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    Wyświetlanie 1-7 z 7
    Tytuł:
    Experimental Acoustic Flow Analysis Inside a Section of an Acoustic Waveguide
    Autorzy:
    Weyna, S.
    Mickiewicz, W.
    Pyła, M.
    Jabłoński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178109.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound intensity
    laser anemometry
    acoustics flow
    sound visualization
    Opis:
    Noise propagation within ducts is of practical concern in many areas of industrial processes where a fluid has to be transported in piping systems. The paper presents experimental data and visualization of flow in the vicinity of an abrupt change in cross-section of a circular duct and on obstacles inside where the acoustic wave generates nonlinear separated flow and vortex fields. For noise produced by flow wave of low Mach number, laminar and turbulent flows are studied us- ing experimental sound intensity (SI) and laser particle image velocimetry (PIV) technique adopted to acoustics (A-PIV). The emphasis is put on the development and application of these methods for better understanding of noise generation inside the acoustic ducts with different cross-sections. The intensity distribution inside duct is produced by the action of the sum of modal pressures on the sum of modal particle velocities. However, acoustic field is extremely complicated because pressures in non-propagating (cut-off) modes cooperate with particle velocities in propagating modes, and vice versa. The discrete frequency sound is strongly influenced by the transmission of higher order modes in the duct. By under- standing the mechanism of energy in the sound channels and pipes we can find the best solution to noise abatement technology. In the paper, numerous methods of visualization illustrate the vortex flow as an acoustic velocity or sound intensity stream which can be presented graphically. Diffraction and scattering phenomena occurring inside and around the open-end of the acoustic duct are shown.
    Źródło:
    Archives of Acoustics; 2013, 38, 2; 211-216
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obrazowanie akustyczne - zalety i możliwości zastosowania w zwalczaniu zagrożenia hałasem
    Sound visualization - advantages and applications in fighting the hazard of noise
    Autorzy:
    Morzyński, Leszek
    Swidziński, Adam
    Štramberský, Radek
    Pavaluca, Paula
    Powiązania:
    https://bibliotekanauki.pl/articles/2202837.pdf
    Data publikacji:
    2021
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    hałas
    obrazowanie akustyczne
    wizualizacja dźwięku
    kamera akustyczna
    noise
    sound visualization
    acoustic camera
    beamforming
    Opis:
    Identyfikacja źródeł hałasu jest jednym z istotnych elementów procesu ograniczania tego zagrożenia w środowisku pracy. Umożliwia wskazanie dominującego źródła hałasu oraz ułatwia dobór rozwiązań i środków technicznych mających na celu jego ograniczanie. Identyfikacja źródeł hałasu z zastosowaniem tradycyjnych technik pomiarowych i przyrządów pomiarowych z pojedynczym mikrofonem czy sonda natężeniowa jest czasochłonne, a w wielu przypadkach bardzo trudne. Odwzorowanie parametrów pola akustycznego w postaci graficznej znakomicie ułatwia proces lokalizacji źródeł energii akustycznej oraz dróg jej propagacji. Obrazowanie akustyczne, inaczej wizualizacja dźwięku, jest graficzną formą prezentacji zjawisk akustycznych, w której parametry emitowanego hałasu przedstawiane są w postaci barwnej mapy nałożonej na obraz jego źródła. W artykule omówiono jedną z podstawowych technik obrazowania akustycznego, jaką jest beam forming, oraz urządzenia do obrazowania akustycznego z zastosowaniem tej techniki, czyli kamery akustyczne. Na przykładach wyników badań laboratoryjnych i w warunkach rzeczywistych przedstawiono zalety i możliwości wykorzystania tej techniki oraz jej ograniczenia.
    Identification of noise sources is one of the important elements of the process of reducing noise hazards in the work environment. It enables the indication of the dominant noise source and facilitates the selection of solutions and technical measures aimed at reducing it. Identifying noise sources using traditional measurement techniques and measuring instruments with a single microphone or intensity probe is time consuming and in many cases very difficult. Graphical mapping of acoustic field parameters greatly facilitates the process of locating sources of acoustic energy and its propagation paths. Sound visualization, is a graphic form of presentation of acoustic phenomena, in which the parameters of the emitted noise are presented in the form of a color map superimposed on the image of its source. The article discusses one of the basic techniques of acoustic imaging, which is beam forming, and acoustic imaging devices using this technique, i.e. acoustic cameras. The advantages and possibilities of using this technique, as well as its limitations, are discussed on the basis of measurement results carried out in laboratory and in real conditions.
    Źródło:
    Bezpieczeństwo Pracy : nauka i praktyka; 2021, 12; 18-23
    0137-7043
    Pojawia się w:
    Bezpieczeństwo Pracy : nauka i praktyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conveyor Failure Diagnostics using Sound Visualization Technique
    Autorzy:
    Moravec, M.
