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Wyświetlanie 1-15 z 26
Tytuł:
Diagnostic Symptoms of Corona Audible Noise in Continuous Monitoring Systems
Autorzy:
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/177366.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corona audible noise
power lines
continuous monitoring systems
noise indicators
statistical levels
Opis:
Random nature of corona processes in UHV power lines and the accompanying noise is the reason that in practice the best determination of acoustic parameters, necessary for the noise evaluation, is obtained from the continuous monitoring procedure. However because of considerable fluctuations (both the useful signal part and the interfering components), careful selection of monitored parameters is necessary to enable a possibility of automatic determination of the parameters that are required for long-term evaluation of corona noise. In the present work a practical realization is shown for estimation of corona noise parameters, based on the data obtained from continuous monitoring stations, making use of the statistical spectra measurement and characteristic features of corona process acoustic signal. Selected results are presented from continuous monitoring of corona noise generated at a 400 kV power line, with special attention focused on definitions of the measured quantities, which enable automatic estimation of the basic factors required for noise evaluation. Accompanying monitoring of environmental conditions, including humidity, precipitation intensity and fog density, that are well correlated with the corona process intensity, which might definitely increase the filtration efficiency of environmental disturbances and on the other hand, it enables verification of calculation methods applied to corona noise. The paper also contains a description of practical approach to selection signal parameters of corona noise in continuous monitoring stations.
Źródło:
Archives of Acoustics; 2011, 36, 1; 151-160
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cumulative Industrial Noise Impact on the Environment
Autorzy:
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/178090.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
industrial noise
cumulative impact
noise indicators
cumulative noise levels
Opis:
The paper presents basic legal conditions, applicable to the calculation of cumulative noise levels in the environment with indication mainly on lack of detailed regulations both in formal and methodological approach for evaluating those levels. The paper is focused on methodological approach with the emphasis on analysis of existing case studies in the industry. The main subject of the analysis is the cumulation of industrial noise sources: newly designed and existing ones, together with a proposal of accumulate other types of the noise. Evaluation of cumulative noise levels for new (designed) objects is realised by computational methods, and for existing objects, by measurements or by combination of measurement and computational methods. It is assumed that the cumulative level is an energetic sum of the rating levels for all installations and it will not exceed the limit value in a given place. For the cumulation of different noise sources, the weighting for criterion values of these sources will be applied in aggregation.
Źródło:
Archives of Acoustics; 2017, 42, 2; 169-174
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Qualification methods for assessment of annoyance of impulsive sounds
Metody kwalifikacji dźwięków impulsowych pod względem oceny ich uciążliwości
Autorzy:
Kukulski, B.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/368971.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
impulsive noise
impulsive adjustment
noise annoyance
hałas impulsowy
korekcja impulsowa
uciążliwość hałasu
Opis:
This paper presents the work on the problem of the qualification of impulsive sounds for applying the adequate value of impulsive adjustment. Impulsive events must be included in the assessment of noise in Poland. There is no agreement for using the objective methods that could qualify impulsive sounds on the basis of the measurable physical characteristics of the impulses. Moreover, the arbitrary classification includes only a few specified sources. The paper presents a review of the methods and criteńa for the qualification of the impulses and provides the results of applying these methods on a certain impulsive noise source - the collision of train cars.
W artykule zaprezentowano problem kwalifikacji dźwięków impulsowych w aspekcie wyznaczenia odpowiedniej wartości poprawki impulsowej. Uwzględnianie zjawisk impulsowych w ocenie hałasu środowiskowego jest w Polsce obowiązkowe. Jednakże nie ma jednej obiektywnej metody kwalifikacji impulsów na podstawie ich mierzalnych cech fizycznych. Co więcej, stosowane arbitralne metody obejmują jedynie kilka przypadków. W artykule dokonano przeglądu obowiązujących metod i kryteriów kwalifikacji dźwięków impulsowych, a także dokonano weryfikacji tych metod na przykładzie wybranego dźwięku impulsowego - zderzeń wagonów.
