简介：[摘要]呼吸机为人体支持通气与进行呼吸治疗的设备，在进行病人生命体征维系的治疗过程中尤为重要。在日常使用过程中，呼吸机产生的各种故障会直接影响设备使用，通过对故障类型的整理分析，可以更好地了解呼吸机各项故障，有效帮助故障排除。本文介绍了呼吸机常见故障，分享了一例多起故障合并的维修案例，通过故障可能性分析，从气泵、气路检查到管路、流量传感器及电路板维修，一步步找到问题所在，解决该台呼吸机系统故障和潮气量忽大忽小等问题，为该台设备正常使用提供有效的保障。

简介：摘要：目前的在医院医疗设备中，有创呼吸机是医院最基本的急救，生命支持类设备，广泛运用在各个科室中。有创呼吸机的良好运行对医院，尤其是急救科室来说至关重要，有创呼吸机一旦出现问题，对很多病人来说就是生命的代价，所以我们对于有创呼吸机的维修就需要做到及时，高效，保证有创呼吸机的良好运行。

简介：福特的安全实验室以拥有经济而省时的先进的伺服滑车而自豪

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简介：Arobustadaptivepredictorisproposedtosolvethetime-varyinganddelaycontrolproblemofanoverheadcranesystemwithastereo-visionservo.Thepredictorisbasedontheuseofarecurrentneuralnetwork(RNN)withtappeddelays,andisusedtosupplythereal-timesignaloftheswingangle.Therearetwotypesofdiscrete-timecontrollersunderinvestigation,i.e.,theproportional-integral-derivative(PID)controllerandtheslidingcontroller.Firstly,adesignprincipleoftheneuralpredictorisdevelopedtoguaranteetheconvergenceofitsswingangleestimation.Then,animprovedversionoftheparticleswarmoptimizationalgorithm,theparallelparticleswarmoptimization(PPSO)methodisusedtooptimizethecontrolparametersofthesetwotypesofcontrollers.Finally,ahomemadeoverheadcranesystemequippedwiththeKinectsensorforthevisualservoisusedtoverifytheproposedscheme.Experimentalresultsdemonstratetheeffectivenessoftheapproach,whichalsoshowtheparameterconvergenceinthepredictor.

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简介：不明确的磨擦是在计算机数值控制机器影响伺服系统的精确性的一个关键因素。在这份报纸，基于活跃骚乱拒绝控制(ADRC)的原则，一个控制方法被建议，在扩大州的观察员(ESO)和扩大的减少的顺序声明观察员(RESO)被用来估计并且补偿骚乱的地方。作者证明两条途径在理论保证高精确性，并且为参数选择给标准。作者也证明有RESO的ADRC在骚乱评价和追踪的错误两个都与ESO比那更好表现。计算机数值控制上的模拟结果用机器制造我们的控制的有效性和可行性接近的表演。

简介：摘要：呼吸机在生命支持和呼吸治疗方面发挥着至关重要的作用，本文旨在分析Servo呼吸机常见故障，维修及保养维护方面常见问题，以及如何提高科室相关人员日常使用维护管理水平，提高设备开机率，降低呼吸机故障频率，延长整机使用寿命，从而创造良好的社会效益。

简介：伺服马达由于刺激输入电压，负担转矩和环境操作条件的效果拥有一个强烈非线性的性质。导出能够表示它的动力学和不变的特征的一个传统的数学模型因此是相当困难的。神经基于网络的适应控制策略在这篇论文被建议。在这个方法，二个神经网络分别地为系统鉴定(NNI)和控制(NNC)被采用了。然后，使用得通常学习专业化被修改了，由在重量期间作为伺服马达的近似产量拿NNI产量训练得到敏感信息。而且，选择学习的率的规则根据Lyapunov稳定性的分析被给。最后，在一台伺服马达上使用建议控制策略的一个例子被举显示出它的有效性。

简介：Inthispaper,ahybridadaptivecompensationcontrolschemeisproposedtocompensatethefrictionoccurrenceandothernonlineardisturbancefactorsthatexistinthehigh-precisionservosystem.Anadaptivecompensationcontrollerwithadual-observerstructureisdesigned,whiletheLuGredynamicfrictionmodelwithnon-uniformparametricuncertaintiescharacterizesthefrictiontorque.Consideringtheinfluenceoftheperiodicdisturbancetorqueandparametricuncertainties,fuzzysystemsandarobusttermareemployed.Inthisway,thewholesystemcanbetreatedasasimplelinearmodelafterbeingcompensated,thentheproportional-derivative(PD)controllawisappliedtoenhancingthecontrolperformance.OnthebasisofLyapunovstabilitytheory,theglobalstabilityandtheasymptoticconvergenceofthetrackingerrorareproved.Numericalsimulationsdemonstratethattheproposedschemehaspotentialstorestraintheimpactofdisturbanceandimprovingthetrackingperfor

简介：WiththebackgroundofthecontrolofadditionalmechanicalforcedroplettransferinMIG/MAGwelding,regardingtheACservomotorascore,anoveloscillatingwirefeedingsystemhasbeendevelopedwithexcellentperformancesofcontrolanddynamicaccelerationwhichistested.Systemconstitutionandoperationprincipleareintroducedinthispaper.Influencesofparametersondynamicaccelerationperformanceareanalyzedanddiscussedemphatically,suchasoscillatingfrequency,oscillatingamplitudeanddraw-backspeed.Experimentalresultindicatesthataccordingtothetechniqueofweldingcontrol,thenovelwirefeedingsystemrespondsrapidlytovariouskindsofcontrolordersofwirefeedinganddraw-back,andrealizesflexiblecontrolofweldingwireaxialmovement,includingdynamicshifting,oscillatingandsoon.

