Mechanism of track random irregularity affecting dynamic characteristics of rack vehicle
Mechanism of track random irregularity affecting dynamic characteristics of rack vehicle
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DOI：
10.1007/s11071-023-08258-4
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发表时间：
2023-01
影响因子：
5.6
通讯作者：
Zhaowei Chen;Shihui Li;Mi’ao Yuan;Lang Wang;Zhihui Chen;Jizhong Yang;Wu Yang
中科院分区：
文献类型：
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作者：
Zhaowei Chen;Shihui Li;Mi’ao Yuan;Lang Wang;Zhihui Chen;Jizhong Yang;Wu Yang
轨道的随机不平顺性不仅使齿条车辆运行的稳定性和平顺性恶化，而且增加了齿轮齿条系统的振动和冲击。为减少轨道随机不平顺性对轨道车辆动态特性的影响，基于轨道车辆-轨道（rack）耦合动力学模型（RVTM）研究了轨道不平顺性对轨道车辆的敏感性。首先，通过工程试验验证了RVTM的有效性和准确性。然后，根据轨迹不平顺的产生原理，分析了不平顺对齿轮齿条系统动态啮合行为的影响机理。结果表明，轨道的随机不均匀性对轨道车辆的振动有很大的影响。机架车辆的振动主要来自于轨道的随机不均匀性。不均匀激励对齿轮齿条系统的纵向和纵向振动影响较小，而对横向振动影响较大。齿轮齿条系统对不规则I（垂直不规则和横摇不规则）的响应较弱，而对不规则II（侧向不规则和规距不规则）的响应较强。因此，建议通过减少轨道不平顺度来提高齿轮齿条系统的稳定性，以保证齿条车辆的安全平稳运行。本文对RVTM进行了验证，可以有效地用于轨道车辆的动力学研究，优化轨道车辆的运行性能。研究轨道不平顺对轨道车辆的动力响应，为提高轨道车辆的稳定性提供了重要的理论依据，可为轨道铁路的设计与评价提供参考。
The track random irregularity not only worsens the running stability and smoothness of the rack vehicle, but increases the vibration and impact of the gear-rack system. To reduce the influence of track random irregularity on the dynamic characteristics of rack vehicle, the sensitivity of rack vehicle to track irregularity is studied based on the rack vehicle-track(rack)-coupled dynamic model (RVTM). Firstly, the effectiveness and accuracy of RVTM are verified through engineering tests. Then, according to the generation principle of track irregularity, the influence mechanism of irregularity on the dynamic meshing behavior of gear-rack system is analyzed. The results show that the track random irregularity has a great influence on the vibration of the rack vehicle. The vibration of the rack vehicle mainly comes from the track random irregularity. The vertical and longitudinal vibration of the gear-rack system is less affected by the irregularity excitation, while the lateral vibration is significantly affected. The gear-rack system is less sensitive to irregularity I (vertical irregularity and roll irregularity) and has a strong response to irregularity II (lateral irregularity and gauge irregularity). Therefore, it is suggested to improve the stability of the gear-rack system by reducing the track irregularity II to ensure the safe and smooth operation of the rack vehicle. RVTM is validated in this paper, which can be effectively used in the dynamics research of rack railway and optimizes the running performance of rack vehicle. The research on the dynamic response of the rack vehicle to the track irregularity provides an important theoretical basis for improving the stability of the rack vehicle and can provide a reference for the design and evaluation of the rack railway.