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采用有限单元法,将轨枕视为线性粘弹性连续支承梁单元,钢轨划分为线性粘弹性点支承梁单元,分别考虑每个单元的横向、纵向、竖向及扭转振动,建立铁路直线轨道结构空间振动模型。运用弹性系统总势能不变值原理,采用轨道不断“增加和缩减”技术,建立直线轨道结构空间振动时变质量、阻尼和刚度矩阵。以国产25Z型客车为例,计算200s时间段上车辆—轨道耦合振动动力响应,与实测结果比较吻合。
Using the finite element method, the sleeper is regarded as a linear viscoelastic continuous beam unit, and the rail is divided into linear viscoelastic point beam units. The horizontal, vertical, vertical and torsional vibration of each unit are considered respectively to establish the linear track structure space Vibration model. By using the principle of invariable value of total potential energy of elastic system, the time-varying mass, damping and stiffness matrix of space vibration of linear track structure are established by using the technique of continuous orbit “increase and decrease”. Taking the domestic 25Z passenger car as an example, the dynamic response of vehicle-track coupled vibration on 200s is calculated, which is in good agreement with the measured results.