.
. . . .
. .,
. .
: () u(t), i(t) . . . . , . . . . . .
.-. . . . . , . . .
:
i(t), u(t)=> =>i(p) u(p)=> . => - => => i(t) u(t)
F(p) Rep>c, 0 p=>oo, :
f(t)= f(p):=f(t)
. .
f(p)=F1(p)\F2(p) =
f(p)=1\(p(p+a)(p+b));
p(p+a)(p+b)=0; p1=0; p2=-a; p3=-b;
f2`(p)=(p^3+p^2a+p^2b+pab)`=3p^2+2ap+2bp+ab
f(t)= =1\ab+ + ;
I(p)=(0,86p+0,334)\(p^2+50p+10^5)
F2(p)=p^2+50p+10^5=0=>p1,2=-25+-j315;
F2`(p)=2p+50;
I(t)=(0,286*(-25+j315)+33,4)e^p1t\2j315+(0,268(-25-j315)+33,4e^p2t)\-2j315=0,235e^-27tcos(35t-17,5);
24. . r, L, c .
1.
2.
3.
. .
4. -
.
5. .
6.
1. il(0-)=\(r1+r2); Uc(0-)=i2(0-)*r2;
2.
3.I2(p)=(E\p+iL(0-)*L)\(r2+pL);
I3(p)= =
I2(p)=(E\L)\(p*((r2\L)+p))+IL(0)\ ((r2\L)+p)
i2(t)= +IL(0-)*
RL- ( ).
iL(t), UL(t);
1.
2. .
I(p)=E/r+pL=M(p)/N(p)
i (p)
F(p)=M(p)/N(p) f(t)= e^p t, p - N(p)=0
r+pL=0
p=-r\L
f(t)=E/L * e^(-rt/L)
RL- ( ).
iL(t), UL(t);
1.
2. .
I(p)=L*i(0)/(r1+r2+pL)=M(p)/N(p)
i (p)
|
|
F(p)=M(p)/N(p) f(t)= e^p t, p - N(p)=0
r1+r2+pL=0
p=-(r1+r2)\L
f(t)=E(r1+r2)/r1^2 * e^(-rt/L)