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http://yadda.icm.edu.pl:80/baztech/element/bwmeta1.element.baztech-b350ccd2-645e-490e-9c59-91a257f02ec9

Czasopismo

Archives of Acoustics

Tytuł artykułu

Measurement of Earmuffs Attenuation at High Audible Frequencies

Autorzy Kozłowski, E.  Młyński, R. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
Abstrakty
EN Standardised measurements of sound attenuation of hearing protectors are performed in the frequency range from 125 Hz to 8 kHz. However, noise present at many workplaces contains significant components at higher audible frequency. Therefore, the knowledge about noise attenuation with earmuffs in the audible frequency range above 8 kHz is also necessary for proper hearing protection. The aim of this study was to obtain values of the noise attenuation with 27 commonly-used earmuffs models in the 1/3 octave bands of 10, 12.5 and 16 kHz. The measurements were conducted with a real ear at threshold (REAT) method with participation of subjects. The study showed that attenuation of earmuffs ranged from 24.7 to 42.8 dB, depending on model of earmuffs and frequency band. Furthermore, the measurements were performed with the use of acoustic test fixture which is designed especially for testing hearing protectors. Results obtained with the use of acoustic test fixture indicated that this measurement method can lead to values close to attenuation measured with participation of subjects. On the other hand, values obtained with the use of acoustic test fixture may differ average up to 14 dB from REAT method.
Słowa kluczowe
EN hearing protectors   earmuffs   sound attenuation   high frequencies  
Wydawca Instytut Podstawowych Problemów Techniki PAN
Komitet Akustyki PAN
Polskie Towarzystwo Akustyczne
Czasopismo Archives of Acoustics
Rocznik 2017
Tom Vol. 42, No. 2
Strony 249--254
Opis fizyczny Bibliogr. 14 poz., fot., tab., wykr.
Twórcy
autor Kozłowski, E.
  • Central Institute for Labour Protection – National Research Institute, Czerniakowska 16, 00-701 Warszawa, Poland, emkoz@ciop.pl
autor Młyński, R.
  • Central Institute for Labour Protection – National Research Institute, Czerniakowska 16, 00-701 Warszawa, Poland
Bibliografia
1. ANSI/ASA S12.42-2010, Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures.
2. Berger E. H., Kieper R. W., Stergar M. E. (2012), Performance of New Acoustical Test Fixtures Complying with ANSI S12.42-2010, with Particular Attention to the Specification of Self Insertion Loss, Proceedings of the INTER-NOISE 2012, August 19–22, New York, USA.
3. Crabtree R. B., Behar A. (2000), Measurement of hearing protector insertion loss at ultrasonic frequencies, Applied Acoustics, 59, 3, 287–299.
4. EN ISO 11904-1:2002, Acoustics – Determination of sound immission from sound sources placed close to the ear – Part 1: Technique using a microphone in a real ear (MIRE technique).
5. EN ISO 4869-2:1995, Acoustics – Hearing protectors – Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn.
6. EN ISO 4869-3:2007, Acoustics – Hearing protectors – Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture.
7. EN 24869-1:1992, Acoustics – Hearing protectors. Sound attenuation of hearing protectors – Subjective method of measurement.
8. EN 458:2016, Hearing protectors. Recommendations for selection, use, care and maintenance, Guidance document.
9. Lenzuni P., Sangiorgi T., Cerini L. (2012), Attenuation of peak sound pressure levels of shooting noise by hearing protective earmuffs, Noise Health, 14, 58, 91–99.
10. Młyński R., Kozłowski E., Adamczyk J. (2014), Assessment of impulse noise hazard and the use of hearing protection devices in workplaces where forging hammers are used, Archives of Acoustics, 39, 1, 73–79.
11. Pawlaczyk-Łuszczyńska M., Zaborowski K., Dudarewicz A. (2013), Evaluation of efficiency of personal hearing protective devices in case of exposure to ultrasonic noise. Proceedings of the 16th International Conference on Noise Control 2013, May 26–29, Ryn, Poland.
12. Smagowska B. (2013), Ultrasonic noise sources in a work environment, Archives of Acoustics, 38, 2, 169–176.
13. Smagowska B., Pawlaczyk-Łuszczyńska M. (2013), Effects of ultrasonic noise on the human body – a bibliographic review, International Journal of Occupational Safety and Ergonomics (JOSE), 19, 2, 195–202.
14. Żera J., Młyński R. (2004), Attenuation of outside noise by shotblasting helmets, Archives of Acoustics, 29, 2, 347–358.
Uwagi
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-b350ccd2-645e-490e-9c59-91a257f02ec9
Identyfikatory
DOI 10.1515/aoa-2017-0027