军用飞机 PHM 系统一体化设计架构分析

军用飞机故障预测与健康管理（PHM）系统设计与工程应用存在设计标准缺失、复杂度高、准确率低等问题。通过对 PHM 系统数据、结构、功能维度的设计需求分析,提出三维多相迭代设计准则;基于三维多相设计准则对 PHM 系统设计流程进行梳理;提出基于软硬件协同加速的健康管理实时化、基于知识图谱的知识逻辑可视化、基于 MBSE ...     

军用航空发动机PHM发展策略及关键技术

提出了军用航空发动机预测与健康管理(prognostics and health management,简称PHM)系统的发展策略和关键技术.首先回顾了国外航空发动机PHM技术的发展历史,简要分析了各个阶段具有代表性的技术特点;其次,详细论述了航空发动机PHM技术发展应当妥善处理的关系和重要问题,主要包括PHM技术发展与空军军事需求、PHM技术发展与技术成熟度体系、立足三代机平台发展PHM技术、在发动机全寿命管理体系引入PHM系统、建议的航空发动机PHM功能和结构等;接着,结合国内技术发展水平,给出了应当重点优先发展关键技术的建议;最后,简要总结了制约国内PHM技术发展的因素,展望了瞄准的技术发展目标.      

航空电子的故障预测与健康管理技术

分析了引发航空电子设备故障的各种因素;详细讨论了航空电子设备全寿命周期内的故障预测与健康管理（PHM）技术,包括故障检测与健康监测、健康信息处理、故障预测和余寿评估;还介绍了基于健康信息综合管理的航空电子PHM系统的设计。     

A novel approach of testability modeling and analysis for PHM systems based on failure evolution mechanism

Prognostics and health management (PHM) significantly improves system availability and reliability, and reduces the cost of system operations. Design for testability (DFT) developed concurrently with system design is an important way to improve PHM capability. Testability modeling and analysis are the foundation of DFT. This paper proposes a novel approach of testability modeling and analysis based on failure evolution mechanisms. At the component level, the fault progression-related information of each unit under test (UUT) in a system is obtained by means of failure modes, evolution mechanisms, effects and criticality analysis (FMEMECA), and then the failure-symptom dependency can be generated. At the system level, the dynamic attributes of UUTs are assigned by using the bond graph methodology, and then the symptom-test dependency can be obtained by means of the functional flow method. Based on the failure-symptom and symptom-test dependencies, testability analysis for PHM systems can be realized. A shunt motor is used to verify the application of the approach proposed in this paper. Experimental results show that this approach is able to be applied to testability modeling and analysis for PHM systems very well, and the analysis results can provide a guide for engineers to design for testability in order to improve PHM performance.     

PHM技术在液压伺服系统中的应用

为了提高液压伺服系统的可靠性和可用性,将故障预测与健康管理（PHM）技术应用到该系统中,并对其核心技术进行研究。重点研究在液压伺服系统的性能发生退化时对该系统进行的故障检测、健康评估及预测。对液压伺服系统PHM技术研究可为系统故障检测、退化评估和寿命预测的工程实践提供有力的理论支撑,并且PHM技术研究是故障诊断技术新的发展方向。最终,实验结果证明了该PHM技术在液压伺服系统故障诊断上的有效性和适用性。     

无人机故障预测与健康管理系统研究

PHM(故障预测与健康管理)技术作为一种新兴的故障诊断与管理方法,能对无人机重要部件、系统进行全面的健康状态监控、故障检测、分析判断处理,因而在无人机技术领域得到广泛重视和长足发展.文章通过对PHM技术的分析研究,搭建了无人机故障预测与健康管理系统的总体框架,并设计了无人机故障预测与健康管理系统模块.     

