Thematische Bibliographien / Metoda FDM

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Auswahl der wissenschaftlichen Literatur zum Thema „Metoda FDM“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 27. April 2022

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Zeitschriftenartikel zum Thema "Metoda FDM"

Makucha, Anna. „DSI method in study of elements made by fused deposition modelling (FDM) Metoda DSI w badaniu elementów wytworzonych w technologii wytłocznego osadzania przetopionego materiału (FDM)“. PRZEMYSŁ CHEMICZNY 1, Nr. 1 (05.01.2016): 86–90. http://dx.doi.org/10.15199/62.2016.1.13.

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Gębura, Andrzej, und Tomasz Tokarski. „Metody FDM-A i FAM-C W Wykrywaniu I Monitorowaniu Silnie Zaciśniętych Łożysk Tocznych“. Research Works of Air Force Institute of Technology 23, Nr. 1 (01.01.2008): 223–36. http://dx.doi.org/10.2478/v10041-009-0002-1.

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Metody FDM-A i FAM-C W Wykrywaniu I Monitorowaniu Silnie Zaciśniętych Łożysk TocznychW artykule przedstawiono badania eksploatacyjne z zastosowaniem metod diagnostycznych opartych na wykorzystaniu analizy modulacji częstotliwości prądnic FDM-A i FAM-C. Metod tych użyto do wykrywania i monitorowania ruchu zbyt silnie zaciśniętych łożysk tocznych w węzłach łożyskowych silników turboodrzutowych. Szczególną uwagę poświęcono obserwacji ruchu tocznego poszczególnych elementów tocznych oraz płynności ruchu koszyka. W wyniku wykonanych badań i diagnoz stwierdzono, że z chwilą powstania zbyt silnego zacisku pierwszym i najważniejszym skutkiem, obserwowanym metodą FDM-A, jest względne zróżnicowanie stochastyczne płynności ruchu poszczególnych elementów tocznych. W wymienionej metodzie zjawisko to obserwowane jest jako niestabilność szerokości pasma zbioru charakterystycznego danego łożyska tocznego.

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Blicharz, Bartosz, Maciej Cader und Piotr Hermanowicz. „Production of mechanisms using FDM technology“. Mechanik, Nr. 7 (Juli 2015): 556/37–556/44. http://dx.doi.org/10.17814/mechanik.2015.7.211.

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Parafiniak, Maciej. „Experimental testing of mechanical properties of 3D FDM printed material using optical, non-contact displacement measurement technology“. Mechanik, Nr. 12 (Dezember 2016): 1852–55. http://dx.doi.org/10.17814/mechanik.2016.12.578.

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Gębura, Andrzej, und Janusz Szymczak. „Wybrane Aspekty Zużywania Się Połączeń Wpustowych I Wielowypustowych W Procesie Eksploatacji“. Research Works of Air Force Institute of Technology 35, Nr. 1 (01.12.2014): 67–84. http://dx.doi.org/10.1515/afit-2015-0005.

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Abstract W artykule przedstawiono wybrane wady połączeń wielowypustowych: mimośrodowości, przekoszenia, zwiększonych luzów. Przedstawiono znaczenie tych wad dla poprawności funkcjonowania całego zespołu napędowego. Zaprezentowano swoisty katalog tych wad w formie: wizualnego zużycia, pomiarów mechanicznych płaszczyzn przyporu, opisu matematycznego przebiegów dynamiki ruchu takiego połączenia, zobrazowań dla metod FAM-C i FDM-A. Zaznaczono skutki długotrwałej eksploatacji połączeń wielowypustowych o nadmiernym zużyciu dla bezpieczeństwa latania

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Kurdelski, Marcin, und Andrzej Gębura. „Diagnozowanie tarcz sterujących śmigłowców Mi-17 i Mi-24 metodą FAM-C“. Research Works of Air Force Institute of Technology 33, Nr. 1 (01.01.2013): 95–125. http://dx.doi.org/10.2478/afit-2013-0007.

