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Relevant bibliographies by topics / Experimental and numerical results

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Academic literature on the topic 'Experimental and numerical results'

Author: Grafiati

Published: 10 March 2023

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Journal articles on the topic "Experimental and numerical results"

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COHEN, JAIME, and MARTIN FARACH. "Numerical Taxonomy on Data: Experimental Results." Journal of Computational Biology 4, no. 4 (1997): 547–58. http://dx.doi.org/10.1089/cmb.1997.4.547.

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Teng, S. P., and C. H. Lee. "Numerical analysis of through-diffusion experimental results." Cement and Concrete Research 22, no. 2-3 (1992): 445–50. http://dx.doi.org/10.1016/0008-8846(92)90087-c.

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Carotenuto, A., C. Casarosa, and L. Martorano. "The geothermal convector: experimental and numerical results." Applied Thermal Engineering 19, no. 4 (1999): 349–74. http://dx.doi.org/10.1016/s1359-4311(98)00065-9.

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Emaci, E., M. A. F. Azeez, and A. F. Vakakis. "DYNAMICS OF TRUSSES: NUMERICAL AND EXPERIMENTAL RESULTS." Journal of Sound and Vibration 214, no. 5 (1998): 953–64. http://dx.doi.org/10.1006/jsvi.1997.1474.

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Beldica, C., and J. Botsis. "Experimental and numerical studies in model composites Part II: Numerical results." International Journal of Fracture 82, no. 2 (1996): 175–92. http://dx.doi.org/10.1007/bf00034662.

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Zhao, D., and J. Botsis. "Experimental and numerical studies in model composites Part I: Experimental results." International Journal of Fracture 82, no. 2 (1996): 153–74. http://dx.doi.org/10.1007/bf00034661.

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Iványi, Peter, and Miklós Iványi. "Numerical study of experimental results of steel connections." Pollack Periodica 5, no. 2 (2010): 3–18. http://dx.doi.org/10.1556/pollack.5.2010.2.1.

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Manach, P. Y., Marta C. Oliveira, S. Thuillier, and Luís Filipe Menezes. "Reverse Deep Drawing: Experimental and Numerical Simulation Results." Key Engineering Materials 230-232 (October 2002): 541–44. http://dx.doi.org/10.4028/www.scientific.net/kem.230-232.541.

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Watson, Ian, Tracie Barber, and Eddie Leonardi. "Whole field validation of numerical and experimental results." Computers & Fluids 40, no. 1 (2011): 12–27. http://dx.doi.org/10.1016/j.compfluid.2010.07.010.

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Willner, Kai, and Daniel Görke. "Contact of fractal surfaces – Experimental and numerical results." PAMM 6, no. 1 (2006): 279–80. http://dx.doi.org/10.1002/pamm.200610120.

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Dissertations / Theses on the topic "Experimental and numerical results"

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Yalamanchili, Seshu R. "Response of multiple fastener composite joints : numerical and experimental results /." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-11242009-020154/.

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Hein, Torsten, and Marcus Meyer. "Identification of material parameters in linear elasticity - some numerical results." Universitätsbibliothek Chemnitz, 2007. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200702040.

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In this paper we present some numerical results concerning the identification of material parameters in linear elasticity by dealing with small deformations. On the basis of a precise example different aspects of the parameter estimation problem are considered. We deal with practical questions such as the experimental design for obtaining sufficient data for recovering the unknown parameters as well as questions of treating the corresponding inverse problems numerically. Two algorithms for solving these problems can be introduced and extensive numerical case studies are presented and discussed.

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Perazzini, Matteo. "Evaluation of FBG strain sensor reliability through analytical, numerical and experimental results." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22947/.

