技术状态管理的现状和发展设想

技术状态管理是系统工程管理的一个重要组成部分，用于对系统的定义和控制。准确地掌握和控制每个零件的功能特性和物理特性，以及所依据的技术文件（设计图样、设计／试验文件、工艺文件、更改文件等）的状态，是飞机研制技术状态管理的重要内容。     

军机研制中的需求管理、接口管理与技术状态管理研究

为提高军机研制系统工程管理能力,从需求管理、接口管理与技术状态管理的内涵和关联入手,提出了 三者一体规划、实施的理念,构建了以技术状态项为核心的综合管理架构和逻辑,有助于军机研制技术管理工作的效率和质量提升。     

企业计量工作要适应新机制要求

现代管理对企业计量工作提出了新的要求，它与传统的计量管理有较大区别，主要表现在以下几个方面：①传统的企业计量管理是在计划经济下，主要靠国家的政策来规范和指导，由政府对企业进行考核，采用计量定级升级的行政指令办法，要求企业建立计量机构、配备计量人员和计量器具，强调计量工作统一归口管理。而现代企业的计量工作，应按市场经济的要求，根据生产经营过程中，质量管理和质量保证的需要，自主健全和完善企业的计量保证体系．为确保产品质量提供可靠的技术保证。②传统的企业计量管理只强调计量器具的管理，要求对计量器具的配…     

提高资金动作效益的探索

资金管理是成本管理的中心，公司财务部门加强对筹资、用资环节的管理，保证了科研生产的顺利进行。     

新形势下增强工厂计量活力的探讨

ExplorationofEnhancingFactoryMeasurementActivityinNewSituationPanJiucheng当前，全国各企业都在贯彻落实十四大精神，进一步深化改革、转换经营机制，并将企业推向市场，实行社会主义市场经济，增强企业活力。就我厂而言，改革现有体制与经营机制，划小经济核算单位，实行承包经营、独立核算，成了目前深化改革的主流，工厂的计量部门也不例外。那么在这样的形势下，工厂计量部门如何依靠自身力量养活职工，并进一步调动职工的积极性，挖掘潜力，发挥优势，增强活力，为工厂和自身取得更好的经济效益呢？本文对此进行一些探讨。lbD…     

未来空管发展之展望

民航总局在2003年年初提出了今后二十年内民航的发展目标，其中“建成现代化的空中交通管理系统，其技术设备、服务手段和管理水平达到世界先进水平，空域资源要得到充分有效的利用。”是针对我们空管系统所提出的目标规划，对于建成现代化的空中交通管理系统的总体建设思路是：以管制需求为先导，以三大管制中心建设为龙头，以航路通信和二次雷达建设为主线，以通信网络和信息化建设为依托，以区域化和系统化建设为组织实施方式，以技术培训和规章建设为保障手段，东部和中部地区积极推进雷达管制建设，西部地区完善程序管制建设并积极应用ADS等新技术。     

学生成绩管理及学费管理信息系统的软件开发

本文详细介绍了沈阳航空工业学院学生成绩管理及学费管理信息系统的功能及实现技术。此系统基于校园网环境，实现了教务管理中的成绩管理、学费管理及有关的各项统计。     

国有企业管理弱化的哲学反思

国有企业的管理弱化一方面表现为管理思想、管理手段和管理技术的落后，而更重要的一方面是管理的基本矛盾没有解决。仅仅从技术层面推进国有企业的改革，只能是治标不治本的权宜之计。本文从管理哲学的高度分析了导致国有企业管理弱化的矛盾，指出了国有企业进一步演化改革需要着重解决的问题。     

车间生产现场管理的条件改善性试探

本文从当前公司各车间的生产现场存在的不良现象出发，分析了对车间生产现场管理条件进行改善的重要性及必要性，并就车间生产现场管理条件所需改善的各个方面进行了探讨。     

Simulation and Analysis of Crashworthiness of Fuel Tank for Helicopters

Crashworthiness requirement of fuel tanks is one of the important requirements in helicopter designs. The relations among the protection frame, textile layer and rubber layer of the fuel tank are introduced. Two appropriate FE models are established, one is for an uncovered helicopter fuel tank without protection frame, and the other is for fuel tank with protection frame. The dynamic responses of the two types of fuel tanks impinging on the ground with velocities of 17.3 m/s are numerically simulated for the purpose of analyzing energy-absorbing capabilities of the textile layer and protection frame. The feasibility of the current crashworthiness design of the fuel tank is examined though comparing the dynamic response behaviors of the two fuel tanks.     

