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    Wyświetlanie 1-15 z 15
    Tytuł:
    Acoustic study of a baroque church
    Autorzy:
    Sygulska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2146555.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    church acoustics
    architectural acoustics
    Baroque church
    reverberance
    akustyka kościoła
    akustyka architektoniczna
    kościół barokowy
    dźwięczność
    Opis:
    The issue of sonic heritage in sacred historic buildings is gaining popularity and becoming a frequent subject of discussions. The Baroque St Joseph Church of Carmelite Fathers, a minor basilica, is, architecturally and culturally, an exceptional place in Poznań, a city located in western Poland. The church is often used as a concert venue. It underwent an acoustic study with the use of a sound source situated in the presbytery and on the pulpit. The aim of this paper is to present results of acoustic investigations and to compare its acoustic properties with other churches. Acoustic parameters acknowledged as primary values used to assess acoustic properties of a religious building were investigated and then compared with recommended values. Placement of the source in two measurement points rendered it possible to carry out speech intelligibility analyses for a variable position of the sound source, and, in effect, enabled functional assessment of the historic pulpit. Thus obtained results were compared with European Baroque churches whose parameters are available in the literature.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020228
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic investigations of the contemporary churches in Poznań
    Autorzy:
    Sygulska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/127937.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    church acoustics
    acoustic investigation in church
    akustyka kościoła
    badanie akustyki
    Opis:
    The paper discusses acoustic issues of contemporary churches. Church interiors should be designed so as to obtain intelligibility of speech and simultaneously take organ music into account. It is a tough task as acoustic parameters required for speech and organ music are entirely different. Analysis of the issue was carried out on the basis of investigations in five contemporary churches in Poznań. In total, seven interiors were investigated as two of the churches were two-storeyed. The acoustic investigations were conducted by means of an omnidirectional sound source, a SVAN 945A Sound Level Meter and the DIRAC programme. RT, Ts, C80 and C50 were measured. The acoustic parameters were compared with values recommended for churches. The investigations allowed to draw clear conclusions concerning the influence of architecture of the interior on acoustic parameters.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 281-288
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of changing body position on selected voice parameters
    Autorzy:
    Węglarz, Karolina
    Wszołek, Wiesław
    Hemmerling, Daria
    Powiązania:
    https://bibliotekanauki.pl/articles/24201974.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    speech acoustics
    signal processing
    medical diagnostics
    akustyka mowy
    przetwarzanie sygnałów
    diagnostyka medyczna
    Opis:
    Correct posture is a key element in the proper functioning of the entire body. Both defects and postural disorders lead to overload syndromes and degenerative changes in the musculoskeletal system. Different body positions correlate with respiratory parameters, which form the basis in modifying loudness and accentuation when speaking or singing Body posture can affect the quality of the voice signal and its fatigue. As movement and duration intensify, vocal effort increases. What is still open, however, is the problem of speech signal evaluation, especially in order to obtain assessments useful in the context of supporting medical diagnosis, optimizing therapy and monitoring rehabilitation. Meanwhile, such evaluations are what we need in medicine, rehabilitation and sports. This paper presents excerpts from a study of the effects of changes in posture and fatigue in healthy subjects, and those with phonation disorders, on changes in the acoustic parameters of the speech signal.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022320
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cinema hall adapted for opera singing - acoustic assessment
    Autorzy:
    Sygulska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/24201979.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    acoustic adaptation
    opera house acoustics
    reverberation time in an opera house
    adaptacja akustyczna
    akustyka opery
    czas pogłosu
    Opis:
    Room acoustics must be adapted to the intended function, and acoustic requirements vary depending on the type of sound production. Acoustic investigations were carried out in the hall of the Olimpia Academic Music Theater, which was originally a cinema. Acoustic requirements for cinemas are entirely different from those for opera singing. To ensure good acoustic conditions in the interior, an architectural adaptation or introduction of variable acoustics is necessary. The analysed interior was adapted to the needs of opera singing and the cinema function was abandoned. The objective of the research is to evaluate the acoustic quality of the hall for the purposes of an opera house.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023115
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simulation of thinning of microphone array in near-field broadband beamformers
    Autorzy:
    Wielgus, Agnieszka
    Szlachetko, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/2146656.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    acoustics
    beamforming systems
    microphone array
    thinning technique
    akustyka
    beamforming
    macierz mikrofonów
    technika przerzedzania
    Opis:
    This paper is devoted to the problem of designing an optimal microphone matrix. We define a criterion function where the performance of our matrix should be as close as possible to the desired one based on L2 norm. In the classical approach, increasing a size of the matrix is used to improve the system performance. However, in many cases it is not a good solution. In this paper we propose a solution based on thinning technique. We work with rectangular, equispaced microphone matrix and using metaheuristic approach called simulated annealing we optimise the set of active microphones (we switch off some of the microphones from the regular matrix). For illustrations, few numerical examples are solved. Comparing to the classical approach we show that thinning microphone matrix can significantly improve system performance.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021204
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    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:
    Educating of architectural students in acoustics as an answer to the reverberant noise standard
    Autorzy:
    Sygulska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2146630.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    education
    architectural acoustics
    reverberant noise
    reverberation time
    designing
    edukacja
    akustyka architektoniczna
    hałas odbity
    czas pogłosu
    projektowanie
    Opis:
    Implementation of the new standard PN-B-02151-4 - Building Acoustics - Protection against Noise in Buildings, Part 4: Requirements for Reverberation Conditions and Indoor Speech Intelligibility and Testing Guidelines imposes on architects an obligation to design interiors in compliance with acoustic requirements. The above regulations give rise to the need to educate future architects so that the standard can be practically employed in their professional career. The aim of the article is to describe a teaching method tailored for students of architectural design compliant with the standard requirements without using specialized software programmes. The paper presents two types of design tasks that form a basis for teaching students within the framework of design practice in building physics - acoustics. The article shows how to teach students to facilitate full acquisition of the rules governing interior design compliant with reverberation parameters suitable for the assumed function, and to enable thorough comprehension of interior design.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021213
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of the sound reflection model on the ray tracing simulation variability
    Autorzy:
    Binek, Wojciech
    Chojak, Aleksandra
    Kamisiński, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2146657.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    geometrical acoustics
    BRDF
    diffuse rain
    next event estimation
    akustyka geometryczna
    estymacja następnego zdarzenia
    Opis:
    Geometrical acoustics is the most commonly used method of room acoustics prediction. Its efficiency can be improved by explicit calculation of ray contribution to each receiver during reflection called algebraic reflection. The aim of this research is to analyse the applicability and impact of reflection model choice on algebraic reflection calculation using the ray tracing with next event estimation. The tested reflection models include the specular and Lambert reflection combination and the Phong reflection model. Classical ray tracing algorithm, without algebraic reflections, is used as a reference. Based on simulation results and statistical analysis we conclude that the change of the reflection model significantly affects the acoustics conditions within the simulation changing echograms in early reflections region and the reverberation times. Statistical analysis proved that echograms obtained with the combination of ray tracing with next event estimation and Phong reflection model have lowest simulation to simulation variability.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021203
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of an ambisonic microphone for the measurements of room acoustic parameters
    Autorzy:
    Jasiński, Maciej
    Żera, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/24201951.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    room acoustics
    ambisonics
    spatial impulse response
    acoustical measurements
    akustyka wnętrz
    ambisonia
    przestrzenna odpowiedź impulsowa
    pomiary akustyczne
    Opis:
    The most commonly used measurement technique in room acoustics employs a single omnidirectional microphone for recording the room impulse response and further derivation of such acoustical parameters as T30, EDT, C50 or C80. Instead, ambisonic technology makes it possible to measure a spatial room impulse response. Ambisonics decomposes the signal from the spherical microphone array into spherical harmonics to shape the directivity. Ambisonics lets to go beyond basic acoustical parameters and allows to determine spatial features of a sound field at the measurement point. This study presents the comparison of fundamental acoustic parameters measured in the recording studio by an actual omnidirectional microphone and virtual omnidirectional microphones derieved from ambisonic microphones of the first and third order. The results show the usefulness of ambisonic technology in terms of assessing basic room parameters.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022312
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of low-frequency sound field in rooms with complex-valued boundary conditions on walls
    Autorzy:
    Meissner, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/128275.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    room acoustics
    modal vibrations
    room impulse response
    complex wall impedance
    akustyka pomieszczeń
    drgania modalne
    metoda wymuszeń impulsowych
    Opis:
    A modal representation of a room impulse response has been used to formulate expressions for low-frequency sound field in rooms of arbitrary shape. Based on theoretical results, a simulation program has been developed to predict a sound pressure distribution and a room transfer function for rectangular enclosure having walls covered by a material of complex impedance. Calculation results have shown that changes in the wall reactance entail a substantial modification of a sound pressure distribution. Furthermore, an influence of wall reactance on the room transfer function was investigated and it was discovered that a change in a reactance sign causes a shift in frequencies of modal vibrations excited in the room.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of acoustic banners depending on their arrangement in the concert hall - case study