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The fiber Bragg grating (FBG) sensor is one of the most suitable sensors for structural health monitoring (SHM) of aircraft structures. In principle, the FBG, with adequate sampling and signal processing techniques, is usually more accurate than classical electrical resistive strain gauge. However, since the most common installation method is surface bonding, some significative differences between the strain in the host structure and the one experienced by the fiber may be observed. The aim of this work is the evaluation of the fiber Bragg grating optical fiber sensor reliability for strain detection in non-uniform strain conditions. A FBG sensor is surface bonded on a rectangular specimen with a centered hole under tensile loading. A multi device method for the strain detection is created with the use of optical fiber, strain gauge and DIC technologies at the same time. In addition, based on microscopic observations, a 3D finite element model of the bonded optical fiber is created to simulate the behavior of the test specimen and to have an insight into the strain transfer between the host material and the optical fiber core. Lastly, being the test specimen a well-known case in literature, the strain is also computed with closed-form expressions. All the experimental, numerical, and analytical results are then compared. Taking into account the possible sources of error, the comparison shows coherence between the different results. The optical fiber strain sensor reliability is verified through the multiple device method which represents the starting point for future research activities.

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Marcel, Sébastien. "Numerical thermal investigation of a space probe heat shield - Comparison with experimental results." Thesis, KTH, Rymd- och plasmafysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91471.

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The objective of this internship was to study the physical properties of a thermal protection used for a space probe to be launched for a mission to Mars. The protection is composed of two main components. The topmost part is a cork derivative that deteriorates via ablation and pyrolysis in order to reduce the amount of heat transferred to the vehicle's main body. The junction between the ablative layer and the spaceship is ensured by a sandwich material composed of two carbon skins separated by a grid of Aluminium honeycomb cells. In a first part, numerical models of variable complexity were created to simulate the properties of the sandwich material (thermal conductivity, specific thermal capacity). The models' results were then compared to experimental measurements to upgrade Astrium's databases concerning similar products with new values for the physical properties of the studied materials. The results obtained by both the model and the experiments were found to be in accordance, which justies the validity of the simulation, and the choices made for the values of physical properties. In addition, a thorough consideration of the in　uence of phenomena neglected was performed to justify the stability of the numerical computations. In a second time, a staggered coupled simulation was developed to study the physical behaviour of the ablative protection. A thermal simulation considered the ablation, pyrolysis and thermal conduction. A mechanical simulation considered the swelling induced by the heating of the cork material. The results (temperature, swelling, density) from infra-red experiments and plasma jet testing were compared to the prediction of the coupled simulation. Although a substantial discrepancy remained between experimental and numerical results, the mere fact that a working program emulating at the same time ablation and swelling gave results physically coherent was already a positive advance in this domain.

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Novick, Jaison Allen. "Chaotic scattering in an open vase-shaped cavity: Topological, numerical, and experimental results." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539623550.

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We present a study of trajectories in a two-dimensional, open, vase-shaped cavity in the absence of forces The classical trajectories freely propagate between elastic collisions. Bound trajectories, regular scattering trajectories, and chaotic scattering trajectories are present in the vase. Most importantly, we find that classical trajectories passing through the vase's mouth escape without return. In our simulations, we propagate bursts of trajectories from point sources located along the vase walls. We record the time for escaping trajectories to pass through the vase's neck. Constructing a plot of escape time versus the initial launch angle for the chaotic trajectories reveals a vastly complicated recursive structure or a fractal. This fractal structure can be understood by a suitable coordinate transform. Reducing the dynamics to two dimensions reveals that the chaotic dynamics are organized by a homoclinic tangle, which is formed by the union of infinitely long, intersecting stable and unstable manifolds.;This study is broken down into three major components. We first present a topological theory that extracts the essential topological information from a finite subset of the tangle and encodes this information in a set of symbolic dynamical equations. These equations can be used to predict a topologically forced minimal subset of the recursive structure seen in numerically computed escape time plots. We present three applications of the theory and compare these predictions to our simulations. The second component is a presentation of an experiment in which the vase was constructed from Teflon walls using an ultrasound transducer as a point source. We compare the escaping signal to a classical simulation and find agreement between the two. Finally, we present an approximate solution to the time independent Schrodinger Equation for escaping waves. We choose a set of points at which to evaluate the wave function and interpolate trajectories connecting the source point to each "detector point". We then construct the wave function directly from these classical trajectories using the two-dimensional WKB approximation. The wave function is Fourier Transformed using a Fast Fourier Transform algorithm resulting in a spectrum in which each peak corresponds to an interpolated trajectory. Our predictions are based on an imagined experiment that uses microwave propagation within an electromagnetic waveguide. Such an experiment exploits the fact that under suitable conditions both Maxwell's Equations and the Schrodinger Equation can be reduced to the Helmholtz Equation. Therefore, our predictions, while compared to the electromagnetic experiment, contain information about the quantum system. Identifying peaks in the transmission spectrum with chaotic trajectories will allow for an additional experimental verification of the intermediate recursive structure. Finally, we summarize our results and discuss possible extensions of this project.

