實(shí)驗(yàn) 正弦穩(wěn)態(tài)電路的計(jì)算

實(shí)驗(yàn)7正弦穩(wěn)態(tài)電路的計(jì)算MATLAB的復(fù)數(shù)計(jì)算MATLAB的繪圖功能計(jì)算舉例1MATLAB的復(fù)數(shù)計(jì)算復(fù)數(shù)表示代數(shù)式:x=3+j*4j或I為虛數(shù)單位.指數(shù)式:y=5*exp(-j*53.1*pi/180)表示553.1互相轉(zhuǎn)換代數(shù)式指數(shù)式Xm=abs(x),Xp=angle(x)*180/pi指數(shù)式代數(shù)式Y(jié)=Xm*exp(j*Xp*pi/180)計(jì)算同實(shí)數(shù)一樣計(jì)算.2舉例方法1:阻抗串并聯(lián)數(shù)學(xué)模型已知U=8V,Z=1-j0.5,Z1=1+j1,Z2=3-j1,求各電流和畫出相量圖.3MATLAB程序Z=1-j*0.5;Z1=1+j;Z2=3-j;U=8;Zi=Z+(Z1*Z2)/(Z1+Z2);I=U/Zi;I1=Z2/(Z1+Z2)*I;I2=I-I1;disp('II1I2')disp('幅值');disp(abs([I,I1,I2]))disp('相角');disp(angle([I,I1,I2])*180/pi)ha=compass([I,I1,I2]);set(ha,'linewidth',2)4方法2:節(jié)點(diǎn)法數(shù)學(xué)模型程序

Un=U/Z/(1/Z1+1/Z2+1/Z);

I=(U-Un)/Z;I1=Un/Z1;I2=Un/Z2;5方法3:戴維南定理數(shù)學(xué)模型程序

Uth=Z1*U/(Z1+Z);Zth=Z1*Z/(Z1+Z);I2=Uth/(Zth+Z2);I1=Z2*I2/Z1;I=I1+I2;6MATLAB的繪圖功能plot(x,y,'linewidth',2)t=0:0.01:5;y=2*exp(-t/2).*cos(5*t);plot(t,y,'linewidth',2)或t=linspace(0,5,300);y=2*exp(-t/2).*cos(5*t);plot(t,y,'linewidth',2)標(biāo)題和坐標(biāo)title('指數(shù)衰減正弦波')xlabel('時(shí)間(秒)'),ylabel('函數(shù)值')加網(wǎng)格grid7舉例數(shù)學(xué)模型已知U=8V,Z=1-j0.5,Z1=1+j1,Z2=3-j1,=1000rad/s.繪出負(fù)載RL的PL與C或RL的關(guān)系曲線.8MATLAB繪P與C或RL的關(guān)系P與C的關(guān)系曲線c=linspace(0.1,0.24,500);w=100;RL=1,P1=abs(Uth)^2*RL./((real(Zth)+RL)^2+(imag(Zth)-1./(w*c)).^2);[P1maxI]=max(P1),C=c(I)figure(2),plot(c,P1,'linewidth',2),gridP與RL的關(guān)系曲線RL=linspace(0.1,1.5,500);P2=abs(Uth)^2.*RL./((real(Zth)+RL).^2+(imag(Zth)-1/(w*C)).^2);figure(3),plot(RL,P2,'linewidth',2),grid[P2maxI]=max(P2),R=RL(I)9注意休事項(xiàng)建立祥數(shù)學(xué)涂模型根據(jù)威數(shù)學(xué)羨模型竄寫程峽序繪制吐曲線球時(shí)選挎好自舞變量證的范拐圍先計(jì)加算最族大功們率時(shí)C應(yīng)為出多少?這樣C的取乏值范遮圍就底可有雀目的病的調(diào)隱整.同理,可先堵計(jì)算強(qiáng)最大爬功率釀時(shí)的RL.用ma畢x(謊)函數(shù)黃找最橋大功絞率及勢(shì)對(duì)應(yīng)誼的C或RL值.并與呢理論俘計(jì)算沾核對(duì).繪制蝴的曲蒸線可狀加標(biāo)齡題,網(wǎng)絡(luò),橫縱刺坐標(biāo)姻說明.有多盯幅圖拴時(shí)用fi絕gu臺(tái)re羞(n