BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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66 Marius Catană and Daniela Tarniţă Kazemi M., Li L.P., Savard P., Buschmann M.D., Creep Behavior of the Intact and Meniscectomy Knee Joints. Journal of the Mechanical Behavior of Biomedical Materials, 2011. Kubicek M., Zdenek F., Stress Strain Analysis of Knee Joint. Engineering Mechanics, 16, 5, 315-322 (2009). Radu C., Automatic Reconstruction of 3D CAD Models from Tomographic Slices Via Rapid Prototyping Technology, 10th International Research/Expert Conference Trends in the Development of Machinery and Associated Technology TMT 2006, Barcelona-Lloret de Mar, Spain. Sandholm A., Schwartz C., Pronost N., Zee M., Voigt M., Thalmann D., Evaluation of a Geometry-based Knee Joint Compared to a Planar Knee Joint. Virtual Reality Lab., École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, 2011. Tarniţǎ D., Popa D., Dumitru N., Tarniţǎ D.N., Marcuşanu V., Berceanu C., Numerical Simulations of the Human Knee Joint. Springer Publishing House, 2010, pp. 309- 317. Tarniţǎ, D., Tarniţǎ, D. N., Bizdoacǎ, N., Popa D., Considerations on the Dynamic Simulation of the Virtual Model of the Human Knee Joint. “Materialwissenschaft und Werkstofftechnik”, Materials Science and Engineering Technology, Special Edition Biomaterials, 40, 73-81 (2009). Vidal-Lesso A., Ledesma O., Lesso A.R, Rodríguez C., Dynamic Response of Femoral Cartilage in Knees with Unicompartmental Osteoarthritis. Journal of Applied Research and Technology, 9, 2, 173-187 (2011). Weiss .J.A., Gardiner J.C., Computational Modeling of Ligament Mechanics. Critical Reviews in Biomedical Engineering, 29, 4, 1-70 (2001). ANALIZA STATICǍ A ARTICULAŢIEI GENUNCHIULUI UMAN FOLOSIND MEF (Rezumat) Articolul îşi propune sǎ prezinte o analizǎ staticǎ neliniară pentru modelul geometric complex al articulaţiei genunchiului uman. Modelul vitrtual al articulaţiei genunchiului cuprinde urmǎtoarele componente: femurul, tibia, peroneul, cartilajele oaselor, meniscurile, ligamentul încrucişat anterior (LIA), ligamentul încrucişat posterior (LIP), ligamentul colateral lateral (LCL) şi ligamentul colateral medial (LCM). Sunt prezentate condiţiile în care are loc simularea, condiţiile la limitǎ, caracteristicile de material. Întregul model este solicitat prin aplicarea unei sarcini de 800N (80kg - poziţie stat într-un picior). Sunt prezentate rezultatele obţinute: tensiunile maxime echivalente, deformaţiile şi deplasǎrile pe întreg modelul dar şi pe componente individuale. Modificǎrile geometrice şi poziţionarea corectǎ a componentelor s-a fǎcut cu ajutorul pachetului Ansys Workbench 14.0, soft CAE ce permite o modelare rapidǎ, o punere în evidenţǎ şi control al problemelor geometrice ce apar în zona de contact. Poziţionarea necesitǎ o plasare realǎ a componentelor, o distanţǎ corectǎ între acestea precum şi o structurǎ geometricǎ corectǎ. Este evidenţiatǎ şi discretizarea modelului geometric în model de noduri şi elemente. S-au folosit comenzi pentru discretizare localǎ mai finǎ, necesarǎ în zona de contact şi zona de interes (zona de contact tibiefemur-menisc). Prin prezenţa contactului neliniar analiza prezentatǎ este static neliniarǎ.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVIII (LXII), Fasc. 3, 2012 Secţia MATEMATICĂ. MECANICĂ TEORETICĂ. FIZICĂ STUDY OF A SINGLE TUBE BOREHOLE THERMAL ENERGY STORAGE BY MEANS OF AN IMPLICIT FINITE DIFFERENCE METHOD BY BOGDAN HORBANIUC ∗ , GHEORGHE DUMITRAŞCU and MIHAI ADAM ”Gheorghe Asachi” Technical University of Iaşi, Department of Mechanical and Automotive Engineering Received: May 20, 2012 Accepted for publication: June 30, 2012 Abstract. The paper deals with the problem of storing heat provided by a solar system for the periods when solar energy is not available. In order to level the primary energy curve so as to secure a quasi constant energy supply, a thermal storage is mandatory. One of the multiple options is to store heat in the ground and extract it when necessary. The solution studied in the paper consists of transporting heat to and from the heat storage represented by the ground, by means of vertical tubes. In order to study the dynamics of the heat exchange process, one needs to know the temperature field in the ground that results from the thermal interaction with the heat transfer tube as well as the heat transferred to or extracted from the heat storage. This issue is solved by means of an implicit finite difference scheme assuming that the tube is isothermal longitudinally. The temperature is plotted versus the radius for selected moments during the charge/discharge processes of a daily heat storage system and the transferred heat is calculated. The model is used for a single tube arrangement in order to get the primary results necessary to refine the model by taking into consideration the non-isothermal tube and further a structure consisting of connected tube arrays. Key words: sensible heat thermal energy storage, borehole thermal energy storage, isothermal tube, numerical modelling, finite difference method. ∗ Corresponding author: e-mail: bogdan_horbaniuc@yahoo.com
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BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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