简介:Afaultdiagnosismodelisproposedbasedonfuzzysupportvectormachine(FSVM)combinedwithfuzzyclustering(FC).Consideringtherelationshipbetweenthesamplepointandnon-selfclass,FCalgorithmisappliedtogeneratefuzzymemberships.Inthealgorithm,sampleweightsbasedonadistributiondensityfunctionofdatapointandgeneticalgorithm(GA)areintroducedtoenhancetheperformanceofFC.Thenamulti-classFSVMwithradialbasisfunctionkernelisestablishedaccordingtodirectedacyclicgraphalgorithm,thepenaltyfactorandkernelparameterofwhichareoptimizedbyGA.Finally,themodelisexecutedformulti-classfaultdiagnosisofrollingelementbearings.Theresultsshowthatthepresentedmodelachieveshighperformancesbothinidentifyingfaulttypesandfaultdegrees.TheperformancecomparisonsofthepresentedmodelwithSVManddistance-basedFSVMfornoisycasedemonstratethecapacityofdealingwithnoiseandgeneralization.
简介:Asymmetricstereoscopicvideocodingcantakeadvantageofbinocularsuppressioninhumanvisionbyrepresentingoneofthetwoviewsinlowerquality.Thispaperproposesabitallocationstrategyforasymmetricstereoscopicvideocoding.Inordertoimprovetheaccuracyofbitallocationandratecontrolintheleftview,aproportionalintegral-derivativecontrollerisadopted.Meanwhile,tocontrolthequalityfluctuationbetweenconsecutiveframesoftheleftview,aqualitycontrollerisadopted.Besides,afuzzycontrollerisproposedtocontrolthevariationinqualitybetweentheleftandrightviewsbycomparingthePSNRdisparityoftwoviewswithafixedthreshold,whichisusedtoquantizethebinocularpsycho-visualredundancyandadjustthequantizationparameter(QP)oftherightviewcorrespondingly.TheproposedalgorithmhasbeenimplementedinH.264/AVCvideocodec,andtheexperimentalresultsshowitseffectivenessinratecontrolwhilekeepingagoodqualityfortheleftview,andfewerbitsareallocatedfortherightviewsothattheoverallbitrateissavedby7.2%atmostwithoutthelossofsubjectivevisualqualityforstereoscopicvideo.
简介:根据输入的开车的率更新参数,率依赖者Prandtl-Ishlinskii(PI)模型广泛地在磁滞现象建模和赔偿被使用。以便改进当模特儿的精确性,独立以低、高的开车的率识别的二个PI模型通过一条联合法律被合并。为驾驶piezo的基于弯曲的机制,低抑制比率使使结构的颤动激动容易。作为结果,测量磁滞现象环极大地被弄歪,识别PI模型的当模特儿的精确性显著地被影响。在这份报纸,作为控制输入利用附加正弦曲线信号的一个新奇时间有效的参数鉴定方法被建议。这个方法有效地避免结构的颤动的刺激。另外,作为附加正弦曲线信号的开车的率盖住一个宽范围,为为率依赖建模要求的所有系数能通过仅仅试验性的数据的一个集合被识别。当模特儿的磁滞现象和追踪实验的轨道在2-DOF上被执行驾驶piezo的基于弯曲的机制。试验性的结果证明联合磁滞现象模型在基于弯曲的机制的全部工作范围上维持当模特儿的精确性。机制磁滞现象被反的PI模型的使用显著地作为前馈控制控制器压制;并且当一个反馈环也被合并时,更好的结果被完成。基于弯曲的机制的追踪的表演极大地被改进。
简介:Effectivelyandaccuratelymodellingthespatialrelationoffracturesurfacesiscrucialinthedesignandconstructionoflargehydropowerdamshavingacomplexunderlyinggeology.However,fracturesurfacesarerandomlyformedandvarygreatlywithrespecttotheirspatialdistribution,whichmakestheconstructionofaccurate3-Dmodelschallenging.Inthisstudy,weuseanoptimalMonteCarlosimulationanddynamicconditioningtoconstructafracturenetworkmodel.WefoundtheoptimalMonteCarlosimulationtoeffectivelyreducetheerrorassociatedwiththeMonteCarlomethodandusedynamicconditioningtoensuretheconsistencyofthemodelwiththeactualdistributionoffracturesontheexcavationfacesandoutcrops.WeappliedthisnovelapproachtoahydropowerstationontheJinshajiangRiver,China.Thesimulationresultsmatchedtherealsampledvalueswell,confirmingthatthemodeliscapableofeffectivelyandaccuratelysimulatingthespatialrelationsinafracturenetwork.
简介:Gaitrecognitionisthekeyquestionoffunctionalelectricalstimulation(FES)systemcontrolforparaplegicwalking.Anewrisk-tendency-graph(RTG)methodwasproposedtorecognizethestabilityinformationinFES-assistedwalkinggait.Themaininstrumentwasaspecializedwalkerdynamometersystembasedonamulti-channelstrain-gaugebridgenetworkfixedonthewalkerframe.Duringwalkingprocess,thissystemcollectedthereactionforcesbetweenpatient'supperextremitiesandwalkerandconvertedthemintoRTGmorphologiccurvesofdynamicgaitstabilityintemporalandspatialdomains.TodemonstratethepotentialusefulnessofRTG,preliminaryclinicaltrialsweredonewithparaplegicpatients.Thegaitstabilitylevelsoftwowalkingcaseswith4-and12-weekFEStrainingfromonesubjectwerequantified(0.43and0.19)fromtheresultsoftemporalandspatialRTG.Relevantinstablephasesingaitcycleanddangerousinclinationsofpatient'sbodyduringwalkingprocesswerealsobroughtforward.Inconclusion,thenewRTGmethodispracticalfordistinguishingmoreusefulgaitstabilityinformationforFESsystemcontrol.
