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    Wyświetlanie 1-11 z 11
    Tytuł:
    Design and effectiveness verification of sound reduction measures in production hall
    Autorzy:
    Moravec, M.
    Liptai, P.
    Dzuro, T.
    Badida, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/103293.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    sound insulating measures
    sound analysis
    sound measurements
    design
    Opis:
    The main aim of the work described in this paper was to design and validate measures to reduce noise levels in a training center. This training center serves for the practical training of students with the focus in the shaping and machining engineering products. Reduction of noise in the training center was mainly due to the clarity and hearing of the spoken word between the lecturer and students, as well as to reduce the risk of hearing damage. In order to reduce noise levels, it was proposed to overlap the training center with a roof structure filled with sound absorbing material in two solutions. The noise absorption coefficient of the selected material was determined on the impedance tube. For verification of effectiveness, measurements of equivalent A sound levels were made before and after realization noise reduction measures. Reduction of equivalent A sound pressure levels after the noise reduction measures are between 15.5 dB and 17.5 dB depending on the measuring point and the operating mode. The effectiveness of the implemented measures reaches a good level, as noise was reduced to the recommended legislative level.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 220-224
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Testowanie dźwięku w smartfonach w warunkach domowych
    Smartphones Sound Testing in Home Setting
    Autorzy:
    Ozimek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/98074.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Lubelska. Instytut Informatyki
    Tematy:
    smartfony
    pomiar dźwięku
    dźwięk
    smartphones
    audio measurements
    sound
    Opis:
    W artykule opisano testy, przeprowadzone na trzech modelach smartfonów: Galaxy S6, iPhone 6S i Lumia 950. Testy miały na celu wybranie modelu, który najlepiej sobie radzi z przetwarzaniem dźwięku. Badania odbyły się w warunkach domowych, przy użyciu stosunkowo prostego sprzętu. W pracy opisano sposób przeprowadzenia testów, a następnie omówiono wnioski, decydując, który ma najlepsze parametry, jeśli o przetwarzanie dźwięku.
    Quality of sound is one of the most important factors while choosing the perfect smartphone model. This article concerns about domestic sound testing of smartphones. Both ways of examining and the equipment used for it are discussed. These tests have been performed on popular models of smarphones: Galaxy S6, iPhone 6S and Lumia 950 to collect recent data and to achieve the essential aim: establishing the fact which model is the best in terms of sound processing.
    Źródło:
    Journal of Computer Sciences Institute; 2016, 2; 70-75
    2544-0764
    Pojawia się w:
    Journal of Computer Sciences Institute
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of Acoustic Impedance for Surfaces Delimiting the Volume of an Enclosed Space
    Autorzy:
    Piechowicz, J.
    Czajka, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/177215.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic impedance
    acoustic measurements
    numerical methods
    sound field
    Opis:
    Several methods can be applied for analyses of the acoustic field in enclosed rooms namely: wave propagation, geometrical or statistical analysis. The paper presents problems related to application of the boundary elements method to modelling of acoustic field parameters. Experimental and numerical studies have been combined for evaluation of acoustic impedance of the material used for the walls of a model room. The experimental studies have been carried out by implementing a multichannel measuring system inside the constructed model of an industrial room. The measuring system allowed simultaneous measurements of the source parameters – the loudspeaker membrane vibration speed, the acoustic pressure values in reception points located inside the model space as well as phase shifts between signals registered in various reception points. The numerical modelling making use of the acoustic pressure values measured inside the analyzed space allowed determination of requested parameters of the surface at the space boundary.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 97-102
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified pressure-pressure sound intensity measurement method and its application to loudspeaker set directivity assessment
    Autorzy:
    Mickiewicz, Witold
    Raczyński, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/220959.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound intensity
    pressure-pressure intensity probe
    loudspeaker set measurements
    Opis:
    Sound intensity measurements using special sensors in a form of pressure-velocity and pressure-pressure probes are becoming more and more often the method of choice for characterization of sound sources. Its wider usability is blocked by the probes’ costs. This paper is on a possible modification of the well-known pressure-pressure sound intensity measurement method. In the proposed new approach a synchronized measurement procedure using only single microphone is used. The paper presents the basics of the sound intensity theory, a review of currently used methods of intensity measurement and requirements and limitations of the new method. In the proposed approach one microphone and a properly designed positioning system is used. The application of the method to study the directional characteristics of an active loudspeaker system have been described in detail. The obtained results were compared with those of measurements performed with a commercial p-u probe. The paper contains conclusions indicating advantages of the applied method in comparison with standard pressure measurement methods.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 1; 181-194
