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Wyszukujesz frazę "Linde, B.B.J." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modal Analysis of a Trapezoidal Violin Built after the Description of Félix Savart
    Autorzy:
    Duerinck, T.
    Skrodzka, E.
    Linde, B.B.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/177176.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    trapezoidal violin
    modal analysis
    mode shapes
    Opis:
    One-dimensional experimental modal analysis of an unvarnished trapezoidal violin built after the description of F. Savart and an anonymous trapezoidal violin on display in the Music Instrument Museum of Brussels is described. The analysis has revealed ten prominent modes. A mode that may potentially play a role of the “tonal barometer” of the instrument is pointed out. The mode shapes are symmetric and of high amplitude, due to the construction of the instrument. Subjective evaluation of the sound quality demonstrated no pronounced difference between the trapezoidal violin and normal violin.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 623-628
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Bass Bar Tension on Modal Parameters of a Violin’s Top Plate
    Autorzy:
    Skrodzka, E. B.
    Linde, B.B.J.
    Krupa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177670.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    violin
    modal analysis
    bass bar tension
    Opis:
    Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1−).
    Źródło:
    Archives of Acoustics; 2014, 39, 1; 145-149
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modal Parameters of Two Violins with Different Varnish Layers and Subjective Evaluation of Their Sound Quality
    Autorzy:
    Skrodzka, E. B.
    Linde, B.B.J.
    Krupa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176852.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    violin
    modal analysis
    varnish
    subjective sound quality evaluation
    Opis:
    Two violins were investigated. The only intentionally introduced difference between them was the type of varnish. One of the instruments was covered with a spirit varnish, the other was oil varnished. Experimental modal analysis was done for unvarnished/varnished violins and a questionnaire inquiry on the instrument’s sound quality was performed. The aim of both examinations was to find differences and similarities between the two instruments in the objective (modal parameters) and subjective domain (subjective evaluation of sound quality). In the modal analysis, three strongly radiating signature modes were taken into account. Varnishing did not change the sequence of mode shapes. Modal frequencies A0 and B(1+) were not changed by oil varnishing compared to the unvarnished condition. For the oil varnished instrument, the frequency of mode B(1+) was lower than that of the same mode of the spirit varnished instrument. Our two violins were not excellent instruments, but before varnishing they were practically identical. However, after varnishing it appeared that the oil-varnished violin was better than the spirit-varnished instrument. Therefore, it can be assumed with a fairly high probability that also in general, the oil-varnished violins sound somewhat better than initially identical spirit-varnished ones.
    Źródło:
    Archives of Acoustics; 2013, 38, 1; 75-81
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoacoustic Method as a Tool for Analysis of Concentration-Dependent Thermal Effusivity in a Mixture of Methyl Alcohol and Water
    Autorzy:
    Ponikwicki, Nikodem
    Szczepanik, Łukasz
    Gondek, Joanna
    Linde, Bogumił B.J.
    Skrodzka, Ewa Barbara
    Molchanov, Vladimir
    Yushkov, Konstantin B.
    Grechishkin, Rostislav
    Powiązania:
    https://bibliotekanauki.pl/articles/177617.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    thermal effusivity
    aqueous solutions
    methanol
    photoacoustic technique
    Opis:
    It has been shown in the present paper that exploitation of the experimental potential of a photoacoustic technique can provide information on a type of intermolecular interactions in aqueous mixtures containing organic liquids, when the basic parameters of these mixtures, such as density, ρ, specific heat, cp, or thermal conductivity, λ, are unknown. Earlier investigations of concentration dependence of effusivity in different aqueous solutions of organic liquids demonstrated that the photoacoustics method is a sensitive tool to identify hydrophobic properties of such liquids. In our experiment this suggestion was exploited for a solution of methanol which is known to display much weaker hydrophobicity than other alcohols. It was confirmed that the location of extreme deviations from linearity for the thermal effusivity, Δe, agrees well with that of characteristic points for the isentropic compressibility coefficient, κS, and the excess molar volume, VEm , as a function of the concentration.
    Źródło:
    Archives of Acoustics; 2019, 44, 1; 153-160
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of wavy sea surface oil-derivative contamination with forward specular high-frequency scattering
    Autorzy:
    Pogorzelski, Stanisław
    Rochowski, Paweł
    Grzegorczyk, Maciej
    Linde, Bogumił B. J.
    Skrodzka, Ewa
    Bielasiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/260616.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    crude oil contamination
    capillary wave damping
    acoustic surface scattering
    statistical-frequency analyses
    at-sea pollution detection
    Opis:
    A spectrum of low-frequency (20‒30 Hz) amplitude fluctuations of the ultrasonic (10 MHz) signal specularly scattered from water surfaces covered with monomolecular and thicker crude oil origin films of well-defined, oceanographically relevant viscoelastic properties was examined in laboratory and at-sea conditions. The relationship between the Surface water wave (30 Hz) damping coefficient and the oil layer thickness was established, and compared to the one predicted by the classical Stokes theory. The depression of the spectral energy density of wind-driven waves by surface films was inferred from the ratio of acoustic signal fluctuations spectra with/without films, and compared to that resulting from the Marangoni damping theory applicable to monolayers of particular surface viscoelasticity. The agreement between the theory and experimental data was satisfactory. As shown in at-sea experiments performed with a free-floating, buoy-like acoustic system, and an artificial oil slick spread over the Baltic Sea surface, the film’s rheological Surface properties can be recovered from acoustic surface probing, as well as oil spill edge detection. Simultaneous statistical analyses of the scattered signal amplitude distribution parameters turned out to be unequivocally related to the oil substance fraction weight, oil layer thickness, and the form of oil contamination.
    Źródło:
    Polish Maritime Research; 2020, 1; 173-179
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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