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    Wyświetlanie 1-11 z 11
    Tytuł:
    3D Acoustic Field Intensity Probe Design and Measurements
    Autorzy:
    Kotus, J.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/176807.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound intensity
    acoustic vector sensor
    calibration
    measurements
    Opis:
    The aim of this paper is two-fold. First, some basic notions on acoustic field intensity and its measurement are shortly recalled. Then, the equipment and the measurement procedure used in the sound intensity in the performed research study are described. The second goal is to present details of the design of the engineered 3D intensity probe, as well as the algorithms developed and applied for that purpose. Results of the intensity probe measurements along with the calibration procedure are then contained and discussed. Comparison between the engineered and the reference commercial probe confirms that the designed construction is applicable to the sound field intensity measurements with a sufficient effectiveness.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 701-711
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creating Acoustic Maps Employing Supercomputing Cluster
    Autorzy:
    Czyżewski, A.
    Kotus, J.
    Szczodrak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177400.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise pollution
    acoustic noise monitoring
    noise propagation model
    supercomputing
    acoustic maps
    Opis:
    The implemented online urban noise pollution monitoring system is presented with regard to its conceptual assumptions and technical realization. A concept of the noise source parameters dynamic assessment is introduced. The idea of noise modeling, based on noise emission characteristics and emission simulations, was developed and practically utilized in the system. Furthermore, the working system architecture and the data acquisition scheme are described. The method for increasing the speed of noise map calculation employing a supercomputer is explained. The practical implementation of noise maps generation and visualization system is presented, together with introduced improvements in the domain of continuous noise monitoring and acoustic maps creation. Some results of tests performed using the system prototype are shown. The main focus is put on assessing the efficiency of the acoustic maps created with the discussed system, in comparison to results obtained with traditional methods.
    Źródło:
    Archives of Acoustics; 2011, 36, 2; 395-418
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Vector Sensors to Acoustic Surveillance of a Public Interior Space
    Autorzy:
    Łopatka, K.
    Kotus, J.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176963.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound localization
    acoustic vector sensors
    acoustic events
    Opis:
    A method for precise sound sources detection and localization in interiors is presented. Acoustic vector sensors, which provide multichannel output signals of acoustic pressure and particle velocity were employed. Methods for detecting acoustic events are introduced. The algorithm for localizing sound events in the audience is presented. The system set up in a lecture hall, which serves as a demonstrator of the proposed technology, is described. The accurracy of the proposed method is evaluated by the described measurement results. The analysis of the results is followed by conclusions pertaining the usability of the proposed system. The concept of the multimodal audio-visual detection of events in the audience is also introduced.
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 851-860
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distrubuted system for noise threat evaluation based on psychoacoustic measurements
    Autorzy:
    Kotus, J.
    Szczodrak, M.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/220609.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise
    environmental noise
    dosimetry
    measurements
    Opis:
    An innovative system designed for the continuous monitoring of acoustic climate of urban areas was presented in the paper. The assessment of environmental threats is performed using online data, acquired through a grid of engineered monitoring stations collecting comprehensive information about the acoustic climate of urban areas. The grid of proposed devices provides valuable data for the purpose of long and short time acoustic climate analysis. Dynamic estimation of noise source parameters and real measurement results of emission data are utilized to create dynamic noise maps accessible to the general public. This operation is performed through the noise source prediction employing a propagation model being optimized for computer cluster implementation requirements. It enables the system to generate noise maps in a reasonable time and to publish regularly map updates in the Internet. Moreover, the functionality of the system was extended with new techniques for assessing noise-induced harmful effects on the human hearing system. The principle of operation of the dosimeter is based on a modified psychoacoustic model of hearing and on the results of research performed with participation of volunteers concerning the impact of noise on hearing. The primary function of the dosimeter is to estimate, in real time, auditory effects which are caused by exposure to noise. The results of measurements and simulations performed by the system prototype are depicted and analyzed. Several cases of long-term and short-term measurements of noise originating from various sources were considered in detail. The presented outcomes of predicted degree of the hearing threshold shift induced during the noise exposure can increase the awareness of harmfulness of excessive sound levels.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 219-230
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of a noise mapping tool deployed in grid infrastructure for creating noise maps of Urban areas
    Autorzy:
    Szczodrak, M.
    Kotus, J.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/305743.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    noise map
    noise modeling
    grid computing
    noise
    Opis:
    The concept and implementation of the system for creating dynamic noise maps in PL-Grid infrastructure are presented. The methodology of dynamic acoustical map screating is introduced. The concept of noise mapping, based on noise source and propagation models, was developed and employed in the system. The details of incorporation of the system to the PL-Grid infrastructure are presented. The results of simulations performed by the system prototype are depicted. The results in the form of noise maps obtained by a system are compared with some other solutions in order to investigate accuracy.
