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路堑过渡段对高速列车气动荷载的影响:基于IDDES方法
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作者 赵伦 邓锷 +3 位作者 杨伟超 倪一清 赵文 罗禄森 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第3期989-1002,共14页
当高速列车在横风条件下通过路堑过渡段时,列车的气动荷载将发生显著变化。本文基于改进的延迟分离涡湍流模型建立了列车-路基-风的三维空气动力学耦合模型,重点探讨了路堑深度对列车气动载荷变化和气动性能恶化的影响,揭示了相应的列... 当高速列车在横风条件下通过路堑过渡段时,列车的气动荷载将发生显著变化。本文基于改进的延迟分离涡湍流模型建立了列车-路基-风的三维空气动力学耦合模型,重点探讨了路堑深度对列车气动载荷变化和气动性能恶化的影响,揭示了相应的列车周围流场的演化机制。结果表明:当路堑深度为6 m时,头车所受的气动冲击能量最高。在列车完全驶入下一运行场景后,随着路堑深度的增大,来流对列车气动荷载的影响减弱,相应的波动幅度降低。头车气动载荷的突变幅值与风速近似满足线性正相关关系。 展开更多
关键词 高速列车 路堑过渡段 气动荷载 流场 横风
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Viscoelastic plastic continuous physical model of a magnetorheological damper applied in the high speed train 被引量:1
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作者 LI ZhongJi ni yi-qing +1 位作者 DAI HuanYun YE ShuQin 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第10期2433-2446,共14页
In the preliminary design stage of high-speed train smart suspension,a simple,yet accurate magnetorheological(MR)damper model whose parameters have clear physical meaning is needed.Based on the working mechanism analy... In the preliminary design stage of high-speed train smart suspension,a simple,yet accurate magnetorheological(MR)damper model whose parameters have clear physical meaning is needed.Based on the working mechanism analysis and the dynamic behavior study of the MR damper,a new consecutive viscoelastic plastics(VEP)model is proposed.A methodology to find the parameters of the proposed model directly has been proposed.The comparison with experimental results indicates that the proposed model could adequately characterize the intrinsic nonlinear behavior of the MR damper,including the hysteretic behavior,roll-off phenomenon,and the variation of the hysteresis width in terms of the frequency and magnitude of excitation.The results of experimental testing prove that the accuracy of the proposed model is higher than that of the phenomenological model while only containing four undetermined parameters with clear physical meaning.Moreover,based on the proposed VEP model,a nonlinear stiffness VEP(nkVEP)model is developed with higher precision in the hysteretic region.The nkVEP model,which can reproduce the behavior of the damper with fluctuating input current,is developed.The proposed model could predict accurately the response of the MR damper in a wide range of frequency and displacement. 展开更多
关键词 magnetorheological (MR) damper physical model viscoelastic plastics (VEP) model nonlinear stiffness VEP (nkVEP)model parameters identification
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