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    Wyświetlanie 1-5 z 5
    Tytuł:
    Computation of electromagnetic forces in the windings of amorphous core transformers
    Autorzy:
    Thanh, Bao Doan
    Tung, Doan Duc
    Le, Tuan-Ho
    Powiązania:
    https://bibliotekanauki.pl/articles/24202732.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    amorphous transformer
    electromagnetic force
    leakage flux
    magnetic vector potential formulation
    short-circuit current
    Opis:
    Electromagnetic forces generated by the short circuit current and leakage flux in low- and high-voltage windings of distribution transformers as well as amorphous core transformers will cause the translation, destruction, and explosion of the windings. Thus, the investigation of these forces plays a significant role for researchers and manufacturers. Many authors have recently used the finite element method to analyze electromagnetic forces. In this paper, an analytic model is first developed for magnetic vector potential formulations to compute the electromagnetic forces (i.e., axial and radial forces) acting on the low- and high-voltage windings of an amorphous core transformer. The finite element technique is then presented to validate the results obtained from the analytical model. The developed model is applied to an actual problem.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 2; 521--539
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibration analysis of sandwich beam with porous FGM core in thermal environment using mesh-free approach
    Autorzy:
    Hung, Tran Quang
    Tu, Tran Minh
    Duc, Do Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/27309844.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    thermal vibration
    mesh-free method
    sandwich beam
    porous materials
    wibracje termiczne
    metoda bezsiatkowa
    belka kanapkowa
    materiały porowate
    Opis:
    Thermally induced free vibration of sandwich beams with porous functionally graded material core embedded between two isotropic face sheets is investigated in this paper. The core, in which the porosity phase is evenly or unevenly distributed,has mechanical properties varying continuously along with the thickness according to the power-law distribution. Effects of shear deformation on the vibration behavior are taken into account based on both third-order and quasi-3D beam theories. Three typical temperature distributions, which are uniform, linear, and nonlinear temperature rises, are supposed. A mesh-free approach based on point interpolation technique and polynomial basis is utilized to solve the governing equations of motion. Examples for specific cases are given, and their results are compared with predictions available in the literature to validate the approach. Comprehensive studies are carried out to examine the effects of the beam theories, porosity distributions, porosity volume fraction, temperature rises, temperature change, span-to-height ratio, different boundary conditions, layer thickness ratio, volume fraction index on the vibration characteristics of the beam.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 3; 471--496
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    BIM competency in personnel recruitment in Vietnam construction enterprises
    Autorzy:
    Anh, Pham Xuan
    Toan, Nguyen Quoc
    Nam, Tran Phuong
    Long, Hoang Duy
    Thang, Do Duc
    Powiązania:
    https://bibliotekanauki.pl/articles/27312107.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    kompetencja
    modelowanie informacji o budynku
    BIM
    rekrutacja personelu
    personel
    firma budowlana
    Wietnam
    competency
    building information modelling
    personnel recruitment
    personnel
    construction company
    Vietnam
    Opis:
    The world has been implementing Building Information Modelling (BIM) successfully to construction projects from small to large scale. In Vietnam and many other countries, BIM is also widely applied in different fields of the construction industry. However, there are still many problems that need to be solved. One of those is to determine the necessary BIM competencies, thereby develop BIM personnel recruitment standards. The article identifies the competencies as well as evaluates their importance when supporting the recruitment of BIM personnel in construction enterprises in Vietnam. Through survey forms such as survey on online recruitment, expert interviews, and survey forms, the study is conducted with Likert scale, relative importance index (RII) for result analysis and ranking the importance of BIM competency for three distinct group of positions in Vietnam. With this result, the authors hope that the study will be an important reference, contributing to the development and concretization of the required competency criteria in the recruitment of BIM personnel in Vietnam and other similar countries.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 381--397
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element model updating of steel-concrete composite bridge: A study case of the Ruri bridge in Vietnam
    Autorzy:
    Nguyen, Duc Cong
    Salamak, Marek
    Katunin, Andrzej
    Gerges, Michael
    Abdel-Maguid, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/27312150.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    analiza drgań
    akcelerometr
    model elementów skończonych
    uaktualnienie
    most betonowy
    optymalizacja roju cząstek
    algorytm genetyczny
    vibration analysis
    accelerometer
    finite element model
    update
    concrete bridge
    particle swarm optimisation
    genetic algorithm
    Opis:
    The study presents the finite element (FE) model update of the existing simple-spans steel-concrete composite bridge structure using a particle swarm optimisation (PSO) and genetic algorithm (GA) approaches. The Wireless Structural Testing System (STS-WiFi) of Bridge Diagnostic, Inc. from the USA, implemented various types of sensors including: LVDT displacement sensors, intelligent strain transducers, and accelerometers that the static and dynamic historical behaviors of the bridge structure have been recorded in the field testing. One part of all field data sets has been used to calibrate the cross-sectional stiffness properties of steel girders and material of steel beams and concrete deck in the structural members including 16 master and slave variables, and that the PSO and GA optimisation methods in the MATLAB software have been developed with the new innovative tools to interface with the analytical results of the FE model in the ANSYS APDL software automatically. The vibration analysis from the dynamic responses of the structure have been conducted to extract four natural frequencies from experimental data that have been compared with the numerical natural frequencies in the FE model of the bridge through the minimum objective function of percent error to be less than 10%. In order to identify the experimental mode shapes of the structure more accurately and reliably, the discrete-time state-space model using the subspace method (N4SID) and fast Fourier transform (FFT) in MATLAB software have been applied to determine the experimental natural frequencies in which were compared with the computed natural frequencies. The main goal of the innovative approach is to determine the representative FE model of the actual bridge in which it is applied to various truck load configurations according to bridge design codes and standards. The improved methods in this document have been successfully applied to the Vietnamese steel-concrete composite bridge in which the load rating factors (RF) of the AASHTO design standards have been calculated to predict load limits, so the final updated FE model of the existing bridge is well rated with all RF values greater than 1.0. The presented approaches show great performance and the potential to implement them in industrial conditions.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 3; 425--443
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods to Estimate the Channel Delay Profile and Doppler Spectrum of Shallow Underwater Acoustic Channels
    Autorzy:
    Nguyen, Van Duc
    Nguyen, Tien Hoa
    Ho, Hoa Xuan Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/176670.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    shallow underwater acoustic
    channel parameters detection
    channel delay profile
    Doppler spectrum
    Opis:
    In this paper, we present the methods to detect the channel delay profile and the Doppler spectrum of shallow underwater acoustic channels (SUAC). In our channel sounding methods, a short impulse in form of a sinusoid function is successively sent out from the transmitter to estimated the channel impulse response (CIR). A bandpass filter is applied to eliminate the interference from out-of-band (OOB). A threshould is utilized to obtain the maximum time delay of the CIR. Multipath components of the SUAC are specified by correlating the received signals with the transmitted sounding pulse with its shifted phases from 0 to 2π. We show the measured channel parameters, which have been carried out in some lakes in Hanoi. The measured results illustrate that the channel is frequency selective for a Barrow band transmission. The Doppler spectrum can be obtained by taking the Fourier transform of the time correlation of the measured channel transfer function. We have shown that, the theoretical maximum Doppler frequency fits well to that one obtained from measurement results.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 375-383
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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