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    Wyświetlanie 1-7 z 7
    Tytuł:
    Calculation reliability of natural vibrations of ship hull and superstructure
    Autorzy:
    Doan, Do Van
    Murawski, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/242824.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    finite element method
    ship hull vibrations
    modal analysis
    Patran-Nastran software
    Opis:
    The ship hull vibration has a great impact on the performance, safety of the devices, structures, and the sailor's comfort when working on the ship. With increases in ship sizes and speeds, shipboard vibration becomes a significant concern in the design and construction of ships. Therefore, designing a ship without any excessive vibration is an important issue and should be studied through analysis right in the design phase. To ensure minimum vibration in a proposed new design; avoid damage to structures, machinery or equipment (mechanically suitable); meeting the requirements of the crew's living environment and working conditions. The ship's natural vibrations are determined to right from the design stage, which will help ship designers and structures avoid dangerous resonance areas. In this study, a three-dimensional finite element model representing the entire ship hull, including the deckhouse and machinery propulsion system, has been developed using numerical modelling implemented in Patran-Nastran software for local and global vibration analyses of the container ship 2000 TEU. Vibration analyses have been conducted under two conditions: free– free (dry) and in-water (wet). The wet analysis has been implemented using Mfluid elements in Nastran software. Because of the global ship free vibration analysis, global natural frequencies and mode shapes have been determined. Combined with the frequency of the main engine and the propeller, the resonant regions with higher frequencies are determined by the resonant graph of the hull. The application of the finite element method for ship vibration analysis shows the optimal of numerical modelling method compared to other traditional methods. This will help other technical problems to be solved with the support of the finite element method.
    Źródło:
    Journal of KONES; 2019, 26, 1; 31-38
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody pomiaru naprężeń z zastosowaniem tensometrii oporowej oraz zaawansowana analiza MES w programie NX Nastran
    Methods of stresses measurement with the help of strain gauges analysis and advanced fem analysis in the NX Nastran program
    Autorzy:
    Górski, M.
    Baier, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/409053.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Śląska
    Tematy:
    analiza MES
    NX Nastran
    naprężenia
    tensometria oporowa
    MES analysis
    stresses
    Opis:
    W artykule przedstawiono metody stosowane do wyznaczania naprężeń w przyjętych miejscach pomiarowych i przy zadanym obciążeniu. Krótko opisano poszczególne etapy każdej z wyżej wymienionych metod oraz efekty końcowe uzyskiwane z zastosowaniem metody tensometrii oporowej, jak i zaawansowanej analizy MES. Wykorzystano oprogramowanie oraz sprzęt firmy HBM: catmanEasy oraz oprogramowanie firmy Siemens PLM Software (Unigraphics NX 6.0).
    In the article methods applied for stresses determination in accepted measurement places and at a given load were presented. The individual stages for each of above mentioned methods and the final results obtained by using strain gauges analysis, as well as advanced FEM analysis were briefly described. A software and an hardware of the HBM company were used: catmanEasy and PLM Siemens Software (Unigraphics NX 6.0).
    Źródło:
    Wybrane Problemy Inżynierskie; 2010, 1; 30-33
    2083-1021
    Pojawia się w:
    Wybrane Problemy Inżynierskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling method of dynamic characteristics of marine thin-walled structure
    Autorzy:
    Doan, Do Van
    Szeleziński, Adam
    Murawski, Lech
    Muc, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/245078.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    thin-walled structure
    vibration
    FEM
    rectangular plate
    Patran-Nastran software
    Opis:
    Thin-walled structures are very popular in industries, especially in the field of shipbuilding. There are many types of equipment and structures of ships, which are made up of thin-walled structures such as hull, deck and superstructure. Therefore, the analysis and understanding of the static and dynamic characteristics of a thin-walled structure are very important. In this article, we focus on vibration analysis of a typical thin-walled structurerectangular plate, a basic structure of the hull. Vibration analysis of a rectangular thin plate is conducted by two methods: numerical modelling method of the finite element on Patran-Nastran software platform and experimental method implemented in the laboratory of Gdynia Maritime University. Thin rectangular plate is fixed one end by four clamping plates and is modelled with finite elements and different meshing densities. The numerical model of thin rectangular plate is divided into four cases. Case 1, thin rectangular plate, and clamping plates are modelled with two-dimensional elements. Case 2, the rectangular thin plate is modelled with two-dimensional elements; the clamping plates are modelled with three-dimensional elements. Case 3, both the rectangular thin plate and clamping plates are modelled with three-dimensional elements. Case 4, the rectangular thin plate, and clamping plates are modelled with three-dimensional elements with larger mesh density to increase the accuracy of the calculation results. After that, the results of vibration analysis according to the numerical modelling method on Patran-Nastran software platform for these cases were compared with the measurement results. From there, assess the accuracy of analysis results of selected numerical model methods and the ability to widely apply this numerical model method to other marine structures
    Źródło:
    Journal of KONES; 2019, 26, 4; 39-46
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat transfer model of a small size satellite on geostationary orbit
    Autorzy:
    Preumont, Philippe
    Szewczyk, Roman
    Wittels, Paweł
    Czubaczyński, Filip
    Powiązania:
    https://bibliotekanauki.pl/articles/950918.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    simplified thermal model
    FEM modelling
    Nastran InCAD
    harmonic gear
    heat transfer
    Opis:
    The purpose of the study is to compute an approached satellite thermal model to be able to estimate the heat transfer and the maximum temperature through the harmonic gear for small size geostationary satellite. We use finite element method using known data with Nastran In-CAD FEM software. The presented results show temperature gradients compatible with experimental information. Though the results are not correlated with dedicated tests, they seems to be in line with what can be found in literature. The paper use these information in dedicated analysis related to impact of temperature gradient in precision mechanism. The second purpose of the study is to show that simplified tools and methods allows to reach results sufficient for preliminary analysis. The space business is changing fast with growing private companies that are challenging conservative space standards. A simplified analysis allowing to reduce cost and increase competitiveness is presented.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2019, 13, 3; 14-26
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of msc adams – X Nastran/Femap interface in strength calculations of truck frames
    Autorzy:
    Przemyk, A.
