Aniqlangan
qiymati
d2
=
170mm
qabul qilamiz.
b) Yarim ponasim on tasmali uzatm a uchun d i= 9 0 m m b o ‘iganligi
uchun
d2 = 170
mm
.
v)
Ensiz tasmali uzatm a uchun
d 2
= 4 - и ( 1 - £ ) = 6 3 - 1 . 8 7 ( 1 - 0 . 0 1 5 ) = 1 1 6 m m
Aniqlangan q i y m a t , d 2 = 120
mm
qabul
qilamiz
5. Uzatish
sonining hisobiy qiymati
a) N orm al
ponasimon tasm alar uchun
1
d,
90
\u
—
u\
|1.88-1.871
= L i----- I -
100
% = --------------- •
100
=
1
% < [
30
/j
и
1.87
1 J
b) Yarim ponasim on tasm alar uchun
ux = ^ - =
^
= 1.88
Am = 1% <[
3
%] shart bajarildi.
d,
90
v) Ensiz ponasimon tasmalar uchun
d
120
\u* ~ u\
|l .9-1.871
u = ±L =
1^1 = 19
Aw = — -------100% = J------------ ^
100
= 3.0%
x
d{
63
'
и
1.87
6. 0 ‘qlararo
masofaning taxminiy qiymati
a) N orm al ponasim on tasm alar uzatmalar uchun
a
= 0.55(d3 + d2) +
h
mm
bunda: h = 8.7
tasmaning balandligi
a = 0.55(90 + 170) + 87 = 268.7мм
270мм.
b) Y arim ponasim on
tasmalar uzatm alar uchun
a - O.SSCdj. +
d-J + h -
0 .5 5 (9 0 + 1 7 0 ) + 2 .3 5 - 262.35m m * 265mm
h = 2.35mm
v) Ensiz ponasim on tasm alar uzatmalar uchun
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