随机风载下高速列车动力学安全特性

为了研究随机风载下高速列车的动力学特性，提出一种随机风环境下高速列车安全平稳性评估方法。基于Kármán理论和Davenport相干函数通过谐波合成法建立随机风数值模拟模型，并推导随机风作用下的高速列车非定常气动载荷的计算公式。通过SIMPACK建立车辆系统动力学模型，计算不同随机风载作用下的高速列车以不同车速运行过程中的安全性指标及平稳性指标。最后，本文选择了包括脱轨系数、轮重减载率、轮轴横向力、Sperling平稳性指标在内的多性能指标作为目标来支持决策。通过仿真对多性能指标进行评价，验证了该模型在强风下高速列车运行动力学特性研究中的适用性。

Research on the Safety Characteristics of High-speed Train Dynamics Under Random Wind Load

In order to study the dynamics of high-speed trains under random wind loads, a method is proposed to evaluate the safety and smoothness of high-speed trains under random wind environment. Based on the Kármán theory and Davenport coherence function, a numerical simulation model of random wind is established by the harmonic synthesis method, and the formulae for calculating the non-constant aerodynamic loads of high-speed trains under the action of random wind are derived. The vehicle system dynamics model is established by SIMPACK to calculate the safety indexes and smoothness indexes during the operation of high-speed trains with different speeds under the action of different random wind loads. Finally, the multi-performance indexes including derailment coefficient, wheel weight reduction rate, axle transverse force, and Sperling smoothness index are selected as targets to support the decision in this paper. The applicability of the model in the study of high-speed train operation dynamics characteristics under strong wind is verified by evaluating the multi-performance indexes through simulation.