Abstract: The vehicle swing affects traffic safety and riding comfort,while the acceleration noise is exactly a description of vehicle swing.Thus,acceleration noise could be a quantitative evaluation indicator of driving safety and comfort.Combining with acceleration noise theory,two new acceleration noise models are established by dividing vehicle acceleration into horizontal component and vertical component.Different proportion is given because human body is not the same in sensibility to different vibration directions.Then,the synthetic acceleration noise model is established.Finally,simulations are performed by choosing appropriate road.The simulation results show that curvature radius and driving speed have great large influence on riding comfort.The new model can provide not only mathematical model to evaluate riding comfort completely,but also certain parameters for reference in new highway design.

Key words: circular curve, curve radius, acceleration noise, driving comfort, evaluation indicator