简介：疲劳失败长是为轮船的一个重要问题并且近海结构。在为预言疲劳生命的众多的方法之中，光谱方法作为最可靠被接受。尽管在光谱分析后面的理论是直接的，因为它仔细与象疲劳的申请那样的批评技术细节有关正在装载，分析本身复杂、费时间(由于货物挥动压力和惯性的力量)，压力的抽取，并且压力RAO的计算。这里，四关键装载technicaldetails应用，排水量边界条件，压力RAO的计算，和疲劳压力的抽取彻底地讨论了。为每个方面，分辨率基于有限元素pre被介绍--并且processing以后软件MSC/PATRAN或FEsolverMSC/NASTRAN。决定有效、有效，它能帮助工程师表现光谱精确地并且更快使分析疲劳。

简介：Thispaperaimstoachieveanalysisandexperimentresultsthatrelatetomechanicscapabilityandstructuralparameterofaspecialsaddleshellofrevolution.Theoreticallyspeaking,thesaddleshellofrevolutionconsistsofatoroidalshellandasphericalshell.Theshellssimultaneousequationscanbesolvedwithharmoniousterms.Where,thefundamentalequationscanbesolvedbyasymptoticexponentialperturbationmethod.TheequationsofspecialsolutioncanbesolvedbyHovozhilovsspecialsolution.Thisnewideaisfromastudyofsomeexistingsolutionsofthetoroidalshell.Theresultshavebeenprovedbycomparedwithsomeexperimentalresults.Theexperimentsaimstostudytheeffectcausedbychangeofmaterialparameter,orbychangeofdifferentgeometricdimensionsofthesaddleshell,whichincludethechangeofthickness,thechangeofradiusofshell,andthechangeofribs.Finally,theacceptedproductofthesaddleshellwerereinforcedbyatoroidalribhasbeensubmitted.

简介：Intheconceptualstagethefunctiondesignprocessisrealizedbythecomputeraidedapplication.Aftersurveyingonthefunctionspecificationmethodsandthefunctionmodeling,acomputeraidedfunctiondesignenvironmentisanalyzed.Subsequentlybasedonamodulelibraryandprinciplecatalogue,asolutionfindingprocessasapartofconceptualdesignisproposedforacreativedesign.Inaddition,asearchalgorithmtofindthesolutionofadaptablefunctionstructureisalsodiscussed.Theconceptsproposedinthispapercansupportthesubsequentdesignstages,especiallysimulationforcheckingthefunctionstructuredefects.

简介：Sincecannondrumofagileshell-feedingsystemrotatesfrequentlyandintermittently,itsmotionmustbesteady.Outlineofdrivingcamdeterminesthemotionofcannondrum,soitisnecessarytoselecttheproperoutlineofcam.Throughanalysisofparabolicoutlineandcycloidoutlineofthecams,theoutlinethatcombinesthetwocurvesisobtained.Accordingtothedemandofproduction,thevalueoftheoutlineisrevised,andthenthemethodoffittingcurveisusedtogettheexpressionoftheangleofcamandthedisplacementofthedrivenpart.Throughanalyzingthemotionofthecannondrum,itissuggestedthattheangleofthecamisproportiontothedisplacementofthedrivenpart.Thecamwiththespeciallyderivedoutlinecanmovesteadily.

简介：BythesketchofstructureofMVWG,theworkinglawsofthiskindofgyroscopewereexplained.TotheaidofEuler′sDynamicsEquation,amathematicalmodelofthegyroscopewasconstructed,andthenbythebasicworkinglawsofMVWGthemodelwassimplified.Undertheconditionsofthethreeaxialdirectionrotationsandgeneralrotation,themathematicalmodelwasresolved.Andfinallybythesolutions,theworkinglawsofthegyroscope,theworkingdisparityamongallsortsofgyrationsandtheinfluencesfromthegyrationsintheaxialdirectionswereanalysed.