    Badida, Miroslav
    Jamborova, Miroslava
    Badidova, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/102541.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    sound visualization methods
    maintenance
    failure analysis
    conveyor system
    metody wizualizacji dźwięku
    konserwacja
    analiza awarii
    przenośniki taśmowe
    Opis:
    Sound visualization methods and techniques are currently applied in various fields to identify and locate individual sources of noise. Conveyor systems are used in various industrial plants. Conveyors require regular inspection and maintenance. In some operations, conveyor systems are difficult to access for the maintenance purposes. During their operation, conveyor systems contribute to increasing the noise levels. The increased noise emitted by a conveyor may signal the failure of a certain part of the system. Such failures can be identified by a sound visualization device and contribute to an effective maintenance of conveyor systems. The paper analyzes specific conveyor systems and identified potential failures of these conveyor systems by using sound visualization methods.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 4; 144-150
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and Classification of Noise Sources of Conveyor Systems by Sound Visualizing on the Postal Package Sorting Line
    Autorzy:
    Liptai, Pavol
    Lumnitzer, Ervín
    Moravec, Marek
    Piňosová, Miriama
    Powiązania:
    https://bibliotekanauki.pl/articles/103009.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    noise sources
    sound visualization
    noise location
    conveyor system
    źródła hałasu
    wizualizacja dźwięku
    lokalizacja hałasu
    przenośniki taśmowe
    Opis:
    Sound visualization tools are now widely used in industry. As a tool, acoustic cameras are also well- suited for faster identification of errors as well as individual states while operating devices. The aim of this paper was to locate and quantify noise sources on a packet sorting line using an acoustic camera and then to propose noise reduction measures. Localization of noise sources was performed by means of an acoustic camera with a microphone ring array. The result of these measurements and analyses was to sort the individual noise sources from less noisy to the noisiest, which gives a good assumption for better planning of spending on the implementation of noise reduction measures. The outputs of these measurements also give information on the character and frequency composition of the sound of individual sources, which will help out in the design of specific noise measures.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 4; 172-176
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Particle Image Velocimetry and Proper Orthogonal Decomposition Applied to Aerodynamic Sound Source Region Visualization in Organ Flue Pipe
    Autorzy:
    Mickiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177661.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Aeroacoustics
    POD
    PIV
    organ flue pipe
    sound field
    visualization
    Opis:
    The paper presents experimental results of the visualization of the nonlinear aeroacoustic sound generation phenomena occurring in organ flue pipe. The phase-locked particle image velocimetry technique is applied to visualize the mixed velocity field in the transparent organ flue pipe model made from Plexiglas. Presented measurements were done using synchronization to the tone generated by the pipe itself supplied by controlled air flow with seeding particles. The time series of raw velocity field distribution images show nonlinear sound generation mechanisms: the large amplitude of deflection of the mean flue jet and vortex shedding in the region of pipe mouth. Proper Orthogonal Decomposition (POD) was then applied to the experimental data to separately visualize the mean mass flow, pulsating jet mass flow with vortices and also sound waves near the generation region as well as inside and outside of the pipe. The resulting POD spatial and temporal modes were used to approximate the acoustic velocity field behaviour at the pipe fundamental frequency. The temporal modes shapes are in a good agreement with the microphone pressure signal shape registered from a distance. Obtained decomposed spatial modes give interesting insight into sound generating region of the organ pipe and the transition area towards the pure acoustic field inside the resonance pipe. They can give qualitative and quantitative data to verify existing sound generation models used in Computational Fluid Dynamics (CFD) and Computational Aero-Acoustics (CAA).
    Źródło:
    Archives of Acoustics; 2015, 40, 4; 475-484
    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:
    Acoustic Intensity Imaging Methods for in-situ Wave Propagation
    Autorzy:
    Weyna, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/177914.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    scientific visualization
    acoustic mapping
    wave propagation
    sound intensity
    noise control
    Opis:
    In the paper the author has described the visualization methods in acoustic flow fields and show how these methods may assist scientists to gain understanding of complex acoustic energy flow in real-life field. A graphical method will be presented to determine the real acoustic wave distribution in the flow field. Visualization of research results, which is unavailable by conventional acoustics metrology, may be shown in the form of intensity streamlines in space, as a shape of floating acoustic wave and intensity isosurface in three-dimensional space. In traditional acoustic metrology, the analysis of acoustic fields concerns only the distribution of pressure levels (scalar variable), however in a real acoustic field both the scalar (acoustic pressure) and vector (the acoustic particle velocity) effects are closely related. Only when the acoustic field is described by both the potential and kinetic energies, we may understand the mechanisms of propagation, diffraction and scattering of acoustic waves on obstacles, as a form of energy image. This attribute of intensity method can also validate the results of CFD/CAA numerical modeling which is very important in any industry acoustic investigations.
    Źródło:
    Archives of Acoustics; 2010, 35, 2; 265-273
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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