    Harlecki, A.
    Gancarczyk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951506.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    truck
    frame
    dynamics
    FEM
    MSC ADAMS
    NX Nastran
    Femap
    ciężarówka
    rama
    dynamika
    MSC Adams
    Opis:
    In this paper, the finite element method (FEM) is used to calculate the strength of truck frames by integrating the MSC Adams software, for dynamics analysis of mechanical systems, and the NX Nastran/Femap software. At the same time, a method for reducing degrees of freedom is been developed based on the Craig–Bampton method. The interface is applied in order to calculate the strength of the frame in the selected truck, which runs on the test track. The selected model of truck can be treated as the virtual prototype that is useful in the design process.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2016, 91; 113-123
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the process of metal hardness measurement by the rockwell method
    Autorzy:
    Berczyński, S.
    Grochała, D.
    Grządziel, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315843.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    metal hardness
    Rockwell method
    finite elements method
    Nastran FX 2010
    elastic strains
    twardość metali
    metoda Rockwella
    metoda elementów skończonych
    odkształcenia sprężyste
    Opis:
    The article presents a simulation of metal hardness determination by the Rockwell method. The authors describe a physical model of an indenter and the examined sample built by means of the Nastran FX 2010 program using the finite elements method. The modelling included subsequent stages of indenter loads that follow the procedure used in the method. The verifying calculations were made for the results of C45 steel hardness of approx. 20 HRC. Two methods of hardness measurements were analyzed. A diamond cone was used as an indenting tool in one method, a steel ball in the other. As a result of calculations, spatial maps of elastic and plastic strains and stresses were obtained throughout the process. The hardness results obtained from computer simulations and those from experiments involving C45 steel are similar. metal hardness, Rockwell method, finite elements method, Nastran FX 2010, elastic strains twardość metalu, metoda Rockwella, metoda elementów skończonych, Nastran FX 2010, odkształcenia sprężyste
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 647-654
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie programów bazujących na metodzie elementów skończonych do nauczania projektowania złożonych i wielkogabarytowych konstrukcji cienkościennych
    The application of finite element method software to the teaching of designing of complex and large-scale thin-walled structures
    Autorzy:
    Murawski, L.
    Muc, A.
    Szeleziński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/266331.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    projektowanie
    metoda elementów skończonych
    symulacja
    Patran
    Nastran
    konstrukcja wielkogabarytowa
    konstrukcje złożone
    engineering design
    finite element method
    computer simulation
    large-scale structure
    thin walled structures
    Opis:
    W artykule przeprowadzono ocenę oprogramowania wykorzystywanego do nauki projektowania złożonych i wielkogabarytowych konstrukcji cienkościennych. Większość oferowanych środowisk graficznych umożliwia zamodelowanie struktury przestrzennej obiektu i przeprowadzenie badań symulacyjnych obejmujących np.: analizę wytrzymałościową i statyczną, obliczenia drgań własnych i wymuszonych. Moduł obliczeniowy w tego typu programach bazuje na metodzie elementów skończonych. W pracy zamieszczono przykładową ścieżkę projektową i analizę pokładu okrętu typu RO-RO, na którym zaparkował samochód ciężarowy. W przedstawionym przykładzie wykorzystano oprogramowanie firmy MSC z preprocesorem Patran i modułem obliczeniowym Nastran.
    In the paper the software to the teaching of designing of complex and large-scale thin-walled structures was evaluated by the authors. The bundle of MSC software, named Patran-Nastran, was presented. The software is based on Finite Element Method. The authors, during the teaching process, focus on basic analyses: linear static strength analysis, normal mode (eigenvectors) analysis and frequency response analysis (forced vibrations calculations). An example of RO-RO ship's deck analysis was presented. The deck was loaded with the wheels of truck. A short description of the modeling process as well as the results of the analyses are presented in the paper. Discussion about objectives of the teaching process was carried out. In the authors' opinion, knowledge of that very specialized software is important not only for a calculating engineer. All mechanical engineers should have basic knowledge about the calculations process because they will be recipients of the calculations performed during structure designing. Thin-walled structures are very useful for teaching because during the structure modeling we have to choose types of FEM elements. Stiffeners may be modeled by 1-D elements (with offset) and the plates should be modeled by 2D elements. Differences between beam and rod 1D elements as well as shell, plate and membrane 2D elements should be stressed during the teaching process.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 52; 93-98
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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