Źródło:
Mechanics and Control; 2014, 33, 3; 67-74
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Changes in Position of Sound Source and Microphone on Acoustic Measurements in Small Rooms. A Case Study
Autorzy:
Mleczko, D.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1359909.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.Dk
43.50.Jh
43.55.Ka
43.58 Ta
43.55.-n
43.55.+p
Opis:
Results of computer simulations and measurements in real interior for varying location of sound source and microphone are shown in the paper. A small room with a volume of 47 $m^3$ was used for this purpose. The objective of measurements and calculations was to determine the sound pressure level and other parameters derived from the room impulse response ($T_{30}$, EDT, $C_{80}$, STI) followed by the sensitivity analysis of those parameters to changing the location and orientation of the sound source and the receiver. In order to determine these parameters, the room impulse response was measured using MLS method. Experimental studies have been used to verify the acoustic room model built with use of enhanced radial method algorithms and its sensitivity. That allowed complementary and extended simulation studies on the room acoustic characteristics and finally determination of sensitivity of output parameters to changes of location and orientation of the measurement channel elements.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-131-A-134
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial Intelligence and Learning Systems Methods in Supporting Long-Term Acoustic Climate Monitoring
Autorzy:
Kłaczyński, M.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1400078.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.60.Lq
07.05.Mh
Opis:
Developing effective methods for automatic identification of noise sources is currently one of the most important tasks in long-term acoustical climate monitoring of the environment. Manual verification of recorded data, when it comes to proper determination of noise levels, is time-consuming and costly. A possible solution is to use pattern recognition techniques for acoustic signal recorded by a monitoring station. This paper presents usefulness of special directed measurement techniques, acoustic signal processing, and classification methods using artificial intelligence (the Sammon mapping) and learning systems methods (Support Vector Machines) in the recognition of corona audible noise from ultra-high voltage AC transmission lines.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1024-1028
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy of Assessing the Level of Impulse Sound From Distant Sources
Autorzy:
Wszołek, T.
Kłaczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/89989.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
impulse sound
noise measurement
long-term average immission level
Opis:
Impulse sound events are characterised by ultra high pressures and low frequencies. Lower frequency sounds are generally less attenuated over a given distance in the atmosphere than higher frequencies. Thus, impulse sounds can be heard over greater distances and will be more affected by the environment. To calculate a longterm average immission level it is necessary to apply weighting factors like the probability of the occurrence of each weather condition during the relevant time period. This means that when measuring impulse noise at a long distance it is necessary to follow environmental parameters in many points along the way sound travels and also to have a database of sound transfer functions in the long term. The paper analyses the uncertainty of immission measurement results of impulse sound from cladding and destroying explosive materials. The influence of environmental conditions on the way sound travels is the focus of this paper.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2007, 13, 4; 433-440
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic Detection of Long-Term Audible Noise Indices from Corona Phenomena on UHV AC Power Lines
Autorzy:
Wszołek, T.
Kłaczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1197542.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.60.Lq
07.05.Mh
Opis:
One of the most important tasks in outdoor acoustic monitoring stations is automatic extraction of the measured signal parameters. In case of corona discharge noise from ultra-high voltage alternating current (UHV AC) power lines it is necessary to select properly the corona audible noise (CAN) parameters to be monitored for noise indicators calculation, as the monitored signal and the background noise strongly fluctuate. A combined selection of distinctive features of CAN is necessary in order to distinguish the actual signal from the external interference. The vast amount of recorded data is difficult to store and process. Therefore, particular attention was devoted to define of the collected parameters used for automatic calculation of the CAN long-term noise indicators. In addition, several new CAN parameters were introduced, including spectral moments, spectral coefficients of tonal components contribution, and power coefficients in selected frequency bands; as it allowed more efficient selection of samples with non-zero contribution from CAN. The artificial neural network was applied for final classification of the measured samples. Selected and properly filtered samples provided the basis for calculations of long-term noise indicators. Efficiency of the said method was tested for the measurement sections with the recorded sound signal and aural qualification of the CAN intensity.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-93-A-98
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability Influence of Input Parameters οn Result of Room Acoustic Calculation
Autorzy:
Mleczko, D.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1537528.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.Dk
43.50.Jh
43.55.Ka
Opis:
