(62) ,
11 + 2β1 + ω02 = f (t), (85)
f (t) , . f (t) = f0 cosωt, (63):
x = a cos(ωt - j),
a = f0/() (86)
,
tg j = 2βω/(ω02 ω2). (87)
:
V (ω) = ω f0/(),
A (ω) = ω2 f0/(). (88)
, (. 22), , , , .
(ω), V(ω), A(ω) 2.
2
(ω) | V(ω) = ω (ω) | A(ω) = ω2 (ω) | |
ω = | ωV = ω0 | = | |
(ω) = | V(ωV) = | A () = | |
(0) = | V(0) = 0 | A () = 0 | |
() = 0 | V( ) = 0 | A () = | |
tg φ(ω) = - | φ(ωV) = | tg φ() = = | |
β < ω0 |
V (ω) = ω f0/().
, V(ω) = f0/2β.
Q Q = .
=
, w w0:
.
. (89)
.
.
, , :
- () ;
- (β < ω0);
- ;
- (τ > 1/β).
, .. .
:
- , ( ) (. );
|
|
- (β > ω0);
- .
. , . k m.
F0 sinωt. , .
MX" = - KX k(X - x) + F0 sinωt,
m -
mx" = k(X - x).
k(X - x) , k; ,
. ,
X = A sinωt; x = a sinωt.
X" = -ω2 A sinωt x" = -ω2 a sinωt.
. :
- M ω2 A + KA + k(A - a) - F0 = 0,
- mω2a - k(A - a) = 0.
:
A = a.
, ω = ω0 = . = 0 = - F0/k. , = 0, .. = 0 , :
f12 = - k(X - x) = kx = - F0 sinωt = F0 sin(ωt + π),
.. . . .