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Streszczenie W publikacji przedstawiono wybrane problemy eksploatacyjne tarcz sterujących śmigłowców eksploatowanych w lotnictwie Sił Zbrojnych RP. Przedstawiono również prognozy zagrożeń dla zespołu transmisji tego śmigłowca, opartej na analizie teoretycznej zjawisk mechanicznych, jak również analizie statystycznej i diagnostycznej. Główną uwagę zwrócono na możliwości diagnozowania miejsc zagrożeń w tarczy sterującej śmigłowca nieinwazyjną metodą FAM-C, opracowaną w ITWL. Metoda ta jest oparta na śledzeniu parametrów modulacji częstotliwości generowanych przez prądnicę pokładową prądu przemiennego. Badanie to nie wymaga instalowania żadnych dodatkowych czujników, gdyż podczas pomiaru zespół transmisji nie doznaje żadnych dodatkowych obciążeń ani zniekształceń prędkości obrotowej. Autorzy w publikacji zaprezentowali wstępne wyniki pomiarów diagnostycznych oraz materiały z demontażu tarcz sterujących śmigłowców eksploatowanych w warunkach misji wojskowych w Iraku i Afganistanie, wykonanego na śmigłowcach Mi-24 oraz Mi-17. Zaproponowano także, zdaniem autorów, prostą i tanią metodę polowego sprawdzania łożyska głównego tarczy sterującej metodą pomiaru fotogrametrycznego. Autorzy wykazali, że metodologię badań diagnostycznych można i trzeba rozciągnąć na inne typy śmigłowców

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LEWITOWICZ, Jerzy. „Badanie rezonansów lokalnych i złożonych w lotniczych zespołach napędowych z wykorzystaniem metod FAM-C i FDM-A“. PRZEGLĄD ELEKTROTECHNICZNY 1, Nr. 11 (05.11.2019): 61–64. http://dx.doi.org/10.15199/48.2019.11.15.

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ZAIN, F. MUHAMMAD, M. GARDA KHADAFI und P. H. GUNAWAN. „ANALISIS KONVERGENSI METODE BEDA HINGGA DALAM MENGHAMPIRI PERSAMAAN DIFUSI“. E-Jurnal Matematika 7, Nr. 1 (03.02.2018): 1. http://dx.doi.org/10.24843/mtk.2018.v07.i01.p176.

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The diffusion equation or known as heat equation is a parabolic and linear type of partial differential equation. One of the numerical method to approximate the solution of diffusion equations is Finite Difference Method (FDM). In this study, the analysis of numerical convergence of FDM to the solution of diffusion equation is discussed. The analytical solution of diffusion equation is given by the separation of variables approach. Here, the result show the convergence of rate the numerical method is approximately approach 2. This result is in a good agreement with the spatial error from Taylor expansion of spatial second derivative.

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Sulaeman, Enceng, Yaya Sulaeman und Asep Yudi Hercuadi. „Desain dan Implementasi Duplekser dengan Metoda Pseudo-Interdigital untuk Uplink dan Downlink LTE“. Jurnal Elektronika dan Telekomunikasi 13, Nr. 2 (29.06.2016): 73. http://dx.doi.org/10.14203/jet.v13.73-80.

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Duplekser merupakan perangkat yang dapat mengisolasi receiver dari transmitter saat keduanya saling berbagi antena yang sama, digunakan agar komunikasi bisa berjalan secara full duplex. Ada dua metode transmisi duplex yaitu frequency division duplex (FDD) dan time division duplex (TDD). FDD merupakan teknik duplex yang menggunakan dua frekuensi yang berbeda untuk melakukan komunikasi dalam dua arah, sedangkan TDD menggunakan frekuensi tunggal dan frekuensi tersebut digunakan oleh semua kanal untuk melakukan pengiriman dan penerimaan data. Gabungan dua bandpass filter dengan metoda pseudo-interdigital untuk aplikasi LTE (long term evolution). Metode ini lebih unggul dibandingkan duplekser dengan metoda hybrid. Duplekser bekerja pada FDD LTE band ke-7 yaitu frekuensi uplink 2500-2570 MHz dan downlink 2620-2690 MHz. Dari hasil pengukuran diperoleh sebagai berikut: nilai frekuensi center pada uplink 2639 MHz dan pada downlink 2659 MHz, insertion loss pada uplink 1,561 dB dan downlink 1,74 dB, bandwidth ±70 MHz, isolasi 23,03 dB, serta nilai return loss 23,5 dB pada uplink dan downlink 23,45 dB.

