固定资产价值评估方法的探讨

本文通过了对影响固定资产价值的各种因素的分析，指出了成新率指标是影响固定资产价值的关键因素，探讨了运用模糊教学的二级综合评价法求出成新率，进而确定固定资产价值的方法。     

Energy absorption features of 3-D braided rectangular composite under different strain rates compressive loading

There are huge potential applications of 3-D braided composite in aerospace engineering because of the non-delamination feature of the composite under impact loading. This paper presents the analysis of energy absorption features of 3-D braided composite under compression with different strain rates. The 3-D 4-step rectangular braided composite coupons were tested on a material tester MTS 810.23 and a split Hopkinson pressure bar (SHPB) apparatus to obtain out-of-plane and in-plane compression stress vs. strain curves at quasi-static and high strain rate state. The failure modes and energy absorption features of the 3-D braided composite under different strain rates were analyzed both in time domain and frequency domain. The energy absorbed by the 3-D braided composite increases with the strain rate. From fast Fourier transform (FFT) analysis of compression stress vs. time histories, the power of energy absorption of the 3-D braided composite increases with strain rate and mostly concentrate on the high frequency region. While for quasi-static compression, the power distributes in very narrow frequency region and also is less than that in high strain rates. This feature corresponds to the different damage and energy absorption mechanisms of the 3-D braided composite under quasi-static and high strain rate compression.     

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.     

基于使命任务分解的航空电子跨平台通信组织与仿真

在先进的综合化航空电子系统设计中,跨平台通信的组织将直接体现使命任务的需求。通过功能流程框图将航空电子系统使命任务各个阶段分解为功能组件,给出了一种功能组件之间跨平台信息交互的组织方法,并采用移动自组织通信的方式实现。将某任务片段中的空中图像信息传输作为模拟案例,使用OPNET软件进行仿真研究。仿真结果表明,该方法根据任务的特性设定平台之间的动态通信过程,与没有经过使命任务分解设计的对照组相比,在同等发射功率下能够有效地降低误码率。     

如何规范航空货运市场的运价

目前航空货运市场的价格战正在引起每一位民航人士的高度关注。主要有5种原因引起价格体系的剧烈波动,建议在价格制订中引入博弈论的思想,成立相关的委员会,引导货运代理人走专业化道路,形成服务—价格组合权等,通过这些措施规范航空货运市场。     

平台压强指数附加物“TCA”与配方组分粒度和含量的关系

较详细地叙述了平台推进剂压强指数附加物“ＴＣＡ”与推进剂组与的粒度、含量的关系。     

串联密封系统泄漏率的测定

从理论上讨论了用常规氦质谱仪检漏方法测定两密封件串联密封的气路系统各密封件“单密封”泄漏率的问题。给出了解析结果， 所得出的结论应用在工程实践中有利于提高产品质量， 具有经济价值。     

应答式无线报警系统

应答式无线报警系统是一套规范化无线报警设备,它采用了MCS—51单片微机作为控制,从而使系统具有电路简单、性能可靠、控制灵活、成本低廉、操作简单、信息指示直观明了等特点,具有较强的科学性和先进性。     

时间序列分析法预测某型飞机的故障率

采用时间序列分析法某型飞机的故障率进行预测，其可为可靠性维修提供理论依据。     

一种镁铝贫氧推进剂燃速标准物质研究

以成熟的镁铝贫氧推进剂配方为基础选择标准物质的候选物,确定了合理的试样尺寸和制备工艺,制备出均匀性和稳定性良好的镁铝贫氧推进剂燃速标准物质,并分析了影响该燃速标准物质不确定度的因素。结果表明,镁铝贫氧推进剂燃速标准物质可满足燃速特性量值传递的需要,可确保测试结果准确可靠。