The vehicle is simplified as a one-quarter model, and the pavement structure is regarded as a foundation beam or foundation plate, by combining the two parts a vehicle-road coupling dynamics model is then established, through introducing a dynamic contact algorithm and employing the direct integration method, the differences of results obtained with coupling dynamics model and based upon static model are compared, the discrepancies of vertical acceleration of non-suspension mass at, vehicle-road interaction force P, dynamic deflections W and strains εx at specified points on pavements, shearing strain of joint sealant γ and joint load transfer efficiencies LTE(W), LTE(S) based on two models are discussed. The study showed that the results of at, P, We1 as well as γ upon two models are well agreement with each other, while the results of εx, LTE(W) and LTE(S) based on two models 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 might be used to analysis of dynamic responses and evaluation of concrete pavements.