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Skawiński, Piotr, Przemysław Siemiński und Piotr Błazucki. „Applications of additive manufacturing (FDM method) in the manufacturing of gear“. Mechanik, Nr. 12 (Dezember 2015): 976/173–976/179. http://dx.doi.org/10.17814/mechanik.2015.12.582.

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Dissertationen zum Thema "Metoda FDM"

Strnad, Jiří. „Návrh malé multifunkční modelářské CNC frézky“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444277.

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This diploma thesis deals with the construction proposal of a small multifunctional modeller CNC milling machine that enables milling of aluminium alloys and 3D printing using the FDM method. Based on the research, analyzes and defined entry requirements the construction proposal is created and verified by calculations. The thesis contains a description of all the construction parts including the printhead, the tool tray and the safety cover. The other part of the thesis describes the machine geometry adjustment and specifies the choice of control system. The thesis includes a 3D model and the drawing documentation of selected structural nodes.

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Quan, Liang. „Using FDM and FEM to simulate the decarburization in AISI 1074 during heat processing and its impact“. Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44769.

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The metallurgical processes and the products developed from these processes have been the cornerstone on which our civilizations have developed and flourished. Many of the new materials that have been developed over centuries were often the result of serendipitous occurrences. Because of the importance of new materials to the improvement of society, it is necessary to accelerate the way in which new alloys and processes are designed, developed and implemented. Over the last two decades the computational side of materials science has thrived as a result of bigger and faster computers. However, the application of new computational methods to the development of new materials and structures is still in the early stages primarily because of the complexity of most metallurgical processes. One such process is the decarburization of steel. Because of the importance of the microstructure on the mechanical properties, changes in the near surface properties are affected by the loss of carbon in the alloy. The topics investigated in this thesis include a variety of alloys and microstructures that are considered to be important in the development of a unique structure necessary for a more efficient method of recovering natural gas and oil from underground reserves as well as structures for energy absorbing systems. Since both the material application and the structure are new, this research represents an ideal opportunity to combine processing, properties, microstructure and computations to accelerate the development of these new structures. Compared to other commercially available proppants which tend to fail in demanding environments, the thin-walled hollow metal proppants are regarded more promising due to the low density and high mechanical strength. The energy-absorbing composite material manufactured by embedding said spheres in the Mg/Al matrix material is optimized by improving sphere and matrix properties at each step in the process. Ultimately the mechanical strength, fracture toughness, and energy absorption are expected to achieve a factor of 2-5 higher than previously reported. Modeling makes it economically practical to assess the targeted materials' overall properties, behaviors and the mechanical responses in conjunction with stress environment, material properties, material dimensions among other variables, before a structure is built. Additionally, more advanced modeling can enable the quantitative descriptions of more complex metallurgical phenomena such as the effects of impurity elements and deformation under complex loading conditions.

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Dostál, Tomáš. „Návrh ražby a primárního ostění tunelu na stavbě vysokorychlostního železničního spojení“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409747.

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As part of modernization of the Brno-Přerov railway line, is in the section between village Blažovice and town Vyškov desined tunnel composed of two monorail tubes about 640 meters length. Tubes are situated in neogenic clay with an overburden height of 11 meters. This master thesis deals with design suitable tunnel exavation, primary lining with static calculation and geotechnical monitoring.

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Kosour, Vojtěch. „Technologie rychlého prototypování za použití metody FDM a současně technologie vytavitelného modelu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228152.

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An overview of the development of the Investment Casting market and Rapid Prototyping equipment is given in the introductory part of this diploma thesis. Basic methods of rapid prototyping and the FDM method are futher described in detail. The FDM method is consequently used in the practical part of this work for the preparation of the silicon mould. The largest part deals with the issue of the simulation of pouring process of wax into the silicon mould. A characteristics of the casting wax is made; the parametres, which are inserted into the simulation software ProCAST and the possibilities of their measurement are described. The process of the simulation of the mould filling and its validation with the real filling process are described in detail.

