, ( ) .
, , rb. (.8.1) . :
∪AN = KN; rb ⋅ϕ = rb ⋅ (θ + α),
ΔONK : KN = rb ⋅tgα
α ;
( θ +α)⋅ rb = rb ⋅tgα;
θ = tg(α) −α = inv(α) - (8.1) - ( α) .
.
1) ;
2) ;
3) .
.8.1
:
1 ) , , . : , , , . (. 8.2 ,)
. .
2) .
. , ( ) . , . , (.8.2,).
.8.2
.
, , . . (.8.3) . . :
0; h = 1;
*= 0,25;
= 0,38.
m:
m - , .
ho=h m; hfo=(h + c*)m;
=*m; = m;
|
|
= m; (8.2)
s0 = 0,5p = 0,5 m;
= 0,5 = 0,5 m.
,
, ( .8.3)
.8.3
. r,
.
.8.4.
s ,
h hf, ra rf.. , (8.2). : ra = r+ha,, rf = r-hf, p=s+ e. ,
z: 2 r=zp.
, (8.2),
r = 0,5mz. (8.3)
.
rb. AN . AON = , ( AN ON). AON : rb=rcos . (8.4)
.
, (.8.5). . I . 2 xm, m - , . .8.5 . , < 0. , , = 0.
Vo= r ,
V0 - c , - . , . N , . , PON .
. s ewo . . 8.5: s = ewo= eo+2xmtg ,
s = m(0,5 +2xtg ). (8.5)
e = p - s = m(0,5 -2xtg . (8.6)
: rf = r + xm - (hao+ c),
rf = m(0,5z - h - c*+ x). (8.7)
.8.5
.
I (.8.6), , L 2, . , 3 . . , . , L. (.8.6).
|
|
, L PN. ,
PL PN.
PLQ , PON. PLQ: PL = (hao - xm)/sin ,
PON: PN = rsin .
: 2(h -x) zsin2 .
, :
zmin=2(h -x)/sin2 .
=0 : zmin o =2h /sin2 . (8.8)
zmin o=17.
, :
xmin= h - 0,5z*sin 2 ,
(8.8)
xmin=h (zmin o - z)/zmin o. (8.9)
.8.6
.
, , sa. , . . sa 0,
sa .8.7. , , Aa , , , . , AN AaNa . : , Aa, A Aa.
, AN = MN, rbtg = rb(.
:
: = tg - = inv .
.8.7 ; + .
, s = 2r , sa = 2ray,
sa = ra (8.10)
: (8.11)
.8.7
9