基于系统的航空装备外场保障模式研究

通过分析航空侦察装备保障的现状和建立新型航空侦察装备外场保障模式的技术条件,提出了"基于系统"的外场飞行保障新模式,讨论了这种保障模式的特点,以及外场通电、拆装、排故等检查工作情况。     

飞机便携式维修辅助系统

现代飞机航电火控系统功能日益复杂，而测试性设计的不完善，使机内自检(BIT)虚警率、不可复现率及重测合格率成为各型飞机外场保障一大问题，便携式维修辅助系统(PMA)是解决该问题手段之一。该系统作为机内自检的补充，主要功能是增强机载航电设备故障隔离能力、排除正常LRU的不必要更换、综合BIT故障报告、机组和维修人员观察，记录虚警及不可复现故障历史和专家诊断系统从而提高外场保障效率水平。     

军机LRM及其关键技术研究

LRM(外场可更换模块)是第四代军机航电系统的主要特征,对于提高军机战备完好性和降低其全寿命周期费用有着重要意义.分析了航电系统传统结构的不足,指出了基于LRM结构的航电系统的优点,阐述了LRM的设计要求及现有标准,并深入研究了其关键技术,以便为我军新机设计提供参考.     

基于半实物仿真的航空电子装备维护训练系统设计

针对新型机载电子装备维护训练中缺乏实装、无法设置故障等难题,提出了一种基于半实物仿真的训练系统,该系统具有与实装一致的外形和结构,能进行真实度很高的外部检查和拆卸安装训练;具有与实装一致的仿真电路和显控面板,能仿真飞机座舱的通电操作,可灵活设置故障进行排故训练并对训练效果自动评估,该系统可为部队地勤人员一线外场维护的培训提供良好训练条件。     

基于ADS2的航电系统综合测试平台设计与实现

介绍了基于ADS2的航电系统综合测试平台设计方案,通过分析航电系统的基本组成和当前航电系统测试对测试平台的迫切需求,提出构建航电系统综合测试平台的技术方案及测试系统的顶层逻辑架构、物理架构及功能实现.     

基于有向图模型的民机航空电子系统故障诊断

结合民机航电系统外场可更换单元或模块（LRU/LRM）的故障模式及影响分析（FMEA）、故障树 分析和实时性要求,设计了基于时间故障传播图（TFPG）的系统故障诊断元模型和领域模型,研究了基于逻 辑和时间一致性检验的故障诊断算法,使用后向推理和可信度度量列出候选故障集。以飞行管理系统为例,构 造了其功能失效的TFPG 模型,并通过仿真验证了基于TFPG 的诊断在滤除级联效应和关联驾驶舱效应中的有 效性。     

基于新一代模块化航电系统的飞机刹车控制架构研究

综合模块化航空电子设备系统(IMA)已成为机载航空电子设备系统的发展方向。航电设备系统的发展大大拓宽了其职能,传统上一些非航电系统的处理功能,如空调、电源、燃油和起落架等系统也综合了进来;而且,由于采用开放系统结构,无论增加功能或改进都比较容易。基于航电设备的飞机刹车控制已经成为必然,单独的分立的刹车防滑控制装置或控制盒不复存在,其职能宿主于航电系统。本文概述了综合模块化航电设备(IMA)的基本概念,着重论述新一代航电设备的飞机刹车控制架构。     

综合航电系统超短波通信设备的故障隔离

<正>通过分析某型飞机综合航电系统超短波通信设备的结构与特点,提出了外场诊断超短波通信故障的方法。超短波通信是空军作训飞行使用最多的一种通信方式,也是综合航空电子系统中影响飞行安全的主要设备之一。维护好机载超短波通信设备,对完成作训任务、保障飞行安全具有重要意义。     

某型教练机嵌入式训练系统顶层设计技术研究

本文通过对该型教练机现有航空电子系统构型、驾驶员操作程序、接口控制文件深入研究,结合未来功能扩展需求,给出了合理的系统构型分析、功能分配、数据流规划、原相关系统软件改动分析,在此基础上还设计出了嵌入式训练系统技术方案.依据方案研制的嵌入式训练系统原理样机通过系统动态试验、航电系统地面综合试验和飞机地面通电试验,证明系统...     

航电核心处理机接线盒模块的设计与实现

接线盒模块可解决综合模块化航电系统中计算机产品对外调试信号过多、影响设计、且外场维护困难的问题。模块能够有效减少综合处理机对外接口中调试用以太网信号的数量,进而减少外部连接器的使用,利于机载产品的结构和接口设计。模块还支持外场免拆卸产品而实现对产品的调试和维护功能,便于机载产品的外场维护和故障排除。模块采用即用供电设计,既可满足地面开发/调试使用,又可降低飞行状态下的系统功耗。     

一种飞机电子系统寿命及可靠性预估方法

鉴于多种多种因素影响,航电设备实际寿命与OEM设计寿命往往有较大差异。基于此,采用D-S算法,针对某航空公司UNIT-IRU系列部分设备真实服役数据,建立了单一因素融合和多因素融合设备寿命预估及可靠度计算方法。考虑样本规模的限制,略去计算量的细微差异,后一方法将基本分配概率的不确定性由20%降低到5%左右,表明多因素方法预估结果准确性和可靠度更高,实用性更强。     