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Smrčka, Václav. „Technologie rychlého prototypování za použití metody FDM a současně technologie vytavitelného modelu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228153.

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Determining accuracy of wax patterns is an important in wide implementing rapid prototyping methods in investment casting. This experiment is comparing wax pattern accuracy produced in classical metal die and silicone mould. It has been found out, that wax patterns produced by the silicone mould are ounly about one or two accuracy steps worse then wax patterns produced by classical metal die.

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Kleditzsch, Stefan, und Birgit Awiszus. „Modeling of Cylindrical Flow Forming Processes with Numerical and Elementary Methods“. Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-97124.

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With flow forming – an incremental forming process – the final geometry of a component is achieved by a multitude of minor sequential forming steps. Due to this incremental characteristic associated with the variable application of the tools and kinematic shape forming, it is mainly suitable for small and medium quantities. For the extensive use of the process it is necessary to have appropriate simulation tools. While the Finite-Element-Analysis (FEA) is an acknowledged simulation tool for the modeling and optimization of forming technology, the use of FEA for the incremental forming processes is associated with very long computation times. For this reason a simulation method called FloSim, based on the upper bound method, was developed for cylindrical flow forming processes at the Chair of Virtual Production Engineering, which allows the simulation of the process within a few minutes. This method was improved by the work presented with the possibility of geometry computation during the process.

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Beuchler, Sven. „Wavelet preconditioners for the p-version of the fem“. Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600607.

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In this paper, we consider domain decomposition preconditioners for a system of linear algebraic equations arising from the p-version of the fem. We propose several multi-level preconditioners for the Dirichlet problems in the sub-domains in two and three dimensions. It is proved that the condition number of the preconditioned system is bounded by a constant independent of the polynomial degree. The proof uses interpretations of the p-version element stiffness matrix and mass matrix on [-1,1] as h-version stiffness matrix and weighted mass matrix. The analysis requires wavelet methods.

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Eibner, Tino, und Jens Markus Melenk. „A local error analysis of the boundary concentrated FEM“. Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601440.

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The boundary concentrated finite element method is a variant of the hp-version of the FEM that is particularly suited for the numerical treatment of elliptic boundary value problems with smooth coefficients and boundary conditions with low regularity or non-smooth geometries. In this paper we consider the case of the discretization of a Dirichlet problem with exact solution $u \in H^{1+\delta}(\Omega)$ and investigate the local error in various norms. We show that for a $\beta > 0$ these norms behave as $O(N^{−\delta−\beta})$, where $N$ denotes the dimension of the underlying finite element space. Furthermore, we present a new Gauss-Lobatto based interpolation operator that is adapted to the case non-uniform polynomial degree distributions.

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Karlsson, Christian. „A comparison of two multilevel Schur preconditioners for adaptive FEM“. Thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-219939.

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There are several algorithms for solving the linear system of equations that arise from the finite element method with linear or near-linear computational complexity. One way is to find an approximation of the stiffness matrix that is such that it can be used in a preconditioned conjugate residual method, that is, a preconditioner to the stiffness matrix. We have studied two preconditioners for the conjugate residual method, both based on writing the stiffness matrix in block form, factorising it and then approximating the Schur complement block to get a preconditioner. We have studied the stationary reaction-diffusion-advection equation in two dimensions. The mesh is refined adaptively, giving a hierarchy of meshes. In the first method the Schur complement is approximated by the stiffness matrix at one coarser level of the mesh, in the second method it is approximated as the assembly of local Schur complements corresponding to macro triangles. For two levels the theoretical bound of the condition number is 1/(1-C²) for either method, where C is the Cauchy-Bunyakovsky-Schwarz constant. For multiple levels there is less theory. For the first method it is known that the condition number of the preconditioned stiffness matrix is O(l²), where l is the number of levels of the preconditioner, or, equivalently, the number mesh refinements. For the second method the asymptotic behaviour is not known theoretically. In neither case is the dependency of the condition number of C known. We have tested both methods on several problems and found the first method to always give a better condition number, except for very few levels. For all tested problems, using the first method it seems that the condition number is O(l), in fact it is typically not larger than Cl. For the second method the growth seems to be superlinear.

