固体火箭发动机冷增压试验系统的设计与应用

针对固体火箭发动机药柱点火瞬态过程应变难以测量的工程难题,研制了固体火箭发动机冷增压试验系统.该系统利用高压气体对药柱内腔进行加压,模拟发动机点火增压过程,实现了药柱内表面应变的实时测量.利用该系统对某型号固体火箭发动机进行了冷增压试验,并将试验结果与数值仿真结果进行了对比,二者相对误差在8％以内.该试验系统操作方便,...     

液体火箭发动机液流试验系统测量过程控制研究

介绍了液流试验系统测量过程控制。从日常液流试验系统测量过程验证及控制方法入手,详细介绍了各种测量验证及控制方法的应用场合及其优缺点。最后给出了目前开展测量控制工作所存在的问题及今后的发展方向。     

An improved multiple model GM-PHD filter for maneuvering target tracking

In this paper, an improved implementation of multiple model Gaussian mixture probability hypothesis density (MM-GM-PHD) filter is proposed. For maneuvering target tracking, based on joint distribution, the existing MM-GM-PHD filter is relatively complex. To simplify the filter, model conditioned distribution and model probability are used in the improved MM-GM-PHD filter. In the algorithm, every Gaussian components describing existing, birth and spawned targets are estimated by multiple model method. The final results of the Gaussian components are the fusion of multiple model estimations. The algorithm does not need to compute the joint PHD distribution and has a simpler computation procedure. Compared with single model GM-PHD, the algorithm gives more accurate estimation on the number and state of the targets. Compared with the existing MM-GM-PHD algorithm, it saves computation time by more than 30%. Moreover, it also outperforms the interacting multiple model joint probabilistic data association (IMMJPDA) filter in a relatively dense clutter environment.     

大型整星无磁转台研制方案探讨

文章介绍了气浮、静压、水压、大滚子轴承式、滚轮式等5种转台方案,同时阐述了在设备研制中,优化设计、技术更新的重要性。     

ISC3大气扩散模型在伊敏矿区的验证与应用

ISC3是美国环保局提出的一个适用于分析和测定固定工业源泄放的扩散模型,其是否能在我国伊敏矿区应用,是需要验证的.为此,利用2005年伊敏地区的大气环境监测数据和气象数据以及ISC3模式系统建立并验证了空气扩散模型.验证结果表明,颗粒物的监测日均值和模拟日均值的相关性比SO2要好.     

应用TESTWORK3.02软件测试不锈钢带的力学性能

介绍了用ＴＥＳＴＷＯＲＫ３．０２测试软件对不锈钢带力学性能的测试过程。从而获得了不锈钢带的弹性模量、抗拉强度、非比例伸长应力、断后伸长率等指标。     

校准箱的基本结构和应用

简要地介绍了CARIA校准箱的基本构成和应用,并给出了该校准箱和荷兰NLR校准箱的一些比较。在这个校准箱中、推力和流量的测量精确度可分别达到0.2％和0.3％。     

A study of people's sketching habits in GIS

Sketching is traditionally associated withdoodling simple strokes on a piece of paper.Only few professionals outside of design andthe fine arts have recognized the expressivepower of this intuitive modality. However,sketching seems particularly well suited tocapture objects and situations in a spatialenvironment, such as geographic space. To learnmore about the techniques and strategies peopleuse when sketching, a survey of sketching wasconducted. The study showed that paper andpencil sketches contain mostly simple andabstract objects that are composed of only fewstrokes. The spatial configuration of a sceneis primarily expressed through the topologicalordering of objects relative to each other.Metric relationships are used to refine spatialconfigurations. These and other findingssuggest that sketching is an appropriatemodality to interact with a computer where onewants to describe and capture objectconfigurations in a spatial environment, suchas a geographic information system (GIS).     

XP过程对软件缺陷影响分析

XP方法测试驱动和多版本发布的实践,决定了软件产品集成测试也是一个增量迭代的过程。用户使用测试对提高产品的可靠性有重要作用。本文探讨XP测试过程对软件缺陷的影响及其缺陷改正效率的度量。     

机载火控系统远程测试装置的设计与实现

介绍了一种用VXI总线技术组建的机载火控系统远程测试装置 ,以及该装置的硬件配置和在LabWindows/CVI环境下的软件模块化设计