轮对动不平衡对构架扭转变形的贡献评估

Contribution Assessmentof Bogie's Torsion Deformation By Wheelset Dynamical Unbalance

使用Simpack建立了某高速动车组车辆整车的动力学模型,用Hyperworks创建了带附加装置和不带附加装置的构架有限元模型.通过Nastran的有限元处理,实现了该有限元模型与多刚体车辆动力学模型的耦合仿真.研究了在动不平衡激励与构架一阶扭转频率接近时,对构架扭转变形的影响.结果表明:前后轮对动不平衡的相位对构架扭转变形影响较大,且当动不平衡与一阶扭转频率接近时,受一系垂向减振器的衰减,变形减小约一半以上,最大扭转变形为0.29 mm.

The vehicle dynamics model is established by Simpack,and the finite element bogie is modeled by the Hyperworks.The coupling simulation of the finite element model and multi-rigid-body vehicle dynamic model is realized by Nastran′s finite dealing.The influence of dynamical unbalance excitationon bogie torsion deformationis studied,especially when the excitation frequency is close to the bogie first order nature frequency.The result shows that the deformationin the extreme condition caused by unbalance excitation is about 0.29 mm,about 30%of deformation by the track excitation.The vertical damper of first suspension reduces the torsion deformation efficiently.Maximum value is 0.29 mm,more than 50%of the whole torsion deformation by the track excitation and unbalance excitation.In addition,the phase of the unbalance excitation between the front wheel-set and the rare wheel-set is important to the torsion deformation of the bogie.