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Churý, Tomáš. „Stanovení modálních charakteristik celokompozitového křídla s využitím MKP metod“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232093.

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The diploma thesis deals with the creation of a detail FEM model all-composite wing of glider. Reduction created FEM model of the beam model. The models are calculated natural frequencies, vibration shapes wings and then subsequently compared the results of analyzes of both models.

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Bücher zum Thema "Metoda FDM"

Nakahashi, Kazuhiro. FDM-FEM zonal method for viscous flow computations over multiple-bodies. Tokyo: National Aerospace Laboratory, 1987.

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Kurlyandskaya, G. L.N. Tolstoi i F.M. Dostoevskii: Problema metoda i mirovozzreniya pisatelei. Tula: Priokskoe knizhnoe izd-vo, 1986.

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John, Robinson. Early FEM pioneers. Wimbourne, Eng: Robinson and Associates, 1985.

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Institut mirovoĭ literatury imeni A.M. Gorʹkogo. Komissii︠a︡ po izuchenii︠u︡ tvorchestva F.M. Dostoevskogo., Hrsg. "Soznatʹ i skazatʹ": "Realizm v vysshem smysle" kak tvorcheskiĭ metod F.M. Dostoevskogo. Moskva: Raritet, 2005.

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Matthias, Kraus, Hrsg. Steel structures: Design using FEM. Berlin: Wilhelm Ernst & Sohn, 2011.

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Blaauwendraad, J. Plates and FEM: Surprises and Pitfalls. Dordrecht: Springer Science+Business Media B.V., 2010.

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Applied metal forming: Using FEM analysis. Cambridge: Cambridge University Press, 2010.

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Rolf, Steinbuch. Simulation im konstruktiven Maschinenbau: Anwendung von FEM- und verwandten Systemen in der Konstruktion. München: Fachbuchverlag Leipzig im Carl Hanser Verlag, 2004.

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Löhner, Rainald. Finite element flux-corrected transport (FEM-FCT) for the Euler and Navier-Stokes equations. Hampton, Va: ICASE, 1987.

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Klein, Bernd. FEM: Grundlagen und Anwendungen der Finite-Element-Methode im Maschinen- und Fahrzeugbau : mit 12 Fallstudien und 20 U bungsaufgaben. 8. Aufl. Wiesbaden: Vieweg + Teubner, 2010.

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Buchteile zum Thema "Metoda FDM"

Beilina, L., und C. Johnsson. „Hybrid FEM/FDM method for an inverse scattering problem“. In Numerical Mathematics and Advanced Applications, 545–56. Milano: Springer Milan, 2003. http://dx.doi.org/10.1007/978-88-470-2089-4_51.

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Klein, Bernd. „Grundlagen der Nichtlinearen Finiten-Element-Methode“. In FEM, 226–38. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-85604-3_10.

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Klein, Bernd. „Grundgleichungen der Linearen Finite-Element-Methode“. In FEM, 11–32. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-85604-3_3.

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Klein, Bernd. „Das Konzept der Finite-Element-Methode“. In FEM, 42–89. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-85604-3_5.

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Klein, Bernd. „Grundgleichungen der nichtlinearen Finite-Element-Methode“. In FEM, 247–65. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-8348-9100-6_10.

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Klein, Bernd. „Grundgleichungen der linearen Finite-Element-Methode“. In FEM, 16–33. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-8348-9100-6_3.

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Klein, Bernd. „Das Konzept der Finite-Element-Methode“. In FEM, 41–88. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-8348-9100-6_5.

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Klein, Bernd. „Grundgleichungen der nichtlinearen Finite-Element-Methode“. In FEM, 223–40. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-92856-6_10.

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Klein, Bernd. „Grundgleichungen der linearen Finite-Element-Methode“. In FEM, 12–28. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-92856-6_3.

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Klein, Bernd. „Das Konzept der Finite-Element-Methode“. In FEM, 36–76. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-92856-6_5.

