Document ID (ISN) | 32553 |
CIS number |
79-1901 |
ISSN - Serial title |
0509-6510 - Prace Centralnego instytutu ochrony pracy |
Year |
1979 |
Convention or series no. |
|
Author(s) |
Trynkowska D., Michalski R. |
Title |
Principles for the classification and choice of hearing protectors |
Original title |
Zasady klasyfikacji i doboru ochronników słuchu [in Polish] |
Bibliographic information |
1979, Vol.29, No.101, p.177-189. Illus. 15 ref. |
Abstract |
Results of tests carried out in Poland by the Central Institute for Worker Protection (CIOP) on 22 types of earmuffs, 1 acoustic helmet and 5 types of earplugs. The tests consisted in determining, by the "hearing threshold shift" method, the acoustic efficacy of hearing protectors for 5 standardised noise spectra obtained from mean spectra established for each classified category of noise produced in Polish industrial plants. Analysis of attenuation curves in relation to the spectral distribution index enabled certain laws to be established which were then used as a basis to devise certain simplified methods for the choice and classification of hearing protectors. The selection method reduces workplace noise measurement requirements; only weighted levels LA, in dB(A), and LC, in dB(C) need be measured. The system of classification, based on the protection afforded according to the noise spectrum, comprises 4 categories: A and B for protectors which attenuate all noise, and B and C for those which attenuate only noise with preponderant medium and high frequencies. |
Descriptors (primary) |
hearing protection; earmuffs; earplugs; sound attenuation |
Descriptors (secondary) |
evaluation of equipment; sound frequency; classification; noise measurement; acoustic helmets |
Document type |
- |
Subject(s) |
Noise, hearing and vibration
|
Broad subject area(s) |
|
Browse category(ies) |
Noise Hearing protection
|