为了推动智慧重载铁路建设,提升工务设备智能运维水平,采用大数据、BIM(Building Information Modeling)和GIS(Geography Information System)技术构建了工务设备全寿命周期管理系统,解决了数据孤岛等问题,实现了重载铁路工务设备数字...为了推动智慧重载铁路建设,提升工务设备智能运维水平,采用大数据、BIM(Building Information Modeling)和GIS(Geography Information System)技术构建了工务设备全寿命周期管理系统,解决了数据孤岛等问题,实现了重载铁路工务设备数字化、精细化管理。该管理系统将以设备为核心的各类数据予以统一存储、管理和共享,并通过制定工务设备及构件的统一分类编码规则,使得桥梁、隧道的BIM模型和线路单体构件矢量图以及检测数据、设计参数、病害信息等均可综合展示,为运维管理部门提供了高效便捷的数据服务。使用神经网络等技术对设备进行状态评估及变化趋势预测,为研究工务设备状态变化规律、制定养护维修决策提供了数据支持。展开更多
The prediction of the wheel wear is a fundamental problem in heavy haul railway. A numerical methodology is introduced to simulate the wheel wear evolution of heavy haul freight car. The methodology includes the spati...The prediction of the wheel wear is a fundamental problem in heavy haul railway. A numerical methodology is introduced to simulate the wheel wear evolution of heavy haul freight car. The methodology includes the spatial coupling dynamics of vehicle and track, the three-dimensional rolling contact analysis of wheel-rail, the Specht's material wear model, and the strategy for reproducing the actual operation conditions of railway. The freight vehicle is treated as a full 3D rigid multi-body model. Every component is built detailedly and various contact interactions between parts are accurately simulated, taking into account the real clearances. The wheel-rail rolling contact calculation is carried out based on Hertz's theory and Kalker's FASTSIM algorithm. The track model is built based on field measurements. The material loss due to wear is evaluated according to the Specht's model in which the wear coefficient varies with the wear intensity. In order to exactly reproduce the actual operating conditions of railway,dynamic simulations are performed separately for all possible track conditions and running velocities in each iterative step.Dimensionless weight coefficients are introduced that determine the ratios of different cases and are obtained through site survey. For the wheel profile updating, an adaptive step strategy based on the wear depth is introduced, which can effectively improve the reliability and stability of numerical calculation. At last, the wear evolution laws are studied by the numerical model for different wheels of heavy haul freight vehicle running in curves. The results show that the wear of the front wheelset is more serious than that of the rear wheelset for one bogie, and the difference is more obvious for the outer wheels. The wear of the outer wheels is severer than that of the inner wheels. The wear of outer wheels mainly distributes near the flange and the root; while the wear of inner wheels mainly distributes around the nominal rolling circle. For the outer wheel of front wheelset o展开更多
文摘为了推动智慧重载铁路建设,提升工务设备智能运维水平,采用大数据、BIM(Building Information Modeling)和GIS(Geography Information System)技术构建了工务设备全寿命周期管理系统,解决了数据孤岛等问题,实现了重载铁路工务设备数字化、精细化管理。该管理系统将以设备为核心的各类数据予以统一存储、管理和共享,并通过制定工务设备及构件的统一分类编码规则,使得桥梁、隧道的BIM模型和线路单体构件矢量图以及检测数据、设计参数、病害信息等均可综合展示,为运维管理部门提供了高效便捷的数据服务。使用神经网络等技术对设备进行状态评估及变化趋势预测,为研究工务设备状态变化规律、制定养护维修决策提供了数据支持。
基金Project(U1234211)supported of the National Natural Science Foundation of ChinaProject(20120009110020)supported by the Specialized Research Fund for Ph.D. Programs of Foundation of Ministry of Education of ChinaProject(SHGF-11-32)supported the Scientific and Technological Innovation Project of China Shenhua Energy Company Limited
文摘The prediction of the wheel wear is a fundamental problem in heavy haul railway. A numerical methodology is introduced to simulate the wheel wear evolution of heavy haul freight car. The methodology includes the spatial coupling dynamics of vehicle and track, the three-dimensional rolling contact analysis of wheel-rail, the Specht's material wear model, and the strategy for reproducing the actual operation conditions of railway. The freight vehicle is treated as a full 3D rigid multi-body model. Every component is built detailedly and various contact interactions between parts are accurately simulated, taking into account the real clearances. The wheel-rail rolling contact calculation is carried out based on Hertz's theory and Kalker's FASTSIM algorithm. The track model is built based on field measurements. The material loss due to wear is evaluated according to the Specht's model in which the wear coefficient varies with the wear intensity. In order to exactly reproduce the actual operating conditions of railway,dynamic simulations are performed separately for all possible track conditions and running velocities in each iterative step.Dimensionless weight coefficients are introduced that determine the ratios of different cases and are obtained through site survey. For the wheel profile updating, an adaptive step strategy based on the wear depth is introduced, which can effectively improve the reliability and stability of numerical calculation. At last, the wear evolution laws are studied by the numerical model for different wheels of heavy haul freight vehicle running in curves. The results show that the wear of the front wheelset is more serious than that of the rear wheelset for one bogie, and the difference is more obvious for the outer wheels. The wear of the outer wheels is severer than that of the inner wheels. The wear of outer wheels mainly distributes near the flange and the root; while the wear of inner wheels mainly distributes around the nominal rolling circle. For the outer wheel of front wheelset o