Nonlinear Adaptive Slewing Motion Control of Spacecraft Truss Driven by Synchronous V-gimbaled CMG Precession

The slewing motion control of a truss arm driven by a V-gimbaled control-moment-gyro (CMG) is a nonlinear control problem. The V-gimbaled CMG consists of a pair of gyros that must precess synchronously. The moment of inertia of the system, the angular momentum of the gyros and the external disturbances are not exactly known. With the help of feedback linearization and recursive Lyapunov design method, an adaptive nonlinear controller is designed to deal with the unknown items. Performance of the proposed controller is verified by simulation.     

The effect of inlet conditions on the flow and heat transfer in multiple rotating cavity with axial throughflow

This paper discusses experimental results from two different build configurations of a heated multiple rotating cavity test rig.Measurements of heat transfer from the discs and tangential velocities are presented.The test rig is a 70% full scale version of a high pressure compressor stack of an axial gas turbine engine.Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of these with a central axial throughflow of cooling air.Tests were carried out for a range of non-dimensional parameters representative of high pressure compressor internal air system flows(Re up to 5×106 and Rez up to 2×105).Two different builds have been tested.The most significant difference between these two build configurations is the size of the annular gap between the(non-rotating) drive shaft and the bores of the discs.The heat transfer data were obtained from thermocouple measurements of surface temperature and a conduction solution method.The velocity measurements were made using a two component,LDA system.The heat transfer results from the discs show differences between the two builds.This is attributed to the wider annular gap allowing more of the throughflow to penetrate into the cavity.There are also significant differences between the radial distributions of tangential velocity in the two builds of the test rig.For the narrow annular gap,there is an increase of non-dimensional tangential velocity V/Ωr with radial location to solid body rotation V/Ωr=1.For the wider annular gap,the non-dimensional velocities show a decrease with radial location to solid body rotation.      

Experimental Study on Effects of Fuel Injection on Scramjet Combustor Performance

In order to investigate the effects of fuel injection distribution on the scramjet combustor performance, there are conducted three sets of test on a hydrocarbon fueled direct-connect scramjet test facility. The results of Test A, whose fuel injection is carried out with injectors located on the top-wall and the bottom-wall, show that the fuel injection with an appropriate close-front and centralized distribution would be of much help to optimize combustor performances. The results of Test B, whose fuel injection is performed at the optimal injection locations found in Test A, with a given equivalence ratio and different injection proportions for each injector, show that this injection mode is of little benefit to improve combustor performances. The results of Test C with a circumferential fuel injection distribution displaies the possibility of ameliorating combustor performance. By analyzing the effects of injection location parameters on combustor performances on the base of the data of Test C, it is clear that the injector location has strong coupled influences on combus- tor performances. In addition, an inner-force synthesis specific impulse is used to reduce the errors caused by the disturbance of fuel supply and working state of air heater while assessing combustor performances.     

高超声速飞行器表面温度分布与气动热耦合数值研究

针对高超声速飞行器热防护设计中的高温气体非平衡效应问题和气动热环境精确预测问题,基于流场的非平衡Navier-Stokes方程、表面的能量守恒方程和内部的热传导方程,考虑流场的非平衡效应、表面的热辐射效应、催化效应和烧蚀效应以及热防护层内部的热传导效应,建立了初步的表面温度分布与气动热的耦合计算方法,完善了高超声速飞行器气动物理流场计算软件(AEROPH_Flow)。在表面材料为碳-碳(C-C)条件下,对飞行高度为65km和飞行速度为8,10km/s的半球以及飞行高度为50km和飞行速度为8km/s的球锥模型,开展了表面温度分布与气动热的耦合计算,验证了计算方法和计算软件,分析了表面温度分布对气动热环境的影响。研究结果表明:表面温度分布对气动热的计算结果有较大影响,在气动热环境的预测中,不仅要考虑热化学非平衡效应和表面催化效应的影响,还要考虑表面温度分布的影响,最好是采用表面温度分布与气动热耦合计算的方法,以减小表面温度分布对气动热计算结果的影响。为此,需要发展完善非平衡流场/表面催化和烧蚀/热传导温度场(气/表/固)的计算模型、耦合求解技术和计算软件,实现对高超声速飞行器的真实飞行条件下高温气体非平衡效应和气动热环境的精确模拟。     