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Huang, Jun. "A study on fatigue of welded structures : predictive modeling based on automatic learning, numerical analysis, and experimental results /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3071054.

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Wegman, Kevin R. "Numerical Modeling of a Printed Circuit Heat Exchanger Based on Experimental Results from the High-Temperature Helium Test Facility." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461266010.

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Sierra-Espinosa, Fernando Zenaido. "The turbulence structure of the flow in a 90#deg C# pipe junction : a comparison of numerical predictions to experimental laser doppler and particle image velocimetry results." Thesis, Cardiff University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286901.

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Benezech, Jean. "Modélisation aux échelles méso- et macroscopique du comportement mécanique de zones singulières de pièces de structure en CMC." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0309.

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Les composites à matrice céramique (CMC) présentent une architecture multi-échelle complexe. Pour être utilisé en tant que composant de moteur aéronautique qui nécessitent des géométries complexes, ces matériaux doivent être tissés sous forme d'architectures textiles spécifiques. Mon travail s’est concentré sur l’étude d’une pièce de type raidisseur, et plus particulièrement sur le détail d’une jonction composite tissée. La taille caractéristique de cette pièce se situe entre les échelles méso- et macroscopique, ce qui rend impossible l’utilisation des hypothèses de séparabilité des échelles. Nous avons tout d’abord développé un montage expérimentale de flexion/cisaillement adapté à la jonction tissée. Ces essais ont non seulement permis d’identifier et de caractériser le comportement mécanique de cette pièce, mais aussi, de mettre en lumière l’interdépendance entre le chargement, l’architecture textile et les mécanismes d’endommagement, qui est particulièrement importante dans le cas de la jonction tissée. C’est pourquoi, la modélisation de ce détail de structure doit inclure une connaissance approfondie de l’architecture interne du matériau. Nous avons donc développé une approche originale de segmentation variationnelle à partir de µCT, afin de construire des modèles numériques réalistes du matériau à l’échelle mésoscopique. Cette approche repose sur une heuristique globale-locale qui améliore itérativement la ressemblance d’un modèle géométrique initial. Cette démarche a permis de construire le jumeau numérique de la jonction tissée. Le modèle final ne comportant pas d’interpénétration entre fils, un maillage tétraédrique conforme peut ensuite être généré directement à partir de l’image ainsi labellisée. Des simulations EF à l’échelle mésoscopique ont été menées en prenant en compte le comportement non-linéaire des constituants des CMC. Elles permettent de prévoir le niveau de chargement menant aux premiers endommagements. De plus, la localisation des endommagements ainsi que leurs interactions avec l’architecture méso ont également ont été reproduites de manière satisfaisante.Cependant, ces modèles incluent une description très détaillée du matériau et nécessitent donc des ressources de calcul importantes. Une description approchée de ces détails pourrait être suffisante pour obtenir une prédiction correcte des propriétés élastiques, voir de l’amorçage de l’endommagement. Nous avons donc proposé un pont méso-macro permettant de construire le comportement apparent des éléments macroscopiques à partir de l’information méso sous-jacente. Les propriétés des éléments macroscopiques sont obtenues en assimilant localement le matériau à un stratifié équivalent construit à partir des fractions volumiques et des orientations locales des constituants. Cette approche permet de réduire drastiquement la taille des problèmes EF, tout en conservant une description approchée de la méso-structure. Le modèle macroscopique enrichi permet de reproduire fidèlement les résultats obtenus à l’échelle mésoscopique, tant que la taille de filtrage reste comparable à celle des fils.Les modèles proposés ont été utilisés pour reproduire les résultats expérimentaux et approfondir leur analyse. Nous avons étudié en particulier la sensibilité aux conditions aux limites de l’essai, ainsi que l’influence des variabilités liées au procédé de fabrication des éprouvettes. Enfin, la chaine d’outils développée dans le cadre de la thèse pourra être utilisée pour étudier différentes définitions textiles de la jonction, permettant in fine de définir l’architecture optimale de la pièce<br>Woven ceramic matrix composites (CMC) exhibit an intricate multi-scale architecture. To be used as components of aircraft engines, the weaving of such parts could also incorporate specific features compared to « classical » woven CMC as they need to comply with complex geometries. My work focused on a stiffener-like fully woven junction that is made of a complex 3D woven fabric, and whose characteristic size lies at the frontier between the mesoscopic and the macroscopic scales, i.e. where scale separation hypothesis is not applicable.I have first developed an experimental device to perform shear/bending tests on the woven junction. These tests not only allowed to gain significant knowledge about the mechanical behavior of such part, but also to highlight the interplay between the load, material architecture and damage mechanisms that is particularly significant in the case of the woven junction. Therefore, numerical prediction of the mechanical behavior of the woven junction necessitates a sound knowledge of its inner structure.With this aim, I have developed an original segmentation method to build realistic numerical models of textile composites, using X-ray micro-computed tomography and a prior geometric model. The procedure includes a global-local heuristic to iteratively improve the resemblance of the initial model. This approach allowed to build “digital twins” of the woven junction. A conformal tetrahedral image-based mesh could then be obtained as the resulting models are free of interpenetration. Mesoscale FE simulations, including non-linear behavior laws of the yarns and matrix, allowed to predict the maximal load leading to the first damage events, and to reproduce accurately the damage localization and its interaction with the architecture.However, with such level of details incorporated in the model, the simulations necessitate significant computational resources. An approximate macro-scale description may be sufficient to evaluate the elastic properties, or even to simulate damage initiation. Therefore, we have proposed a meso-informed macroscopic modelling framework where the behaviour of the macro-elements is derived from the knowledge of the local direction and volume fraction of constituents, thanks to the digital twin. The effective behaviour of the macro-elements is obtained through an equivalent lamina. This method drastically reduces the size of the model while preserving an approximate description of the underlying local anisotropy and heterogeneities. With respect to the damage initiation, the meso-informed macroscopic model accurately reproduced the results obtained using the reference mesoscale model, as long as the filtering size remains comparable to the yarn size. This allowed to propose an optimal modelling framework with an adequate level of description of meso-details and acceptable computational requirements.Finally, I have used these models to thoroughly compare the numerical simulations with the experimental results: variabilities of experimental boundary conditions have been analyzed, as well as the influence of specific heterogeneities related to the fabrication process. We have also used this framework to explore different weaving patterns in order to obtain an optimal design of the woven junction

