Механика УМК
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. 4.7
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R -
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x R cos t y R cos( t ),
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3.2.1.6 .
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Fx = kx . -
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Fñ r , |
(4.43) |
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0 — -
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(4.46)
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x 2 x 2 x 0. |
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(4.48) (4.12) (
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2 x , x . (4.48), (4.12), -
.
(4.48) (4.12),
x(t) :
x(t) e tu(t) , |
(4.49) |
u(t) — , .
, (4.49)
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x e t e t u , |
x 2e tu 2 e t u e t u , |
(4.50) |
(4.50) (4.49) (4.48). -
e t ,
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2 )u 0. |
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u 2u 0. |
(4.53) |
(4.53) (4.12) -
, (4.53) -
u (t), 20 2 .
(4.12) -
(4.1), (4.53):
u(t) A0 cos( t ), |
(4.54) |
À0 — . (4.54) (4.49)
(4.48) -
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x(t) A e t cos( t ). |
(4.55) |
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( ), -
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A(t), -
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A(t) A e t . |
(4.56) |
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(t) (4.56) . 4.8, . . 4.8, -
x(t) , (4.55).
A(t) A(t); x0
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:
x(0) x0 A0 cos . |
(4.57) |
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(4.58) |
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(4.59) |
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, 20 , -
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-
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, (4.56), :
A(t) A e t , |
A(t T ) A e (t T) |
0 |
0 |
A(t) |
e Ò . |
(4.61) |
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A(t T )
; -
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, e Ò . (4.61) -
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d -
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A BBYY |
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d ln |
(4.62) |
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. -
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(4.73) |
F0 – , . , —
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X, -
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;
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. ( , -
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, -
). -
:
x(t) xîä (t) xíåîä (t). |
(4.78) |
, (4.77), -
:
xîä 2 xîä 02 xîä 0,
(4.48)
, , -
À0 , (4.55).
-
(4.78)
(4.77). -
, :
xíåîä . Àcos( t ), |
(4.79) |
A , -
m, k, r
f0 .
xíåîä , (4.79),
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x Àsin( t ) , |
x 2 Àcos( t ) (4.80) |
(4.77), :
AB
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