Investigation on the Thermal Conductivity of 3-Dimensional and 4-Directional Braided Composites

It is vital to choose a factual and reasonable micro-structural model of braided composites for improving the calculating precision of thermal property of 3-D braided composites by finite element method (FEM). On the basis of new microstructure model of braided composites proposed recently, the model of FEM calculation for thermal conductivity of 3-dimennsional and 4-directional braided composites is set up in this paper. The curves of coefficient of effective thermal conductivity versus fiber volume ratio and interior braiding angle are obtained. Furthermore, comparing the results of FEM with the available experimental data,the reasonability and veracity of calculation are confirmed at the same time.     

方波幅度的测量不确定度

介绍了用众数法评价方波幅度时的不确定度分析和评价过程；讨论了主要的不确定度来源，包括众数判别区间的影响、波形测量系统幅度测量误差的影响等等；给出了减小不确定度的主要措施，并结合一个实例，给出了方波幅度的不确定度评价结果。     

Effects of Mo on the Microstructure and Hydrogen Sorption Properties of Ti-Mo Getters

The effects of Mo on the microstructure evolution, porosity and hydrogen sorption properties of Ti-Mo getters are investigated in this work. The results show that the addition of Mo prolongs the densification process of Ti-Mo getters and results in a significant amount of sintered pores. With the Mo content increasing, the porosity of getters firstly increases reaching the maximum value as it at- tains about 7.5wt.%, and then drops. At the room temperature, the hydrogen sorption property of getters increases progressively with the Mo content increasing, but the tendency is not very clear before its content lies below 2.5wt.%. When the Mo content achieves about 7.5wt.%, the hydrogen sorption property proves to be the best. The discussion is made about the above mentioned phenomena inclusive of hydrogen sorption properties of getters under different activation conditions (from 500-750 ℃).     

Large Amplitude Flexural Vibration of the Orthotropic Composite Plate Embedded with Shape Memory Alloy Fibers

研究了形状记忆合金(SMA)纤维混杂复合材料大挠度层合板的非线性自由与受迫振动特性。基于描述SMA力学行为的Brinson理论以及层合板材料性能预测的混合率,建立了SMA纤维混杂复合材料大挠度层合板的本构方程,基于对称层合各向异性弹性板的非线性理论,建立了以横向挠度和应力函数表示的板的横向振动方程和相容方程。采用Galerkin近似解法将振动方程化为时间变量的含有3次非线性项的Duffing型常微分方程,采用谐波平衡法(HBM)获得系统的固有频率方程和强迫振动稳态频率响应方程。数值计算表明,非线性板自由振动频率比与激励温度的关系具有与线性板相同的特征,马氏体相向奥氏体相转变阶段温度对板的振动频响特性曲线的影响最显著,同时也讨论了SMA纤维含量、板的纵横比以及自由振动幅值对板的非线性频率比的影响。     

临近空间飞行器测控与信息传输系统频段选择

 临近空间飞行器是高性能信息化武器平台,测控（TT&;C）与信息传输系统是其信息保障的核心,而选择合理、可行的频段是展开系统设计的前提和基础。频段选择影响到整个技术方案的制定,是一个需综合考虑、影响深远并具有战略意义的关键问题,从国际电联（ITU）国际标准、高速数传、接收信噪比（SNR）、“三抗”、超视距中继、黑障、雨衰以及设备研制成熟度8个方面全面、细致论证了近空间平台测控系统的频段选择问题,最终得出在视距链路中以Ka频段为宜,在超视距链路中以Ku/Ka双频段为宜的结论。