目前的飞行校验系统以GPS作为空间基准，这种定位方式在精度、性能、可靠性方面都存在着固有缺陷。本文介绍的同步定位．姿态．导航（SPAN，Synchronous Position，Attitude and Navigation）技术集合了两种不同但互补的技术：全球导航...目前的飞行校验系统以GPS作为空间基准，这种定位方式在精度、性能、可靠性方面都存在着固有缺陷。本文介绍的同步定位．姿态．导航（SPAN，Synchronous Position，Attitude and Navigation）技术集合了两种不同但互补的技术：全球导航卫星系统（GNSS，Global Navigation Satellite System）定位技术和喷性导航技术。通过二者的结合，SPAN技术可以达到取长补短的目的，组合后的导航系统无论在精度、性能、可靠性方面都优于单独的子系统。将这项技术应用于飞行校验系统，利用GNSS定位的绝对精度加上惯性测量单元（IMU）陀螺和加速计测量的稳定性，就可以在卫星信号丢失或者高动态应用环境下仍然提供持续、稳定、可靠的位置及姿态数据。展开更多
Considering the CRTS-II track slab,which is commonly used in the Chinese high-speed railway system,a vehicle-track-bridge dynamic analysis method is proposed in which the vehicle subsystem equations are established by...Considering the CRTS-II track slab,which is commonly used in the Chinese high-speed railway system,a vehicle-track-bridge dynamic analysis method is proposed in which the vehicle subsystem equations are established by the rigid body dynamics method,the track subsystem and the bridge subsystem equations are established by the FEM,the wheel-rail contact relation is defined by the corresponding assumption in vertical direction and the Kalker linear creep theory in lateral direction.The in-span spring element is derived to model the track-bridge interaction;the equal-band-width storage is adopted to fit the track structure with multilayer uniform section beam;and the dynamic equilibrium equations are solved by the inter-history iteration method.As a case study,the response of a CRH2 high-speed train transverses a simply-supported bridge with successive 31.5m double bound pre-stress beams is simulated.The result shows that using the vehicle-track-bridge interaction model instead of the vehicle-bridge interaction model helps predict the rotation angle at beam ends and choose an economic beam vertical stiffness.展开更多
基金supported by the National Basic Research Program of China("973"Project)(Grant No.2013CB036203)the National Natural Science Foundation of China(Grant No.U1134206)+1 种基金the 111 project(Grant No.B13002)the Doctoral Fund of Ministry of Education of China(Grant No.20130009110036)
文摘Considering the CRTS-II track slab,which is commonly used in the Chinese high-speed railway system,a vehicle-track-bridge dynamic analysis method is proposed in which the vehicle subsystem equations are established by the rigid body dynamics method,the track subsystem and the bridge subsystem equations are established by the FEM,the wheel-rail contact relation is defined by the corresponding assumption in vertical direction and the Kalker linear creep theory in lateral direction.The in-span spring element is derived to model the track-bridge interaction;the equal-band-width storage is adopted to fit the track structure with multilayer uniform section beam;and the dynamic equilibrium equations are solved by the inter-history iteration method.As a case study,the response of a CRH2 high-speed train transverses a simply-supported bridge with successive 31.5m double bound pre-stress beams is simulated.The result shows that using the vehicle-track-bridge interaction model instead of the vehicle-bridge interaction model helps predict the rotation angle at beam ends and choose an economic beam vertical stiffness.
