在协议集成测试系统上开展路由协议测试

在分析路由协议的特性及其测试需求的基础上，提出利用窗口黑盒来描述被测协议，利用多通道测试方法扩展对被测实现的控制和观察，通过扩充参考实现增强系统的测试能力。将这些理论，技术应用于系统中，对路由协议开展了有效的测试活动，为国产高性能路由器的开发提供了有力的支持，也进一步增强了PITS系统的功能和适用性。     

一种基于并发TTCN的FTP协议一致性测试研究

在TCP/IP协议族的应用层协议中，文件传输协议FTP具有很强的代表性。应用层协议的一致性测试，目前在国内尚未提上日程，国外则主要集中在协议分析（protocol analysis）上，本文介绍了TCP/IP协议一致性测试现状；研究以协议集成测试系统为测试平台，采用并发TTCN测试集描述语言，对FTP进行一致性测试的方法；并对应用层协议测试进行了一般性的总结。     

基于SNMP协议的分布式网络性能测试与分析

针对网络性能优化对提高网络运行效率的重要作用,采用基于网络性能评测的方法寻找影响网络运行效率的瓶颈,以及进行相关优化的方式,在具体实现上采用基于简单网络管理协议(SNMP)、RFC 2544协议和分布式软件测评体系结构相结合方式进行网络性能测评。最终通过测试结果来进一步说明分布式网络性能测试解决方案。     

结合C-TTCN和全局行为分析的路由协议一致性测试

以路由协议OSPF（Open Shortest Path First)的LSDB（Link State DataBase)同步过程为例，提出一种测试架构，将C－TTCN（Concurrent Tree and Tabular Combined Notation)测试模型和全局行为分析器融于一体，降低了C－TTCN测试例编写难度并提高了测试系统的错误检测能力。     

协议分布式测试系统的性能模型

协议测试领域专家们已经达成共识：新一代的协议测试系统应该是分布式架构的。本文用广义随机Petri网(GSPN)对目前提出的几种协议分布式测试框架构造了性能模型，进行了性能比较和分析。为了解决状态空间爆炸的问题，提出了一种同步变迁实施速率等价法(STER)，这种方法能够对具有同步变迁的随机Petri网模型分解求解。     

基于3G的C/S模式宽带振动测试系统研究

复杂结构的振动信号分析算法要满足实时在线测量需要研究分布式计算方法,该系统突破传统动态测试与分析系统结构,研究一种基于3G的客户/服务器方式的振动测试分析系统,研制基于24位分辨率、109dB动态范围测试终端负责信号的本地测试与分析;研究一种位于远程服务器的全频带算法实现频率信号的自动识别,系统前、后台的任务通过自定义的3G用户协议将多种数据综合成流媒体方式进行实时交换,给出测试的结果表明系统方案可行,对构成分布系统具有参考价值。     

大话呼测试模拟器开发研究

大话呼测试是在对测试网元功能测试成功结束后，对测试网元进行压力测试的一种测试方法。它通过模拟网络中某个或多个功能实体与真实测试网元的交互，在一段时间内对测试网元同时发起大量的业务处理要求，以检测测试网元在一定负载情况下的性能表现，是对测试网元性能最有效的检测方式之一。以HammerST为例，介绍了大话呼测试模拟器开发的一般过程和运行原理以及需要注意的问题，以方便大话呼测试的开发与进行。     

北斗三号卫星导航测试系统调研分析

本文通过对国内外北斗三号卫星导航测试系统生产厂家的调研分析，介绍了该系统的组成和功能特性；对北斗三号信号模拟器性能参数进行比对分析，指出国内主要几家生产的北斗三号卫星导航测试系统中存在的优点及不足，并提出建议。     

隧道协议的测试研究和实践

详细论述了隧道协议的一致性和互操作性测试的研究与实践。基于协议的测试需求分析，选择并实现了穿越测试法作为隧道协议的一致性测试方法。在实践过程中通过增加测试描述和扩充参考实现的功能，不仅实现了测试过程中对被测系统的自动配置，而且增强了测试例的可读性。对于隧道协议的互操作性测试，尝试提出一种基于并发TTCN操作语义的互操作性测试框架。     

无线电战术接入网的构建和测试

利用现有短波/微波电台或其他通信设备的数据传输能力,研制构建无线电战术互联网所需的互联网控制器和战术多网网关,从而使各类无线终端组成无中心的自组织网络,并通过TCP/IP协议与外部网络互连互通。采用Vx Works系统作为开发平台,经过系统裁剪和软件编码,将软硬件嵌入到网络核心设备中,运用无线仿真器进行辅助开发和性能测试。室内仿真和野外试验表明:组建的无线电战术接入网能够实现网络异构、路由自动选择等功能;在3~4节点的任意拓扑环境下,网络时延不超过30 s,并成功地接入有线网,能较好地提供各项数据传输业务。     

基于Ad hoc无线网络的AODV路由协议仿真

利用以Ubuntu为平台的NS2网络仿真器,对AODV路由协议进行仿真.通过分析不同仿真场景的仿真数据,绘制出相应的仿真结果对比图,并对AODV路由协议进行了性能分析.仿真结果表明,在数据流不断增加的情况下,网络平均吞吐量、归一化路由开销以及端到端平均时延等性能指标会相应下降,得出了AODV路由协议适合于中小规模且发包率不高的网络场合的结论.     

