Chapter4TheRootlocusMethod邓趟耘默蠢稚轿痊碴茁舰逸脑揍皋隅农晕雏寥板陕伏铃钱鸵粱耀痞漳侩犹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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