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    Wyświetlanie 1-9 z 9
    Tytuł:
    Measurement of Earmuffs Attenuation at High Audible Frequencies
    Autorzy:
    Kozłowski, E.
    Młyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/176861.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hearing protectors
    earmuffs
    sound attenuation
    high frequencies
    Opis:
    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.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 249-254
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of recognition of the direction from which an industrial truck auditory danger signal was coming
    Autorzy:
    Młyński, R.
    Kozłowski, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/114105.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    auditory danger signal
    directivity of hearing
    localization
    industrial trucks
    Opis:
    The goal of the study was to assess the manner in which the direction of an industrial truck auditory danger signal is perceived in the presence of noise. A particular element of the study was the reconstruction in the laboratory of actual workplace conditions using acoustic signals recorded in the working environment, taking into account the wearing of hearing protectors. The constructed experimental set-up is described (Fig. 1, Fig. 2). A percentage of correctly determined directions was established, for workplace conditions (Fig. 4) and after reducing the ambient noise (Fig. 5). Recognition of the direction from which the sound is coming is the most difficult when the truck is directly behind the person (20% of correct answers) and in front of the person (up to 30% of correct answers). Correct recognition of the direction is much easier (80–98% of the cases), when the sound originates from the side. Lowering the ambient noise level resulted in better recognition of the direction from which sounds played in the front of the person came.
    Źródło:
    Measurement Automation Monitoring; 2017, 63, 1; 6-9
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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 earmuffs used simultaneously with safety spectacles in exposure to impulse noise
    Badania eksperymentalne tłumienia nauszników przeciwhałasowych stosowanych łącznie z okularami ochronnymi w warunkach występowania hałasu impulsowego
    Autorzy:
    Kozłowski, E.
    Młyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/210323.pdf
    Data publikacji:
    2018
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    acoustics
    noise protection
    impulse noise
    hearing protectors
    earmuffs
    noise attenuation
    akustyka
    ochrona przed hałasem
    hałas impulsowy
    ochronniki słuchu
    nauszniki przeciwhałasowe
    tłumienie hałasu
    Opis:
    Impulse noise is particularly hazardous to the hearing of exposed individuals. In many real-life scenarios, the only protective measure used to reduce the level of impulse noise is hearing protectors. These scenarios include firing ranges. Aside from hearing protectors, shooters use personal safety spectacles. The purpose of this paper was to determine the effect of the simultaneous use of earmuffs and safety spectacles on the sound attenuation of earmuffs during exposure to impact noise. The research was completed with the MIRE method and included the determination of sound attenuation changes in five different models of earmuffs, used simultaneously with three different models of safety spectacles and prescription glasses. The impulse noise source used was a starting pistol, which generated C-weighted peak sound pressure level at a mean of 136.7 dB. The tests demonstrated that the simultaneous use of safety spectacles and earmuffs reduces the impulse noise attenuation of the earmuffs by up to 9 dB. Such sound attenuation changes occurred during simultaneous use of earmuffs with safety spectacles, which feature temples with a rectangular cross-section. The tests also demonstrated that the effect of prescription glasses on sound attenuation was unusually high; prescription glasses reduced the impulse sound attenuation of earmuffs by as much as 18 dB.
    Hałas impulsowy jest szczególnie niebezpieczny dla słuchu osób na niego eksponowanych. W wielu sytuacjach jedynym środkiem ograniczania hałasu impulsowego są ochronniki słuchu. Taka sytuacja występuje na przykład na strzelnicach. Poza ochronnikami słuchu strzelcy również często korzystają z indywidualnych ochron oczu. Celem przedstawionych badań było określenie jak jednoczesne stosowanie nauszników przeciwhałasowych i okularów wpływa na zmianę tłumienia nauszników w sytuacji występowania hałasu impulsowego. Badania zostały przeprowadzone z wykorzystaniem metody MIRE i obejmowały wyznaczenie zmian tłumienia dźwięku pięciu modeli nauszników przeciwhałasowych stosowanych jednocześnie z trzema modelami okularów ochronnych oraz okularami korekcyjnymi. Źródłem hałasu impulsowego był pistolet startowy, który generował dźwięk o szczytowym poziomie dźwięku C wynoszącym średnio 136,7 dB. Przeprowadzone badania wykazały, że jednoczesne używanie okularów ochronnych i nauszników obniża tłumienie hałasu impulsowego wnoszone przez nauszniki maksymalnie do 9 dB. Takie zmiany występowały podczas jednoczesnego stosowania nauszników i okularów charakteryzujących się zausznikami o prostokątnym przekroju. Badania także wykazały wyjątkowo duży wpływ okularów korekcyjnych na tłumienie nauszników, które spowodowały pogorszenie tłumienia hałasu impulsowego wnoszonego przez nauszniki nawet o 18 dB.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2018, 67, 1; 43-52
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Acoustic Treatment on Music Teachers’ Exposure to Sound
    Autorzy:
    Kozłowski, E.
    Młyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/177728.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    music teachers
    sound pressure level
    acoustic treatment
    Opis:
    In this study, music teachers’ exposure to sound was tested by measuring the A-weighted equivalent sound pressure level (SPL), the A-weighted maximum SPL and the C-weighted peak SPL. Measurements were taken prior to and after acoustic treatment in four rooms during classes of trumpet, saxophone, French horn, trombone and percussion instruments. Results showed that acoustic treatment affects the exposure of music teachers to sound. Daily noise exposure levels (LEX, 8 h) for all teachers exceeded a limit of 85 dB while teaching music lessons prior to room treatment. It was found that the LEX, 8 h values ranged from 85.8 to 91.6 dB. The highest A-weighted maximum SPL and C-weighted peak SPL that music teachers were exposed to were observed with percussion instruments (LAmax = 110.4 dB and LCpeak = 138.0 dB). After the treatments, daily noise exposure level decreased by an average of 5.8, 3.2, 3.0, 4.2 and 4.5 dB, respectively, for the classes of trumpet, saxophone, French horn, trombone and drums, and did not exceed 85 dB in any case.
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 159-163
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Impulse Noise Hazard and the Use of Hearing Protection Devices in Workplaces where Forging Hammers are Used
    Autorzy:
    Młyński, R.
    Kozłowski, E.
    Adamczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/176721.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impulse noise
    noise attenuation
    hearing protection device
    die forging hammer
    Opis:
    The impulse noise is agent harmful to health not only in the case of shots from firearms and the explosions of explosive materials. This kind of noise is also present in many workplaces in the industry. The paper presents the results of noise parameters measurements in workplaces where four different die forging hammers were used. The measured values of the C-weighted peak sound pressure level, the A-weighted maximum sound pressure level and A-weighted noise exposure level normalized to an 8 h working day (daily noise exposure level) exceeded the exposure limit values. For example, the highest measured value of the C-weighted peak sound pressure level was 148.9 dB. In this study possibility of the protection of hearing with the use of earplugs or earmuffs was assessed. The measurement method for the measurements of noise parameters under hearing protection devices using an acoustical test fixture instead of testing with the participation of subjects was used. The results of these measurements allows for assessment which of two tested earplugs and two tested earmuffs sufficiently protect hearing of workers in workplaces where forging hammers are used.
    Źródło:
    Archives of Acoustics; 2014, 39, 1; 73-79
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    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
    Tytuł:
    Evaluation of Exposure to Impulse Noise at Personnel Occupied Areas During Military Field Exercises
    Autorzy:
    Młyński, R.
    Kozłowski, E.
    Usowski, J.
    Jurkiewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177458.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impulse noise
    noise exposure
    hearing damage risk criteria
    weapon
    Opis:
    The tests reported in this paper were carried out to evaluate the exposure of soldiers to noise at operator and control positions during military field exercises. The tests were conducted during firing from a T-72 tank, a BWP-1 Infantry Fighting Vehicle, antitank guided missiles, a ZU-23-2K anti-aircraft gun, and a 2S1 GOZDZIK howitzer. The evaluation of noise exposure showed that the limit values of sound pressure level, referred to by both Polish occupational noise protection standards and the Pfander and Dancer hearing damage risk criteria developed for military applications, were repeatedly exceeded at the tested positions. Despite of the use of tank crew headgear, the exposure limit values of sound pressure level were exceeded for the crew members of the T-72 tank, the BWP-1 infantry fighting vehicle, and the 2S1 GOZDZIK howitzer. The results show that exposure of soldiers to noise during military field exercises is a potentially high hearing risk factor.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 197-205
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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