It is of significance to establish the time domain model of road roughness for the theoretical research on modern vehicle. Harmony superposition method was applied to establish the road roughness model with a single wheel vehicle. Two kinds of methods were proposed to calculate the coherence of bilateral track excitation, and combining with the correlation of front and rear wheel, road roughness model with 4-wheel vehicle was built. Simulation results show that the two modeling methods are correct in theory of coherence and can be applied to simulate stochastic road roughness with a specific spectrum. Compared with other methods, proposed methods improve the efficiency of modeling.%路面不平度时域模型对现代汽车理论研究意义重要.应用谐波叠加法建立单轮路面不平度输入模型,提出两种不同轮辙路面空间相关模型,并结合同轮辙路面不平度输入时间延迟关系,将单轮模型拓展为四轮路面不平度时域模型.仿真分析显示,该两种方法建立的路面不平度模型,其功率谱与理论功率谱基本吻合,异轮辙输入相干函数符合理论规律.与其它方法相比,该模型建模效率高.
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