基于模态法的高速列车车体关键位置应力谱及寿命评估研究

李传迎1,王秀刚1,吴兴文2,董晓华3,池茂儒3

振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 10-18.

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 10-18.
论文

基于模态法的高速列车车体关键位置应力谱及寿命评估研究

  • 李传迎1,王秀刚1,吴兴文2,董晓华3,池茂儒3
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Stress spectra and life estimation of key positions of high-speed train car body based on modal method

  • LI Chuanying1, WANG Xiugang1, WU Xingwen2, DONG Xiaohua3, CHI Maoru3
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文章历史 +

摘要

基于刚柔耦合理论,建立了考虑车体高频弹性振动的高速列车刚柔耦合动力学模型,利用模态应力恢复法对服役条件下车体关键位置动应力进行了求解。首先,通过扫频激励方法模拟了车辆典型服役模式,识别了典型服役工况下车体动态薄弱位置。其次,进一步研究了车体动态薄弱位置在不同轮轨匹配等效锥度下的特征应力谱。最后,基于京广线路条件仿真分析了不同轮轨匹配锥度状态下车体关键位置应力谱,并研究了不同应力谱编制方式对车体寿命评估的影响。结果表明:基于扫频激励方法的车体结构动态薄弱位置识别方法,可以有效识别车体结构动态薄弱位置;轮轨匹配等效锥度在镟修周期的动态演变会导致车辆稳定性下降,从而可以显著增大车体关键位置动应力幅值。因此,在车体结构关键位置寿命评估中,考虑轮轨关系动态演变对车辆关键部位应力谱的影响具有至关重要的意义。
关键词:高速列车高频刚柔耦合动力学模型;模态应力恢复;动态薄弱位置;特征应力谱;轮轨匹配等效锥度

Abstract

A rigid-flexible coupled high-speed train dynamic model considering the elastic deformation of car body was developed by using the modal synthesis method, and the modal stress recovery method was used to calculate the dynamic stress of car body. By using the proposed dynamic model, different frequency sweep excitations that reflect different operating modes of vehicle were primarily employed to identify the dynamic weak points of the car body, then the influences of the wheel/rail contact condition on the stress spectrum of weak points were investigated considering different wheel/rail equivalent conicities. Moreover, the stress spectrum of weak points for a typical high-speed railway line were obtained through simulation of the proposed dynamic model considering different wheel/rail contact conditions. In addition, different methods used to construct the stress spectrum for weak points were discussed so as to demonstrate the influences of wheel/rail contact condition on the fatigue life of car body. The results suggest that the frequency sweep method together with the modal stress recovery method can be used to identify the dynamic weak point in the car body under the service condition. The degradation process of wheel/rail contact during the reprofiling cycle can significantly deteriorate the operational stability of vehicle, thereby increase the stress amplitude of weak points. Therefore, it is desirable to consider the degradation process of wheel/rail contact in the estimation of fatigue lifetime of weak points in the car body.
Key words:High frequency rigid-flexible coupled dynamic model of high-speed train, Modal stress recovery method, Dynamic week position, Characteristic stress spectrum, Equivalent conicity of wheel/rail contact

关键词

高速列车高频刚柔耦合动力学模型 / 模态应力恢复 / 动态薄弱位置 / 特征应力谱 / 轮轨匹配等效锥度

引用本文

导出引用
李传迎1,王秀刚1,吴兴文2,董晓华3,池茂儒3. 基于模态法的高速列车车体关键位置应力谱及寿命评估研究[J]. 振动与冲击, 2022, 41(23): 10-18
LI Chuanying1, WANG Xiugang1, WU Xingwen2, DONG Xiaohua3, CHI Maoru3. Stress spectra and life estimation of key positions of high-speed train car body based on modal method[J]. Journal of Vibration and Shock, 2022, 41(23): 10-18

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