谈当代大学生的心理困惑

从社会问题、学习、人际交流、情感四个方面分析了目前在技大学生心理矛盾和困惑的表现及原因。     

大学生心理健康之情商水平分析

利用情绪稳定性测试量表，对我院2000级9个系130名大学生的情绪水平进行了测试。结果显示大学生情商水平较低，其中农村生、文科生和女生的情商水平低于城市生、理科生和男生。应采取有效措施，努力提高我院大学生的情商水平。     

精确空袭--美军实施"非接触作战"的王牌

扼要介绍了美国精确制导武器技术的新发展和美国空军精确空袭作战的现状和未来.     

乙烯简化化学动力学模型在HIFiRE燃烧室计算中的应用

为评估化学反应动力学模型对超燃冲压发动机计算结果的影响,首先利用基于"准稳态"假设方法建立了复杂化学反应动力学模型简化软件包(SPARCK),从详细模型出发得到了一个包含20组分16步总包反应的乙烯简化动力学模型.然后采用该简化模型和Princeton大学的简化模型对乙烯点火延迟时间进行了计算,对比显示两个简化模型计算结果基本一致,与实验测量结果均吻合较好,都能准确反映乙烯点火特性.但对HIFiRE燃烧室直连式实验的数值模拟结果显示两个模型计算得到的燃烧流场静温分布差别较大,内流道推力性能相差近12%.相比于Princeton大学的简化模型,SPARCK软件得到的简化模型计算的壁面压力分布与实验结果吻合更好,能够准确描述燃烧室流场现象.     

充气式月球基地防护结构技术综述

综述了充气式月球基地防护结构技术,包括总体设计要求和关键设计要点、柔性热防护结构的服役环境、功能需求、设计方法、材料选用等。并从结构冲击定位和强度分析、破坏响应分析、系统组成分析和自修复材料等方面,指出了对结构进行健康监测的必要性。介绍了现有的地面测试技术,包括热防护材料性能测试、展开动力学性能测试和太空环境模拟技术等,最后对防护结构技术的发展方向进行了展望。     

弱模型依赖通用智能姿态控制技术

超高速跨域飞行、敏捷机动等是新一代飞行器发展方向,而长时高速飞行产生的气动外形变化带来的气动参数大范围改变等问题,都对控制系统设计提出了更高的要求。为提高飞行器对模型不确定性的适应能力及控制方法对不同外形、复合执行机构的通用性,深入研究了弱模型依赖的通用智能姿态控制技术,分层次地开展了基于深度学习(DL)的自适应姿态控制、基于深度确定性策略梯度算法(DDPG)的通用姿态控制、弱模型依赖的多维复合控制等技术研究,显著提高了控制系统的鲁棒性和通用性,对人工智能技术在飞行器姿态控制中的应用具有一定的指导意义。     

飞机增稳系统的耗散控制问题研究

讨论了飞机增稳系统的耗散控制问题．首先将增稳系统的运动方程简化为定常线性系统;其次,研究系统的耗散性分析;再次,设计状态反馈控制器使得系统的闭环系统耗散;最后,通过数值仿真验证了方法的可行性。     

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.     

波音737NG飞机引气系统健康检查定制与专用设备的应用

介绍了波音737NG飞机引气系统健康检查项目的目标,采用波音C36001-44设备进行此项检查的具体实施方案,并介绍了国航自行研制的专用设备波音737NG引气系统健康诊断仪,及其与C36001-44在健康检查中的实际效果对比。3国航股份工程技术分公司贵阳维修基地4国航股份工程技术分公司重庆维修基地     

Dual smoothing ionospheric gradient monitoring algorithm for dual-frequency BDS GBAS

In this study, a Dual Smoothing Ionospheric Gradient Monitor Algorithm (DSIGMA) was developed for Code-Carrier Divergence (CCD) faults of dual-frequency Ground-Based Augmentation Systems (GBAS) based on the BeiDou Navigation Satellite System (BDS). Divergence-Free (DF) combinations of the signals were used to form test statistics for a dual-frequency DSIGMA. First, the single-frequency DSIGMA was reviewed, which supports the GBAS approach service type D (GAST-D) for protection against the effect of large ionospheric gradients. The single-frequency DSIGMA was used to create a novel input scheme for the dual-frequency DSIGMA by introducing DF combinations. The steady states of the test statistics were also analysed. The monitors were characterized using BDS measurement data, whereby standard deviations of 0.0432 and 0.0639 m for the proposed two test statistics were used to calculate the monitor threshold. An extensive simulation was designed to assess the monitor performance by comparing the Probability of Missed Detection (PMD) according to the differential error with the range domain PMD limits under different fault modes. The results showed that the proposed algorithm has a higher integrity performance than the single-frequency monitor. The minimum detectable divergence with the same missed probability is less than 50% that of GAST-D.