This paper presents the basic structure and main technology parameters of bogie for rapid power concentrated EMU with small wheel, axle disc brake and motor elastic frame suspension, focus on the analysis of wheel-axle, drive and brake system, traction device, frame etc. The simulation results show that the bogie has excellent dynamic performance and the strength meets the requirements and achieves the goal of lightweight.

The torsional vibrations of traction drive shafting system of EMU is one of key factors on heavily influence the running smoothness,safety and reliability of high-speed train.The torsional vibrations of a typical traction drive shafting system of EMU are investigated.After a concise introduction,the traction drive shafting system is simplified and equivalent to a lumped-parameters model with five moment of inertias and four torsional stiffness coefficients.Then,considering the meshing relationship of driving and driven gears,an undamped free torsional vibration equation of this lumped model is established by using direct stiffness method.At last,the natural frequency and mode shapes of this shafting system are obtained with the help of MATLAB software.On the other hand,a MATLAB/Simulink simulation model is also constructed according to above lumped -parameters model equation.And subsequently,the acceleration and displacement Bode plots of shafting system are calculated from this simulation model,these amplitude-frequency results are very useful to verify the natural frequencies obtained directly from the lumped model equation.Results show that the established lumped mass model is available to simulate the torsional vibration characteristics of traction drive shafting system,and the torsional resonance and fatigue problems may mainly happen on the driving side of shafting system.The research works are very useful for the future study on the dynamic design and optimization of traction drive shafting system of EMU.

通过深圳1号线续建工程车辆 ATC 天线安装支架开裂故障入手，分析了开裂安装支架产生的原因，并根据新的设计输入，提出了新的安全、可靠、满足车辆实际运用要求的可行方案。

以HXD1型电力机车转向架为基础设计了HXD1F型电力机车转向架,这是我国首批自主研制的一种30吨轴重电力机车两轴转向架,对于提高我国铁路货运能力有标志性意义.文章介绍了这种货运转向架的技术参数和结构特点,简述了构架、车轮、车轴强度计算与动力学计算结论.