8.
, . 8.1 , .. , .
8.1
8.2
- () , , .
8.3
2 : . 1- τ . 2- τ . , 2- .
8.4
2 : .
2- : , , ( 8.5,). (), , 8.5,.
8.5
( ) .
8.1 -
1,5 0,6 0,3 0,15 0,06 0,03 0,015 0,006 |
- . , .
- 1- ;
- 2- ;
- k- .
Z-
z-. t , Z.
.
.
,
. (8.1)
1. z- .
.
,
.
8.2 t Z P
F(t) | - | Z- |
1(t) t t2 exp(-at) | 1/ 1 /p2 1 /p3 1/(p+a) | z / z-1 Tz / (z-1)2 T2z(z+1) /(z-1)3 z/ (z-e-at) |
2. x(t) = 1(t). z- .
,
x(z) = 1 + z-1 + z-2 +..+z-n.
z-1
|
|
x(z) ∙ z-1 = z-1 + z-2 + z-n-1,
x(z), x(z) ∙ z-1.
x(z) x(z) ∙ z-1 = 1.
3. x(t)= t ∙ 1(t). z-.
x(z) ∙ z-1 = Tz-2 + 2Tz-3 + ;
Z-
1) . f1(t) f2(t) z-,
.
2) . f(t) z- F(z),
3) . f(t) z- F(z),
4. z- 1(t) .
4) ( ). f(t) f(z),
5) . f(t) z- F(z) ,
, f(t) t=0 F(z) z = ∞.
6) . f(t) z- F(z) (1-z-1)F(z) ,
.
5. f(nT) z-
, .. . ,
7) . z- f(t,a) F(z,a), ,
6. z- f(t) = te-αt .
z-
. z- z- . z- F(z) f(nT), f(t) t = nT.
8.6 , z- , z/(z-1) . z- , t=0,T,2T. z- .
8.6
z- z-
.
z- . . F(p)
, (8.2)
, , F(p); , , F(p) .
1.2
.
z- F(z) (8.2), 8.2 z- A/(z + a)
. 8.2 , z- Az/(z e-at) Ae-anT.
, F(z)/z. F(z)/z z F(z).
|
|
7. z-,
.
(8.2)
; .
1.2
.