简介：苗条、扁平的柄是在海洋的容器的轨道录音机的关键部分。然而，在它被用机器制造以后，柄的轴的笔直经常超过标准大小。它的精确不持续很长时间，这也被发现了。在这些问题的彻底的分析以后，假装用机器制造质量的主要原因被识别--并且一个过程修正计划被提出那满足柄的设计要求。生产和实践显示柄的精确为一个长时期和在新措施被采用以后，实质地改进的产品的质量是稳定的，固定海洋的容器的trackrecording的e精确性。

简介：动态僵硬矩阵方法被使用在这篇论文计算壳girder的颤动。这个方法不能仅仅简化计算模型，而且精确地得到高得多的频率和回答。为横向的颤动的一根Timoshenko横梁的动态僵硬矩阵的分析表情在这篇论文被介绍。旋转惯性的所有效果并且砍变丑在明确的表达被考虑。结果与Wittrick威廉算法相结合的动态僵硬矩阵被用来计算自然频率和299,500DWTVLCC的模式形状，然后震动的回答被模式重叠方法解决。计算结果与从另外的近似方法和实验获得的那些相比，并且它显示方法精确、有效。

简介：Threekeyfactorsarediscussed,whichaffectpositioningaccuracyofrange-rangepositioningmodeandhyperbolicpositioningmode.Basedontheerrorellipticaltheory,theexpressionsofpositioningerrorandofpositioninggeometricfactorofrange-rangepositioningmodeandhyperbolicpositioningmodearederived,andthepositioningerrorandtheblindpositioningareaoftwodifferentpositioningmodesareanalyzed.Accordingtotherequirementofnavigationarea,anoptimumpositional

简介：AChebyshevfittingwayforapropelleratlasacrossfourquadrantsisdiscussed.Asanexample,Chebyshevpolynomialfittingresultsanditserroranalysisaregiven.Becauseit’sdifficultgenerallytogetapropelleratlasacrossfourquadrants,awayisusedtoconstructanalternativewithhigheraccuracybasedontheproperties.Asanapplicationexample,analternativeforthepropellerpropertyofaDeepSubmergenceVebicleacrossfourquadrantsisgivenpracticallyandasimulationmodelofthe

简介：Usingtheairplasmaignitiontechnique,physicochemicalprocessofburningcanbeaccelerated;concentrationlimitofretrofiresbothcanbeextended;reliabilityofretrofiresandstabilityofburningcanbeimproved.Inthispaper,usinginternalequivalentheatareainplaceofelectricarethatcreatedOhmheat,theflowfieldsofthermodynamicequilibriumchemistrycon-gealmentandchemistrynon-equilibriumintheplasmageneratorweresimulated.Theinfluencesoftheinletprerotationangleofair,theinlettotalpressureofairandtheairflowcompressionangleofspraynozzleonthetemperatureonthesurfaceofelec-

简介：Presentsthefin-propellertestset-uptosolvetheproblemofrollstabilizationwithshipsinfullspeedrange,withwhich,testswereruninwaterrankforacquisitionofdata,andconcludesfromdataacquiredthatthefin-propellertestset-upproducesmoreliftthansimplefin,andprovideslateralthrustaswell,anditisthereforeaneffectiverollstabilizationdeviceforshipsinfullspeedrange.

简介：SomeconstructcharacteristicsandcomposingmaterialofthenewGyro'srotorareintroduced.Somefactorsresultingindeformationoftherotorsurfaceareanalyzed.Underdifferentloadssuchastheforceofdeflectingcenter,thechangeoftemperature,theforceofpressureandcouplefactors,thedeformationofrotorisanalyzedwiththewaveletfiniteelementsimulationsoftware.Thevectordistributingmapofrotorreformationisgiven.Thedeformationresultingfromthepressureforceofphotonisstudied.Finally,theinfluenceonGyro'sperformancebecauseofanomaloussurfaceofrotorduetodeformationofrotorisresearchedandtheresultisusefultoforecasttheperformanceofthedriftofgyroscope.Thedisturbingmomentresultingfromthedeformationofrotorcanbecompensatedusingthemathematicmethod,andprovidesanimportantreferenceforbothdesignandoptimizationoftherotor.

