面向LRM体系的测试性验证指标体系研究

针对现有测试性验证试验指标体系与外场可更换模块体系下装备的测试性验证需求不够匹配的问题,提出了面向LRM的测试性验证试验指标体系。首先,针对外场可更换模块体系引起的装备两级维修保障体制变革,分析了该体系下的测试性验证需求;然后从LRM体系装备测试性设计特点和两级维修保障体制的任务目标出发,构建了测试性验证指标评估体系;最后,建立了Topsis优化的基于该指标体系的模糊层次评估模型,实现了测试性综合评估。实例分析表明,该指标体系简便且有效,为面向LRM体系的装备测试性验证提供了思路。     

武器装备维修性验证试验方法研究

近年来,我军开始推行武器装备三级维修保障体系向两级维修保障体系转变的维修体制改革。武器装备的维修性是实施装备两级维修保障体制改革的关键,在生产定型阶段对其进行维修性验证试验很有必要。为了进一步完善维修性验证试验方法,以适应维修体制改革的需求,分别对开展武器装备维修性验证试验工作的时机、内容、方法与流程进行了概述;在分析了当前维修性验证试验方法特点的基础上,重点对维修性验证试验工作中的试验方法的选取、样本量确定及样本分配、故障模拟及注入三个关键技术及研究现状进行了总结与归纳;通过对试验关键技术的研究,分析了当前开展维修性验证试验工作存在的问题,对进一步开展维修性验证试验方法研究的内容及方向进行了展望。     

基于故障注入的雷达装备测试性验证试验方法

为将测试性验证工作充分应用于雷达装备中,分析现有测试性验证工作的流程以及方法;现在的测试性验证工作一般采用三阶段评定法:测试性设计核查、试验验证和使用评价,这些方法都是在相应的阶段进行的,得到本阶段测试性验证的结果;对雷达装备采用故障注入的方法进行测试性验证试验,进行故障检测和数据收集处理得出相应的测试性指标参数,用来评定雷达装备当前的测试性水平是否合格并给出接收或者拒收的结论。     

装备保障体系建模与仿真关键技术研究

为解决装甲装备体系保障能力生成的关键技术难题,针对现有需求和装备保障体系仿真中心建设的实际情况,以装甲机械化部队为主要研究对象,论文主要研究内容包括：描述了装备保障体系概念,构建了装备保障体系结构框架;总结了适合装备保障体系的建模与仿真方法,采用分层建模、基于多Agent和基于UML的体系建模方法,建立了装备保障体系模型,并对模型进行了仿真;借鉴霍尔三维结构,建立了装备保障体系评估对象维、评估指标维和评估目标维,进行装备保障体系效能评估。通过研究,初步明确了装备保障体系的内涵,明确了适合装备保障体系的建模与仿真方法,具备一定的实用性和可操作性,能够为进一步推进装备保障体制改革、完善综合保障体系、创新保障模式、增强综合保障能力提供有力的理论支撑。     

Φ1米高超声速风洞自主式维修保障系统设计

为了解决Φ1米量级高超声速风洞装备试修矛盾,提高风洞参试效率并拓展风洞技术性能,实现风洞装备管理信息化和过程质量控制精细化,满足国家高超声速武器装备和航天飞行器研制中地面试验的需求,提出了建设Φ1米量级高超声速风洞自主式维修保障系统。文章分析了风洞的设备组成、运行方式、试验任务特点以及风洞装备维修保障的现状,按照“增强的基于状态维修”的装备保障新模式,进行了系统设计架构,明确了硬件系统组成和软件各模块的功能。对风洞装备故障模式分析、基于振动特性分析的诊断和测试技术、基于应变特性分析的诊断和测试技术等关键性问题进行了实验探索与验证。     

基于云测试的自动测试系统体系架构研究

为了解决面临保障任务时,我军现有保障设备对武器装备故障检测周期过长以及测试资源在测试周期中被单个故障装备长时间占用的问题,对基于云测试(Cloud Testing)的自动测试系统(ATS,Automatic Test System)的体系架构进行了研究。以软件可移植性、硬件可互换性和系统互操作性为设计原则,对面向信号测试领域的云测试系统的体系架构进行了分析;在充分研究现有ATS的体系架构及其存在的突出问题的基础上,提出了基于云测试的ATS的软、硬件模型。为构建基于云测试的自动测试系统的开发和相关关键技术的研究提供了以有益的借鉴并打下了坚实的基础。     

基于故障注入的测试性验证试验样本量确定方法

试验样本量的确定是基于故障注入的测试性验证试验中的关键技术之一。样本量的确定是为了解决样本充分性要求与故障不能穷尽注入的限制条件之间的矛盾。目前确定试验样本量的方法包括最小样本量估计法以及按照不同的试验方案所确定的方法。通过对这些方法的优点、缺点以及使用条件进行对比,总结出了样本量确定方法的研究现状以及目前工程上进行基于故障注入的测试性验证试验时的普遍情况,并且从矛盾的两方面展望了进一步研究的发展。     

装备使用期间的测试性评估研究

随着大数据技术在设计领域的应用,装备测试性水平的提高不仅依赖于设计方法,还依赖于大量的、全面的测试性数据。这就要求装备测试性工作应该是贯穿全周期寿命的一个连续过程,不应局限于研制阶段,还应包括使用阶段。对装备使用期间开展测试性评估工作,有利于完善装备的测试性信息,促进装备的测试性提高。在此基础上,本文对装备使用期间的测试性评估进行了研究,给出了评估工作的具体流程和实施方法,对指导工程实践具有一定的意义。     

面向复杂系统的测试性试验验证技术研究

测试性试验验证是指产品在设计、研制、定型阶段,为了确认其测试性指标的量值,分析其测试性设计的正确性、合理性并识别设计缺陷、检测产品是否已经完全实现了测试性设计要求而进行的验证与评估活动。当前,对于设备级试验对象的测试性试验验证技术,已经形成了相关的技术规范,并在某些型号测试性验证工程中已全面使用,然而,产品的测试性设计水平的最终要体现在系统层面上,设备级的试验只能考核设备自身的故障检测和故障隔离能力（即对内场可更换单元（SRU）的检测和隔离能力）,而难以体现出系统级的检测和隔离能力（即对外场可更换单元（LRU）的检测和隔离能力）。系统的检测和隔离能力主要体现在：系统对设备自身检测结果的综合处理与分析能力、系统对设备故障的检测能力以及系统对自身功能的检测能力。因此,为了有效验证系统的测试性设计水平,必须开展系统级的测试性试验。本文在目前测试性试验技术存在的基础上,基于目前测试性试验的基本思路,从测试性试验方案设计及故障注入技术两个方面开展研究,提出了一套面向复杂系统级测试性试验的技术方法。     

测试性试验环境建设探索研究

在装备测试性设计过程中,测试性设计结果对研制总要求的符合性检查或评定 由专业的第三方机构进行,测试性设计试验往往被疏忽。这会造成设计结果评估的不准确,也不利于设计的更改和优化。随着现代飞机复杂度的日益提升,测试性设计的试验验证日益显得迫切。本文通过型号研制保障条件建设,提出装备测试性试验的定位以及试验环境建设的思考,同时给出测试性试验环境建设的的范例,供行业内相关工程参考。     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.