Rayleigh wave dispersion signals are significant to underground investigation.Tradition-ally,uniformed trace spacing is employed in surface wave surveys.In some cases,however,uneven trace spacing is often encountered ...Rayleigh wave dispersion signals are significant to underground investigation.Tradition-ally,uniformed trace spacing is employed in surface wave surveys.In some cases,however,uneven trace spacing is often encountered because of the limitations of the site condition.In order to study the influence of uneven trace spacing on the dispersion data construction of Rayleigh waves,data acquisi-tion is performed based on a 2.5D field layout with a linear array of geophones fixed and a mobile source.The observation direction controls the trace spacing of the measurement.The final results demonstrate that the trace nonuniformity has significant influence on the Rayleigh wave dispersion feature constructed.When the observation angle is over 45o,the dispersion image will be too distorted to extract dispersion data correctly.展开更多
Real vehicle tracking data play an important role in the research of routing in vehicle sensor networks. Most of the vehicle tracking data, however, were collected periodically and could not meet the requirements of r...Real vehicle tracking data play an important role in the research of routing in vehicle sensor networks. Most of the vehicle tracking data, however, were collected periodically and could not meet the requirements of real-time by many applications. Most of the existing trace interpolation algorithms use uniform interpolation methods and have low accuracy problem. From our observation, intersection vehicle status is critical to the vehicle movement. In this paper, we proposed a novel trace interpolation algorithm. Our algorithm used intersection vehicle movement modeling (IVMM) and velocity data mining (VDM) to assist the interpolation process. The algorithm is evaluated with real vehicle GPS data. Results show that our algorithm has much higher accuracy than traditional trace interpolation algorithms.展开更多
高速铁路信号联锁系统调试试验是保障竣工验收的关键环节。针对高速铁路信号联锁系统高度集成、复杂耦合的特点,开展调试试验研究,构建包括调试前准备、单体调试、室内外综合试验及系统联调联试四个阶段的标准化调试流程体系。针对调试...高速铁路信号联锁系统调试试验是保障竣工验收的关键环节。针对高速铁路信号联锁系统高度集成、复杂耦合的特点,开展调试试验研究,构建包括调试前准备、单体调试、室内外综合试验及系统联调联试四个阶段的标准化调试流程体系。针对调试过程中复杂故障诊断的难题,提出一种结合故障树分析(fault tree analysis,FTA)与数据流追踪的系统化故障诊断与处理方法。依托渝昆高铁工程实践验证,采用FTA方法后,各类故障处理时间缩短13.3%以上;数据流追踪方法使接口故障精确定位时间缩短14.3%。该研究成果可为高速铁路信号系统的安全高效调试提供理论依据与实践指导。展开更多
基金supported by the "973-Project" (No. 2007CB714405)LIESMARS Special Research Funding,LOGEG Research Founding (No. 2008-02-08)the Key Laboratory of Precision Engineering & Industry Surveying,State Bureau of Surveying and Mapping
文摘Rayleigh wave dispersion signals are significant to underground investigation.Tradition-ally,uniformed trace spacing is employed in surface wave surveys.In some cases,however,uneven trace spacing is often encountered because of the limitations of the site condition.In order to study the influence of uneven trace spacing on the dispersion data construction of Rayleigh waves,data acquisi-tion is performed based on a 2.5D field layout with a linear array of geophones fixed and a mobile source.The observation direction controls the trace spacing of the measurement.The final results demonstrate that the trace nonuniformity has significant influence on the Rayleigh wave dispersion feature constructed.When the observation angle is over 45o,the dispersion image will be too distorted to extract dispersion data correctly.
文摘Real vehicle tracking data play an important role in the research of routing in vehicle sensor networks. Most of the vehicle tracking data, however, were collected periodically and could not meet the requirements of real-time by many applications. Most of the existing trace interpolation algorithms use uniform interpolation methods and have low accuracy problem. From our observation, intersection vehicle status is critical to the vehicle movement. In this paper, we proposed a novel trace interpolation algorithm. Our algorithm used intersection vehicle movement modeling (IVMM) and velocity data mining (VDM) to assist the interpolation process. The algorithm is evaluated with real vehicle GPS data. Results show that our algorithm has much higher accuracy than traditional trace interpolation algorithms.
文摘高速铁路信号联锁系统调试试验是保障竣工验收的关键环节。针对高速铁路信号联锁系统高度集成、复杂耦合的特点,开展调试试验研究,构建包括调试前准备、单体调试、室内外综合试验及系统联调联试四个阶段的标准化调试流程体系。针对调试过程中复杂故障诊断的难题,提出一种结合故障树分析(fault tree analysis,FTA)与数据流追踪的系统化故障诊断与处理方法。依托渝昆高铁工程实践验证,采用FTA方法后,各类故障处理时间缩短13.3%以上;数据流追踪方法使接口故障精确定位时间缩短14.3%。该研究成果可为高速铁路信号系统的安全高效调试提供理论依据与实践指导。
