N
|
S
|
|
n
|
|
|
|
|
|
|
V
|
l
|
250
|
2,21
|
12
|
4
|
25
|
2,6
|
25
|
35
|
42
|
18
|
5,2
|
13
|
1.
|
225
|
2,18
|
13
|
5
|
40
|
3,5
|
22
|
30
|
38
|
16
|
4,6
|
15
|
2.
|
350
|
1,93
|
15
|
2
|
25
|
3,12
|
28
|
35
|
55
|
17
|
5,4
|
10
|
3
|
375
|
1,85
|
10
|
3
|
45
|
2,04
|
29
|
38
|
45
|
12
|
5,6
|
9
|
4
|
380
|
1,82
|
9
|
6
|
55
|
2,05
|
25
|
45
|
55
|
10
|
5,3
|
12
|
5
|
340
|
1,75
|
16
|
4
|
65
|
2,16
|
19
|
27
|
65
|
12
|
4,6
|
10
|
6
|
325
|
1,84
|
17
|
5
|
60
|
2,21
|
28
|
39
|
60
|
18
|
5,2
|
12
|
7
|
305
|
1,65
|
12
|
5
|
70
|
2,18
|
35
|
55
|
70
|
13
|
5,7
|
10
|
8
|
450
|
1,95
|
10
|
6
|
40
|
1,93
|
36
|
52
|
65
|
12
|
5,2
|
12
|
9
|
235
|
2,04
|
12
|
7
|
23
|
2,04
|
37
|
49
|
55
|
13
|
4,6
|
18
|
10
|
265
|
2,05
|
18
|
3
|
26
|
2,05
|
40
|
52
|
75
|
15
|
5,4
|
13
|
11
|
275
|
2,16
|
13
|
4
|
27
|
2,16
|
42
|
58
|
85
|
10
|
5,6
|
12
|
12
|
285
|
2,18
|
12
|
5
|
29
|
2,18
|
28
|
35
|
56
|
9
|
5,3
|
13
|
13
|
315
|
1,85
|
13
|
6
|
30
|
3,35
|
29
|
38
|
68
|
16
|
4,6
|
15
|
14
|
320
|
1,82
|
15
|
3
|
40
|
3,12
|
25
|
45
|
48
|
17
|
5,2
|
10
|
15
|
370
|
1,75
|
10
|
4
|
45
|
2,04
|
19
|
27
|
49
|
12
|
5,7
|
9
|
16
|
380
|
1,84
|
9
|
2
|
55
|
2,05
|
28
|
39
|
52
|
10
|
4,9
|
16
|
17
|
425
|
1,65
|
16
|
5
|
65
|
2,16
|
35
|
55
|
54
|
12
|
5,2
|
17
|
18
|
465
|
1,95
|
17
|
6
|
60
|
2,21
|
36
|
52
|
57
|
18
|
4,6
|
12
|
19
|
485
|
2,04
|
12
|
3
|
70
|
2,18
|
37
|
49
|
42
|
13
|
5,4
|
10
|
20
|
305
|
2,05
|
10
|
4
|
40
|
1,93
|
40
|
52
|
36
|
16
|
5,6
|
12
|
21
|
450
|
2,16
|
12
|
5
|
23
|
2,04
|
42
|
58
|
46
|
17
|
5,3
|
18
|
22
|
235
|
2,18
|
18
|
4
|
26
|
2,05
|
25
|
35
|
32
|
12
|
4,6
|
13
|
23
|
265
|
1,84
|
13
|
3
|
27
|
2,16
|
22
|
30
|
40
|
10
|
5,2
|
16
|
24
|
275
|
1,65
|
16
|
5
|
29
|
2,18
|
28
|
35
|
42
|
12
|
5,7
|
12
|
25
|
285
|
1,95
|
17
|
3
|
30
|
3,35
|
29
|
38
|
38
|
18
|
5,2
|
12
|
26
|
185
|
2,04
|
12
|
3
|
40
|
2,18
|
25
|
45
|
35
|
15
|
4,6
|
10
|
27
|
320
|
2,05
|
10
|
5
|
45
|
3,35
|
19
|
27
|
42
|
19
|
5,4
|
12
|
28
|
370
|
2,16
|
12
|
4
|
40
|
3,12
|
28
|
39
|
39
|
15
|
5,6
|
18
|
29
|
380
|
2,18
|
18
|
6
|
25
|
2,04
|
25
|
35
|
53
|
21
|
5,3
|
15
|
30
|
190
|
1,85
|
15
|
4
|
35
|
2,05
|
32
|
40
|
54
|
22
|
4,6
|
11
|
-
|
|
|
|
|
|
|
|
|
|
|
Вар№
|
Одамлар окимининг зичлиги ,D
|
Эвакуация йуллари-нинг кенглигини
|
эвакуация йуллари-нинг кенглиги
|
Харакат интевсив-лиги
|
Эвакуация давомий-лиги
|
Катор узунлиги
|
Эшиклар кабул килиш давомийлиг вакти
|
Утиш давомийлиги
|
Оким зичлиги
|
Эвакуация маълумотлари
|
Amaliy ish № 8
Ishlab chiqarish joylaridagi tebranishni aniqlash.