For a long time there is a need in industry of acoustical modeling of rooms. Modeling is necessary for new production room design, the exchange of existing machinery, modernization or expansion of production rooms, changes in production profile or acoustical room adaptation for acoustical work conditions improvement. in such cases modeling quality is essential and thanks to uncertainty analysis it is possible to quantitatively estimate the effect that input parameters value variation has on model behavior. The article presents general rules for sound pressure level prediction uncertainty calculation in a room. By partial uncertainty calculation analysis of input parameters influence on uncertainty prediction an effort was taken to find parameters with biggest influence on the prediction process. As an example an industrial production room is presented which was modeled to predict noise level on a work stands after it was expanded.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 128-130
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection and Classification of Selected Noise Sources in Long-Term Acoustic Climate Monitoring
Autorzy:
Kłaczyński, M.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1490331.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.60.Lq
84.35.+i
43.55.Ka
Opis:
Continuous acoustical climate monitoring of the environment raises several problems related to large quantities of the recorded data, which often represents information unrelated to the studied noise source. Manual verification of such data is time-consuming and costly. Therefore, developing effective methods for automatic identification of transport noise sources becomes an important task for the proper determination of noise levels. This paper presents a concept of such method of automatic detection and classification of the noise sources from the air and railway transportation in the acoustic environmental monitoring.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-179-A-182
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Research on Impulsive Events in Railway Noise Generated During Passage Through a Railroad Switch
Autorzy:
Kukulski, B.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/176326.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impulsive noise
railway noise measurements
impulsiveness
Opis:
This paper presents the result of research on the impulsive components of a railway noise generated during passage through a railroad switch compared with a typical rail noise and evaluation of this phenomenon with particular emphasis on impulsive sounds. The study includes the analysis of the source of impulsive components in the railway noise, the methodology of measurement and data analysis. Spectral analysis of typical fragments passing through a railroad switch is given together with a proposal of additional indicators to assess the noise. Authors propose three descriptors of the impulsive noise such as spectral centroid, kurtosis and impulsiveness, and show that these descriptors can be useful in assessment of the impulsive noise generated during trains’ crossing.
Źródło:
Archives of Acoustics; 2017, 42, 3; 441-447
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Study of REpower MM92 Wind Turbines During Exploitation
Autorzy:
Kłaczyński, M.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/177881.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind turbine noise
low frequency noise
airfoil self noise
measurements assessment
Opis:
The paper presents the current state of knowledge concerning the sources of noise generated by wind turbines, force measurement methodology, and assessment of noise onerousness in this type of installation, on the basis of a study concerning a wind farm with five REpower MM92 wind turbines and the electric power of 2 MW and the sound power level of 104.2 dB(A) each. Particular attention was focused on the often discussed problem of presence of infrasound generated by turbines and on the requirements of the applicable reference methodologies for the measurement of wind speed to 5 m/s, while the turbine reaches its full power at speeds above 10 m/s.
Źródło:
Archives of Acoustics; 2014, 39, 1; 3-10
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Fireworks Noise on the Acoustic Climate in Urban Areas
Autorzy:
Kukulski, B.
Wszołek, T.
Mleczko, D.
Powiązania:
https://bibliotekanauki.pl/articles/176479.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impulsive noise
fireworks
environmental noise
Opis:
New Year’s Eve is an example of a situation in which urban residents are exposed to an almost continuous and increased noise level from the impulsive sounds sources – fireworks. This custom has become a source of many controversies related to the protection of human and animal health or environmental pollution. However, current legal regulations only slightly affect the subject of noise of fireworks and its harmfulness. Currently, it does not seem possible to completely prohibit the use of fireworks in urban areas, but this does not mean that it is not possible to decrease the degree of their annoyance. The paper consists the issues of identification, analysis and assessment of impulsive noise of fireworks and acoustic climate during New Year’s Eve. Material presented refers to measurements of time series, frequency spectrum and values of noise parameters of selected fireworks. It was presented, among others, that the measured values exceed the criteria for occupational noise (LCpeak), due to the direct hazard of hearing loss, from 1.8 dB at a distance of 25 m and 6.2 dB at a distance of 15 m. Also this work discusses results of impulsive noise measurements of fireworks recorded during New Year’s Eve in years 2016-2017. Material refers to measurements at three measurement points spread over the city of Kraków. Obtained results were compared with typical noise levels for night time in urban area, indicating also the main sources of annoyance and hazard from this type of noise.
Źródło:
Archives of Acoustics; 2018, 43, 4; 697-705
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roczne rozkłady wartości dobowych poziomu hałasu w środowisku w wybranych punktach pomiarowych
The daily environmental noise level descriptors distribution analysis at chosen in measurement points
Autorzy:
Kujawa-Łobaczewska, H.
Maciejczyk, J.
Wszołek, T.