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Carvalho, Marco Aurélio. "IPCM Telemetry System: Experimental Results." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596440.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>The aeronautical industries have been suffering financial cutbacks and the market has to face new challenges associated with new companies. Telemetry community has been facing the increase of the electromagnetic spectrum usage for a variety of applications (e.g. 4G), after all telemetry is everywhere. In view of these issues and focused on the inherent requirements of the Flight Test application, the IPEV R&D group proposes the iPCM Telemetry architecture as solution for the existing reliability and bandwidth issues associated with the telemetry link. In this article, as a proof-of-concept of the iPCM architecture, it has been performed an experimental assembly. The results demonstrate the iPCM's ability to regenerate corrupted data providing the required data integrity and reliability, besides the capability to dynamically select the FTI transmitted parameter list to optimize the bandwidth link.

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Books on the topic "Experimental and numerical results"

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Körner, Horst, and Reinhard Hilbig, eds. New Results in Numerical and Experimental Fluid Mechanics. Vieweg+Teubner Verlag, 1997. http://dx.doi.org/10.1007/978-3-322-86573-1.

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Dillmann, Andreas, Gerd Heller, Ewald Krämer, and Claus Wagner, eds. New Results in Numerical and Experimental Fluid Mechanics XIII. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79561-0.

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Dillmann, Andreas, Gerd Heller, Ewald Krämer, Claus Wagner, Cameron Tropea, and Suad Jakirlić, eds. New Results in Numerical and Experimental Fluid Mechanics XII. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-25253-3.

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Wagner, Siegfried, Ulrich Rist, Hans-Joachim Heinemann, and Reinhard Hilbig, eds. New Results in Numerical and Experimental Fluid Mechanics III. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-540-45466-3.

