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When a train runs at high speeds, the external exciting frequencies approach the natural frequencies of bogie critical components, thereby inducing strong elastic vibrations. The present international reliability test evaluation standard and design criteria of bogie frames are all based on the quasi-static deformation hypothesis. Structural fatigue damage generated by structural elastic vibrations has not yet been included. In this paper, theoretical research and experimental validation are done on elastic dynamic load spectra on bogie frame of high-speed train. The construction of the load series that correspond to elastic dynamic deformation modes is studied. The simplified form of the load series is obtained. A theory of simplified dynamic load–time histories is then deduced. Measured data from the Beijing–Shanghai Dedicated Passenger Line are introduced to derive the simplified dynamic load–time histories. The simplified dynamic discrete load spectra of bogie frame are established. Based on the damage consistency criterion and a genetic algorithm, damage consistency calibration of the simplified dynamic load spectra is finally performed. The computed result proves that the simplified load series is reasonable. The calibrated damage that corresponds to the elastic dynamic discrete load spectra can cover the actual damage at the operating conditions. The calibrated damage satisfies the safety requirement of damage consistency criterion for bogie frame. This research is helpful for investigating the standardized load spectra of bogie frame of high-speed train. 相似文献
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将数控机床整机的动态性能分析与可视化设计方法相结合,以沈阳机床集团的某数控加工中心为例,提出了整机动力学可视化设计流程,包括设计目标、设计内容以及设计方法;最后对该加工中心进行整机动态性能可视化仿真,得出强度、固有特性以及谐响应情况,为该机床结构性能的优化提供依据. 相似文献
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新型独立转向架的研制及其在改善轮轨关系方面的应用 总被引:1,自引:0,他引:1
从轮轨接触的形式、轮轨磨损成因及降低轮轨磨耗的对策分析出发,通过对独立旋转车轮工矿车辆转向架的研制和运行验证后,对该转向架的优点做了总结,结果表明该转向架在降低轮轨磨耗、提高曲线通过能力、提高适应线路扭曲的能力、改善车辆运行品质等方面均有明显效果,这对铁路干线车辆转向架具有借鉴意义。 相似文献
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