Muhandislik uchun bepul vosita
Shovqinga ta'sir kalkulyatori
EU 2003/10/EC Direktivasi va OSHA standartlariga muvofiq ruxsat etilgan shovqin ta'siri vaqti va dozasini hisoblang. Ranglar bo'yicha xavf baholash uchun shovqin darajasi va ta'sir davomiyligini kiriting.
Results
Ruxsat etilgan ta'sir vaqti
Ruxsat etilgan ta'sir vaqti shovqin darajasi, etalon daraja va almashinuv koeffitsienti asosida hisoblanadi:
Noise Dose
Ruxsat etilgan chegaraning foizi sifatida shovqin dozasi:
Vaqt bo'yicha o'rtacha qiymat (TWA)
8 soatlik ekvivalent shovqin darajasi:
Where:
- L — o'lchangan shovqin darajasi (dBA)
- Lref — etalon daraja: 85 dBA (EU) yoki 90 dBA (OSHA)
- ER — almashinuv koeffitsienti: 3 dB (EU) yoki 5 dB (OSHA)
- t — haqiqiy ta'sir vaqti (soatlarda)
- Tpermitted — maksimal ruxsat etilgan ta'sir vaqti (soatlarda)
Amaliy Misol
T = 8 / 2(92−85)/3 = 8 / 22.333 = 8 / 5.04 = 1.59 hours
Dose = (6 / 1.59) × 100% = 378%
TWA = 92 + 10 × log₁₀(6/8) = 92 − 1.25 = 90.8 dBA
Xavf: Doza 378% > 200% → Xavfli — zudlik bilan chora ko'rish talab etiladi
⚠️ Note: Maximum permissible time at 92 dBA is only 1 hour 35 minutes under EU standard. Immediate noise reduction measures and hearing protection are mandatory.
Keng tarqalgan manbalarning shovqin darajalari
| Source | Odatdagi daraja (dBA) | Ruxsat etilgan vaqt (EU) | Ruxsat etilgan vaqt (OSHA) |
|---|---|---|---|
| Oddiy suhbat | 60 | Unlimited | Unlimited |
| Vacuum cleaner | 70 | Unlimited | Unlimited |
| Zich transport / Ochiq ofis | 80 | 25.4 hours | Unlimited |
| Factory floor | 85 | 8.00 hours | Unlimited |
| Hand drill | 90 | 2.52 hours | 8.00 hours |
| Silliqlash / Elektr arra | 95 | 0.79 hours | 4.00 hours |
| Circular saw | 100 | 0.25 hours | 2.00 hours |
| Bolg'ali tegirmon / Perçinlash | 105 | 4.7 min | 1.00 hour |
| Jackhammer | 110 | 1.5 min | 30 min |
| Reaktiv dvigatel (30 m masofada) | 140 | ≈ 0.09 sec | ≈ 28 sec |
All times are computed from the calculator formula T = 8 / 2(L−Lref)/ER (EU: Lref = 85 dBA, ER = 3 dB; OSHA: Lref = 90 dBA, ER = 5 dB) and apply to steady, continuous equivalent A-weighted levels (LAeq) only. Peak and impulse noise is assessed separately — EU Directive 2003/10/EC sets a peak exposure limit of 140 dB(C) (LCpeak) regardless of duration — and hearing-protector attenuation must be derated for real-world fit before crediting it against these exposures.
Shovqin darajasiga ko'ra ruxsat etilgan ta'sir vaqti
| Shovqin darajasi (dBA) | EU (3 dB almashuv koeffitsienti) | OSHA (5 dB almashinuv koeffitsienti) |
|---|---|---|
| 85 | 8 h 00 min | —* |
| 88 | 4 h 00 min | —* |
| 90 | 2 h 31 min | 8 h 00 min |
| 91 | 2 h 00 min | 6 h 58 min |
| 94 | 1 h 00 min | 4 h 36 min |
| 95 | 47 min | 4 h 00 min |
| 97 | 30 min | 3 h 02 min |
| 100 | 15 min | 2 h 00 min |
| 103 | 7 min 30 sec | 1 h 19 min |
| 106 | 3 min 45 sec | 52 min |
| 109 | 1 min 53 sec | 34 min |
| 112 | 56 sec | 22 min |
| 115 | 28 sec | 15 min |
* OSHA mos yozuvlar darajasi — 90 dBA; 90 dBA dan past darajalar uchun OSHA vaqt cheklovlari mavjud emas (8 soat ishlashda PEL oshirilmaydi).
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