Determination of the out-of-plane tensile strength using four-point bending tests on laminated L-angle specimens with different stacking sequences and total thicknesses

Laminated composite materials are increasingly used for the design of aircraft primary structures subjected to complex 3D loadings. The delamination observed in curved parts ensuring the junction between the different perpendicular panels is one of the most critical failure mechanisms. The present article proposes a complete protocol to identify the out-of-plane tensile strength of specimens composed of unidirectional plies. Firstly, a method to design a four-point bending (4 PB) test on L-angle specimens has been proposed. Secondly, a test campaign on T700GC/M21 laminated L-angle specimens has been performed at ONERA. Thirdly, the analysis of these tests with different methods has been performed to demonstrate that such a test is relevant to determine the material out-of-plane tensile strength, which seems to be independent of the stacking sequence and of the total thickness of the specimen, thus allowing the use of this strength in a 3D failure criterion. Finally, the different advantages and drawbacks of 4 PB tests performed on curved beams are discussed.     

直升机结构响应主动控制飞行试验

为验证结构响应主动控制方法在直升机振动控制中的有效性,以某轻型直升机为验证机,基于具有在线识别功能的时域自适应控制算法,进行了直升机结构响应主动控制飞行试验研究。给出了飞行试验方法、试验系统组成、试验内容及其过程。通过对飞行试验数据的处理分析,对减振效果进行了评估。试飞结果表明:ACSR(Active Control of Structure Response)系统对各测点的垂向振动均有减振效果,各速度状态下的全机垂向减振效率在30%～66%之间,巡航速度状态下具有最佳的减振效率;此外,各测点的侧向振动水平也有一定程度的减小。     

Computation analysis of interlaminar fracture of laminated composites

The interlaminar fracture behavior of laminated composites has been investigated. Contact and friction along the crack surfaces is taken into account in the finite element modeling of the delamination crack growth. Mode I, mode II and mixed mode loading conditions at the crack tip have been analyzed. For the cracks with contact and friction along the crack surfaces the virtual crack closure integral method is used in order to calculate separated energy release rates. Computational modeling and analysis of cross-ply laminates in three-point bending has been performed. Contact elements were used in order to prevent the material interpenetration along the crack surfaces. Comparison of the results obtained with and without using contact elements has been carried out and significant differences between the correlated values of the energy release rates have been found. The influence of the coefficient of friction on the energy release rates was found to be significant for short delamination crack lengths but insignificant for long cracks. Numerical analyses of experimental data obtained for unidirectionally reinforced glass fiber composites by double cantilever beam tests and by notched flexure tests have been carried out. For the double cantilever beam test geometric linear and nonlinear finite element analyses have been performed and critical energy release rates were calculated. For the end notched flexure test the contact problem has been solved taking into account that adjacent to the support contact and friction will occur. For the double cantilever beam test the critical energy release rates obtained by linear and nonlinear finite element solution has been compared with those from four different analytical data reduction methods (the area method, the Berry method, the modified beam analysis, the compliance method). For the end notched flexure test the critical energy release rates, calculated by the finite element analysis and taking into account contact and friction along the crack surfaces, have been compared with those obtained by conventional beam analysis. This revised version was published online in July 2006 with corrections to the Cover Date.     

一种新型水下移动自组织网路由算法

目前针对移动自组织网提出的路由协议普遍存在路由发现和路由维护效率低的问题,在研究按需距离矢量(AODV)路由算法的基础上,提出了一种水下多路径选择按需距离向量算法(MAODV)。该算法采用多节点路由切换机制,在一条链路失效后不必重新启动路由发现过程,而选用备用节点构成新的链路,继续进行数据包的传输,大大节省了信息资源和带宽。计算机统计仿真表明,该MAODV方法的性能在端到端通信的平均时间延迟和数据包接收率上均优于(AODV)。有效地解决了路由协议中路由发现和路由维护效率低的问题。     

超声测流装置的实验室测试与优化

为提高大口径管道流量在线校准的准确度,建立了一套多声道超声测流装置,对其现场探头定位安装及几何测量方法进行了优化,并在研究流量计算模型的基础上进行了不同探头插入状态的实验室测试。在DN400的管道上安装交叉4声道超声探头,测试了3种探头插入状态,通过分析流量测量误差来得到最优化方案。实验表明,探头插入状态显著影响装置流量测量误差,随着插入深度的增加流量测量结果逐渐增大,但即使全突状态流量依然偏小;3种状态中全缩线性较好,经过系数修正后,全缩状态下超声测流装置计量准确性最高,达到0.2级;超声测流装置经过实验室测试与优化,可以满足1.0级大口径管道流量在线校准的要求。     

Built-in online and offline test of airborne digital systems

This paper studies the effects of both online and offline test during flight critical missions where safety is a major issue. The online test, in this context, is a test performed on a digital airborne system during some specified windows in time while it is still performing its intended task. An offline test is a test that is performed on the digital system once it is taken offline because of a suspected failure. Both the online and the offline tests are performed during flight. The difference between the two is that the offline test can be made more effective than an online test due to the longer amount of time available for testing. Moreover, the offline test may be designed to have diagnosis and repair capability built in. Upon successful repair, the faulty processor may be reconfigured back into the system. Even though both tests are important, we show that the online test is more important than the offline test in enhancing the mission reliability. This is a counter-intuitive result since system repairs are conducted offline.     

区分服务的无线传感器网络路由协议

在优先级多路径路由协议PRIMAR（PRIoritize MultipAth Routing）的基础上,提出了NRE-PRI—MAR协议：以邻居节点剩余能量（NRE）作为衡量路径优先级大小的依据,通过建立节点的二级路由表来决定下一跳转发节点．仿真实验表明,该协议有效地提高了网络的生存期,实现了区分服务．