The objective of this study is to improve the methods of determining unimpeded（nominal） taxiing time,which is the reference time used for estimating taxiing delay,a widely accepted performance indicator of airport s...The objective of this study is to improve the methods of determining unimpeded（nominal） taxiing time,which is the reference time used for estimating taxiing delay,a widely accepted performance indicator of airport surface movement.After reviewing existing methods used widely by different air navigation service providers（ANSP）,new methods relying on computer software and statistical tools,and econometrics regression models are proposed.Regression models are highly recommended because they require less detailed data and can serve the needs of general performance analysis of airport surface operations.The proposed econometrics model outperforms existing ones by introducing more explanatory variables,especially taking aircraft passing and over-passing into the considering of queue length calculation and including runway configuration,ground delay program,and weather factors.The length of the aircraft queue in the taxiway system and the interaction between queues are major contributors to long taxi-out times.The proposed method provides a consistent and more accurate method of calculating taxiing delay and it can be used for ATM-related performance analysis and international comparison.展开更多
通过分析性能与可靠性一体化设计国内外相关研究工作的研究成果与不足,提出了性能与可靠性一体化设计(IDPaR,Integrating Design for Performance and Reliability)的研究思路.从产品发生故障的内、外因角度建立了性能与可靠性一体化设...通过分析性能与可靠性一体化设计国内外相关研究工作的研究成果与不足,提出了性能与可靠性一体化设计(IDPaR,Integrating Design for Performance and Reliability)的研究思路.从产品发生故障的内、外因角度建立了性能与可靠性一体化设计综合模型,提出了性能可靠度的定义和计算方法.并针对典型飞控系统,给出了各类内外影响因素的具体建模方法,总结提出了性能与可靠性一体化设计算法流程和分析方法.最后以某型导弹为案例,进行性能与可靠性一体化设计技术的应用验证.展开更多
The elements of network profile are proposed.Based on the network traffic distribution model,the network profile includes the application request rate,the branch transfer probability,the ratio of application requests,...The elements of network profile are proposed.Based on the network traffic distribution model,the network profile includes the application request rate,the branch transfer probability,the ratio of application requests,and the probability distribution of the requested objects.Based on the evaluation method of network performance reliability,four simulation cases are constructed in OPNET software,and the results show the four elements of profile have impacts on the network reliability.展开更多
导航系统性能仿真面临多领域模型集成和分析的困难。研究了仿真模型可移植性(simulation model portability,SMP2.0)规范,分析了卫星导航系统仿真的基本特点和需求,提出了卫星导航性能仿真的可移植性框架,建立了基于SMP2.0的导航仿真应...导航系统性能仿真面临多领域模型集成和分析的困难。研究了仿真模型可移植性(simulation model portability,SMP2.0)规范,分析了卫星导航系统仿真的基本特点和需求,提出了卫星导航性能仿真的可移植性框架,建立了基于SMP2.0的导航仿真应用架构。该架构包含导航系统模型设计、开发、集成、运行和试验分析,涵盖了所有导航系统大系统性能指标的仿真分析。最后,基于此方法采用GALILEO系统相关想定数据对其导航性能指标进行了仿真和试验分析。结果表明,本文所提方法和技术框架能够很好地满足卫星导航系统仿真的特殊需求。展开更多
基金supported by FAA ATO-G under contract DTFAWA-09-P-00245
文摘The objective of this study is to improve the methods of determining unimpeded（nominal） taxiing time,which is the reference time used for estimating taxiing delay,a widely accepted performance indicator of airport surface movement.After reviewing existing methods used widely by different air navigation service providers（ANSP）,new methods relying on computer software and statistical tools,and econometrics regression models are proposed.Regression models are highly recommended because they require less detailed data and can serve the needs of general performance analysis of airport surface operations.The proposed econometrics model outperforms existing ones by introducing more explanatory variables,especially taking aircraft passing and over-passing into the considering of queue length calculation and including runway configuration,ground delay program,and weather factors.The length of the aircraft queue in the taxiway system and the interaction between queues are major contributors to long taxi-out times.The proposed method provides a consistent and more accurate method of calculating taxiing delay and it can be used for ATM-related performance analysis and international comparison.
文摘通过分析性能与可靠性一体化设计国内外相关研究工作的研究成果与不足,提出了性能与可靠性一体化设计(IDPaR,Integrating Design for Performance and Reliability)的研究思路.从产品发生故障的内、外因角度建立了性能与可靠性一体化设计综合模型,提出了性能可靠度的定义和计算方法.并针对典型飞控系统,给出了各类内外影响因素的具体建模方法,总结提出了性能与可靠性一体化设计算法流程和分析方法.最后以某型导弹为案例,进行性能与可靠性一体化设计技术的应用验证.
文摘The elements of network profile are proposed.Based on the network traffic distribution model,the network profile includes the application request rate,the branch transfer probability,the ratio of application requests,and the probability distribution of the requested objects.Based on the evaluation method of network performance reliability,four simulation cases are constructed in OPNET software,and the results show the four elements of profile have impacts on the network reliability.
文摘导航系统性能仿真面临多领域模型集成和分析的困难。研究了仿真模型可移植性(simulation model portability,SMP2.0)规范,分析了卫星导航系统仿真的基本特点和需求,提出了卫星导航性能仿真的可移植性框架,建立了基于SMP2.0的导航仿真应用架构。该架构包含导航系统模型设计、开发、集成、运行和试验分析,涵盖了所有导航系统大系统性能指标的仿真分析。最后,基于此方法采用GALILEO系统相关想定数据对其导航性能指标进行了仿真和试验分析。结果表明,本文所提方法和技术框架能够很好地满足卫星导航系统仿真的特殊需求。
