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    Tytuł:
    Analysis of noise sources and selection of ear protector in a coal mine
    Autorzy:
    Erol, Ilknur
    Su, Okan
    Powiązania:
    https://bibliotekanauki.pl/articles/2203335.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kopalnia węgla
    hałas
    dozymetr
    coal mine
    noise
    sound meter
    dosimeter
    hearing protection device
    Opis:
    In this study, the noise sources to which a coal miner, who works at the Kurul panel of Kilimli Colliery, Zonguldak, was exposed were investigated. These sources were positioned at different points from the surface to the workface. Noise levels were measured according to the working periods of the coal miners around the machines. The results were evaluated under the Turkish Noise Regulation. The critical exposure times in which the coal miners could work without the use of personal protective equipment were examined according to the noise values to which they were exposed. In addition, the personal noise exposure values of the machine operators (boring machine, electro-hydraulic drill, and pick hammer) were determined during the development works. Two different types of noise measurements, with a microphone at the ear level and inside the ear protector, were conducted. The results obtained when the microphone of the personal dosimeter was at ear level, were found to be 15 dBA higher than those when the microphone was inside the ear protector. As a result, the selection methods of ear protectors were analyzed. Recommendations were given for those working on the risky tasks at the panel.
    Źródło:
    Archives of Mining Sciences; 2022, 67, 3; 455--476
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accredited Calibration Laboratory for Sound Measurements
    Autorzy:
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114156.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ISO / IEC 17025 standard
    accreditation of calibration laboratory
    calibration of sound level meter
    acoustic calibrator
    band-pass filters
    personal sound exposure meter
    Opis:
    The article presents basic concepts related to accredited calibration laboratories in accordance with ISO/IEC 17025. It describes in detail one of the only few existing in Poland calibration laboratories which deals with instruments for sound measurements. This laboratory is an interesting case as it is the only one in Poland, located in a company developing new instruments, producing, selling them and conducting their service in all over the world. Thanks to this location, the laboratory is able to provide their services not only in Poland but also abroad, which could affect revenues. In the paper laboratory equipment is presented and the innovative ways to increase measurement throughput is discussed. The calibration and measurement capability developed on the basis of uncertainty budgets is given. The activities carried out during the calibration are presented as well as the contents of the first page of the certificate. In the conclusions the strengths of the laboratory are listed.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 8; 250-253
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industrial noise level study in a wheat processing factory in Ilorin, Nigeria
    Autorzy:
    Ibrahim, I.
    Ajao, K. R.
    Aremu, S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/265416.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    poziom szumów
    cyfrowy miernik szumów
    hałas
    wheat processing
    noise level
    digital sound meter
    questionnaire
    hearing protector
    Opis:
    An industrial process such as wheat processing generates significant noise which can cause adverse effects on workers and the general public. This study assessed the noise level at a wheat processing mill in Ilorin, Nigeria. A portable digital sound level meter HD600 manufactured by Extech Inc., USA was used to determine the noise level around various machines, sections and offices in the factory at pre-determined distances. Subjective assessment was also mode using a World Health Organization (WHO) standard questionnaire to obtain information regarding noise ratings, effect of noise on personnel and noise preventive measures. The result of the study shows that the highest noise of 99.4 dBA was recorded at a pressure blower when compared to other machines. WHO Class-4 hearing protector is recommended for workers on the shop floor and room acoustics should be upgraded to absorb some sounds transmitted to offices.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 511-523
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Analysis Using Sound Level Meter to Determine the Period of Usage of the Spindle Bearing of a Radial Drilling Machine
    Autorzy:
    Charles, S.
    Vijaya, Joslin D.
    Powiązania:
    https://bibliotekanauki.pl/articles/176769.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustical condition monitoring
    radial drilling machine
    spindle bearing
    sound level meter
    sound pressure level
    sound muting transducer
    Opis:
    The condition monitoring techniques like acoustic emission, vibration analysis, and infrared thermography, used for the failure diagnosis of bearings, require longer processing time, as they have to per form acoustical measurement followed by signal processing and further analysis using special software. However, for any bearing, its period of usage can be easily determined within an hour, by measuring the bearing sound, using sound level meter (SLM). In this paper the acoustical analysis of the spindle Bering of a radial drilling machine was performed using SLM, by measuring the sound pressure level of the bearing in decibels, for different frequencies, while muting all the other noises. Then using an experimental set up, two database readings were taken, one for new bearing and the other for completely damaged bearing, both are SKF6207, which itself is the spindle bearing. From these three sets of sound pressure level readings, the period of usage of the spindle bearing, was calculated using an interpolation equation, by substituting the life of the bearing from the manufacturer’s catalogue. Therefore, for any machine with a SKF6207 bearing, its usage time can be estimated using the database readings and one measurement on that machine, all with the same speed.
    Źródło:
    Archives of Acoustics; 2019, 44, 3; 505-510
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noise vulnerability mapping using geospatial technique in part of Ibadan north east local government area
    Autorzy:
    Oni, Olukunle O.
    Adetimirin, O. I.
    Ajibade, S. A.
    Kolade, K. R.
    Ilesanmi, O. I.
    Akinluyi, F. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189960.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Digital Sound Level Meter (DSLM)
    Inverse Distance Weighted (IDW)
    Mean Noise Level
    Noise Level Point
    and Sound Level for Morning
    Afternoon and Evening (Lm_a_e)
    Opis:
    Human activity is main source of all environmental pollutions. Noise is common environmental issuesthat cannot be generated without geospatial location. It has great impact on mankind such as physical disturbance, physiological disturbance and affects human health. The aim of this research work is to identify the geospatial noise level and mapping noise vulnerability in some part of Ibadan North East Local Government Area. DSLM and GPS are used for survey method in which sixteen different location points were selected for noise vulnerability. The Mathematical Model is used to calculate Equivalent continuous sound level for morning, afternoon and evening (Lm_a_e), mean noise level for the morning, afternoon, evening and Daily Average of Noise values were generated. World Health Organization (WHO) recommendation standard was used as a standard in this research because Nigeria Noise pollution bill is still under consideration in the National Assembly. ArcGIS software was used for analysis and noise zones were carved out based on WHO yardsticks. Noise vulnerability mapping generated shown that land uses within the study area were experiencing very higher noise levels which are risky to the environment and society. Environmental agency and Government should set standard values for the noise barriers by passing the noise bill in the National Assembly assiduously and soonest.
    Źródło:
    World Scientific News; 2016, 52; 143-161
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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