Ishdan maqsad: Elektrodvigatel oktan chizig‘ida titrash tezligi chastotalari berilgan. Xar biri va umumiy oktavn chizig‘i uchun titrash chastotasi detsiballarda xisoblansin. Titrash qoplamasini afzalligini xisoblash lozim.
-
Titrash tezligi , m/s-1 ; oktavn chastota chizig‘ida f, Gs
|
markazi
|
16
|
32
|
63
|
125
|
250
|
500
|
1000
|
2000
|
G1=12
|
G2=18
|
G3=45
|
G4=50
|
G5=80
|
G6=41
|
G7=14
|
G8=1,5
|
sex
|
1. Oktavn chizig‘ida titrash tezligini bilgan xolda, titrash tezligini N0 ni aniqlash lozim quydagi formuldan: (dB)
N0 = 201g(g/g0), dB (1)
Bu yerda N0 – titrash tezligi darajasi, dB; g – titrash tezligi, ; g0 — nolinchi qadam, g0 = 5•10-5
N0 1 =201g(12/5•10-5) = 107,60422 dB
N0 2 =201g(18/5•10-5) = 111,12605 dB
N0 3 =201g(45/5•10-5) = 119,08485 dB
N0 4 =201g(50/5•10-5) = 120 dB
N0 5 =201g(80/5•10-5) = 124,0824 dB
N0 6 =201g(41/5•10-5) = 118,27628 dB
N0 7 =201g(14/5•10-5) = 108,94316 dB
N0 8 =201g(1,5/5•10-5) = 89,542425 dB
2. Umumiy titrashni xisoblashda, xar bir darajada titrashni detsiballarda xisoblash:
LU=Ld+DL , dB (2)
Bu yerda: Ld – umumiy xisobiy qiymat, dB;
DL —qо‘shimcha qiymat, aniqlaymiz jadval №2
LU1=89+3=92dB
LU2=102+2,5=104,5, dB
LU3=101+1,8=102,8 ,dB
LU4=100+1,5=101,5 ,dB
LU5=101+1,2=102,2 ,dB
LU6=102+1,0=103 ,dB
LU7=95+0,7=95,7 ,dB
LU8=87+0,6=87,6 ,dB
Jadval 2 –Tovushlarni yig‘indisi
Tovushlar farqi, dB
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
Qо‘shimcha qiymat kattaroq darajaga, dB
|
dL1= 3
|
dL2=
2,5
|
dL3=
1.8
|
dL4=
1,5
|
dL5=
1,2
|
dL6=
1,0
|
dL7=
0,7
|
dL8=
0,6
|
Normativ qiymatlardan titrashni oshib ketish darajasi 3-jadvaldan aniqlanadi. Elektrodvigatel rezonansi chastotasi qaysi oktavn chizig‘ida joylashganligi aniqlash lozim. (bu yerda titrash tezligi katta).
Jadval 3 – Tebranish tezligi qabul qilingan qiymati.
Oktavn chizig‘idagi о‘rtageometrik qiymati, Gs
|
16
|
32
|
63
|
125
|
250
|
500
|
1000
|
2000
|
Tebranish tezligining darajasi
|
Ld1=
89
|
Ld2=
102
|
Ld3=
101
|
Ld4=
100
|
Ld5=
101
|
Ld6=
102
|
Ld7=
95
|
Ld8=
87
| Xisoblash kerak qancha darajaga tebranish chastotasi kamayishini xisoblash lozim, elektrodvigatel ushlagichini titrash chastotasi materiali bilan quyidagi formula orqali aniqlanadi:
DN=201g•(zU+z1/z1) ,dB (3)
Bu yerda DN – tebranishni aniqlik darajasi, dB;
z1- tebranishni tarqalish chastotasi koeffitsiyenti (variant bо‘yicha z1=0,01);
zU – titrash yutumlilik darajasi.
DN=201g•(0.06+0.01/0.01)= 16,901961
4. Titrashni rezonans chastotasini xisoblash N, formula bо‘yicha:
N =N0 - DN, dB (4)
Bu yerda, No — rezonans chastotali darajani ustki qatlamda titrashni aniqlash, dB;
DN — Aniqlilik darajasi , dB.
N1 =107,60422 -16,901961=90,70226
N 2=111,12605-16,901961=94,22409
N 3=119,08485 -16,901961=102,1829
N 4=120-16,901961=103,098
N 5=124,0824 -16,901961=107,1804
N 6=118,27628 -16,901961=101,3743
N 7=108,94316 -16,901961=92,0412
N 8=89,542425 -16,901961=72,64046
5. Xisob natijalarini grafik xolda keltirish lozim.
Уровень колебательной скорости.
|
O’rta geometrik chastotasi, Gts.
-
|
