简介:Duetotheindividualelectricalandmechanicalcharacteristicsofresistanceweldingmachines,choiceoftherightmachineandweldingparametersforanoptimizedproductionisoftendifficult.Thisisespeciallythecaseinprojectionweldingofcomplexjoints.Inthispaper,anewapproachofcharacterizingtheelectricalpropertiesofACresistanceweldingmachinesispresented,involvingtestingandmathematicalmodellingoftheweldcurrent,thefiringangleandtheconductionangleofsiliconcontrolledrectifierswiththeaidofaseriesofproofresistances.Themodelpredictstheweldcurrentandtheconductionangle(orheatsetting)ateachsetcurrent,whentheworkpieceresistanceisgiven.
简介:Thispaperintroducedthebasictheoryandalgorithmofthesurrogatedatamethod,whichproposedarigorouswaytodetecttherandomandseeminglystochasticcharacteristicsinasystem.TheGaussiandataandtheRosslerdatawereusedtoshowtheavailabilityandeffectivityofthismethod.Accordingtotheanalysisbythismethodbasedontheshort-circuitingcurrentsignalsundertheconditionsofthesamevoltageanddifferentwirefeedspeeds,itisdemonstratedthattheelectricalsignalstimeseriesexhibitapparentlyrandomnesswhentheweldingparametersdonotmatch.However,theelectricalsignalstimeseriesaredeterministicwhenamatchisfound.Thestabilityofshort-circuitingtransferprocesscouldbejudgedexactlybythemethodofsurrogatedata.