民用飞机机载维护系统的中央维护功能

描述和分析了民用飞机机载维护系统的中央维护功能,并针对当前模块化航空电子系统发展趋势提出了国产民用飞机机载维护系统的初步研发建议。     

基于虚拟仪器的机载模块性能测试系统

针对传统机载设备侧重于功能测试的技术缺陷,提出了一种机载模块性能测试系统。阐述了测试系统的架构设计和基于LabVIEW的算法实现,使用虚拟仪器技术,实现了航空电子总线ARINC429模块中信号性能的自动测试和故障报告。实验结果表明,该系统能有效完成模块信号性能的自动测试与故障报告,提高了航空电子自动测试设备的通用性与可靠性,对未来两级维修体制下的航空电子设备ATE的发展具有一定的现实意义。     

国外通用开放式结构标准的应用情况

SAE AS4893标准定义的通用开放式结构（GOA）是嵌入式系统的层次化体系结构模型。通过对GOA领域目录集的开发与维护标准化过程的分析,结合GOA在航空电子领域的应用案例展示其标准化技术的应用现状;并考虑到先进综合式航空电子系统在任务功能划分和系统工程方法方面的应用要求,探讨并展望GOA标准化技术应用于新一代航空电子系统开发过程中的注意事项。     

1553 emulation over ATM (asynchronous transfer mode)-a hybridavionics communications architecture

The issue of meeting the higher communications requirements of future aircraft avionics systems in an incremental manner is addressed. A communications architecture is proposed which is based upon a switched network technology from the telecommunications area asynchronous transfer mode (ATM). However, the major step of migrating all existing avionics equipment into an ATM compliant form is avoided by the process of “emulating” a current avionics data bus such as MIL-STD-1553B over an ATM network. This allows current 1553 subsystems to co-exist with ATM compliant equipment on a single physical ATM network     

民机数据总线信号综合测试仪

介绍的民机数据总线信号测试仪综合了当前民机上主要采用的ARINC429、ARINC419、CSDB和RS232等数字式航空数据总线规范的接口，具有和这些总线接口设备通讯的能力，可以灵活方便地应用于机载设备检测，装机交联实验当中。     

Avionics cost of ownership

The cost of ownership of avionics includes not only the development and acquisition cost, but also the yearly operating and support (O and S) (maintenance) cost of hardware, software, and support equipment. This paper presents an avionics cost of ownership methodology developed for USAF, its data sources, and business metrics computed for USAF decision makers as we move toward operating avionics as a business. The business model is used to determine which existing avionics are candidates for replacement with new technology and to prioritize the replacements. These avionics are often used on multiple aircraft types which necessitates analysis of the causes of the high cost of ownership on each type. Databases are used to document the processing functions, data flow, and constraints of the item being analyzed. These constraints include physical, environmental, electrical, and data interfaces. Databases containing alternatives are evaluated against standard mission scenarios for aircraft utilizing these high cost avionics to determine their impact on performance, O and S costs, and mission effectiveness. The results of the foregoing analyses steps are then used in life cycle cost analyses which consider different retrofit scenarios for each alternative for each aircraft type against the avionics being analyzed for replacement. The alternatives are prioritized and a risk analysis performed considering technical, schedule, and cost growth risks. The avionics cost of ownership methodology described in this paper processes data from USAF maintenance organizations. This has revealed the very large expenditures being made to support highly unreliable avionics. These methods can be applied to all military and commercial aircraft systems to determine not only the cost of ownership of existing systems, but also the cost of ownership of new systems when they are retrofit     

基于标准总线的航电系统测试与维护策略

随着航电系统越来越依赖于复杂的电子系统,以及电子产品的微型化,测试成为解决航电系统可靠性和维修性的关键。在分析基于标准测试总线的测试性技术的标准体系之后,介绍了将边界扫描技术应用于板级测试,系统级测试以及产品现场维护的测试性设计的一种方法。     

基于模型的航空电子系统体系化需求分析与仿真

借鉴体系工程思想及体系结构设计方法,结合航空武器装备需求论证实践,提出基于模型的航空电子系统体系化需求分析与仿真方法,以及体系架构模型协同仿真环境设计方案,能够有效支撑航空电子体系化需求论证和顶层设计,具有重要的理论价值和实践意义。     

Open systems architecture solutions for military avionics testing

Raytheon makes extensive use of open systems architecture methods in developing special test equipment (STE) for testing military avionics equipment. Such use has resulted in significant cost and schedule savings in the development of production test equipment for radar and infrared systems. With open systems architectures, a test system can be assembled using COTS products. This brings economies of scale to test equipment, which is normally built in very low quantities. Therefore, the potential cost savings due to COTS usage is proportionately greater in STE than in the higher volume avionics systems that are tested. A second major benefit of using COTS products is that test system development schedule cycle time is greatly reduced. This paper describes the application of Open Systems Architectures (OSA) to avionics testing. The following major architectures are surveyed: VME bus, VXI bus, IEEE GPIB, IEEE 1149.1 JTAG test bus, 1553 Military Bus, Fibre Channel, and COTS Test Applications Software. We describe how the benefits of OSA have been extended at Raytheon into achieving vertical test commonalities. The flexibility of OSA can be exploited to provide an overall optimum test solution, taking all levels of test into account. For example, test systems can be tailored with COTS products to provide integrated methods for avionics tests at the module, unit, and system levels. Test systems can be configured to maximize the reuse of COTS hardware over all test levels. Test software can also be programmed to optimize such reuse over levels of test. Additional test verticality synergies derived from such OSA usage are described, including: test false alarm avoidance; test cones of tolerance optimization; and efficient test of field returns