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    Wyświetlanie 1-4 z 4
    Tytuł:
    Reconditioning in synchronous operation with one parallel induction generator
    Autorzy:
    Magalhães, A. S.
    Moraes, P. H. F.
    Silva, A. H. F.
    Gomes, P. H. G.
    Alves, A. J.
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136216.pdf
    Data publikacji:
    2016
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    repowering
    induction generator
    synchronous generator
    harmonics
    Opis:
    The purpose of this paper is to compare mathematical modeling and practical bench in order to validate the electrical interactions between an induction generator and a synchronous generator. Two generators was connected to a common bus in steady state, subject to non-linear load. The results comparing modeling and bench tests show that the induction generator besides the active power increasing, has a better way for harmonic currents flowing in common bus. It was concluded that the induction generator repowering and attenuates current harmonic components present at the connection point, improving the network voltage profile.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2016, 1, 4; 66-72
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Separation of isochromatics and isoclinics phasemaps for the photoelastic technique with use phase shifting and a large number of high precision images
    Autorzy:
    Magalhaes, C. A.
    Neto, P. S.
    Magalhaes Jr P. A., A.
    de Barcellos, C. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/220820.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photoelasticity
    metrology
    stress analysis
    strain measurement
    optical measurement systems
    optical interferometry
    experimental techniques
    Opis:
    Digital photoelasticity is an important optical metrology follow-up for stress and strain analysis using full-field digital photographic images. Advances in digital image processing, data acquisition, procedures for pattern recognition and storage capacity enable the use of the computer-aided technique in automation and facilitate improvement of the digital photoelastic technique. The objective of this research is to find new equations for a novel phase-shifting method in digital photoelasticity. Some innovations are proposed. In terms of phaseshifting, only the analyzer is rotated, and the other equations are deduced by applying a new numerical technique instead of the usual algebraic techniques. This approach can be used to calculate a larger sequence of images. Each image represents a pattern and a measurement of the stresses present in the object. A decrease in the mean errors was obtained by increasing the number of observations. A reduction in the difference between the theoretical and experimental values of stresses was obtained by increasing the number of images in the equations for calculating phase. Every photographic image has errors and random noise, but the uncertainties due to these effects can be reduced with a larger number of observations. The proposed method with many images and high accuracy is a good alternative to the photoelastic techniques.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 127-138
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Philology as a systematic method of documentation and its application to the study of Constança Capdeville’s musical works
    Autorzy:
    Magalhães, Filipa
    Powiązania:
    https://bibliotekanauki.pl/articles/1797349.pdf
    Data publikacji:
    2020-12-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    digital philology
    audio preservation
    documentation
    contemporary Portuguese music
    Constança Capdeville
    Opis:
    The advent of new music technologies has led to a rapid growth of the audio preservation field. Music is not independent of its medium, and this growing loss of independence calls for a transdisciplinary approach with a strong technological component. Musical compositions created in the second half of the twentieth century exist in the intersection of technology, embodiment, and sound and thus widen the importance of aspects such as human and non-human interactions. This article will reflect on these issues and how they reframe (digital) philology methods through the works of Constança Capdeville. The works by this seminal artist are accompanied by an extensive archive that includes scores, recorded sounds, video and images, among other documents. It will be demonstrated how a reflexive approach to digital philology can bring concealed archival stories to light while fostering new meanings on what it means to preserve our sound heritage. Resource optimisation is one of the reasons methods of traditional philology are particularly useful for the preservation of contemporary musical heritage. Today the amount of information is excessive, and categorisation and organisation are complex. Most information exists in the form of digitised documents, that comply with certain requirements traditionally applied to secular paper registers while assessing qualities such as reliability and authenticity. Traditional philology approaches framed around these qualities are insufficient for born-digital documents. A reflexive approach to digital philology, focussed both on the creation of digital resources (from digitalisation to cataloguing) and the criticism of digital sources, as a solution the digital treatment of documents is proposed. A comparative approach will be used to understand in what ways digital and analogue media intertwine in the forms we think, reflect, historicise, and preserve our sound archives, and how we make visible aspects that were previously concealed through new forms of categorising and digitising documents.
    Źródło:
    Interdisciplinary Studies in Musicology; 2020, 20; 64-78
    1734-2406
    Pojawia się w:
    Interdisciplinary Studies in Musicology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method
    Autorzy:
    Ferreira, T. S.
    Magalhães, P. A.
    Moura, F. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/176986.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    finite element method
    acoustic control
    trimmed body
    numerical experimental correlation
    modal damping
    Opis:
    This work focuses on finding a numerical solution for vehicle acoustic studies and improving the usefulness of the numerical experimental parameters for the development stage of a new automotive project. Specifically, this research addresses the importance of modal cavity damping for vehicle exerts during numerical studies. It then seeks to suggest standardized parameter values of modal cavity damping in vehicular acoustic studies. The standardized value of modal cavity damping is of great importance for the study of vehicular acoustics in the automotive industry because it would allow the industry to begin studies of the acoustic performance of a new vehicle early in the conception phase with a reliable estimation that would be close to the final value measured in the design phase. It is common for the automotive industry to achieve good levels of numerical-experimental correlation in acoustic studies after the prototyping phase because this phase can be studied with feedback from the simulation and experimental modal parameters. Thus, this research suggests values for modal cavity damping, which are divided into two parts due to their behaviour: ξ(x) = −0.0126(x − 100) + 6.15 as a variable function to analyse up to 100 Hz and 6.15% of modal cavity damping constant for studies between 30 Hz and 100 Hz. The sequence of this study shows how we arrived at these values.
    Źródło:
    Archives of Acoustics; 2016, 41, 1; 87-97
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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