Powiązania:
https://bibliotekanauki.pl/articles/180168.pdf
Data publikacji:
2016
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
wskaźnik LDWN
monitoring hałasu komunikacyjnego
hałas komunikacyjny
day evening night sound level
LDEN level
community noise equivalent level
CNEL
traffic noise
community noise monitoring
Opis:
W pracy zaprezentowano analizę rozkładu wartości wyników pomiarów i wskaźników zagrożeń hałasowych środowiska w wybranych długookresowych przedziałach czasowych. Wyniki i wnioski z tej analizy posłużą w następnych etapach badań do opracowania procedury pozwalającej na poprawny wybór lokalizacji punktu pomiarowego oraz okresu wykonywania pomiarów, zapewniający odpowiednio dokładne obliczenia wskaźnika LDWN na podstawie niekompletnego zestawu danych, nie obejmującego wszystkich dni w roku. Rezultaty obliczeń przedstawiono na bazie wyników ciągłego monitoringu hałasu drogowego prowadzonego w 4 punktach w głównych miastach województwa kujawsko pomorskiego, t.j. Bydgoszczy, Toruniu, Włocławku i Grudziądzu.
The analysis of distribution of traffic noise measurements results performed with in the longtime chosen periods and calculated noise level descriptors are presented in the paper. Results and conclusions of the analysis will be used in next steps of there researches for developing a procedure which should allow to choose a measurement point localization and a measurement s period. The procedure should assure proper calculation of LDEN noise level descriptor for an incomplete set of measurements days. The calculations are made on basis of long period traffic noise monitoring results. The monitor mg was conducted in 4 points in the main towns of kujawsko-pomorskie voivodeship: Bydgoszcz, Toruń, Włocławek and Grudziądz The calculations result are presented.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2016, 9; 20-23
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Certain Problems Concerning Environmental Impact Assessment of Wind Turbines in Scope of Acoustic Effects
Autorzy:
Wszołek, T.
Kłaczyński, M.
Mleczko, D.
Ozga, A.
Powiązania:
https://bibliotekanauki.pl/articles/1197516.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.58.+z
43.66.Lj
87.50.Y-
Opis:
The paper deals with difficulties that are encountered by investors and decision-making authorities in the course of investment processes involving construction of wind power plants. Moreover, attention is focused on absence of standardized procedures that could be used to determine environmental impact of wind turbines, mainly in the scope of acoustic effects appearing in conditions typical for operation of such devices (strong wind), high elevation of related noise sources, and the nature of the sound emission (tonality and amplitude modulation). Lack of such procedures is a source of serious ambiguities developing in assessment of all investment stages - planning and forecasting, construction, and operation. An additional problem arises in the case of power plants located in the vicinity of Natura 2000 area, where construction projects are often obstructed on the grounds of unclear criteria concerning, among other things, the effect of acoustic phenomena on birds, bats, and other animals. It follows from the research presented in this paper that the consistent system of procedures and criteria should be worked out on the grounds of long-term monitoring studies.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-38-A-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integration of rail vehicle devices into one module in order to increase passenger safety and comfort
Autorzy:
Hejczyk, T.
Wszołek, B.
Gałuszka, A.
Powiązania:
https://bibliotekanauki.pl/articles/393623.pdf
Data publikacji:
2014
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
passenger railway traffic
safety
collision detection module
fire alarm module
rail
crossing monitoring
ultrasonic method
radar
pasażerski ruch kolejowy
bezpieczeństwo
moduł wykrywania kolizji
moduł alarmu pożarowego
kolej
monitoring skrzyżowania
metoda ultradźwiękowa
Opis:
This paper presents an overview of collision and other threats (like e.g. rail crossing accidents) detection methods in railway passenger traffic. This overview leads to concept of Integrated System of Supporting Information Management in Passenger Traffic (the polish acronym of the system is ZSIKRP Demonstrator+). Currently on the polish and, as far as we know, international market such integrated solution is not developed and proposed. In this concept the final customer, e.g. the manufacturer or carrier company, will install one complete solution instead of multiple different installations that are usually difficult or even impossible to integrate. In our opinion the integration leads to increase in safety level of public transport and to improvement the quality of services offered. The novelty of the system is to provide collision, threats detection and fire alarm system integrated into a single coherent solution
Źródło:
Archives of Transport System Telematics; 2014, 7, 2; 45-50
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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