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Konferenzberichte zum Thema "Metoda FDM"

Fernando, Greshan. „Hybrid Numerical Method for Heat Transfer Analysis of Complex 3D Geometries“. In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33085.

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The heat transfer analysis of systems with complex 3D geometries is usually done by numerical methods. Finite Element Method (FEM) and Finite Difference Methods (FDM) are widely used for this purpose. Complex geometries are accurately analyzed by FEM method. However, FEM solutions can be computationally inefficient for thermal problems that have high mesh densities with complex boundary conditions and variable material properties. On the other hand, Finite Difference method (FDM) is difficult to apply for complex geometric shapes. A hybrid numerical approach that combines the advantages of FDM and FEM has been integrated into a thermal simulation code. The hybrid technique has been implemented using object oriented programming techniques in a PC environment. A comparison of the computational efficiency of the two methods has been presented.

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Hu, Changhong, Kangping Liao und Wengyang Duan. „VIV Simulation of 2-D Deformable Cylinder Using Coupled FDM/FEM Method“. In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83641.

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In this work a coupled finite difference method and finite element method (FDM/FEM) is developed for numerical simulation of vortex induced vibration (VIV) phenomenon with an elastically deformable circular cylinder. The algorithm is based on a FDM with CIP (Constraint Interpolation Profile) method to fluid dynamics and a FEM to solve structural dynamics. Coupling between FDM and FEM is realized by BGS (Block Gauss-Seidel) procedure. IB (Immersed Boundary) method is applied for data transferring on the interface between fluid and structure. In this paper, numerical simulations of a 2-D circular cylinder at low Reynolds number are carried out. The effect of stiffness of the cylinder shell on the vortex shedding is investigated.

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Liu, Qiang, Lan Kang, F. Barlat, Y. H. Moon und M. G. Lee. „Springback Compensation Based on FDM-DTF Method“. In NUMIFORM 2010: Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming Processes Dedicated to Professor O. C. Zienkiewicz (1921–2009). AIP, 2010. http://dx.doi.org/10.1063/1.3457526.

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Lee, Yoonhee, Nam Zin Cho und Sun Kyo Chung. „Single-Channel Thermal Analysis of Fully Ceramic Microencapsulated Fuel via Two-Temperature Homogenized Model“. In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30072.

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The fully ceramic microencapsulated (FCM) fuel, one of the accident tolerant fuel (ATF) concepts, consists of TRISO particles randomly dispersed in SiC matrix. This high heterogeneity in compositions leads to difficulty in explicit thermal calculation of such a fuel. For thermal analysis of a fuel element in very high temperature reactors (VHTRs) which has a similar configuration to the FCM fuel, a two-temperature homogenized model was proposed by the authors. The model was developed using particle transport Monte Carlo method for heat conduction problems. It gives more realistic temperature profiles and provides the fuel-kernel and graphite temperatures separately. In this paper, we apply the two-temperature homogenized model to single-channel thermal analysis of the FCM fuel element for steady- and transient-states using 2-D FEM/1-D FDM hybrid method. The results of analyses are compared to those of conventional UO2 fuel having the same geometric dimension and operating conditions.

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Cui, Weiwei, und Zhigang Cao. „FDM array based dual channel speech enhancement method“. In 2008 9th International Conference on Signal Processing (ICSP 2008). IEEE, 2008. http://dx.doi.org/10.1109/icosp.2008.4697150.

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Jaworska, Irena. „On the error analysis of the meshless FDM and its multipoint extension“. In COMPUTER METHODS IN MECHANICS (CMM2017): Proceedings of the 22nd International Conference on Computer Methods in Mechanics. Author(s), 2018. http://dx.doi.org/10.1063/1.5019053.

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Amare, Rohan, Amir A. Bahadori und Steven Eckels. „Modeling Heat Regulation With a Structured Mesh, Finite Volume Approach in a Voxelized Domain“. In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88036.

