Modeling of reliability and performance assessment of a dissimilar redundancy actuation system with failure monitoring

Actuation system is a vital system in an aircraft, providing the force necessary to move flight control surfaces. The system has a significant influence on the overall aircraft performance and its safety. In order to further increase already high reliability and safety, Airbus has imple-mented a dissimilar redundancy actuation system (DRAS) in its aircraft. The DRAS consists of a hydraulic actuation system (HAS) and an electro-hydrostatic actuation system (EHAS), in which the HAS utilizes a hydraulic source (HS) to move the control surface and the EHAS utilizes an elec-trical supply (ES) to provide the motion force. This paper focuses on the performance degradation processes and fault monitoring strategies of the DRAS, establishes its reliability model based on the generalized stochastic Petri nets (GSPN), and carries out a reliability assessment considering the fault monitoring coverage rate and the false alarm rate. The results indicate that the proposed reli-ability model of the DRAS, considering the fault monitoring, can express its fault logical relation and redundancy degradation process and identify potential safety hazards.     

农林飞机超低空飞行大气紊流影响研究

在建立农林飞机超低空飞行时的大气紊流模型基础上,结合频域和时域两种计算方法研究了各种不同紊流强度下的大气紊流对农林飞机超低空飞行的影响,同时采用加速度综合评分的方法对其影响进行定量评估,最后给出了大气紊流对农林飞机超低空飞行影响的规律,对工程应用有一定的参考价值。     

绩效显现时滞与动态测评

为了提高考核工作的精确性，笔者设计了一种新的考核方法－岗位绩效指数化方法。其核心是将考核对象的业绩与所确定的岗位指数之间进行比较，使原有的不确定因素和不可控因素在固定的岗位绩效面前有相对清晰的显现，从而使考核有较为现实的依据。但在具体操作过程中，必须解决岗位绩效显现时滞对绩效评估结果的影响问题。     

MPP蛀孔互联网的模拟研究

蛀孔交换技术的特性不同于存储转发交换技术的特性。该文分析了消息在重载蛀孔网络中传输的性能特性，指出了在典型的二维MESH网中应用蛀孔技术的障碍。在此基础上提出了二维MESH的一种改进结构，即间接二维MESH结构，并分析、模拟了该结构在各种网络负载及各种网络规模下的性能特性。分析及模拟都说明了该结构的高效性。     

河南省金融产业竞争力评价与对策

以河南省为研究重点，选取了31个省份作为对照样本，这用主成分和因子分析法对各个区域的金融产业竞争力进行计量分析和排序，结果认为，东部地区金融产业竞争力仍然保持着绝对优势地位，中部六省中，河南省的金融产业竞争力发挥着龙头作用，被划入我国区域金融产业发展的前三个梯度内，表现出良好的发展态势。在对金融产业竞争力的模糊曲线分析后认为，影响金融产业竞争力提高的八个分力，依其重要程度依次为经济力、科技力、文化力、开放力、设施力、劳动力、聚集力和环境力，均对其产生正向贡献。因此，提高河南省金融产业竞争力，主要应从以下方面入手：（1）促进河南省经济的继续增长，努力提高人均可支配收入水平。（2）做好对内对外开放，尤其是针对不同区域有针对性地扩大对外开放与区际开放。（3）完善对外金融交往基础设施，加强政府的监管效率。（4）拓展河南金融业的发展空间，充分发挥其就业效应。（5）进一步加大科技成果的转化。（6）加强区域向心吸引力，促进产业集聚。（7）加强文化建设，完善金融生态环境。     

An experimental analysis of situation awareness for cockpit display interface evaluation based on flight simulation

Aircraft cockpit display interface (CDI) is one of the most important human-machine interfaces for information perceiving. During the process of aircraft design, situation awareness (SA) is frequently considered to improve the design, as the CDI must provide enough SA for the pilot to maintain the flight safety. In order to study the SA in the pilot-aircraft system, a cockpit flight simulation environment is built up, which includes a virtual instrument panel, a flight visual display and the corresponding control system. Based on the simulation environment, a human-in-the-loop experiment is designed to measure the SA by the situation awareness global assessment technique (SAGAT). Through the experiment, the SA degrees and heart rate (HR) data of the subjects are obtained, and the SA levels under different CDI designs are analyzed. The results show that analyzing the SA can serve as an objective way to evaluate the design of CDI, which could be proved from the consistent HR data. With this method, evaluations of the CDI design are performed in the experimental flight simulation environment, and optimizations could be guided through the analysis.     

企业文化定量评价方法的研究

针对目前评价企业文化的方法在定量分析方面的不足，应用模糊数学理论建立了一个企业文化模糊综合评价模型是一个企业文化产例加以说明，为企业家决策提供科学依据。     

航天器项目群管理模式探讨

阐述了我国现有航天器多项目管理的模式和特点,在分析我国航天器项目管理发展基础上,根据航天器研制任务急剧增长的情况提出了项目群管理的概念和项目群管理模式的思路,为寻找更好的适合航天器快速发展的项目管理方法提供参考。     

数字存储示波器的原理,特点及发展动态

较全面的描述了示波器的发展动态，着重分析了数字示波器的工作原理、功能和特点。最后介绍了国外最新动态。     

面对面平行度误差的数学模型

简要地叙述了面对面平行度误差的正交最小二乘评定法和最小条件评定法,并分别建立了评定面对面平行度误差的数学模型。该原理可扩展到其他平行度误差的评定。