航空电子全双工交换式以太网(AFDX,Avionics Full Duplex Switched Ethernet)技术基于IEEE802.3以太网和TCP/IP通用原理,对于商用货架(COTS)网络化技术如何应用于未来飞机数据网络给出了定义[1],已经成为了一种新的航空电子数据网络标...航空电子全双工交换式以太网(AFDX,Avionics Full Duplex Switched Ethernet)技术基于IEEE802.3以太网和TCP/IP通用原理,对于商用货架(COTS)网络化技术如何应用于未来飞机数据网络给出了定义[1],已经成为了一种新的航空电子数据网络标准。由于AFDX协议以及航空总线布局的复杂性,采用网络仿真技术可以大大缩短网络建设周期,减小网络建设的投资风险。为了模拟AFDX的网络性能,尤其是其在数据通信方面的高可靠性和高实时性,根据AFDX协议及其传输和交换原理,建立了基于高级仿真体系结构(HLA)的AFDX分布式仿真体系,并对各子系统的构成以及仿真执行流程进行了研究。通过对仿真结果的分析,验证了仿真模型的正确性,并表明仿真设计满足系统性能要求。展开更多
随着航空运输业的快速发展,传统的基于飞行程序的燃油预测无法再精确计算飞机携带的燃油量,因此如何精确地进行燃油预测成为各大航空公司稳健发展的重要目标。为了更科学地解决燃油决策量问题,首先对航迹数据进行处理,以便在计算燃油消...随着航空运输业的快速发展,传统的基于飞行程序的燃油预测无法再精确计算飞机携带的燃油量,因此如何精确地进行燃油预测成为各大航空公司稳健发展的重要目标。为了更科学地解决燃油决策量问题,首先对航迹数据进行处理,以便在计算燃油消耗(简称油耗)中使用,然后依据飞机数据基础用户手册(BADA,user manual for the based of aircraft data)数据库的油耗计算方法,在假定各航段燃油消耗率恒定的情况下建立了飞机下降进近阶段的油耗模型,并通过对所得油耗数据进行分析,提出某一飞行阶段航空公司的燃油携带建议值,最后依据中国民用航空西南地区空中交通管理局云南分局提供的雷达航迹数据进行仿真验证,验证了所设计的油耗模型较之前的传统方法更准确可行。展开更多
Nonhydrostatic mesoscale WRF and its 3D-Var system are used to study a dense fog event occurring in 13-14 January 2006. Three different observation data sets including GTS （Global Telecommunication System）, AMDAR （...Nonhydrostatic mesoscale WRF and its 3D-Var system are used to study a dense fog event occurring in 13-14 January 2006. Three different observation data sets including GTS （Global Telecommunication System）, AMDAR （Aircraft Meteorological Data Relay） data, and 9210 data are assimilated into the initial analysis fields in experiments. Experiments with three different assimilation time intervals （1, 3, and 6 h） are also carried out. Three experiments with different data sets have all modified the temperature and humidity field of initial fields, and therefore show an obvious positive effect on fog simulation. Further study indicates that the humidity and stability of boundary layer are improved obviously in assimilation experiments, although different data sets make different contribution to the analysis fields. The multi-time assimilation cycle experiments show that the analysis increment in experiment with l-h interval is more realistic than that with 3- and 6-h intervals.展开更多
文摘航空电子全双工交换式以太网(AFDX,Avionics Full Duplex Switched Ethernet)技术基于IEEE802.3以太网和TCP/IP通用原理,对于商用货架(COTS)网络化技术如何应用于未来飞机数据网络给出了定义[1],已经成为了一种新的航空电子数据网络标准。由于AFDX协议以及航空总线布局的复杂性,采用网络仿真技术可以大大缩短网络建设周期,减小网络建设的投资风险。为了模拟AFDX的网络性能,尤其是其在数据通信方面的高可靠性和高实时性,根据AFDX协议及其传输和交换原理,建立了基于高级仿真体系结构(HLA)的AFDX分布式仿真体系,并对各子系统的构成以及仿真执行流程进行了研究。通过对仿真结果的分析,验证了仿真模型的正确性,并表明仿真设计满足系统性能要求。
文摘随着航空运输业的快速发展,传统的基于飞行程序的燃油预测无法再精确计算飞机携带的燃油量,因此如何精确地进行燃油预测成为各大航空公司稳健发展的重要目标。为了更科学地解决燃油决策量问题,首先对航迹数据进行处理,以便在计算燃油消耗(简称油耗)中使用,然后依据飞机数据基础用户手册(BADA,user manual for the based of aircraft data)数据库的油耗计算方法,在假定各航段燃油消耗率恒定的情况下建立了飞机下降进近阶段的油耗模型,并通过对所得油耗数据进行分析,提出某一飞行阶段航空公司的燃油携带建议值,最后依据中国民用航空西南地区空中交通管理局云南分局提供的雷达航迹数据进行仿真验证,验证了所设计的油耗模型较之前的传统方法更准确可行。
基金Supported by the Ministry of Science and Technology of PRC under Contracts 2006BAC02B01National Natural Science Foundation of China under Grand Nos.40675022 and 60572184.
文摘Nonhydrostatic mesoscale WRF and its 3D-Var system are used to study a dense fog event occurring in 13-14 January 2006. Three different observation data sets including GTS （Global Telecommunication System）, AMDAR （Aircraft Meteorological Data Relay） data, and 9210 data are assimilated into the initial analysis fields in experiments. Experiments with three different assimilation time intervals （1, 3, and 6 h） are also carried out. Three experiments with different data sets have all modified the temperature and humidity field of initial fields, and therefore show an obvious positive effect on fog simulation. Further study indicates that the humidity and stability of boundary layer are improved obviously in assimilation experiments, although different data sets make different contribution to the analysis fields. The multi-time assimilation cycle experiments show that the analysis increment in experiment with l-h interval is more realistic than that with 3- and 6-h intervals.
