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(77) (78):
( ) ( )
( )
dt
rtrrr
rr
tfru
2
0
2
0
22
0
cos22
1
;
+−−
−
=
∫
−
ϕπ
ϕ
π
π
(79)
. ,
( )
−ϕf
,
( ) ( )
ϕϕ fru →;
,
0
rr →
.
( )
ϕ;ru
.
–
, .
,
:
HzzRrRr ==== ,0,,
21
:
( ) ( )
( ) ( )
,0
;;
,0
0;;
;;,;;
2211
=
∂
∂
=
∂
∂
==
z
Hru
z
ru
uzRuuzRu
ϕϕ
ϕϕ
(80)
−
21
,uu
.
5.
.
.
0
2
2
2
2
2
2
=
∂
∂
+
∂
∂
+
∂
∂
z
u
y
u
x
u
O
H
1
R
2
R
X
Y
D
Z
(77) (78): π r02 − r 2 u (r; ϕ ) = ∫−π f (t ) r02 − 2r0 r cos(t − ϕ ) + r 2 dt 1 (79) 2π . , f (ϕ ) − , u (r ; ϕ ) → f (ϕ ) , r → r0 . u (r ; ϕ ) . – , . , : r = R1 , r = R2 , z = 0, z = H : u (R1 ; ϕ ; z ) = u1 , u (R2 ; ϕ ; z ) = u 2 ∂u (r ; ϕ ;0) ∂u (r ; ϕ ; H ) (80) = 0, = 0, ∂z ∂z u1 ,u 2 − . Z H O R1 D Y R2 X 5. . . ∂ 2u ∂ 2u ∂ 2u + + =0 ∂ x2 ∂ y2 ∂ z2