简介：Controlmethodsofhysteresiscurrentvectorcontrolofpermanentmagnetsynchronousservodrivefedbyvoltagesourceinverterareexamined.Detaileddescriptionofthecontrolmethodsinstationaryreferenceframewithcircle,squareandhexagonshapetoleranceareausingadaptivesolutionsispresented.Thetheoreticalconsiderationsaresupportedbysimulationresults.

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简介：Electro-hydraulicservovalveisatypicalcomplicatedmulti-domainsystemconstitutedbymechanical,electric,hydraulicandmagneticcomponents,whichiswidelyusedinelectro-hydraulicservosystemssuchasconstructionmachinery,heavyequipment,weaponandsoforth.Thetraditionalmethodofmodelingandsimulationofservovalveisbasedonblockdiagramorsignalflow,whichcannotdescribetheservovalvesystemfromcomponentslevelnorbeusedinmodelingandsimulationofoverallservosystems.Intheprocedureoftraditionalmethod,computationalcausalitymustbeinvolvedinmodelingofservovalve,whichisinconvenienttoexecutemodificationoncomponentsorparameters.Modelicaisanobject-orientedmodelinglanguagewhichissuitedforlarge,complex,heterogeneousandmulti-domainsystems.ThekeyfeaturesofModelicaaremulti-domain,object-orientedandnon-causal,whicharesuitableformodelingofservovalveandmakethemodelreadable,reusable,andeasytomodify.Thesimulationresultsshowsimilarcurveswithtraditionalmethod.Thisnewservovalvemodelingandsimulationmethodcanprovidetheengineersamoreefficientwaytodesignandoptimizeaservovalveandanoverallservosystem.

简介：Adual-stageservosystemconsistsofaprimarycoarseactuatorforfacilitatinglargemotionandasecondarymicro-actuatorforsmallbutprecisemotiontoimprovetrackingperformance.Piezoelectricmicro-actuatormadefromleadzirconatetitanate(PZT)hasbeenapopularchoiceforthesecondarystage.However,theadvantagegainedbytheresolutionofthesecondaryPZTactuatorisreducedbyitsinherenthysteresisnonlinearity.Modelbasedhysteresiscompensationtechniquesarepreferredduetotheirsimplicityandfastresponse.Identificationandmodelingaretwosubstantialpartsinsuchmodel-basedtechniques.ThispaperpresentsarigorousanalysisandmodelingofthehysteresisofPZTmicro-actuator.ModifiedGeneralizedPrandtl-IshlinskiiandColeman-Hodgdonmodelsarestudied.Identificationofthemodelthroughnonlinearleastsquareandparticleswarmoptimizationareexaminedandcompared.Severalanalysesaredonethroughtuningofthemodelparametersandidentificationtechniques.Experimentalanalysisandsimulationresultsunderscoretheeffectivenessofthismodelingapproach.Finallyasadesignexample,adual-stagesimulationanalysisisdonetoshowtheeffectivenessofsystematicmodelingonhysteresiscompensation.

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简介：""Mensaytheyhatetoshop,""saysZhukin,CityUniversityofNewYorkSociology(社会学)professor.""Yetwhenyouaskthemdeeperquestions,itturnsoutthattheyliketoshop.Mengenerallyliketoshopforbooks,musicandhardware.Butifyouaskthemabouttheshoppingtheydoforbooksormusic,they'llsay,'Well,that'snotshopping.That'sresearch.'""

简介：Romanticismisanimportantstageintheevolutionofman’sself-consciousness.Itshowsnewinterestinandnewconcernwithmanandnature.Wordsworthiswell-knownasanaturepoet.Thethemeofhumanmindandnatureinhispoemshaslongattractedreaders’attention.However,hedoesnotindulgeinnatureitselfbuttakesitasconsolationandinspirationforhumankind.Inordertohighlightthepoet’sconcernwithhumanmind,thepresentpaperchoosestoexploreWordsworth’sconcernwithchildren’smind,basedontheanalysisofWordsworth’sThePreludeandmanyofhispoemsaboutchildren.

简介：Sinceancienttimes,asoneofthesymbolsofuglyanddirty,prostitutesareinvariablylivingintheblackmarginsofsociety.Facingprostitutes’miseries,peoplealwayscannotunderstandtheiremotions,mentalitiesanddesires,ortreatsthemasequals,particularlyaswomen.ProstitutesareaspecialgroupintheoppressedwomeninWesternsocieties.MargaretandNanaaretwotypicalimagesoftheminthehistoryofwesternliterature.Withtearsandlives,theydeducetheirmiserablelifestoriessimilarly.