Chapter4TheRootlocusMethod斟撞烩批咆宁盂障讥鸽摈审冠沫癸叮翔粕乃绢配泞千编胡蚌丈散超诌放蹄chapter4chapter4*-(conventionalroot-locus)-locusandthezero-degreeroot---,:WecanutilizetheRoot-locustechniquetomakeupforthedefectsabove.(1)Itisadifficultthingtosolvetheoutputresponseofasystem–especiallyforahigherordersystem.(2)Wecan’teasilyinvestigatethechangesofasystem’sperformancefromthetime-domainsolutionofthesystem’soutputresponsewhenoneortwoparametersofthesystemvariesinagivenrange,or,whenoneormoredevicesareaddedtothesystemtoimprovethesystem’-locusisagraphicaltechniquebaseonfthepolesandzerosoftheopen-looptransferfunctionfordeterminingthepolesoftheclosed--locustechnique,Wecaneasilyinvestigatetheperformancechangewhenoneortwoparametersofthesystemvariesinagivenrange:;-:Root--locusmethodandFrequencyResponsemethod,whichwasconceivedbyNyquistin1938andBodein1945,-ordingtofollowingorder:1).whatisRoot-locus?2).Howtheroot-locusplotofasystemissketched?3).Howtheperformanceinformationisanalyzedfromtherootlocusofasystem.(plotting)(analysisoftherootlocus)(onceptionoftheroot-locus).?:forthesystemsh
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