英语翻译2.Vehicle bridge interaction models2.1.VehicleIn this wo

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英语翻译
2.Vehicle bridge interaction models
2.1.Vehicle
In this work a two-axle truck is employed; the model consists of three rigid bodies that represent the box and both axles.Each axle is connected with the box by springs and dashpots with the mechanical characteristics of the suspensions and is joined to the ground by the same kind of elements which represent the dynamic behaviour of the tyres.X,Y and Z axis are set longitudinal,upwards vertical and lateral respectively (Fig.1).Vehicle body is assigned three degrees of freedom:vertical displacement [yb],roll [ab] and pitch [bb].Each axle is provided with two degrees of freedom:vertical displacement [yfa for the front axle and yra for the rear axle] and roll [afa and ara].Given that,the model has a total of seven
DOF.

2. 车辆－桥梁相互作用模型
2.1. 本研究中的车辆采用两轴卡车; 该车型由三个刚体组成,他们代表车箱和两个车轴.每个车轴通过弹簧和减振器相连,具有悬架的机械特性,并由代表轮胎动态行为的同类元素连接到地面. X,Y和Z轴分别设定为纵向,向上垂直方向和横向（图1）.车体被分配三个自由度：垂直位移[YB],滚转[AB]和节距[BB].每一轴具有两个自由度：垂直位移[YFA为前轴和YRA为后轴]和滚转[AFA和ARA].鉴于此,该模型共有七个自由度.

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