车辆—路面空间耦合振动模型及其动力响应分析

为准确模拟行驶车辆作用下刚性路面的动力响应,建立车辆—路面空间耦合振动精细化分析模型。车辆采用质点—弹簧—阻尼器空间整车模型,混凝土刚性路面采用弹性地基板有限元模型,采用改进的谐波叠加法考虑路面平整度的三维空间分布,利用车轮和路面的位移协调方程将车辆振动和路面振动联立求解。实例分析表明,所建立的车—路耦合振动模型能够真实地反映车辆和路面间的空间几何耦合关系和力学耦合关系;在三维路面不平度的激励下,车辆和路面的动态响应均表现出明显的空间分布特性;与瞬态动力分析方法相比,利用考虑路面不平度空间分布的车—路耦合振动模型对混凝土路面进行车辆动力响应分析时,路面弯沉和板底应力有明显增大。

The spatial model of vehicle-pavement coupling vibration and its dynamic responses analysis

A fine spatial vehicle-pavement coupling vibration model was established to simulate the dynamic responses of rigid pavement under moving vehicle, in which the mass-spring-damper model was adopted for the vehicle and the finite element model based on the Winkler foundation was adopted for the concrete pavement. The improved harmonic superposition method was used to consider the 3-D distribution of road surface roughness, and the displacement coordination equation was used for the simultaneous solution of the vehicle and pavement vibration. Example analysis showed that the established vehicle pavement coupling vibration model could truly reflect the space geometric and mechanical coupling relationship between vehicle and pavement. With the stimulus of three dimensional road roughness, the dynamic response of the vehicle and pavement showed significant spatial distribution characteristics. Comparing with the results of the transient dynamic analysis method, the deflection and stress of the pavement significantly increased.