How Engineers Can Conduct Cost-Benefit Analysis for PHM Systems

Individuals who work in the field of Prognostic and Health Management (PHM) technology have come to understand that PHM can provide the ability to effectively manage the operation, maintenance, and logistic support of individual assets or groups of assets through the availability of regularly updated and detailed health information. Naturally, prospective customers of PHM technology ask: "How will the implementation of PHM benefit my organization?" Typically, the response by individuals in the field is: "Anecdotal evidence indicates that PHM decreases maintenance costs, increases operational availability, and improves safety." This information helps the prospective customer understand the practical benefits of the technology, but that customer stills needs more information to justify their investment in the technology. The customer needs a calculated return on investment (ROI) figure for their particular asset that provides financial assessment of the benefit of the investment. The data, time, and expertise required to conduct a rigorous cost benefit analysis makes the effort seem daunting to the average engineer with little to no fimancial analysis training. The reality is that with a cursory understanding of the asset operation, maintenance, and logistic issues, a useful cost-benefit analysis can be conducted by engineers without business school training. Our purpose herein is to provide a general methodology for conducting a preliminary cost-benefit analysis that calculates an ROI for PHM implementation. We discuss the general types of information needed for the analysis, the quantifying of expected benefits, and the types of supporting data required to validate the benefit assumptions as well as an outline for the costing of PHM technology.     

A novel testability model for health management of heading attitude system

Prognostics and health management (PHM) is very important to guarantee the reliability and safety of aerospace systems, and sensing and test are the precondition of PHM. Integrating design for testability into early design stage of system early design stage is deemed as a fundamental way to improve PHM performance, and testability model is the base of testability analysis and design. This paper discusses a hierarchical model-based approach to testability modeling and analysis for heading attitude system health management. Quantified directed graph, of which the nodes represent components and tests and the directed edges represent fault propagation paths, is used to describe fault-test dependency, and quantitative testability information is assigned to nodes and directed edges. The fault dependencies between nodes can be obtained by functional fault analysis methodology that captures the physical architecture and material flows such as energy, heat, data, and so on. By incorporating physics of failure models into component, the dynamic process of a failing or degrading component can be projected onto system behavior, i.e., system symptoms. Then, the analysis of extended failure modes, mechanisms and effects is utilized to construct fault evolution-test dependency. Using this integrated model, the designers and system analysts can assess the test suite’s fault detectability, fault isolability and fault predictability. And heading attitude system application results show that the proposed model can support testability analysis and design for PHM very well.     

基于PHM技术的导弹维修保障

为解决传统导弹维修保障方法所存在的问题,加快军队信息化建设,提出了基于PHM技术的导弹维修保障方法。分析了不同维修方式、导弹维修保障及信息化建设与PHM技术的关系,利用PHM技术并结合决策支持的思想,建立导弹健康状态的信息管理系统,初步分析了系统的基本结构组成,并结合实际提出了一些需要重点解决的问题。     

飞机预测与健康管理体系结构浅析

飞机预测与健康管理(Prognostics and Health Management,PHM)是以美国JSF飞机为代表的新一代飞机自主后勤概念的核心.PHM技术的应用,有效地降低了飞机全寿命周期的使用维护费用,提高了飞机战备完好率和任务成功率,保证了飞机及其各系统能够安全、可靠、高效地运行.本文在分析了美国JSF飞机...     

故障预测与健康管理(PHM)技术的现状与发展

 结合故障预测与健康管理(PHM)的技术发展过程,阐述了PHM的应用价值。论述了PHM技术系统级应用问题,提出了故障诊断与预测的人-机-环完整性认知模型,并依此对蓬勃发展的故障诊断与故障预测技术进行了分类与综合分析,给出了PHM技术的发展图像。针对故障诊断与预测的不确定性特征,对故障诊断与预测技术的性能要求、定量评价与验证方法进行了分析。最后,以PHM技术的工程应用为线索,提出了PHM技术发展中的几个问题。     

Air transport security and crisis management

Network management is one of the key technologies needed to fulfill the requirements. In other words, a new paradigm for network management is also needed, in order to address the requirements arising both from the ATN side and the telecommunication side of the new telecommunication infrastructure. In particular, the new network management paradigm will incorporate the ATN management framework consisting of related standards, along with the telecommunication management framework, notably Telecommunication Management Network (TMN) standards from ITU-T.     

