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    Wyświetlanie 1-14 z 14
    Tytuł:
    Acoustic Modelling of Sport and Hunting Shooting Ranges in the Aspect of Shaping Noise Emissions Into the Environment
    Autorzy:
    Boczkowski, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2064764.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    noise
    sound propagation
    acoustic modelling
    shooting ranges
    Opis:
    The article deals with the problem of acoustic modelling of sport and hunting shooting ranges for the purposes of carrying out acoustic impact assessments on the environment. The fashion for recreational shooting and the dynamic development of shooting ranges resulted in conflict situations between the shooting range and the residents. Increasingly, the condition for allowing the shooting range to be used is to carry out an acoustic analysis to confirm the lack of noise nuisance. Therefore, it is necessary to develop guidelines for acoustic modelling of shooting ranges, taking into account their purpose and types of shooting axes. Each of the shooting axes is designed for a different type of shooting and thus has different acoustic characteristics. In the article, the author presents a method of modelling noise emissions from the shooting range on the example of one of the popular shooting competitions which is the hunting trap. First, acoustic measurements of the unit noise source related to the firing of shots by a firearms shooter were made. Then the directional characteristics of this source were determined, the shooting axis of the “hunting trap” type was modelled during a typical shooting competition and its directionality was determined. Then, on the example of a specific shooting range, the possibility of using the results to analyse the propagation of noise into the environment during typical shootings on the trap axis was presented.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 308--319
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of the Sound Absorption Coefficient of Auditorium Seats for Various Geometries of the Samples
    Autorzy:
    Rubacha, J.
    Pilch, A.
    Zastawnik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176676.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound absorption
    room acoustics
    modelling of acoustic parameters
    Opis:
    This paper presents the results of measurements of the sound absorption coefficient of auditorium seats carried out in the laboratory using two methods. In the first one, small blocks of seats in various arrangements were studied in a reverberation chamber to determine the absorption coefficient of an auditorium of infinite dimensions. The results were compared to the values of the absorption coefficient measured using the second method, which involved samples enclosed within a frame screening the side surfaces of other auditorium blocks. The results of both methods allowed for the assessment of the sound absorption coefficient of an auditorium of any dimensions while taking into account the sound absorption by the side surfaces. The method developed by the authors will simplify the currently known measurement procedures.
    Źródło:
    Archives of Acoustics; 2012, 37, 4; 483-488
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratory modelling and acoustic diagnostics of hydrodynamical processes
    Autorzy:
    Chernov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/331504.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    hydrodynamical processes
    laboratory modelling
    acoustic diagnostics
    Opis:
    In the present paper results of modelling of wind interaction with a water layer surface and research of the vortical structures arising downstream the flow around bodies are described. Results of the use of the method of acoustic diagnostics of spatially - periodic vortical flows are presented. At physical modelling in laboratory conditions wind was created with a low-velocity wind tunnel. The structure of an air stream and convective cells on water surface was investigated with the help of visualization. Some pictures of structures on the shallow sea surface are also demonstrated and discussed.
    Źródło:
    Hydroacoustics; 2008, 11; 47-54
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite Element Analysis of SAW Sensor with ZnO Substrate for Dichloromethane (DCM) Gas Detection
    Autorzy:
    Moustafa, Mohamed
    Laouini, Ghaylen
    Alzoubi, Tariq
    Powiązania:
    https://bibliotekanauki.pl/articles/1945651.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    surface acoustic wave
    SAW
    gas sensors
    VOCs
    FEM modelling
    Opis:
    A SAW gas sensor based on Zinc Oxide (ZnO) piezoelectric substrate is simulated and evaluated for the detection of the dichloromethane (DCM) volatile organic compound (VOC). The study is performed based on the finite element method (FEM) using COMSOL Multiphysics software. The obtained device response using the ZnO substrate is compared to the one using the typical lithium niobate (LiNbO3) piezoelectric substrate. A thin film of polyisobutylene (PIB) membrane is selected to act as the sensing layer. The obtained results reveal a linear behaviour of the resonance frequency downshift (i.e., the sensor sensitivity) versus the investigated gas concentrations varying from 10 ppm to 100 ppm of DCM gas. Additionally, the sensor response is investigated by applying several thicknesses of PIB ranging from 0.3 µm to 1.0 µm. The observed sensor response shows less dependence on the PIB thickness using the ZnO substrate than the LiNbO3 one.
    Źródło:
    Archives of Acoustics; 2021, 46, 3; 419-426
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of acoustic backscattering by southern Baltic herring
    Autorzy:
    Idczak, J.
