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为降低轮轨激励和气动载荷对250 km/h卧车动车组(Electric Multiple Unit,EMU)乘坐舒适性的影响,研发间壁T形单元和弹性组件,分析车体载荷工况,确定引起车体气动变形最大的载荷.利用三维仿真建模计算车体气动变形;以车体气动变形为边界条件,计算出车体与间壁T形单元固结时的节点反力;以节点反力为设计条件,运用仿真计算反向评价车体母材、间壁T形单元和弹性组件的受力是否均在许用应力范围内,并采用台架试验和实车试验,验证三者是否均满足设计要求.结果表明:在4 000 Pa外压和4 000 Pa内压载荷作用下,以及在极限载荷工况下,间壁T形单元强度和刚度均满足设计要求,并有较大安全裕量.两年多的运营实践证明该结构设计合理,满足运用要求.
In order to reduce the influence of wheel-rail excitation and aerodynamic load on ride comfort of 250 km / h Electric Multiple Unit (EMU), the T-shaped cell and elastic element were developed to analyze the load condition of the car body to determine the aerodynamic The deformation of the largest load. The use of three-dimensional simulation model to calculate the aerodynamic deformation of the body; aerodynamic deformation of the vehicle body as the boundary conditions to calculate the vehicle body and the T-shaped unit cell wall consolidation node reaction force; node reaction force as the design conditions, The simulation calculation is used to evaluate whether the stress of the car body base metal, the T-shaped cell and the elastic component of the car body are within the allowable stress range, and the bench test and the real car test are used to verify whether all the three meet the design requirements. It is shown that the strength and stiffness of the T-shaped T-shaped partition meet the design requirements under the external pressure of 4 000 Pa and the internal pressure of 4 000 Pa and under the ultimate load conditions, and have a large safety margin. Operation proved that the structure design is reasonable to meet the operational requirements.