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81224+1UC1(s)+s321s___ss+8+_UC2(s)
5(s?1.2)(s?4)11111 Us()?(??)(Us)??24832248ss(?1)(s?3)818ss2?(12?)s?ss311?4(s?1)(s?3)s3?1?3?t3?3tt3t u?(1?e?e)()tVu?(1?e?e)()tVC1C25s?12.8844UC2(s)?2s(s?1)(s?3)UC1(s)????【题14】:
111?0.4(1??)U()s?? Li(0)?0.4i(0)?0.6A11?1?2262s?2ss2??s3333(.04s?1)(s?3) Us()?ss(?2)(s?4)U111131I(s)???? 26?2s16s40s?280s?411?3?2t4ti?(?e?e)(t)A 2164080?【题15】:
U?Li(0)?0.6i(0)?0.A1 Li(0)?0.2i(0)?0.9A22?1?11?2?12.s?3
s(s?2)(s?4)31619133?9?2t4t i? I???(?e?e)(t)A8s40s?240s?482040?或i ?0.375?0.e15?0.225e(t)A【题16】:
?+?2t?4t??IL(s)0.50.5sU(s)_2s12.5s0.5_+
s2?43.960.04044(s?25)22(s?25)12.5(s)???s)?2 IL( I Us()??2Ls2ss?0.5051s?49.495sss(?50s?25)s?50s?252???212.5s?0.505t?49.5t i?(4?3.e96?0.e04)(t)AL?【题17】:
I(s)10?100?s12s13s?40?s?Uc2(s)?
100?4014064246s U I(s)??()s?Is()???C211113ssss?110??s?22s3s12 u()t?(64?24e)()tVC2【题18】:
作s域模型,选用网孔法
t?12?(2?s)I1(s)?sI2(s)?12?2U(s)s1 ?sI1(s)?(s??2)I2(s)?2U(s) 解得:
6(s?4)sU)?2I2(s)?o(s(s?27.)(s?05.6)U(s)?2I1(s)?0.56t?2.7t u(t)?(9.e64?3.e64)(t)VoI2(s)?12(s?4)4s2?13s?6?【题19】:
i u(0)?1V(0)?2AC?L?复频域模型如图
节点方程:(??87s112s?20 得 ??U(s)?)Us()?0.1?CC21022.5sss?5s?4s?4s?11?4t?t , t?0 it()?ut()?(4e?3.e)5AC2
第十五章 电路方程的矩阵形式答案 题1
(1)?2(2)?4(3)?56(4)?8?(5)1379
(画错一条(包括方向错误)扣2分,错4条以上则无分) 题2:(C) 题3:(D) 题4:(C) 题5:(C) 题6:(A) 题7:
?)(0
题8:
题9:
题10:
diduC1du C2??0.2uC2?iLL? ??0.5i0.5i0.5u?0.5uL?SC1C2dtdtdt题11:
题12:
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