文档介绍：:..,其开环传递函数如下所示。试利用rlociis函数,分别得到0<尺<oo时的根轨迹图。1?+4s2+65+1»num=[l];den=[l461];»rlocus(num,den)RootLocus41 , , , 321o1SXVAJC0UI6EEI-2-<AJEUI6eEIRootLocus•1- -3 --2 --1-(C)G(5)=52+5+1+4s+6)(b)G(5)=»num=[l2];den=[l21];»rlocus(num,den);----»num=[l1l];den=[l460];»rlocus(num,den);RootLocussixyAJeu!603EI--4 - -3--2 --1-+45+65+85+65+45*6+2夕5+2夕4+夕3+5*2+10s+1»num=[l46864];den=[l2211101];»rlocus(num,den);••oo■sx<>tJcoca>EEI•1-•255-4 -3 -2 -1 (52-25+2)KG(s)=K^— \;能使系统稳定的K最大值为»num=[l-22];den=[l320];»gh=tf(num,den);»rlocus(gh);»[K,p]=rlocfind(gh)运行结果为:RootLocusx>①•的003":ghGain::-+:(%):(rad/s)::ghGain::+:-(%):447Frequency(rad/s):•-5•4-3•2RealAxis(seconds"Selectapointinthegraphicswindowselected_point=+■+•:根轨迹往虚轴右侧,K值变大;往虚轴左侧,K值变小,与虚轴的交点K=,即为最大值c4-,其中二当闭环主极点的阻尼比为(=,确定K的取值。»num=[ll];den=[l00];»rlocus(num,den); e Jr111\11System:ghGain:2Pole:--:(%):(rad/sec):—■•1•