«hayot faoliyati xavfsizligi»

IShNI BAJARISh TARTIBI.
1.Vibrografga lenta qo‘ying.
Vibrograf dastasini "viklyucheno" holatga keltiring.
Prujina mexanizmini soat strelkasi bo‘yicha oxirigacha burang.
Vibrostend elektrodvigatelini yurgizing va avtotransformator orqali 300-400 ayl/min tezlikka erishing.
Vibrografni qo‘lingizda ushlab turib sterjenning tashqi uchini stol yuzasiga tekkizing. Asbobni asta bosib peroni lentaning o‘rtasiga keltiring.
Vibrografni yurgizib, shu holatda 2-3 sek ushlab turing.
O‘lchashni tugatib, asbob ichidagi lentani oling. Lupa yordamida ikkilamchi amplituda bo‘lmish A ni lineyka bilan o‘lchang. Yuqorida aytganimizdek vibrogramma amplitudasi olti marta katta qilib yozilganligi uchun, uning haqiqiy qiymati quyidagi formula yordamida topiladi.
, mm (21)
Vibrogrammada tebranishlar chastotasi /f/ ni hisoblang. Buning uchun vibrogrammaning 1-sek oralig‘idagi bir tomonga qaragan tishchalar sonini hisoblab chiqish kerak.
Tebranish davrini hisoblang.
10. O‘lchangan chastota va amplituda qiymatlarini 21-formulaga qo‘yib
tebranma harakat tezligini aniqlang.
11. Olingan qiymatlarni 3-jadvaldagidek, uskunalar uchun titrashning ish joylarida yo‘l qo‘ysa bo‘ladigan qiymatlariga solishtiring.
12. Formula (5) yordamida titrashning tezlanishini aniqlang:
13. Titrashning hisoblab chiqilgan qiymatlariga qarab shu ish stolida ishlash mumkin yoki mumkin emasligi haqida xulosa chiqaring. Qiymatlarni solishtirish uchun quyidagi jadvalni to‘ldiring.


Hisobot

Nazorat savollari.

Titrashni qanday kattaliklar xarakterlaydi?

Amplituda, Chastota, Davr, Tebranma harakat tezligi

Harorat, Atm.bosimi, Dvigatel ning tezligi, amplituda

Vibrograf lentasini tezligi, Chastota, Stolning balandligi, kuchlanish

Nisbiy namlik, Davr, Vaqt, Dvigatel ning tezligi,

Amplituda, vaqt, chastota, namlik, harorat

Chastota, harorat, yoritilgan-lik, Atm. bosimi, namlik,

2. Tebranish amplitudasi qaysi kattaliklarda o‘lchanadi?
Javob: mm, mm/s, %, mm/s2, s/mm2
3. Tebranma harakat tezligi qaysi formuladan aniqlanadi?
Javob: V=2πfAT; V=2πf2A; V=2πfA2; V=2πfA; V=2πf2A2.
4. Ishlab chiqarish uchun zarur bo‘lganda yoki korxona ma’muriyatining ruxsati bilan 18 yoshga to‘lmaganxomilador ayollar va ichak-oshqozon kasalligi bor ishchilar titrashli ishlarda ishlashi mumkinmi?
Javob: mumkin, mumkin emas,vaqtinchamumkin,faqat bir smenaga mumkin.


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LABORATORIYA №6