简介:Thispaperpresentsfuzzy-baseddesignforthecontrolofoverheadcrane.Insteadofanalyzingthecomplexnonlinearcranesystem,theproposedapproachusessimplebuteffectivewaytocontrolthecrane.Therearetwinfuzzycontrollerswhichdealwiththefeedbackinformation,thepositionoftrolleycraneandtheswingangleofload,tosuppresstheswayandacceleratethespeedwhenthecranetransportstheheavyload.Thisapproachsimplifiesthedesigningprocedureofcranecontroller;besides,thetwincontrollermethodreducestherulenumberwhenfulfillingthefuzzysystem.Finally,experimentalresultsthroughthecranemodeldemonstratetheeffectivenessofthescheme.
简介:Inthispaper,weanalyzethefuzzyreliabilityofparalleling-seriessystem,focusingonthesituationoftheearlyfailuremode.TheearlyfailuremodeoffuzzyreliabilitymainlyobeystheWeibulldistribution.Basedonthis,weobtainthedistributionfunction,densityfunction,failurefunction,reliabilityfunctionandtheformulaofthemeantimetofailure.Fortheparalleling-seriessystemcomposedofmultiplecomponents,C1j,C2j,Cnj…,Cnj(j=1,2,…,K),especiallywhenη=1,mij=m,i=1,…n,j=1,2,…,k,wealsoobtainthecorrespondingformulas.Finally,weciteanexampletoverifytheformulaanddeepentheunderstanding.
简介:Inthispaper,weanalyzethefuzzyreliabilityofparallelingsystem,focusingonthesituationoftheearlyfailuremode.TheearlyfailuremodeoffuzzyreliabilitymainlyobeystheWeibulldistribution.Basedonthis,weobtainthedistributionfunction,densityfunction,failurefunction,reliabilityfunctionandtheformulaofthemeantimetofailure.Fortheparallelingsystemcomposedofmultiplecomponents,C1,C2,???,Cn,especiallywhenη=1,wealsoobtainthecorrespondingformulas.Finally,weciteanexampletoverifytheformulaanddeepentheunderstanding.
简介:Inthispaper,themathematicaltheoryoffuzzyprobabilityisusedfortheproblemsofrockmassmechanicsduetoexcavation,especiallymining.Amathematicalmodelisdevelopedforthemovementanddeformationofrockmassonthebasisoftheassumptionthatthedisplacementanddeformationofrockmassisafuzzyevent,andfromthismodeltheoreticalformulasarederivedforcalculatingthedisplacementofrockmassduetoexcavationThetheoriesofboththetwo-andthree-dimensionalproblemsaredevelopedandappliedtotheanalysisofengineeringproblemsinexcavation.Theagreementofthetheoreticalresultswiththefieldmeasurementsshowsthatourmodelissatisfactoryandtheformulaeobtainedarevalidandthuscanbeeffectivelyusedforpredictingthedisplacementsanddeformationsandthesafetyevaluationofthebuildingsonthegroundsurface.