Railway Point System(RPS)is an important infrastructure in railway industry and its faults may have significant impacts on the safety and efficiency of train operations.For the fault diagnosis of RPS,most existing met...Railway Point System(RPS)is an important infrastructure in railway industry and its faults may have significant impacts on the safety and efficiency of train operations.For the fault diagnosis of RPS,most existing methods assume that sufficient samples of each failure mode are available,which may be unrealistic,especially for those modes of low occurrence frequency but with high risk.To address this issue,this work proposes a novel fault diagnosis method that only requires the power signals generated under normal RPS operations in the training stage.Specifically,the failure modes of RPS are distinguished through constructing a reasoning diagram,whose nodes are either binary logic problems or those that can be decomposed into the problems of the binary logic.Then,an unsupervised method for the signal segmentation and a fault detection method are combined to make decisions for each binary logic problem.Based on the results of decisions,the diagnostic rules are established to identify the failure modes.Finally,the data collected from multiple real-world RPSs are used for validation and the results demonstrate that the proposed method outperforms the benchmark in identifying the faults of RPSs.展开更多
综述了航空电子设备故障预测与健康管理(Prognostic and Health Management,PHM)技术的发展、应用价值与系统结构,探讨了航空电子设备故障检测、故障诊断和故障预测等关键技术的研究现状,分析了PHM关键技术在航空电子设备应用中面临的挑...综述了航空电子设备故障预测与健康管理(Prognostic and Health Management,PHM)技术的发展、应用价值与系统结构,探讨了航空电子设备故障检测、故障诊断和故障预测等关键技术的研究现状,分析了PHM关键技术在航空电子设备应用中面临的挑战,并对未来发展方向进行了展望。通过综合运用传感器技术、数据分析和人工智能等现代科技手段,PHM技术能够实现对航空电子设备健康状态的实时监控和预测,进行预防性维护,为提高航空装备安全和减少维护费用提供有力支持。展开更多
针对城市轨道交通列车无线调度通信系统维护工作量大、故障诊断困难、各制式检测系统不兼容等问题,设计了一种基于LTE-M(Long Term Evolution for Metro)和陆地集群无线电(TETRA,Terrestrial Trunked Radio)多制式融合的专用无线通信检...针对城市轨道交通列车无线调度通信系统维护工作量大、故障诊断困难、各制式检测系统不兼容等问题,设计了一种基于LTE-M(Long Term Evolution for Metro)和陆地集群无线电(TETRA,Terrestrial Trunked Radio)多制式融合的专用无线通信检测系统。文章阐述了该系统的构成和架构,以及列车无线调度通信系统的路测数据分析、历史数据回溯、故障诊断定位等功能。采用多线程处理等技术,实现了对TETRA与LTE-M多制式列车无线调度通信系统信号场强的自动采集。试验结果表明,该系统运行稳定,为城市轨道交通列车无线调度通信系统正常运营提供了更好保障。展开更多
基金supported by National Key R&D Program of China(2022YFB2602203)Talent Fund of Beijing Jiaotong University(2021RC274,I22L00131)National Natural Science Foundation of China(U1934219,52202392,52022010,U22A2046,52172322,62271486,62120106011,52172323)。
文摘Railway Point System(RPS)is an important infrastructure in railway industry and its faults may have significant impacts on the safety and efficiency of train operations.For the fault diagnosis of RPS,most existing methods assume that sufficient samples of each failure mode are available,which may be unrealistic,especially for those modes of low occurrence frequency but with high risk.To address this issue,this work proposes a novel fault diagnosis method that only requires the power signals generated under normal RPS operations in the training stage.Specifically,the failure modes of RPS are distinguished through constructing a reasoning diagram,whose nodes are either binary logic problems or those that can be decomposed into the problems of the binary logic.Then,an unsupervised method for the signal segmentation and a fault detection method are combined to make decisions for each binary logic problem.Based on the results of decisions,the diagnostic rules are established to identify the failure modes.Finally,the data collected from multiple real-world RPSs are used for validation and the results demonstrate that the proposed method outperforms the benchmark in identifying the faults of RPSs.
文摘综述了航空电子设备故障预测与健康管理(Prognostic and Health Management,PHM)技术的发展、应用价值与系统结构,探讨了航空电子设备故障检测、故障诊断和故障预测等关键技术的研究现状,分析了PHM关键技术在航空电子设备应用中面临的挑战,并对未来发展方向进行了展望。通过综合运用传感器技术、数据分析和人工智能等现代科技手段,PHM技术能够实现对航空电子设备健康状态的实时监控和预测,进行预防性维护,为提高航空装备安全和减少维护费用提供有力支持。
文摘针对城市轨道交通列车无线调度通信系统维护工作量大、故障诊断困难、各制式检测系统不兼容等问题,设计了一种基于LTE-M(Long Term Evolution for Metro)和陆地集群无线电(TETRA,Terrestrial Trunked Radio)多制式融合的专用无线通信检测系统。文章阐述了该系统的构成和架构,以及列车无线调度通信系统的路测数据分析、历史数据回溯、故障诊断定位等功能。采用多线程处理等技术,实现了对TETRA与LTE-M多制式列车无线调度通信系统信号场强的自动采集。试验结果表明,该系统运行稳定,为城市轨道交通列车无线调度通信系统正常运营提供了更好保障。