    Autorzy:
    Kozłowski, Piotr Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/127916.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    room acoustics
    adjusting room acoustics
    acoustic banners
    multipurpose venues
    akustyka pomieszczenia
    korygowanie akustyki pomieszczenia
    panel akustyczny
    sala koncertowa
    Opis:
    One of the most frequently used methods of adjusting the room acoustics of concert halls is the temporary introduction of additional acoustic absorption in the form of acoustic banners. Banners are implemented in the form of fabric surfaces placed vertically or horizontally along the walls of concert halls. In practice, one or two layers of heavyweight fabrics are used, characterized by a high value of the sound absorption coefficient. Simplified methods of designing acoustic banners assume estimating the effectiveness of adjusting the reverberation time on the basis of the static theory. The paper presents the results of measuring the effectiveness of acoustic banners carried out in the concert hall. The possibility of tuning the interior acoustics was verified depending on the position of the banner in the room as well as the degree of its opening.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Project of acoustic adaptation of the church with a long reverberation time
    Autorzy:
    Brański, Adam
    Janas, Lucjan
    Prędka, Edyta
    Klich, Rafał
    Szynal, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/2202418.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    interior acoustics
    reverberation time
    sound-absorbing material
    plaster
    akustyka wnętrz
    czas pogłosu
    materiały dźwiękochłonne
    tynki
    Opis:
    Long reverberation times are a problem in modern churches. General methods of solving the problem are given in the literature. The basic approach is to increase the acoustic absorption of the church, and this can be achieved by placing sound-absorbing materials on the walls. Due to the price, materials with a high absorption coefficient are not used. They are replaced with sound-absorbing plasters. For the known coefficient of sound absorption by plaster, the problem is to calculate the surface of the plaster coverage and its distribution on the surface. This problem was solved for the Academic Church in Rzeszow, the Roman Catholic Parish of St. Jadwiga Queen. The reverberation time before adaptation is equal to 6.78 s, while the predicted time after adaptation is 1.98 s.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022209
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Required attenuation of aircraft noise in buildings in the light of data from the Chopin Airport monitoring
    Autorzy:
    Rudno-Rudziński, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/128150.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    building acoustics
    aircraft noise
    permissible noise level in buildings
    akustyka budynku
    hałas lotniczy
    dopuszczalny poziom hałasu w budynkach
    Opis:
    The minimum attenuations of aircraft noise required by the Polish Standards concerning acoustic insulation and noise levels inside buildings have been compared. Data from the noise monitoring system of the Chopin Airport were used. The minimum attenuation required by PN-B-02151-02:1987 differs from that required by PN-B-02151-3:2015-10. The highest required attenuation occurs when taking into account the maximum sound level LAmax of aircraft noise. The requirements related to LAmax are 2.0 to 7.8 dB higher than those associated with the equivalent sound level LAeq. If the number of flight operations at night reaches the allowed maximum number of forty, the requirements related to LAeq may be decisive. The requirements connected with LAeq according to PN-B-02151-02:1987 are 0.6 to 2.6 dB higher than coming from PN-B-02151-3:2015-10.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and CFD study of the selected acoustic helicoidal resonator as a final element of an air installation
    Autorzy:
    Łapka, Wojciech
    Jakubowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/24201987.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    acoustic resonator
    experiments
    duct acoustics
    air diffusers
    air terminal devices
    rezonator akustyczny
    doświadczenia
    akustyka falowodu
    dyfuzor powietrza
    elementy wywiewne
    Opis:
    The work presents an analysis of the selected helicoidal resonator as the end element of the air installation. Laboratory tests of the acoustic pressure level were performed at the outlet of the air installation in a room for different flow speeds. The measurement methodology in accordance to standards PN-EN ISO 3741 and PN-EN ISO 5135, which describes the acoustic test facilities, instrumentation and procedures to be used for precision grade determination of sound power levels in octave or one-third-octave bands of a noise source in reverberation test rooms. The numerical CFD tests show the shape of the air stream in the function of the distance from the installation outlet for different flow speeds. Due to the helicoidal shape of the analyzed acoustic helicoidal resonator, the air stream also turns, which can be used to effectively mix air in the room.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023112
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural damage detection using non-classical vibro-acoustic approaches
    Autorzy:
    Dziedziech, K.
    Pieczonka, Ł.
    Dao, P. B.
    Klepka, A.
    Uhl, T.
    Staszewski, W. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/128297.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    structural damage detection
    fatigue cracks
    delamination
    time-variant modal analysis
    nonlinear acoustics
    cointegration
    wykrywanie uszkodzeń konstrukcji
    pęknięcia zmęczeniowe
    delaminacja
    akustyka nieliniowa
    kointegracja
    Opis:
    The paper demonstrates how non-classical approaches can be used for structural health monitoring. Wavelet-based modal analysis, various non-classical nonlinear acoustic techniques and cointegration are used for damage detection. These approaches are illustrated using various examples of damage detection in metallic and composites structures.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 13-24
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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