    Gorska, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/331977.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    acoustic biomass estimation
    Baltic herring
    target strength
    modelling approach
    X-ray images
    Opis:
    Assessment of Baltic herring abundance can be carried out using acoustic techniques. Analysis of the relationship between the Baltic herring individual target strength, TS, and the total fish length, L, important for the acoustic assessment, showed the relationship to be dependent on the location of the study area. This finding motivated a detailed analysis of the relationship for the herring occurring in the southern Baltic ICES subdivisions 24, 25, and 26, in which Poland is responsible for the acoustic herring abundance assessment. The paper addresses the numerical analysis of the backscattering properties of the southern Baltic herring. The modelling approach used to study the backscattering was based on the Modal Series-Based Deformed Cylinder Model approximation. Details of the individual herring swimbladders were taken into account. Morphometric data necessary for the analysis was obtained from X-ray images of herring from the Polish coastal zone (ICES subdivision 26).
    Źródło:
    Hydroacoustics; 2016, 19; 145-152
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ehksperimentalnye issledovanija teploobmena v ehlementakh termoakusticheskikh apparatov
    Experimental studies of heat exchanges in the elements of thermoacoustic devices
    Autorzy:
    Korobko, V.
    Moskovko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/78138.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    thermoacoustic device
    heat transfer
    energy
    heat pump
    acoustic wave
    CFD modelling
    experimental study
    Opis:
    This paper presents an analysis of the heat transfer processes characteristics between the elements of thermoacoustic heat machines (TAHM). The possible mechanisms these factors influence on the performance of TAHM is shown. The results of CFD simulation, physical experiments, and experimental plant schematic are shown.
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and Measurement of Folk Guitar : Truss Rod and Strings in Numerical Analysis of Tone
    Autorzy:
    Bielski, Paweł Michał
    Kujawa, Marcin
    Lubowiecka, Izabela
    Powiązania:
    https://bibliotekanauki.pl/articles/176738.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    sound quality
    musical instruments
    acoustic folk guitar
    string tension
    truss rod
    non-linear modelling
    Opis:
    The study makes an attempt to model a complete vibrating guitar including its non-linear features, specifically the tension-compression of truss rod and tension of strings. The purpose of such a model is to examine the influence of design parameters on tone. Most experimental studies are flawed by uncertainties introduced by materials and assembly of an instrument. Since numerical modelling of instruments allows for deterministic control over design parameters, a detailed numerical model of folk guitar was analysed and an experimental study was performed in order to simulate the excitation and measurement of gitar vibration. The virtual guitar was set up like a real guitar in a series of geometrically non-linear analyses. Balancing of strings and truss rod tension resulted in a realistic initial state of deformation, which affected the subsequent spectral analyses carried out after dynamic simulations. Design parameters of the gitar were freely manipulated without introducing unwanted uncertainties typical for experimental studies. The study highlights the importance of acoustic medium in numerical models.
    Źródło:
    Archives of Acoustics; 2019, 44, 1; 35-49
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sound Field Modelling and Noise Reduction for a Forklift Power Compartment Based on Perfectly Matched Layer and Acoustic Packaging Design
    Autorzy:
    Zhang, Enlai
    Liu, Zhiqi
    Zhang, Jingjing
    Lin, Jiahe
    Powiązania:
    https://bibliotekanauki.pl/articles/1945640.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    forklift power compartment
    sound field modelling
    perfectly matched layer
    acoustic packaging design
    noise reduction
    Opis:
    The core goal of this paper is to put forward a feasible scheme of noise reduction for a target forklift on the basis of solving the problem of vibration and acoustic radiation from complex structures in infinite domain. Based on the previous report and vibration acceleration tests, the acoustic virtual wind tunnel model of forklift power compartment was established using finite element method and boundary element method, in which the perfectly matched layer was first applied to simulate the attenuation propagation of sound waves in air. In addition, according to the distribution characteristics of sound pressure field with different frequencies, the acoustic energy mainly radiated through the bottom and right side, and concentrated in the low frequency. Consequently, the acoustic packaging design for the whole forklift power compartment was presented, and a satisfying noise reduction effect was achieved.
    Źródło:
    Archives of Acoustics; 2021, 46, 3; 491-498
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrode Mass Loading Effects on Different Piezoelectric Substrates for Saw Delay Lines: A Comparative FEM Analysis
    Autorzy:
    George, Sheeja P.
    Isaac, Johney
    Philip, Jakob
    Powiązania:
    https://bibliotekanauki.pl/articles/2141693.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inter-digital transducers
    surface acoustic wave devices
    finite element analysis
    numerical modelling and simulation
    ANSYS
    Opis:
    Several modelling techniques are currently available to analyse the efficiency of inter-digital transducers (IDTs) fabricated on piezoelectric substrates for producing surface acoustic wave (SAW) devices. Impulse response method, equivalent circuit method, coupling of modes, transmission matrix method, and numerical techniques are some of the popular ones for this. Numerical techniques permit modelling to be carried out with any number of finger electrode pairs with required boundary conditions on any material of interest. In this work, we describe numerical modelling of SAW devices using ANSYS to analyse the effect of mass loading, a major secondary effect of IDTs on the performance of SAW devices. The electrode thickness of the IDT influences the resonance frequency of the SAW delay line. The analysis has been carried out for different electrode materials, aluminium, copper, and gold, for different substrate materials, barium titanate (BaTiO3), X-Y lithium niobate (LiNbO3), lithium tantalate (LiTaO3), and the naturally available quartz. The results are presented and discussed.