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Modeling human thermal behavior is important for applications involving medical device design, non-ionizing radiation dosimetry, and human comfort. Most thermal models use the finite element method (FEM) to represent the complicated domain structure. With the FEM, challenges in mesh and equation derivation limit rapid implementation. Finite difference (FDM) and finite volume (FVM) methods are alternatives to the FEM but have their own limitations. The FDM faces challenges in discontinuous domains at the boundaries. The FVM provides a possible solution to problems faced with FDM and FEM use. In a computational human phantom generated from medical imaging data, the finite volume structure is readily available in the form of two-dimensional pixels and three-dimensional voxels. However, geometric characteristics of rectangular prisms prevent acceptable surface-area convergence for curved surfaces, introducing an error that substantially impacts boundaries between regions such as a convection interface. The present work focuses on developing surface-area corrections for a domain generated from computed tomography scans. These geometric corrections are coupled with an FVM heat-transfer solution on a structured mesh. Solutions are demonstrated for thermoregulation in a domain similar to a section of the human forearm. The ultimate goal of this work is to evaluate human body temperature distributions under the influence of external stimuli and internal heat generation.

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Dvorak, Karel. „3D model preparing for rapid prototyping by FDM method“. In 2017 8th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE, 2017. http://dx.doi.org/10.1109/icmae.2017.8038611.

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Ghannam, Hedaia, und Izzat Darwazeh. „Robust Channel Estimation Methods for Spectrally Efficient FDM Systems“. In 2018 IEEE 87th Vehicular Technology Conference (VTC Spring). IEEE, 2018. http://dx.doi.org/10.1109/vtcspring.2018.8417823.

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Zhang, Yaqi, und Vadim Shapiro. „Linear Time Thermal Simulation of FDM Process“. In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68293.

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Like many other additive manufacturing processes, FDM process is driven by a moving heat source, and temperature history plays an important role in determining the mechanical properties and geometry of the final parts. Thermal simulation of FDM is challenging due to geometric complexity of manufacturing process and inherent computational complexity which requires numerical solution at every time increment of the process. we describe a new approach to thermal simulation of the FDM process, formulated as an explicit finite difference method that is applied directly on as-manufactured model described by a typical manufacturing process plan. The thermal model accounts for most relevant thermal effects including heat convection and radiation to the environment, heat conduction with build platform and between adjacent roads (and adjacent layers). We show that the proposed simulation method achieves linear time complexity. This implies that the simulation not only scales to handle 3D printed components of arbitrary complexity but also can achieve real-time performance.

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Berichte der Organisationen zum Thema "Metoda FDM"

Zheng, Jinhui, Matteo Ciantia und Jonathan Knappett. On the efficiency of coupled discrete-continuum modelling analyses of cemented materials. University of Dundee, Dezember 2021. http://dx.doi.org/10.20933/100001236.

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Computational load of discrete element modelling (DEM) simulations is known to increase with the number of particles. To improve the computational efficiency hybrid methods using continuous elements in the far-field, have been developed to decrease the number of discrete particles required for the model. In the present work, the performance of using such coupling methods is investigated. In particular, the coupled wall method, known as the “wall-zone” method when coupling DEM and the continuum Finite Differences Method (FDM) using the Itasca commercial codes PFC and FLAC respectively, is here analysed. To determine the accuracy and the efficiency of such a coupling approach, 3-point bending tests of cemented materials are simulated numerically. To validate the coupling accuracy first the elastic response of the beam is considered. The advantage of employing such a coupling method is then investigated by loading the beam until failure. Finally, comparing the results between DEM, DEM-FDM coupled and FDM models, the advantages and disadvantages of each method are outlined.

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MATTHAI, Stephan K., Julian MINDEL und Hamidreza MAGHAMI-NICK. A Hybrid (FEM - Node-Centered FVM) Method with Special Treatment of Wells and Material Discontinuitues for Fast and Spatially Adaptive Simulation of Coupled Reservoir Processes. Cogeo@oeaw-giscience, September 2011. http://dx.doi.org/10.5242/iamg.2011.0160.

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Dolbow, John, Ziyu Zhang, Benjamin Spencer und Wen Jiang. Fracture Capabilities in Grizzly with the extended Finite Element Method (X-FEM). Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1244633.

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Gumerov, Nail A., und Ramani Duraiswami. Efficient FMM Accelerated Vortex Methods in Three Dimensions via the Lamb-Helmholtz Decomposition. Fort Belvoir, VA: Defense Technical Information Center, Januar 2012. http://dx.doi.org/10.21236/ada560003.

