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基于改进小波阈值函数的雷达信号去噪.doc

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基于改进小波阈值函数的雷达信号去噪.doc

专业文档,值得下载专业文档,值得珍藏201107题录英译集基于改进小波阈值函数的雷达信号去噪赵松,江汉红,张朝亮,柯泽贤(海军工程大学电气与信息工程学院,武汉430033)摘要为去除雷达信号混杂的高斯白噪声,对小波阈值去噪法进行研究。通过分析软硬阈值函数和几种改进阈值函数的特点,提出了改进连续阈值函数和折衷阈值函数,并选取优化阈值进行去噪仿真。仿真结果表明新阈值函数连续性好、便于调节,克服了硬阈值法不连续和软阈值法具有偏差的缺点。方法2效果最佳,有效提高了输出信噪比,对于雷达信号处理具有一定的应用价值。关键词小波变换;阈值函数;雷达信号RADARSIGNALDENOISINGBASEDONIMPROVEDWAVELETTHRESHOLDINGFUNCTIONSZHAOSONG,JIANGHANHONG,ZHANGCHAOLIANG,KEZEXIANCOLLEGEOFELECTRICALINFORMATIONENGINEERING,NAVALUNIVERSITYOFENGINEERING,WUHAN430033,CHINAABSTRACTINORDERTODISCARDTHEGAUSSIANWHITENOISEMIXEDINRADARSIGNAL,RESEARCHEDCONVENTIONALWAVELETTHRESHOLDDENOISINGMETHODBYANLYSINGTHECHARACTEROFSOFTANDHARDTHRESHOLDINGFUNCTIONSANDSOMEIMPROVEDTHRESHOLDINGFUNCTIONS,INTRODUCESTWOOPTIMIZEDFUNCTIONSIMPROVEDCONTINUOUSTHRESHOLDINGFUNCTIONANDECLECTICTHRESHOLDINGFUNCTIONITALSOMAKESASIMULATIONWITHOPTIMIZEDTHRESHOLDTHESIMULATIONRESULTSSHOWTHATTHENEWTHRESHOLDINGFUNCTIONSABOVEARECONTINUOUSANDEASYTOADJUST,WHICHOVERCOMETHESHORTCOMINGSOFTHEINCONTINUOUSHARDTHRESHOLDINGFUNCTIONANDTHESOFTTHRESHOLDINGFUNCTIONWITHUNVARYINGWARPTHESECONDMETHODPERFORMSBETTER,WHICHENHANCESTHESIGNALTONOISEOFOUTPUTSIGNALEFFECTUALLYTHEWORKHASANIMPORTANTAPPLIEDVALUEFORRADARSIGNALPROCESSINGKEYWORDSWAVELETTRANSFORM;THRESHOLDINGFUNCTION;RADARSIGNAL巡航导弹突破要地防空群多层防线的概率模型孙学锋1,赵彦辉1,于天顺21海军航空工程学院指挥系,山东烟台264001;2中国人民解放军92840部队,山东胶南266400摘要为解决如何计算巡航导弹的突防概率问题,建立了巡航导弹的突防概率模型。将巡航导弹的突防过程看作是在一定时间内时间空间和状态空间都离散的马尔可夫链,运用一步转移概率矩阵,计算出巡航导弹突破每一层防线后剩余情况的概率,并结合实际算例进行分析。结果表明该模型可降低巡航导弹的突防概率,提高要地防空群的拦截概率,对提高要地安全性具有重要意义。关键词要地防空群;巡航导弹;马尔可夫链;突防概率模型PROBABILISTICMODELOFCRUISEMISSILEBREAKINGTHROUGHMULTIPLAYERDEFENSEOFAIRDEFENSEGROUPFORSTRATEGICPOINTSSUNXUEFENG1,ZHAOYANHUI1,YUTIANSHUN21DEPTOFCOMMAND,NAVALAERONAUTICALASTRONAUTICALUNIVERSITY,YANTAI264001,CHINA;2NO92840UNITOFPLA,JIAONAN266400,CHINAABSTRACTINORDERTOSOLVETHEPROBLEMOFHOWTOCALCULATETHEPENETRATIONPROBABILITYOFCRUISEMISSILE,THEPENETRATIONPROBABILITYMODELOFCRUISEMISSILEISESTABLISHEDTHEPENETRATIONPROCESSOFCRUISEMISSILEISCONSIDEREDASMARKOVCHAINWHOSETIMESPACEANDSTATESPACEAREBOTHDISPERSEDINACERTAINPERIODOFTIMETHENITISUSEDONESTEPTRANSFERPROBABILITYMATRIXTOCALCULATETHEREMAININGPROBABILITYOFCRUISEMISSILESWHENTHEYBREAKINGTHROUGHEACHDEFENSEANDFINALLYTHEMODELISVALIDATEDTHROUGHANACTUALEXAMPLETHERESULTSSHOWTHATTHEMODELCANREDUCEPENETRATIONPROBABILITYOFTHECRUISEMISSILEANDIMPROVEINTERCEPTIONPROBABILITYOFTHEAIRDEFENSEGROUPFORSTRATEGICPOINTSITISSIGNIFICANTFORIMPROVINGTHESECURITYOFSTRATEGICPOINTSKEYWORDSAIRDEFENSEGROUPFORSTRATEGICPOINTS;CRUISEMISSILE;MARKOVCHAIN;PENETRATIONPROBABILITYMODEL钛合金轻质枪管热结构耦合分析翟光涛,李引中国兵器工业第二〇八研究所一室,北京102202摘要为分析高温高压火药气体对钛合金枪管热性能的影响,以某型小口径钛合金轻质枪管为研究对象,专业文档,值得下载专业文档,值得珍藏建立基于ANSYS平台的枪管热结构耦合分析模型。采用直接耦合方法,利用ANSYS参数化设计语言APDL编程计算枪管在高频动态热脉冲和动态压力循环作用下的温度场和瞬态应力响应,并对计算结果进行实验验证。研究结果表明热脉冲和压力脉冲的耦合作用显著;钛合金的材料性能能满足枪管的设计要求。关键词钛合金轻质枪管;直接耦合;有限元;瞬态应力THERMALSTRUCTURECOUPLINGANALYSISOFTITANIUMALLOYLIGHTWEIGHTGUNBARRELZHAIGUANGTAO,LIYINNO1STAFFROOM,NO208RESEARCHINSTITUTEOFCHINAORDNANCEINDUSTRIES,BEIJING102202,CHINAABSTRACTINORDERTOSTUDYTHEINFLUENCEOFTHEPOWERGASWITHHIGHTEMPERATUREANDHIGHPRESSUREONTHETITANIUMALLOYLIGHTWEIGHTGUNBARREL,TAKINGCERTAINTYPESMALLCALIBERTITANIUMALLOYLIGHTWEIGHTGUNBARRELASSTUDIESOBJECT,ATHERMALSTRUCTURECOUPLINGMODELOFGUNBARRELWASESTABLISHEDBASEDONANSYSPLATFORMTHEDIRECTCOUPLINGANALYSISISEMPLOYEDANDTHEPROGRAMWASWRITTENBASEDONANSYSPARAMETERDESIGNLANGUAGETEMPERATUREFIELDANDTRANSIENTSTRESSRESPONSEOFTHISGUNBARRELWASCALCULATEDUNDERTHECYCLICACTIONOFHIGHFREQUENCYDYNAMICTHERMALPULSEANDDYNAMICPRESSUREPULSEANDASERIESOFEXPERIMENTSWERECARRIEDOUTTOTESTTHESIMULATIONRESULTSTHISSTUDYSHOWSTHATTHECOUPLINGEFFECTOFTHERMALPULSEANDPRESSUREPULSEAREVERYOBVIOUSANDMATERIALPROPERTYOFTITANIUMALLOYMEETSTHEREQUIREMENTOFTHEDESIGNOFGUNBARRELANDTHERESEARCHRESULTSHAVEIMPORTANTSIGNIFICANCEFORTHEDESIGNANDOPTIMIZATIONOFTITANIUMALLOYGUNBARRELKEYWORDSTITANIUMALLOYLIGHTWEIGHTGUNBARREL;DIRECTCOUPLING;FINITEELEMENT;TRANSIENTSTRESS武器装备体系结构项目视图产品设计及开发张晓雪,廖良才,杨克巍国防科学技术大学信息系统与管理学院,长沙410072摘要针对武器装备体系结构描述在项目顶层设计方面存在的不足,结合国内外研究现状,设计和开发武器装备体系结构项目视图产品。