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Error Analysis of Sound Source Directivity Interpolation Based on Spherical Harmonics
    Autorzy:
    Szwajcowski, Adam
    Krause, Daniel
    Snakowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1953503.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sound source directivity
    spherical harmonics
    interpolation error
    sparse measurements
    Opis:
    Precise measurement of the sound source directivity not only requires special equipment, but also is time-consuming. Alternatively, one can reduce the number of measurement points and apply spatial interpolation to retrieve a high-resolution approximation of directivity function. This paper discusses the interpolation error for different algorithms with emphasis on the one based on spherical harmonics. The analysis is performed on raw directivity data for two loudspeaker systems. The directivity was measured using sampling schemes of different densities and point distributions (equiangular and equiareal). Then, the results were interpolated and compared with these obtained on the standard 5° regular grid. The application of the spherical harmonic approximation to sparse measurement data yields a mean error of less than 1 dB with the number of measurement points being reduced by 89%. The impact of the sparse grid type on the retrieval error is also discussed. The presented results facilitate optimal sampling grid choice for low-resolution directivity measurements.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 95-104
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of the sound insulating measures for a vibrational sorter and verification of the measured effectiveness
    Autorzy:
    Liptai, P.
    Moravec, M.
    Lumnitzer, E.
    Gergeľová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/102093.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    sound insulating measures
    vibrational sorter
    noise visualization
    analysis and measurements
    Opis:
    The paper describes a specific design of the sound insulating enclosure of a vibrating sorter. Recycling aspects have been taken into account when designing the enclosure, because recycled foam has been applied as a sound-absorbing material. An acoustic camera was used to measure, analyze, evaluate and to localise and identify sound sources. The visualization method was used to locate the critical locations of the device and then quantify them. To evaluate the effectiveness of the proposed enclosure, the measurements of the sound parameters were performed before and after the realization soundproofing measure. The measured results show the requested efficiency of the sound insulating enclosure in terms of noise reduction as well as dust near the sorter.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 196-203
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and Designing Acoustical Conditions of the Interior – Case Study
    Autorzy:
    Kostek, B.
    Laskowski, S.
    Mizgier, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/176652.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic field analysis
    acoustic field modeling
    acoustic conditions measurements
    acoustic conditions analysis
    sound reinforcement system design
    Opis:
    The primary aim of this research study was to model acoustic conditions of the Courtyard of the Gdańsk University of Technology Main Building, and then to design a sound reinforcement system for this interior. First, results of measurements of the parameters of the acoustic field are presented. Then, the comparison between measured and predicted values using the ODEON program is shown. Collected data indicate a long reverberation time which results in poor speech intelligibility. Then, a thorough analysis is perform to improve the acoustic properties of the model of the interior investigated. On the basis of the improved acoustic model two options of a sound reinforcement system for this interior are proposed, and then analyzed. After applying sound absorbing material it was noted that the predicted speech intelligibility increased from bad/poor rating to good category.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 473-484
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of acoustic propagation of automotive cooler during run up and run down
    Analiza propagacji akustycznej chłodnicy samochodowej w czasie rozbiegu i wybiegu
    Autorzy:
    Paluch, Wojciech
    Kłaczyński, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1955229.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    automotive
    electric vehicle
    noise
    interior noise
    vibroacoustics
    sound intensity
    measurements
    motoryzacja
    hałas
    pojazd elektryczny
    hałas wewnętrzny
    wibroakustyka
    natężenie dźwięku
    pomiar
    Opis:
    The modern automotive industry invests more and more in electric drive technology. As a result, new challenges arise in terms of vibroacoustic optimization of the car interior. Components that were once masked by the internal combustion engine are starting to dominate the interior of vehicles. There is therefore a great need for noise reduction. For this purpose, a number of methods of its reduction are used, i.e. component optimization (source), use of active noise reduction systems or passive soundproofing materials. In order to perform the abovementioned noise reduction measures, appropriate measurements and signal analysis should be carried out. This presentation aims to present the measurement of an automotive air cooler in transient states on the stand. Measurements were made using a 3D intensity probe based on the direct measurement of the acoustic particle velocity, in 3 planes in front of the cooler. Then, order tracking analysis was performed for the run-up and coast-down. The results in the form of selected orders of intensity and acoustic particle velocity were compared with classical results made with the use of a microphone at the same measurement points locations.