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Vorobiev, O. Simple Common Plane contact algorithm for explicit FE/FD methods. Office of Scientific and Technical Information (OSTI), Dezember 2006. http://dx.doi.org/10.2172/899442.

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Morris, Kristen D., Michelle Teti, Cole Young und Abigail Rolbiecki. Photovoice: A user-centered design method to understand apparel needs of Female to Male (FTM) in gender identity and expression. Ames: Iowa State University, Digital Repository, 2017. http://dx.doi.org/10.31274/itaa_proceedings-180814-427.

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Liu, Yuzhou, Yang Zhang, Zhijia Zhang, Qiang Fu, Yin Fu, Zhixiang Li, Chenyu Zhang und Xiaoyu Wang. Efficacy of Li-Zhong Decoction in the treatment of patients with functional dyspepsia: A protocol for systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2022. http://dx.doi.org/10.37766/inplasy2022.4.0029.

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Review question / Objective: To evaluate the safety and efficacy of LZD in the treatment of FD. In this study, all theory is adopted the soup randomized controlled trials for the treatment of functional dyspepsia. Condition being studied: Although the disease is not life-threatening, it can take a psychological and financial toll on sufferers. At present, the efficacy of conventional treatment is not significant. Previous studies have shown that Lizhong decoction is safe and effective, but there is a lack of systematic evaluation. The purpose of this study was to systematically study the efficacy of LZD in the treatment of FD patients.

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Zhang, Xingyu, Matteo Ciantia, Jonathan Knappett und Anthony Leung. Micromechanical study of potential scale effects in small-scale modelling of sinker tree roots. University of Dundee, Dezember 2021. http://dx.doi.org/10.20933/100001235.

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When testing an 1:N geotechnical structure in the centrifuge, it is desirable to choose a large scale factor (N) that can fit the small-scale model in a model container and avoid unwanted boundary effects, however, this in turn may cause scale effects when the structure is overscaled. This is more significant when it comes to small-scale modelling of sinker root-soil interaction, where root-particle size ratio is much lower. In this study the Distinct Element Method (DEM) is used to investigate this problem. The sinker root of a model root system under axial loading was analysed, with both upward and downward behaviour compared with the Finite Element Method (FEM), where the soil is modelled as a continuum in which case particle-size effects are not taken into consideration. Based on the scaling law, with the same prototype scale and particle size distribution, different scale factors/g-levels were applied to quantify effects of the ratio of root diameter (𝑑𝑟) to mean particle size (𝐷50) on the root rootsoil interaction.

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Zhang, Man, und Hongyu Jin. 18-FDG PET/CT Predicts Microvascular Invasion in HCC with Promising Accuracy: Protocol for A Systematic Review and Meta-Analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2020. http://dx.doi.org/10.37766/inplasy2020.11.0141.

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Li, Shifu, Wengui Tao, Chudai Zeng, Langchao Yan und Fenghua Chen. The safety and efficacy of flow diverter versus conventional endovascular treatment in intracranial aneurysm: a meta-analysis of the real-world cohort studies over last ten years. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, Oktober 2021. http://dx.doi.org/10.37766/inplasy2021.10.0061.

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Review question / Objective: Did adult patients with intracranial aneurysms (patient population) who underwent flow diverter (FD, Intervention) have better clinical outcomes, higher rates of aneurysm occlusion, and lower rates of mortality and procedure related complications (outcomes) when compared with patients who received the conventional endovascular treatments (CEV, control) from January 2010 to December 2020? Eligibility criteria: The inclusion criteria are: 1. directly comparison of FD and conventional endovascular treatment, including coiling alone, stent alone, stent-assisted coiling, and balloon-assisted coiling; 2. patients ≥18 years with intracranial aneurysms; 3. detailed follow up angiographic and clinical outcomes; 4. the number of patients in two groups at least 10 patients. The exclusion criteria are:1. less than 10 participants in either group; 2. without the report of outcome variables; 3. studies primarily focus on children patients; 4. studies primarily focus on one interventional tool.

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