    Źródło:
    Archives of Acoustics; 2022, 47, 1; 89-95
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the effect of electric vehicles on noise levels in the vicinity of rural road sections
    Modelowanie wpływu pojazdów elektrycznych na poziom hałasu w otoczeniu odcinków dróg zamiejskich
    Autorzy:
    Hałucha, Maciej
    Bohatkiewicz, Janusz
    Mioduszewski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/27312158.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    pojazd elektryczny
    modelowanie
    hałas drogowy
    środowisko
    obliczenia akustyczne
    electric vehicle
    traffic noise
    modelling
    environmental
    acoustic calculations
    Opis:
    Numerous European countries experience a steady increase in the share of electric (EV) and hybrid electric (HEV) vehicles in the traffic stream. These vehicles, often referred to as low- or zero-emission vehicles, significantly reduce air pollution in the road environment. They also have a positive effect on noise levels in city centers and in the surroundings of low-speed roads. Nevertheless, issues related to modeling noise from electric and hybrid vehicles in the outdoor environment are still not fully explored, especially in the rural road settings. The article attempts to assess the degree of noise reduction around these roads based on different percentages of EVs in the traffic stream. Input data for noise modeling was obtained from 133 sections of homogeneous rural roads in Poland. Based on their analysis, it was first determined on how many of these road sections electric-vehicle-induced noise reduction would be possible, taking into account the traffic speeds occurring on them. Next, a computational algorithm that can be used to calculate noise reduction in the CNOSSOS-EU model is presented, and noise modeling is performed based on it for different percentages of electric vehicles in the traffic stream.
    W wielu krajach europejskich obserwowany jest stały wzrost udziału pojazdów elektrycznych i hybrydowych w potoku ruchu. Pojazdy te, zwane często nisko lub zeroemisyjnymi, ograniczają w znacznym stopniu zanieczyszczenia powietrza w otoczeniu dróg. Mają także pozytywny wpływ na poziom hałasu w centrach miast oraz w otoczeniu dróg charakteryzujących się małymi prędkościami. Zagadnienia związane z modelowaniem hałasu pochodzącego od pojazdów elektrycznych i hybrydowych w środowisku zewnętrznym nie są jednak nadal w pełni zbadane, szczególnie w otoczeniu dróg zamiejskich. W artykule podjęto próbę oceny stopnia redukcji hałasu w otoczeniu tych dróg z uwagi na różny udział procentowy pojazdów elektrycznych w potoku ruchu. Dane wejściowe do modelowania hałasu uzyskano z 133 odcinków jednorodnych dróg zamiejskich w Polsce. Na podstawie ich analizy określono najpierw na ilu z tych odcinków dróg możliwa będzie redukcja hałasu powodowana przez pojazdy elektryczne, biorąc pod uwagę występujące na nich prędkości ruchu. Następnie przedstawiono algorytm obliczeniowy, który można wykorzystać do obliczeń redukcji hałasu w modelu CNOSSOS-EU i wykonano na jego podstawie modelowanie hałasu dla różnego udziału procentowego pojazdów elektrycznych w potoku ruchu.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 3; 573--586
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Miniature omnidirectional sound sources used in acoustic scale modeling - measurements and validation
    Autorzy:
    Chojnacki, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/2202420.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    scale modelling
    acoustic reduction models
    room acoustics
    electroacoustics
    modelowanie redukcyjne
    akustyczne modele redukcyjne
    akustyka pomieszczeń
    elektroakustyka
    Opis:
    Acoustic measurements such as scale modeling measurements require a particular type of miniature omnidirectional sound source. The most important aspects of those devices are small sizes (usually below 100 mm in diameter) and different frequency ranges compared to traditional, omnidirectional sound sources used in room acoustics. The required frequency range differs regarding the used scale factor in different models, which leads to the troubles in frequent source changes and the need for a unique source design for every model. The project will present the recent achievement in miniature omnidirectional sound sources development. The optimal sound sources for the given measurement functions were developed based on the previous numerical simulations and experiments such as FEM sound directivity simulations or transducers' parameters tolerance testing. The sound sources presented are used for applications such as acoustic sound insulation scale measurements (frequency range 800 ÷ 63 000 Hz), scaled reverberation chamber measurements (300 ÷ 80 000 Hz), or acoustic reduction models measurements (400 ÷ 70 000 Hz). The paper will cover a detailed technical explanation of the laboratory environment's source construction aspects and validation measurements.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022201
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Panels Inspired by Nature
    Autorzy:
    Borkowski, Bartłomiej
    Suder-Dębska, Katarzyna
    Wiciak, Jerzy
    Szlachta, Anna Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1953507.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic panel
    absorption
    reflection
    design process
    lava cave
    glacier cave
    geometrical method
    3D modelling
    concept design
    Opis:
    The article presents the approach to the design process of acoustic panels based on the scientific research. This approach is based on combining the technical and the design competences to develop the innovative product value for the concept of acoustic panels. The article presents the concepts of two new acoustic panels – an absorbing and scattering panel and a panel reflecting sound waves. The first part of the article presents the starting point for the presented project – the acoustic research and the inspiration for both types of presented solutions. Next, the materials possible to use were discussed, which could reproduce the natural acoustic properties of the lava and glacier caves. The next part presents consecutive stages of the product development in a modern form, ensuring the expected acoustic properties. The last part of the article presents a fully functional solution and proposes further research and development directions.
