电路仿真实验报告
2015年12月
姓名： 班级： 学号：
自强、弘毅、求是、拓新
目录
实验一直流电路 .............................................................................................................................. 3
实验目的 ................................................................................................................................... 3 实验内容 ................................................................................................................................... 3 实验二直流电路（二）................................................................................................................... 5 实验目的 ................................................................................................................................... 5 实验内容 ................................................................................................................................... 5 实验总结 ................................................................................................................................... 9 实验三正弦稳态 .............................................................................................................................. 9 实验目的 ................................................................................................................................... 9 实验内容 ................................................................................................................................... 9 实验总结 ................................................................................................................................. 11 实验四交流分析和网络函数......................................................................................................... 11 实验目的 ................................................................................................................................. 11 实验内容 ................................................................................................................................. 11 实验总结 ................................................................................................................................. 12 实验五动态电路 ............................................................................................................................ 13 实验目的......................................................................................................................................... 13 实验内容......................................................................................................................................... 13
实验总结 ................................................................................................................................. 20 实验六频率响应 ............................................................................................................................ 20 实验目的 ................................................................................................................................. 20 实验内容 ................................................................................................................................. 20 实验总结 ................................................................................................................................. 25 实验七 simulink仿真交流电路 ................................................................................................. 26 实验目的 ................................................................................................................................. 26 实验内容 ................................................................................................................................. 26 实验总结 ................................................................................................................................. 27
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自强、弘毅、求是、拓新
实验一直流电路
实验目的
1加深对直流电路的节点电压法和网孔电流法的理解。 2学习MATLAB的矩阵运算方法。
实验内容
1电阻电路的计算 如图，已知：R1=2，R2=6,R3=12,R4=8,R5=12,R6=4,R7=2. (1) 如Us=10V,求i3,u4,u7; (2) 如U4=4V,求Us,i3,i7. （1）
Z=[20 -12 0; -12 32 -12; 0 -12 18]; V=[10; 0; 0]; I=Z\\V;
IRB=I(1)-I(2);
fprintf('the current through R3 is %8.4f Amps \\n',IRB) U4=I(2)*8; U7=I(3)*2;
fprintf('the source through R4 is %8.4f V \\n',U4) fprintf('the source through R7 is %8.4f V \\n',U7)
结果：
the current through R3 is 0.3571 Amps the source through R4 is 2.8571 V the source through R7 is 0.4762 V
（2）
Z=[ -12 -12; 0 18]; V=[-16; 6]; I=Z\\V; I(3)=0.5;
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自强、弘毅、求是、拓新
U=I(1)*20-I(3)*12;
fprintf('the source is %8.4f V \\n',U) i3=I(1)-I(3); i7=I(2);
fprintf('the current through R3 is %8.4f Amps \\n',i3) fprintf('the current through R7 is %8.4f Amps \\n',i7) 结果
the source is 14.0000 V
the current through R3 is 0.5000 Amps the current through R7 is 0.3333 Amps
2求解电路里的电压，例如V1，V2，·····，V5 Y = [1 -1 2 -2 0; 0 5 -13 8 0; 2 0 4 -11 0; 176 -5 5 -196 0; 0 0 0 0 1];
I = [0 -200 -120 0 24]'; V = inv(Y)*I;
fprintf('V1=%fV\\nV2=%fV\\nV3=%fV\\nV4=%fV\\nV5=%fV\\n',V(1),V(2),V(3),V(4),V(5)) 仿真结果：
V1=117.479167V V2=299.770833V V3=193.937500V V4=102.791667V V5=24.000000V
3已知R1=R2=R3=4,R4=2,控制常数k1=0.5,k2=4,is=2,求i1和i2 Z = [1 0 0 0; -4 16 -8 -4; 0 0 1 0.5; 0 -8 4 6]; V = [2 0 0 0]'; I = inv(Z)*V; i1 = I(2)-I(3); i2 = I(4);
fprintf('i1=%f A\\ni2=%f A\\n',i1,i2) 仿真结果： i1=1.000000 A i2=1.000000 A
实验总结
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自强、弘毅、求是、拓新
1、仿真前需进行准确的计算，列出节点或回路表达式方可列出矩阵惊醒计算。 2、熟练矩阵运算公式，即：V=inv（Y）*I
实验二直流电路（二）
实验目的
1加深对戴维南定律，等效变换等的了解。 2进一步了解MATLAB在直流电路的应用。
实验内容
1 在图2-3，当RL从0改变到50KΩ，绘制负载功率损耗。检验当RL=10KΩ的最大功率损耗。
R=10;U=10;
RL=10;P=U^2*(RL*1000)/((R+RL)*1000)^2
RL=0:50;p=(RL*1000*U./((R+RL)*1000)).*U./((R+RL)*1000) figure(1),plot(RL,p),grid 程序运行结果： P =
0.0025 p =
Columns 1 through 7
0 0.0008 0.0014 0.0018 0.0020 0.0022 0.0023 Columns 8 through 14
0.0024 0.0025 0.0025 0.0025 0.0025 0.0025 0.0025 Columns 15 through 21
0.0024 0.0024 0.0024 0.0023 0.0023 0.0023 0.0022 Columns 22 through 28
0.0022 0.0021 0.0021 0.0021 0.0020 0.0020 0.0020 Columns 29 through 35
0.0019 0.0019 0.0019 0.0018 0.0018 0.0018 0.0018 Columns 36 through 42
0.0017 0.0017 0.0017 0.0016 0.0016 0.0016 0.0016 Columns 43 through 49
0.0016 0.0015 0.0015 0.0015 0.0015 0.0014 0.0014 Columns 50 through 51 0.0014 0.0014
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