    Źródło:
    Computer Science; 2013, 14 (2); 231-242
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar rozkładu wektora natężenia dźwięku w pobliżu dyfuzora akustycznego weryfikowany symulacją komputerową
    Numerical simulation of the sound intensity distribution in the proximity of the acoustic diffuser
    Autorzy:
    Kurowski, A.
    Kotus, J.
    Kostek, B.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/267168.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    dyfuzor akustyczny
    akustyka pomieszczeń
    wektor natężenia akustycznego
    metoda elementów brzegowych
    acoustic diffuser
    room acoustics
    sound intensity vector
    boundary element method
    Opis:
    Projektowanie adaptacji akustycznej pomieszczeń jest złożonym procesem, który wymaga możliwości przewidywania wpływu zastosowanych ustrojów akustycznych na sposób propagacji fal akustycznym w pomieszczeniu. Przykładem ustroju stosowanego do korekcji akustyki pomieszczeń jest dyfuzor akustyczny. Niniejsza praca opisuje proces pomiaru oraz numerycznej symulacji rozkładu wektora natężenia dźwięku w pobliżu dyfuzora. Analiza tego rozkładu pozwala zaobserwować zjawisko transportu energii akustycznej w pobliżu badanego obiektu. Wyniki badań przedstawiono w formie graficznej. Przygotowane zostały także mapy różnic pomiędzy rozkładem wektora natężenia dźwięku zmierzonego bez i z dyfuzorem. Jako obiekt referencyjny wykorzystana została płaska powierzchnia odbijająca. Dzięki takiemu podejściu możliwe było zaobserwowanie i opisanie wpływu zjawiska rozproszenia dźwięku przez dyfuzor na rozkład otaczającego pola akustycznego.
    Acoustic treatment of rooms is a complex task which is often connected with simulation of the impact of used acoustic systems on the propagation of sound waves in the place of interest. An example of such sound system is the acoustic diffuser. In this work, we present a process of the measurement and numerical simulation of the sound intensity vector distribution in the proximity of the acoustic diffuser. This distribution may provide useful information related to the phenomena of energy transport in the sound field surrounding the diffuser. Results of the measurement and simulation are visualized in the form of grayscale maps of the sound intensity vector absolute value and arrows denoting its direction and sense. There are three types of measured sound field: one without any obstacle in front of the sound source, one with the diffuser placed in front of the source and the last one with the smooth reflecting plate in front of the source. The second and the third scenarios are used as references for the first measurement. Such an approach allowed the calculation of the map of differences between the acoustic field with the obstacle and without the obstacle in front of the sound source and a better visualization of the impact of those acoustic devices on the sound field.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 51; 97-101
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long-Term Comparative Evaluation of Acoustic Climate in Selected Schools Before and After Acoustic Treatment
    Autorzy:
    Kotus, J.
    Szczodrak, M.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177966.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise measurement
    acoustic climate evaluation
    acoustic treatment
    noise dose
    Opis:
    The results of long-term continuous noise measurements in two selected schools are presented in the paper. Noise characteristics were measured continuously there for approximately 16 months. Measurements started eight months prior to the acoustic treatment of the school corridors of both schools. An evaluation of the acoustic climates in both schools, before and after the acoustic treatment, was performed based on comparison of these two periods of continuous measurements. The autonomous noise monitoring stations, engineered at the Multimedia Systems Department of the Gdansk University of Technology were used for this purpose. Investigations of measured noise, especially its influence on hearing sense, assessed on ground of spectral analyses in critical bands, is discussed. Effects of occupational noise exposure, including the Temporary Threshold Shift simulation, are determined. The correlation of the above said measurement results with respective instantaneous noise levels is discussed, and concluding remarks are presented. Some additional indicators such as air pollution or video analysis aiming at the analysis of corridor occupancy are also measured. It should be remembered that excessive noise, or air pollution may be evidence of a dangerous event and may pose health risks.
    Źródło:
    Archives of Acoustics; 2010, 35, 4; 551-564
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creating Dynamic Maps of Noise Threat Using PL-Grid Infrastructure
    Autorzy:
    Szczodrak, M.
    Kotus, J.
    Kostek, B.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177988.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise
    dynamic noise map
    reverse engineering
    grid computing
    Opis:
    The paper presents functionality and operation results of a system for creating dynamic maps of acoustic noise employing the PL-Grid infrastructure extended with a distributed sensor network. The work presented provides a demonstration of the services being prepared within the PLGrid Plus project for measuring, modeling and rendering data related to noise level distribution in city agglomerations. Specific computational environments, the so-called domain grids, are developed in the mentioned project. For particular domain grids, specialized IT solutions are prepared, i.e. software implementation and hardware (infrastructure adaptation), dedicated for particular researcher groups demands, including acoustics (the domain grid “Acoustics”). The infrastructure and the software developed can be utilized mainly for research and education purposes, however it can also help in urban planning. The engineered software is intended for creating maps of noise threat for road, railways and industrial sources. Integration of the software services with the distributed sensor network enables automatic updating noise maps for a specific time period. The unique feature of the developed software is a possibility of evaluating auditory effects which are caused by the exposure to excessive noise. The estimation of auditory effects is based on calculated noise levels in a given exposure period. The outcomes of this research study are presented in a form of the cumulative noise dose and the characteristics of the temporary threshold shift.
