铁道科学与工程学报2024，Vol.21Issue(6)：2142-2150,9.DOI:10.19713/j.cnki.43-1423/u.T20231395
车辆-轨道系统动力极值预测及可靠度计算
Dynamic extrema prediction and reliability assessment of vehicle-track coupled system
摘要
Abstract
To analyze vehicle running safety and quantify system reliability from the viewpoint of the dynamic extreme prediction and reliability calculations for vehicle-track systems,based on vehicle-track coupled dynamics and probability theory,a method for predicting dynamic extreme responses and evaluating system reliability was proposed.First,a track irregularity probabilistic model was introduced to determine the random sequences of irregular samples with different excitation energies,in which the cumulative probability spectrum was treated as an indicator.Based on the discrete Parseval theorem,the relationship between time-domain track irregularities and their power spectral densities(PSDs)was established.By combining the track irregularity probabilistic model and vehicle-track coupled dynamics model,the dynamic extremes and reliability information of the vehicle-track system were extracted from the stochastic analysis.Subsequently,by using vehicle-track coupled dynamics analysis and a two-dimensional interpolation operator,the dynamic response extremum was predicted based on the energy relationship of the PSD curves.Additionally,based on the probabilistic equivalence between the excitation input and response output,the reliability formula of dynamic extreme responses was derived.The numerical results of lateral wheel-rail forces and vertical rail displacements obtained from the measured track irregularities and vehicle acceleration,subjected to the combination of four types of irregularities at different cumulative probabilities,were used as samples and compared to the predictions.The distribution of the predicted values is consistent with that of the measured values at high accuracy.Due to the randomness of track irregularities,the dynamic responses of the vehicle-track system exhibit discrete and variance characteristics,but the method of extremum prediction through the amplitude-frequency and energy characteristics of track irregularities is proven to be feasible.关键词
车辆-轨道耦合动力学/随机不平顺/动力极值/可靠度评估/概率模型Key words
vehicle-track coupled dynamics/track random irregularities/dynamic extrema/reliability assessment/probabilistic model分类
交通工程引用本文复制引用
徐磊,朱雪燕,金浩然,刘鹏飞,闫斌,余志武..车辆-轨道系统动力极值预测及可靠度计算[J].铁道科学与工程学报,2024,21(6):2142-2150,9.基金项目
省部共建交通工程结构力学行为与系统安全国家重点实验室开放课题(KF2022-09) （KF2022-09）
河北省省级科技计划资助(215676145H) （215676145H）
国家自然科学基金资助项目(52378468,52008404,U1934217) （52378468,52008404,U1934217）
中国中铁重大专项(2020-Special-02,2021-Major-02,2021-Special-08) （2020-Special-02,2021-Major-02,2021-Special-08）
中南大学创新驱动计划项目(2023CXQD072) （2023CXQD072）
中国科学青年人才托举工程项目(2020-2022QNRC002) （2020-2022QNRC002）
湖南省自然科学基金资助项目(2021JJ30850,2022JJ20070) （2021JJ30850,2022JJ20070）
