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Wyszukujesz frazę "Młyński, R." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Determining Attenuation of Impulse Noise With an Electrical Equivalent of a Hearing Protection Device
Autorzy:
Młyński, R.
Kozłowski, E.
Powiązania:
https://bibliotekanauki.pl/articles/91027.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
impulse noise
noise attenuation
hearing protectors
transfer function of hearing protection device
hałas impulsowy
ochrona słuchu
ochrona przed hałasem
środki ochrony indywidualnej
tłumienie hałasu
Opis:
Determining the effectiveness of impulse noise attenuation with hearing protection devices (HPDs) is an important part of their selection. Measuring impulse noise parameters under an HPD would involve exposing subjects to impulses with a high peak sound pressure level. This paper presents a computational method of determining impulse noise parameters under the cups of earmuffs. Calculations are done using the transfer function of earmuffs, determined with Shaw's electrical equivalent of an HPD, taking into account the design parameters of earmuffs. The developed method was used for calculations in the presence of impulse noise generated by gunshots. To verify the computational method, the results of these calculations were compared with the results of measurements.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 127-141
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attenuation of Noise by Motorcycle Safety Helmets
Autorzy:
Młyński, R.
Kozłowski, E.
Żera, J.
Powiązania:
https://bibliotekanauki.pl/articles/89964.pdf
Data publikacji:
2009
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
noise attenuation
measurements on subjects
motorcycle helmets
motorcyclist conditions of work
Opis:
For workers such as police motorcyclists or couriers, traffic and engine noise reaching the ears is an important factor contributing to the overall condition of their work. This noise can be reduced with motorcycle helmets. In this study, insertion loss of motorcycle helmets was measured with the microphone-in-real-ear technique and sound attenuation with the real-ear-at-threshold method. Results for 3 Nolan helmets show essentially no protection against external noise in the frequency range <250 Hz. In the frequency range >500 Hz, attenuation increases linearly at a rate of 8–9 dB per octave, to ~30 dB at 8 kHz. Lack of attenuation in the low-frequency range may cause annoying effects. In addition, high attenuation in the high-frequency range may decrease intelligibility of speech signals for a rider in a helmet. Attenuation measured in this study does not take into account noise generated by turbulent wind around the helmet. Thus, the measured values of attenuation represent a motorcycle rider’s best conditions of hearing.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2009, 15, 3; 287-293
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Musician’s Earplugs on Sound Level and Spectrum During Musical Performances
Autorzy:
Kozłowski, E.
Żera, J.
Młyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/90990.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
earplugs
hearing protection
noise
sound pressure level
musicians
Opis:
In this study, change in A-weighted and 1/3-octave sound pressure levels (SPLs) was used to assess the influence of wearing earplugs by musicians on their musical performances. Seven soloists and 3 music assembles performed 4 pieces of music with musician’s earplugs donned and doffed. They used silicon custom moulded earplugs with acoustic filters designed to attenuate sound by 9, 15 or 25 dB. Results showed that the use of earplugs affected the sound level and the spectrum of played sounds. This effect was the greatest for brass players. The difference between SPLs in high-frequency 1/3-octave bands and A-weighted SPLs with and without earplugs exceeded 5 and 15 dB, respectively. Similar changes for woodwind, percussion and string instruments were less noticeable than for brass instruments; they were more than 5 dB for 1/3-octave spectra and no more than 2 dB for A-weighted SPL.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 3; 249-254
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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