f (t) = , (1.3.2)
j (j 2 = 1), (1.3.2) s.
(Web- MCS), (1.3.1) (1.3.2). 1.3.1.
s
s º . (1.3.3)
. (1.3.4)
( 2.1.3) . (2.1.3) 1.3.1
B [ s 2 Y (s) sy (0)d y (0)/d t ]+ C [ sY (s)y(0)] + DY (s) = X (s). (1.3.5)
x (t) = 0 ( ), y (0) = y 0 d y (0)/d t = 0,
Bs 2 Y (s) Bs y 0 + CsY (s) Cy 0 + DY (s) = 0. (1.3.6)
1.3.1
f (t) | F (s) |
, q (t) | 1/ s |
d (t) | |
tn | n!/ sn +1 |
sin(w t) | w /(s 2 + w 2) |
cos(w t) | s /(s 2 + w 2) |
exp(- at) | 1/(s + a) |
f (k) (t) = d k f (t)/d tk | skF (s)- sk -1 f (0)- sk -2 f (0)-- - sf (k -1)(0) |
F (s)/ s + (1/ s) | |
exp(- at) sin(w t) | w /[(s 2 + a 2) + w 2] |
exp(- at) cos(w t) | (s + a)/[(s 2 + a 2) + w 2] |
Y (s),
Y (s) = . (1.3.7)
q (s) = Bs 2 + Cs + D, (1.3.7), , , , ( ) . p (s) = (Bs + + C) y 0, (1.3.7), . Y (s) , . s - () .
q (s)
q (s) = (s s 1) (s s 2), (1.3.8)
s 1 s 2 .
Y (s) = . (1.3.9)
1.3.1. , D / B = 2, / B = 3. (1.3.9)
Y (s) = . (1.3.10)
s - . 1.3.1, s = s + jw
. 1.3.1
, (1.3.9) ,
Y (s) = , (1.3.11)
k 1 k 2 , .
(1.3.11)
y (t) = L-1{ }= L-1{ }+L-1{ }.
(1.3.12)
1.3.1
y (t) = k 1exp(s 1 t) + k 2 k 1exp(s 2 t) (1.3.13)
(2.1.3) , .., , .
, , y (t). , :
|
|
(1.3.14)
Y (s) s - (. . 1.3.1), , .
1.3.1 =0. , y (t) = 0.
.
, .
( ) .
(2.1.3) , (1.3.5)
Bs 2 Y (s) + CsY (s) + DY (s) = X (s). (1.3.15)
(1.3.16)
1.3.2. RC , . 1.3.2,
U 1(s) = [ R +1/ Cs ] I (s), (1.3.17)
U 2(s) = I (s) / Cs.
. 1.3.2
(1.3.17) ,
, (1.3.18)
t = RC .
1.3.3. , . 1.3.1, c U 0 q (t), q (t) . ?
U 1(s) = U 0/ s (. 1.3.1), (1.3.18)
U 2(s) = U 1(s) = U 0 = U 0[ ].
u 2(t) = U 0 [1 exp( t / t)]. (1.3.19)
() .
1.3.4.
y (n) + q n-1 y (n-1) ++ q 0 y = p n-1 x (n-1) + p n-2 x (n-2) ++ p 0 x, (1.3.20)
y (t) , x (t) .
, (1.3.20)
s n Y (s) + q n-1 s n-1 Y (s) ++ q 0 = (1.3.21)
= p n-1 s n-1 X (s) + p n-2 s n-2 X (s) ++ p 0 X (s).
, , ,
Y (s) = , (1.3.22)