    Źródło:
    Archives of Acoustics; 2013, 38, 2; 235-242
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multimedialny System Monitorowania Hałasu
    Multimedia Noise Monitoring System
    Autorzy:
    Czyżewski, A.
    Kotus, J.
    Kostek, B.
    Szczodrak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/180743.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    hałas
    zagrożenie hałasem
    system monitorowania hałasu
    pomiary hałasu
    psychoakustyczny dozymetr hałasu
    noise
    noise pollution
    noise monitoring system
    noise measurements
    psychoacoustic noise dosimetry
    Opis:
    W artykule przedstawiono Multimedialny System Monitorowania Hałasu. Projekt jest sieciocentrycznym systemem dedykowanym monitorowaniu zagrożeń hałasem. Jego nadrzędnym celem jest zwiększenie skuteczności w zakresie profilaktyki chorób słuchu. Umożliwia pobieranie, gromadzenie, analizę i wizualizację danych dotyczących hałasu, pobieranych ze zdalnych urządzeń pomiarowych oraz elektronicznych ankiet dostępnych przez Internet. Ponadto w artykule przedstawiono autorską koncepcję psychoakustycznego dozymetru hałasowego. Dozymetr ten umożliwia wyznaczenie czasowego przesunięcia progu słyszenia podczas trwania ekspozycji na hałas. Możliwe jest dzięki temu ciągłe monitorowanie progu słyszenia osób przebywających w warunkach szkodliwego oddziaływania hałasu.
    A concept and an implementation of a multimedia computer system for monitoring environmental noise threats is presented. The principal aim of the project was to improve the effectiveness of prophylaxis of hearing diseases. The system makes it possible to receive, store, analyze and visualize noise data coming from noise measurement equipment and from electronic questionnaires accessible through the Internet. Moreover a new concept of psychoacoustic noise dosimetry is also presented. The designed noise dosimeter can assess temporary threshold shift (TTS) during noise exposure. In this way it is possible to monitor the hearing threshold shift continuously for people exposed to harmful noise.
    Źródło:
    Bezpieczeństwo Pracy : nauka i praktyka; 2007, 7/8; 8-11
    0137-7043
    Pojawia się w:
    Bezpieczeństwo Pracy : nauka i praktyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A System for Acoustic Field Measurement Employing Cartesian Robot
    Autorzy:
    Szczodrak, M.
    Kurowski, A.
    Kotus, J.
    Czyżewski, A.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/221435.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cartesian robot
    sound intensity
    sound field
    anechoic chamber
    Opis:
    A system setup for measurements of acoustic field, together with the results of 3D visualisations of acoustic energy flow are presented in the paper. Spatial sampling of the field is performed by a Cartesian robot. Automatization of the measurement process is achieved with the use of a specialized control system. The method is based on measuring the sound pressure (scalar) and particle velocity(vector) quantities. The aim of the system is to collect data with a high precision and repeatability. The system is employed for measurements of acoustic energy flow in the proximity of an artificial head in an anechoic chamber. In the measurement setup an algorithm for generation of the probe movement path is included. The algorithm finds the optimum path of the robot movement, taking into account a given 3D object shape present in the measurement space. The results are presented for two cases, first without any obstacle and the other - with an artificial head in the sound field.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 333-343
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems of Railway Noise—A Case Study
    Autorzy:
    Szwarc, M.
    Kostek, B.
    Kotus, J.
    Szczodrak, M.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/91183.pdf
    Data publikacji:
    2011
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    rail traffic noise
    national government legislation and regulations
    European Community requirements
    noise-generating devices
    rolling contact noise sources
    rail vehicle noise
    Opis:
    Under Directive 2002/49/EC relating to the assessment and management of environmental noise, all European countries are obliged to model their environmental noise levels in heavily populated areas. Some countries have their own national method, to predict noise but most have not created one yet. The recommendation for countries that do not have their own model is to use an interim method. The Dutch SRM II scheme is suggested for railways. In addition to the Dutch model, this paper describes and discusses 3 other national methods. Moreover, discrepancies between the HARMONOISE and IMAGINE projects are analysed. The results of rail traffic noise measurements are compared with national methods.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2011, 17, 3; 309-325
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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