新会计准则对商业银行的影响

相比《金融企业会计制度（2001）》，新会计准则（2006）做了很多改进，尤其是增加了《金融工具确认和计量》、《金融资产转移》、《套期保值》和《金融工具列报》4个金融工具会计准则，这会对商业银行的财务状况、经营成果、风险管理和内部控制等产生影响，并将对商业银行产生鼓励科技与业务创新、重视人力资源、推动资产重估、促进其财务信息全面披露等导向作用。     

A data-driven health indicator extraction method for aircraft air conditioning system health monitoring

Prognostics and Health Management (PHM) has become a very important tool in modern commercial aircraft. Considering limited built-in sensing devices on the legacy aircraft model, one of the challenges for airborne system health monitoring is to find an appropriate health indicator that is highly related to the actual degradation state of the system. This paper proposed a novel health indicator extraction method based on the available sensor parameters for the health monitoring of Air Conditioning System (ACS) of a legacy commercial aircraft model. Firstly, a specific Airplane Condition Monitoring System (ACMS) report for ACS health monitoring is defined. Then a non-parametric modeling technique is adopted to calculate the health indicator based on the raw ACMS report data. The proposed method is validated on a single-aisle commercial aircraft widely used for short and medium-haul routes, using more than 6000 ACMS reports collected from a fleet of aircraft during one year. The case study result shows that the proposed health indicator can effectively characterize the degradation state of the ACS, which can provide valuable information for proactive maintenance plan in advance.     

中央维护系统概念及其应用

二十世纪八十年代以来,国外航空界研制开发了民用直升机的健康与使用状况监控系统(HUMS),并将这一概念引入军机,先后建立了用于军用直升机的联合先进飞机健康与使用状况监控系统(JAHUMS)项目和用于歼击机的故障预测与健康管理(PHM)项目,本文基于当前国外HUMS的发展状况,借鉴JAHUMS和PHM的构想,将HUMS概念引入到民用固定翼飞机中央维护系统(CMS)中,对CMS概念、应用和其关键技术进行了初步探讨。     

从一起直升机坠海事故探讨适航问题

许多适航标准、技术和管理规则，无论初始适航还是持续适航，都来自于航空事故的教训。因此航空事故调查的意义不仅是查明原因，更重要的是从中吸取教训，改进、提高适航标准、技术和管理，并做到举一反三。就笔者亲身参与调查分析的一起直升机坠海事故，探讨其背后的适航标准、技术和管理问题。     

制约理论(TOC)下的贡献毛益会计研究

制约理论（英文缩写：ＴＯＣ）是以服务于实现企业利润最大化为目的的一种生产经营管理新理念。ＴＯＣ认为：企业经营作为一个系统，总是存在着种种制约因素，而这些制约因素将直接制约着企业目标即企业财富增加的实现；持续不断地发现、改善和消除制约，就可不断增加企业利润；改善和消除制约的过程中，应当遵循“系统中部分最佳的总和不等于系统整体最佳”的原则；寻求实现企业目标的措施时，可将其核心问题归结为三个方面：即保证     

自动测试标记语言及其应用

自动测试标记语言(ATML)作为信息交换媒介可实现包括测试数据、测试资源数据、诊断数据和历史数据等信息共享。由ATML框架和组件标准组成的ATML系列标准为集成测试数据、测试策略和需求、测试步骤、测试结果管理和测试系统实现规定了整体系统环境。文章介绍了如何在某型装备远程测试维修系统中应用ATML来表示测试信息。自动测试标记语言将极大地促进自动测试技术的发展并具有广阔的应用前景。     

民用飞机健康管理技术研究

随着民用飞机的系统集成度和复杂性大大提高,为降低民用飞机的运营成本、提高安全性和可靠性,民用飞机健康管理系统成为航空制造行业的发展趋势。本文简要介绍了民用飞机健康管理技术在国内外的发展现状,现阶段技术条件下所面临的问题以及所涉及的关键技术。着重介绍了民用飞机健康管理技术研究的方法和研究的内容,并对民用飞机健康管理技术未来的发展趋势进行了展望。     

Vehicle health management research for legacy and futureoperational environments

The Air Force will require the ability to diagnose and predict component failures in order to more effectively meet the requirements of the fast and agile Aerospace Expeditionary Force (AEF) and future space vehicles. This paper will cover topics relevant to vehicle health management for current and anticipated support environments. It reflects current projects underway at the Air Force Research Laboratory in the air vehicles and human effectiveness directorates. Specifically, the predictive failures and advanced diagnostics (PFAD) for legacy aircraft, passive aircraft status system (PASS), and the space operations vehicle integrated system (SOVIS) projects will be discussed