主要描述体系中的项目、项目之间的关系、项目演化过程以及项目如何满足体系能力需求,并结合机动防御作战体系结构进行项目视图的实例展示。该研究对体系建设规划、采办管理等领域具有一定的理论和现实指导意义。关键词武器装备体系结构;项目视图;产品设计DESIGNANDDEVELOPMENTOFWEAPONSEQUIPMENTSYSTEMARCHITECTUREPROJECTVIEWPOINTSPRODUCTSZHANGXIAOXUE,LIAOLIANGCAI,YANGKEWEISCHOOLOFINFORMATIONSYSTEMMANAGEMENT,NATIONALUNIVERSITYOFDEFENSETECNOLOGY,CHANGSHA410072,CHINAABSTRACTAIMINGATTHESHORTAGEOFWEAPONSEQUIPMENTSYSTEMARCHITECTUREDESCRIBEINPROJECTSTOPDESIGN,INTEGRATINGSTUDYSTATUSBOTHINCOUNTRYANDABROAD,DESIGNANDDEVELOPARCHITECTUREPROJECTVIEWPOINTS,WHICHDESCRIBESTHEPROJECTSINARCHITECTURE,THERELATIONSHIPSBETWEENTHEM,THEEVOLVEMENTPROCESSANDHOWPROJECTSSATISFYSYSTEMCAPABILITYDEMANDS,ANDCOMBINEMANEUVERRECOVERYOPERATIONSYSTEMARCHITECTUREASEXAMPLETODESCRIBERELEVANTPROJECTVIEWPOINTSPRODUCTSPROJECTVIEWPOINTSHAVEGREATSIGNIFICANCEINMANYFIELDSSUCHASCONSTRUCTINGSYSTEMPROGRAMMING,ACQUISITIONMANAGEMENTKEYWORDSWEAPONSEQUIPMENTSYSTEMARCHITECTURE;PROJECTVIEWPOINTS;PRODUCTDESIGN舰艇编队航材快速补给的系统动力学模型岳奎志1,韩维1,宋岩1,陈伟2,史建国11海军航空工程学院7系,山东烟台264001;2中国人民解放军92514部队9分队,山东烟台264000摘要为解决对大型水面舰艇编队所需的航材的供给不足问题,建立带有自动调节系统的舰艇编队航材快速补给趋势的预测模型,对舰艇编队航材快速补给进行研究。采用系统动力学方法,构建影响舰载机分遣队快速补给效率的各元素因果回路图与存量流量图及预测模型,并以系统动力学软件VENSIMPLE59为平台进行建模仿真。运行结果表明该模型在扰动条件下能进行航材快速补给趋势的预测,可为舰载运输机分遣队快速补给方案的制定提供理论依据。关键词航材补给;舰载运输机;系统动力学;预测SYSTEMDYNAMICSMODELONRAPIDSUPPLYOFSPAREPARTSINCARRIERFORMATIONYUEKUIZHI1,HANWEI1,SONGYAN1,CHENWEI2,SHIJIANGUO1专业文档,值得下载专业文档,值得珍藏1NO7DEPARTMENT,NAVALAERONAUTICALASTRONAUTICALUNIVERSITY,YANTAI264001,CHINA;2NO9UNIT,NO92514ARMYOFPLA,YANTAI264000,CHINAABSTRACTESTABLISHTHEAUTOMATICREGULATORYSYSTEMATICFORECASTINGMODELABOUTRAPIDSUPPLYOFSPAREPARTSTRENDINCARRIERFORMATIONTOSOLVETHESHORTAGEOFSPAREPARTSINTHEMAJORSURFACECARRIERFORMATIONSTUDIEDTHERAPIDSUPPLYOFSPAREPARTSFORCARRIERFORMATIONWITHTHEMETHODOFSYSTEMDYNAMICS,THISARTICLEBUILTCAUSALLOOPDIAGRAMSANDSTOCKANDFLOWDIAGRAMSABOUTEVERYELEMENTOFIMPACTINGTHERAPIDSUPPLYRATEOFDETACHMENTINCARRIERPLANEANDSIMULATEDONTHEBASISOFSYSTEMDYNAMICSSOFTWAREOFVENSIMPLE59THESIMULATIONRESULTSSHOWTHATTHISMODELCANPREDICTTHERAPIDSUPPLYTRENDOFSPAREPARTSUNDERCONDITIONOFPERTURBATION,ANDPROVIDETHETHEORETICALEVIDENCEFORSCHEDULINGTHERAPIDSUPPLYMETHODFROMDETACHMENTINCARRIERAIRCRAFTKEYWORDSSPAREPARTSSUPPLY;CARRIERAIRCRAFT;SYSTEMDYNAMICS;PREDICTELECTREI多属性评估方法在防空威胁评估中的应用刘新科1,王威2,谭乐祖21西北工业大学,西安710072;2海军航空工程学院,山东烟台264001摘要针对传统的多属性评估方法的局限性,将ELECTREI多属性评估方法应用到防空威胁评估中。在介绍ELECTREI方法关键思路与分析步骤的基础上,结合防空威胁评估的特性,建立了基于ELECTREI多属性评估方法的目标威胁评估模型。算例分析结果验证了该方法的有效性与合理性。关键词威胁评估;ELECTREI;多属性评估APPLICATIONOFELECTREIMULTIATTRIBUTEBLOCKASSESSMENTINAIRDEFENCETHREATEVALUATIONLIUXINKE1,WANGWEI2,TANLEZU21NORTHWESTERNPOLYTECHNICALUNIVERSITY,XI’AN710072,CHINA;2NAVALAERONAUTICALASTRONAUTICALUNIVERSITY,YANTAI264001,CHINAABSTRACTAIMINGATTRADITIONALLIMITATIONOFMULTIATTRIBUTEBLOCKASSESSMENT,ELECTREIMULTIATTRIBUTEBLOCKASSESSMENTAPPLYTOAIRDEFENCETHREATEVALUATIONONTHEBASISOFINTRODUCEELECTREIMETHODKEYIDEAANDANALYSISSTEP,COMBININGTHECHARACTERISTICOFAIRDEFENCETHREATEVALUATION,ATHREATEVALUATIONMODELBASEDONELECTREIMULTIATTRIBUTEBLOCKASSESSMENTISESTABLISHEDTHEEXAMPLEANALYSISPROVESTHEFEASIBILITYANDPRACTICABILITYOFTHEMETHODKEYWORDSTHREATEVALUATION;ELECTREI;MULTIATTRIBUTEBLOCKASSESSMENT重型冲击桥仿真模拟训练系统周波,裴超毅,牛赛总装工程兵科研2所2室,北京100093摘要为帮助部队尽快掌握冲击桥技术性能和提高训练效率,设计了重型冲击桥模拟训练系统。模拟训练系统由操作台、主操控盒、仿真计算机、作业显示终端、数据采集与通讯、视景仿真训练软件等组成。通过三维建摸、软件驱动,可在屏幕上多视角、立体显示冲击桥架设撤收的每个动作过程和桥跨、架设机构的结构细节,在作业显示终端上显示冲击桥架设撤收进度和动作状态。试验结果证明冲击桥模拟训练系统可以减少装备的损耗,延长使用寿命,降低训练风险,节省训练经费和提高训练效率。关键词冲击桥;仿真;模拟训练SIMULATIONTRAININGSYSTEMOFHEAVYASSAULTBRIDGEZHOUBO,PEICHAOYI,NIUSAINO2STAFFROOM,NO2SCIENTIFICRESEARCHINSTITUTEOFCORPSOFENGINEERSOFDEPARTMENTOFGENERALEQUIPMENT,BEIJING100093,CHINAABSTRACTINORDERTOMASTERTHETECHNICALPERFORMANCESANDTOPROMOTETRAININGEFFICIENCYFORTROOPS,ASIMULATIONTRAININGSYSTEMOFHEAVYASSAULTBRIDGEWASDESIGNEDTHISSYSTEMCONSISTSOFTHEOPERATIONPLATFORM,THEMAINOPERATIONBOX,THESIMULATIONCOMPUTER,THEWORKDISPLAYTERMINAL,THEDATACOLLECTIONANDCOMMUNICATIONSYSTEM,THEVISUALEMULATIONTRAININGSOFTWARE,ANDSOONTHESYSTEMISUSEDTODISPLAYTHEPROCESSOFLAUNCHINGANDRETRIEVINGANDTODISPLAYTHEDETAILSTRUCTURESOFTHESPANANDTHELAUNCHSYSTEMOFTHEASSAULTBRIDGEBYTHEWAYOFTHREEDIMENSIONALMODELINGANDSOFTWAREDRIVINGWECANSEETHEABOVETHEPROCESSESINALLDIMENSIONSONTHESCREENWEALSOCANUNDERSTANDTHERETRIEVINGPROGRESSESANDTHEWORKINGSTATESONTHEWORKDISPLAYTERMINALASARESULTOFTESTING,ITWASPROVEDTHATTHISSYSTEMCANREDUCEEQUIPLOSS,PROLONGUSINGLIFE,REDUCETRAININGRISK,SAVETRAININGFUNDSANDPROMOTETRAININGEFFICIENCYKEYWORDSASSAULTBRIDGE;EMULATION;SIMULATIONTRAINING专业文档,值得下载专业文档,值得珍藏我国烟花爆竹生产工艺装备现状及发展趋势吴斌,周丽娟,李威中国兵器工业第五八研究所工业自动化工程技术部,四川绵阳621000摘要概述国内烟花爆竹行业生产现状,针对该行业仍处于手工作业向机械化生产过渡的生产模式,分析现行工艺装备存在的问题,提出安全可靠、高效高质、多工位自动化的发展方向,以及需要重点解决的制约性技术难题。该研究可为下一步突破各项关键技术提供参考。关键词烟花爆竹;工艺装备;现状;发展趋势STATUSANDFUTUREDEVELOPMENTFORTECHNICSANDEQUIPMENTOFCHINA’SFIREWORKSANDCRACKERSWUBIN,ZHOULIJUAN,LIWEIDEPTOFINDUSTRIALAUTOMATIONENGINEERINGTECHNOLOGY,NO58RESEARCHINSTITUTEOFCHINAORDNANCEINDUSTRIES,MIANYANG621000,CHINAABSTRACTINTRODUCESTATUSANDFUTUREDEVELOPMENTOFCHINA’SFIREWORKSANDCRACKERSINDUSTRIESINORDERTOACCELERATETHEINDUSTRYTRANSITIONFROMHANDWORKTOMECHANISATION,ANALYZEEXISTINGPROBLEMSOFPRESENTTECHNICSANDEQUIPMENTANDPUTFORWARDADEVELOPMENTALDIRECTIONWITHSECURITYANDRELIABILITY,HIGHEFFICIENCYANDHIGHQUALITY,ASWELLASAUTOMATICANDMULTIPLESTATIONSITALSOINTRODUCESCONDITIONALANDTECHNOLOGICALQUESTIONSTHATNEEDTOBENECESSARILYSOLVEDTHEGIVENRESEARCHCOULDMAKEREFERENCETONEXTRELATEDCRITICALTECHNOLOGIESKEYWORDSFIREWORKSANDCRACKERS;TECHNICSANDEQUIPMENT;STATUS;FUTUREDEVELOPMENT轻武器杀伤效能评估理论与计算陈强华,王永娟南京理工大学机械工程学院,南京210094摘要为了有效评估轻武器杀伤效能,对轻武器杀伤效能进行理论评估与计算。以终点弹道理论和创伤弹道学理论为依据,建立球型破片和枪弹在明胶中的运动模型,采用龙格库塔法对运动模型进行编程,计算出杀伤元的侵彻速度与侵彻深度随时间的变化曲线,从而预测出杀伤元在明胶中传递的能量,再将其应用于几种常用的基于能量传递的轻武器杀伤效能评估模型中,即可快速评价杀伤元的杀伤效能。实例计算结果证明该方法简单、方便,可为轻武器研究、设计、论证提供参考。关键词球形破片;枪弹;能量传递;运动模型;杀伤效能EVALUATIONTHEORYANDCALCULATIONOFKILLEFFICIENCYFORSMALLARMSCHENQIANGHUA,WANGYONGJUANSCHOOLOFMECHANICALENGINEERING,NANJINGUNIVERSITYOFSCIENCETECHNOLOGY,NANJING210094,CHINAABSTRACTINORDERTOEVALUATEKILLEFFICIENCYFORSMALLARMSEFFECTIVELY,KILLEFFICIENCYFORSMALLARMSWASTHEORETICALLYEVALUATEDANDCALCULATEDTAKETHETERMINALBALLISTICSTHEORYANDWOUNDBALLISTIC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