简介:由于多来源的复杂性质地质的数据,通过一个单身者重建每地质的结构是困难的3D建模方法。在这分析提出的多来源数据解释方法基于地质的数据的分离、不规则的特征上的一个数据库驱动的模式和焦点。从盖住精确性,分辨率,数量和质量的一个范围的许多来源的地质的数据被分类并且根据他们为3D建模的可靠性和一致性综合。有不一致的合理B花键(NURBS)技术的地质的表面的新插值近似试穿构造算法然后被介绍。NURBS技术能为精确性,表面连续性和地质的结构的数据存储在要求之中保留平衡。最后,四其他的3D建模途径与一些例子的参考被表明,它根据数据数量和精确性说明被选择。建议途径为不同实际工程要求提供灵活当模特儿的模式。
简介:Comparedwithurbanfloods,dam-breakfloodsareassociatedwithgreateruncertainties,includingvariabledam-breakmodesandhydrologicalcharacteristics,soconventionalfloodestimationmethodscannotbedirectlyappliedintheestimationofdam-breakfloodloss.Inparticular,thereisscantinformationregardingtheconditionsofaffectedareaandhydrologicalcharacteristicsinsouthwestChina.Inthispaper,weintroduceanintegratedmodelforestimatingfloodlossthatisadaptedtothemountainousregionsofsouthwesternChinainlightoftherelativelackofavailableinformation.Thismodelhasthreemajorcomponents:abasicinformationmodel,adam-routedfloodpropagationsimulationmodel,andalossestimationmodel.Weestablishedthebasicinformationmodeldespitetherelativelackofavailableinformationusing3Stechnology[remotesensing(RS);geographicalinformationsystem(GIS);globalpositioningsystem(GPS)],dataminingtechnology,andstatisticalanalysistechniques.Ourdam-routedfloodpropagationsimulationmodelconsistsofmajorhydrologicprocessesandtheirgoverningequationsforflowpropagation,whichwesolveusingfinite-differenceschemes.Inthismodel,thefloodpropagationareaisdividedintogridsandeachgridisdeterminedbythecharacteristicparametersobtainedfromthepropagationsimulation.WepresentacasestudyoftheLianghekouhydropowerstationinSichuanProvince,Chinatoillustratethepracticalapplicationofthisintegratedmodelforlifelossestimation.
简介:在这份报纸,许多三维(3D)数字胸模型基于临床的磁性的回声图象(MRI)被开发。一个混合轮廓察觉方法被用来创造轮廓,并且内部空间充满不同的胸纸巾,与相应于MRI象素紧张的指定间隔的各个。发达模型解剖地在乳房描述复杂织物结构和绝缘的性质。而且,他们与finite-difference-time-domain(FDTD)兼容格子房间。Convolutional完成式匹配的层(CPML)与FDTD一起被使用在模型外面模仿开的边界。在测试阶段,微波乳癌察觉模拟与改变X光线照相术的密度在四个模型被执行。然后,共焦的算法被利用重建肿瘤图象。成像结果证明肿瘤voxels能在每种情况中被认出,与在二个低密度盒子中的2公里地点错误和在二个高密度盒子中的7个mm8公里地点错误,证明导出MRI的模型能描绘病人乳房之间的单个差别。
简介:基于自动电压,控制(AVC)和电池精力存储控制的改进自动电压协作控制策略(AVCCS)(BESC)被建议让光电的连接格子的系统(PVGS)减轻环境骚乱引起的电压变化。当小环境骚乱发生时,仅仅AVC被使用,当BESC与当大骚乱发生时,制止电压变化的AVC被合并时。决定电压变化的允许的振幅的一个可调节的参数被介绍认识到上述切换的进程。一个基准低电压分发系统包括PVGS被使用商业软件建立挖沉默。模拟结果证明在AVCCS下面的电压满足IEEE标准1547,并且安装电池电容是也减少了。同时,电池服务生活被在控制过程避免经常的控告/解除扩大。
简介:AdataacquisitionsystembasedonLabVIEWisdesignedandimplemented,andelectro-discharge(ED)finetruingofmetal-bondedfine-graindiamondwheelbasedonreal-timemonitoringisresearched.Real-timemonitoringnotonlymakesefficientimpulsespecificationofEDtruingeasilyobtained,butalsoisgoodfortimelyidentifyingno-load,avoidingshortcircuitandarcdischargephenomenaandthenforobtainingnormalmachiningstate.EDfinetruingofthefine-grainwheelincludestwosteps:roughtruingforhighefficiencyandfinetruingforhighprecision.FinalEDtruingprecisionandefficiencynotonlydependonelectricprocessspecification,butalsoisconcernedwithelectrodeshape,insulatedperformanceofoperatingfluidandverticalfeedquantityvalueandfrequency.ExperimentsindicatethatEDfinetruingbasedonreal-timemonitoringcanimprovethetruingprecisionandefficiency.AveragemachiningefficiencyofW10wheelisabout0.95μm/min;thefinalrun-outbyEDtruingislessthan2μm.