    Współczesny przemysł motoryzacyjny inwestuje coraz bardziej w technologię napędu elektrycznego. W związku z tym pojawiają się nowe wyzwania w zakresie optymalizacji wibroakustycznej wnętrza samochodu. Komponenty, które kiedyś były maskowane przez silnik spalinowy zaczynają dominować we wnętrzu pojazdów. Istnieje zatem duża potrzeba redukcji hałasu. W tym celu stosuje się szereg metod jego redukcji, tj. optymalizacja komponentu (źródła) zastosowanie aktywnych systemów redukcji hałasu lub pasywnych materiałów wygłuszających. Aby dokonać wspomnianych zabiegów redukujących hałas, należy przeprowadzić stosowne pomiary oraz analizę sygnałów. Niniejsza prezentacja ma na celu przedstawienie pomiaru chłodnicy samochodowej w stanach nieustalonych na stanowisku. Pomiarów dokonano przy użyciu sondy natężeniowej 3D bazującej na bezpośrednim pomiarze prędkości akustycznej cząsteczek, w 3 płaszczyznach przed chłodnicą. Następnie wykonano analizę rzędów (order tracking) dla rozbiegu oraz wybiegu. Wyniki w formie wybranych rzędów (orderów) natężeń oraz prędkości akustycznej cząstek zestawiono z klasycznymi wynikami wykonanymi przy użyciu mikrofonu w tych samych punktach pomiarowych.
    Źródło:
    Diagnostyka; 2021, 22, 4; 3-8
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microphone Based Acoustic Vector Sensor for Direction Finding with Bias Removal
    Autorzy:
    Wajid, Mohd
    Kumar, Arun
    Bahl, Rajendar
    Powiązania:
    https://bibliotekanauki.pl/articles/2141636.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic measurements
    acoustic sensor
    acoustic vector sensor
    direction-of-arrival estimation
    finite element analysis
    microphones
    particle velocity
    sound source localization
    Opis:
    The acoustic vector sensor (AVS) is used to measure the acoustic intensity, which gives the direction-of-arrival (DOA) of an acoustic source. However, while estimating the DOA from the measured acoustic intensity the finite microphone separation (d) in a practical AVS causes angular bias. Also, in the presence of noise there exists a trade off between the bias (strictly increasing function of d) and variance (strictly decreasing function of d) of the DOA estimate. In this paper, we propose a novel method for mitigating the angular bias caused due to finite microphone separation in an AVS. We have reduced the variance by increasing the microphone separation and then removed the bias with the proposed bias model. Our approach employs the finite element method (FEM) and curves fitting to model the angular bias in terms of microphone separations and frequency of a narrowband signal. Further, the bias correction algorithm based on the intensity spectrum has been proposed to improve the DOA estimation accuracy of a broadband signal. Simulation results demonstrate that the proposed bias correction scheme significantly reduces the angular bias and improves the root mean square angular error (RMSAE) in the presence of noise. Experiments have been performed in an acoustic full anechoic room to corroborate the effect of microphone separation on DOA estimation and the efficacy of the bias correction method.
    Źródło:
    Archives of Acoustics; 2022, 47, 2; 151-167
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the sound power level of modular machines with cyclic operation mode - case study
    Autorzy:
    Jakubek, Bartosz
    Barczewski, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/2146627.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    sound power level
    in situ measurements
    survey method
    tray former
    forming machine
    poziom mocy akustycznej
    pomiary in situ
    metoda ankietowa
    formierka tac
    maszyna do formowania
    Opis:
    The sound power level as a parameter characterizing a sound source, as opposed to the sound pressure level, should theoretically not depend on the place of measurement and distance from the source. Therefore, it is often used as a basis for comparing machines and equipment in terms of noise emissions. Manufacturers usually specify this parameter in the technical documentation or on the equipment. The sound power level is also a necessary parameter for modelling the natural and working environment in terms of acoustics. The standards for methods of determining the sound power level define three classes of accuracy depending on the method and environment of measurement. The paper outlines the problems associated with determining the sound power level of non-standard machines in situ. The case study concerns a machine, a modular SRP (shelf ready packaging) production system that can be part of an extensive production line. Specific for this type of machine is the coexistence of many local sources generating sound of different nature, cyclic mode of operation and the possibility to set different capacity.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020101
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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