简介：Commoneffectofwaveandslipofinternalheavyloadwillmakerollingoftheroll-onshipserious.Thisisoneoftheimportantreasonsforoverturnofro-roships.ThemultibodiesSystemwithafloatingbaseiscomposedofro-roshipandslippingheavyload.Thispapertakestherollingangleoftheshipandthetransversedisplacementoftheheavyloadondeskastwofreedoms.Makinguseofanalysisofapparentgravitationandapparentbuoyancy,thewaverollingmomentisderived.Byuseofdynamicmethodofmultibodiessystemwithafloatingbase,dynamicequationsofthesystemareestablished.Takingacertainchannelferryasanexample,asetofnumericalcalculationhavebeencarriedoutforrollingresponseoftheshipanddisplacementresponseoftheslippingheavyloadundercommoneffectofsynchro-slippingheavyloadsandwave.

简介：事故多发路段治理对策陈建华陈琦事故多发路段是指交通事故发生频率较高和相对集中的路段。交通实践中，事故多发路段是客观存在的。因此，治理事故多发路段，无疑是交通事故防治工作的重点，是保障整体道路交通安全形势的关键之举。一、多发路段及其事故的概况和相关特征...

简介：随着铁路主辅分离、多经改制的要求，车站多经即将与主业脱钩。改制后，运输主业轻装上阵，更好的抓好安全生产和运输收入；多经部门则在新的体制下，凸现多经企业做大做强的优势，为铁路运输再立新功。但是，任何改革改制工作，都会遇到一些过去所没有遇到的困难和问题。因此，如何面对多经改制所带来的困难和问题，制定相应的对策和解决办法是当前摆在我们面前的首要问题。

简介：油品虚假盈亏严重影响油品数量管理,分析其产生原因并提出相应对策。

简介：列车脱轨是常见行车惯性事故,与铁路机车工电辆各部门都有一定关系.大部分列车脱轨事故是由许多部门形成的综合因素所引起的.将列车脱轨理论与实际结合起来,提出防止对策初见,建议尽快推广使用沪宁线、京津线"行车安全综合监测系统"中的车辆运行状态地面安全监测系统、货车装载状态监测系统、道岔状态监测系统、轨道动态监测单元、新型轨道检测车等现代化设备,以科技保安全.

简介：在数学教学实践中,深知思维滞呆性危害极大,它在利用概念、判断、推理等思维形式进行分析、综合、比较、抽象、概括等思维活动中,墨守成规,一成不变地认识事物,僵化死板地看待问题,对培养思维灵活性阻力最大,它犹如一潭死水,没一点生机,但它普遍存在于数学教学之中.因此,研究克服思维滞呆性,培养思维灵活性,是数学教师的重要责任.

简介：近年来,由于设备超期服役,线路累计通过总重不断增加,大秦线湖东工务段管内钢轨疲劳伤损日益增多,线上喷焊钢轨折损的现象愈加突出.据统计,仅1999年该段发生重伤钢轨803根,平均每千米重伤达4根以上;发生钢轨折断9起,其中7起是焊补过的钢轨;线上尚存喷焊钢轨528根.钢轨喷焊在一定时期内延长了钢轨的使用寿命,节约了维修成本,但由于未能及时更换,无限期延长使用时间,疲劳加剧,产生核伤,一旦伤损,即会造成钢轨横裂甚至折断,威胁行车安全.因此,喷焊钢轨折损问题,已是当前线路工作亟待解决的主要课题.

简介：文章介绍了舟山旅游业发展现状，从战备定位、管理体制、旅游产品开发、资源整合、旅游人才培养等多方面阐述了舟山旅游的发展对策。