    Źródło:
    Archives of Acoustics; 2021, 46, 1; 135-146
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical model of energy-related processes in a rotating mechanical system for the purposes of diagnosis of the transmission shafts
    Autorzy:
    Korczewski, Z.
    Marszałkowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073621.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    modelling of energy-related processes
    rotating mechanical system
    transmission shaft
    technical diagnostics
    acoustic emission
    modelowanie procesów związanych z energią
    układ mechaniczny rotacyjny
    wał napędowy
    diagnostyka techniczna
    emisja akustyczna
    Opis:
    In the present article, selected problems connected with identification of slowly changing energy-related processes accompanying high cyclic fatigue of construction materials of simple mechanical systems, with special consideration of transmission shafts, are mentioned for diagnostic purposes. The article also presents physical models of object and processes that in a simplified way reflect mechanical energy transmission from transmission engine to ship propeller.
    Źródło:
    Journal of Polish CIMEEAC; 2016, 11, 1; 69--76
    1231-3998
    Pojawia się w:
    Journal of Polish CIMEEAC
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of typical sources of traffic noise modelling method on the accuracy of calculations of acoustics emission
    Wpływ sposobu modelowania typowych źródeł hałasu drogowego na dokładność obliczeń emisji akustycznej
    Autorzy:
    Boczkowski, A.
    Koźlik, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/112877.pdf
    Data publikacji:
    2013
    Wydawca:
    STE GROUP
    Tematy:
    strategic acoustics maps
    traffic noise
    modelling the traffic noise sources
    accuracy of acoustic calculation
    French calculating method NMPB Routes 96
    strategiczne mapy akustyczne
    hałas drogowy
    modelowanie źródeł hałasu drogowego
    dokładność obliczeń akustycznych
    francuska metoda obliczeniowa NMPB Routes 96
    Opis:
    The implementation of the strategic acoustic maps or evaluation of traffic investments interactions entails the necessity of modelling the traffic noise sources and calculating the emission of acoustic source. The modelling of the traffic noise seems to be the complex matter owing to different methods of modelling the road geometry (e.g. the number of roads and lines) and the possibility of application different methods of calculation. Mentioned factors significantly affect the accuracy in received results. The article below presents the course and the results of the scientific experiment, which main aim was analyzing the impact of different ways of modelling the traffic noise sources and the influence of the applied method of calculation on the accuracy in calculations of road acoustic emission. With particular precision there were explored the results obtained with the use of French calculating method NMPB Routes 96 recommended by The Directive 2002/49/WE for traffic noise calculations.
    Realizacja strategicznych map akustycznych miast lub ocen oddziaływania inwestycji drogowych na klimat akustyczny, wiąże się koniecznością modelowania źródeł hałasu drogowego oraz obliczaniem emisji akustycznej źródła. Modelowanie hałasu drogowego stanowi dość złożony problem, z uwagi na różne sposoby modelowania geometrii dróg (tj. liczby jezdni, liczby pasów ruchu, itp.) oraz możliwość zastosowania różnych metod obliczeniowych. Czynniki te wpływają w istotny sposób na dokładność uzyskiwanych wyników. W artykule przedstawiono przebieg i wyniki eksperymentu badawczego, którego celem było zbadanie wpływu różnego sposobu modelowania źródeł hałasu drogowego oraz wpływu zastosowanej metody obliczeniowej na dokładność obliczeń emisji akustycznej dróg. Szczególnie dokładnie przeanalizowano zbadano wyniki uzyskane przy zastosowaniu francuskiej metody obliczeniowej NMPB Routes 96 zalecanej do obliczeń hałasu drogowego przez Dyrektywę 2002/49/WE.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2013, 1 (3); 18-29
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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