2.1
() f (t)
F (p)
f (t) | F (p) |
A d(t) | A |
A 1(t) | |
Ae a t | |
A cos w t | |
A sin w t | |
. 2.1
2.1
, . 2.2, t = 0 . , U 0 = 10 , L = 1 , R = 10 . .
iL (0) = iL (0+) = U 0/ R = 1 . t > 0 ( ) (. 2.3).
.
:
.
.
iL (t) = 2 e 5 t, .
iL (0) = 2 1 = 1 ; iL (¥) = 2 .
. 2.4 |
, . . 2.4 .
2.2
. 2.5 |
, . 2.5, t = 0 . iC (t) uC (t) . .
uC (0) = uC (0+) = I 0 R /2. (t > 0, ), . 2.6, uC (0)/ p, (. 2.7).
II (. 2.7) IC (p):
,
.
.
iC (t) 2.1:
.
uC (t) UC (p)
.
A 1 A 2,
,
, A 1 = 4;
A 1 + A 2 = 1, A 2 = 3.
.
. 2.1
.
, uC (¥) = 2 I 0 R;
, iC (¥) = 0.
, .
. 2.8
. 2.8 .
3
1-
3.1
, . 3.1, h (t) g (t) .
|
|
. 3.1 | . 3.2 |
(. 3.2); , .
I 2(p) U 1(p) I 1(p):
.
h (t) £ .
.
g (t) £ H (p).
.
A 0 1,
,
A 0 = 1; , .
;
.
h (t) t > 0 . 3.3.
. 3.3
2-
3.2
, . 3.4, h (t) , R = 100 , = 1 , K = 3.
H (j w) . h (t) .
ARC - .
(. 3.5), . 3.2.
L - :
G = .
U 3(p) U 4(p) U 2(p):
.
.
.
h (t):
h (t) £ ,
.
p 1 p 2:
p 2 + 33,3×103 p + 3,33×107 = 0,
,
p 1,2 = 1,67×103 j 5,53×103.
- p 1 p 2 - , . . :
,
.
,
. 3.6
h (t) MathCad (. 3.6).
(. 3.6):
t = 0 h (0) = 1,046cos16,8 = 1,046×0,0997 = 1;
t = ¥ h (¥) = 0.
H (j w) - | H (j w)| Q(w) :
.
.
ARC - 2- w Q :
, w0 Q , , ARC - .
.
:
.
(. 3.7) (. 3.8) MathCad.
- | H (j w)| :
w = 0 H (0) = 0; w = ¥ H (¥) = 1.
. 3.7
. 3.8
, AR - , :
,
.
| H (j w)| w = 5,77×103 1:
, AR - 2- RLC -.
|
|
AR - (U 1 = 0) (. 3.9).
. 3.9 | . 3.10 |
(. 3.10) B (p) ( ).
L - :
,
.
.
w0, Jm B (j w0) = 0 , Re B (j w0) = , , B (j w) (1, j 0) , .
B (j w) MathCad (. 3.11).
, w = 0,10 106.
. 3.11
K = 4, , w0 =5,77×103 1.
4