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Dillmann, Andreas, Gerd Heller, Ewald Krämer, Hans-Peter Kreplin, Wolfgang Nitsche, and Ulrich Rist, eds. New Results in Numerical and Experimental Fluid Mechanics IX. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03158-3.

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Breitsamter, Christian, Boris Laschka, Hans-Joachim Heinemann, and Reinhard Hilbig, eds. New Results in Numerical and Experimental Fluid Mechanics IV. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39604-8.

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Rath, Hans-Josef, Carsten Holze, Hans-Joachim Heinemann, Rolf Henke, and Heinz Hönlinger, eds. New Results in Numerical and Experimental Fluid Mechanics V. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9.

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Dillmann, Andreas, Gerd Heller, Ewald Krämer, et al., eds. New Results in Numerical and Experimental Fluid Mechanics XI. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-64519-3.

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Tropea, Cameron, Suad Jakirlic, Hans-Joachim Heinemann, Rolf Henke, and Heinz Hönlinger, eds. New Results in Numerical and Experimental Fluid Mechanics VI. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-74460-3.

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Dillmann, Andreas, Gerd Heller, Ewald Krämer, Claus Wagner, and Christian Breitsamter, eds. New Results in Numerical and Experimental Fluid Mechanics X. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27279-5.

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Book chapters on the topic "Experimental and numerical results"

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Christodoulides, Costas, and George Christodoulides. "The Presentation of Numerical Results." In Analysis and Presentation of Experimental Results. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53345-2_5.

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Rahman, A. H. M. E., and M. N. Cavalli. "Experimental and Numerical Results for Diffusion Bonded Joints." In Experimental and Applied Mechanics, Volume 6. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0222-0_65.

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Gaurier, Benoît, Grégory Germain, Marc Le Boulluec, Eric Giry, and Emmanuel Fontaine. "Experimental and numerical results on VIV and WIO." In IUTAM Symposium on Fluid-Structure Interaction in Ocean Engineering. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8630-4_6.

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Brachet, M. E., C. Nore, M. Abid, J. Maurer, and P. Tabeli. "Low–Temperature Superfluid Turbulence: Experimental and Numerical Results." In Fluid Mechanics and Its Applications. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_93.

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Duraiappah, Anantha K. "Numerical Results of Policy Experiments." In Advances in Computational Economics. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1757-9_6.

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Gün, Levent. "Experimental Results on Matrix-Analytical Solution Techniques: Extensions and Comparisons*." In Numerical Solution of Markov Chains. CRC Press, 2021. http://dx.doi.org/10.1201/9781003210160-38.

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Schütte, Andreas, Gunnar Einarsson, Britta Schöning, et al. "Numerical simulation of maneuvering combat aircraft." In New Results in Numerical and Experimental Fluid Mechanics V. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_13.

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Kuntz, Martin, and Florian R. Menter. "Numerical Flow Simulation with Moving Grids." In New Results in Numerical and Experimental Fluid Mechanics V. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-33287-9_54.

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Dreyssé, Hugues. "Surface and Interface Magnetism: recent theoretical and numerical results." In Metallic Alloys: Experimental and Theoretical Perspectives. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1092-1_39.

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Rist, U., K. Augustin, and S. Wagner. "Numerical Simulation of Laminar Separation-Bubble Control." In New Results in Numerical and Experimental Fluid Mechanics III. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-540-45466-3_22.

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Conference papers on the topic "Experimental and numerical results"

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Auricchio, Ferdinando, Simone Morganti, and Alessandro Reali. "SMA numerical modeling versus experimental results." In ESOMAT 2009 - 8th European Symposium on Martensitic Transformations. EDP Sciences, 2009. http://dx.doi.org/10.1051/esomat/200908004.

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Favot, V., M. Schwienbacher, T. Buschmann, et al. "The Humanoid Robot LOLA—Experimental Results." In ICNAAM 2010: International Conference of Numerical Analysis and Applied Mathematics 2010. AIP, 2010. http://dx.doi.org/10.1063/1.3498487.

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do Nascimento, M., M. Municci, A. Ramos, J. Chanes, Jr., and H. Nagamatsu. "Hypersonic gaseous piston shock tunnel - Numerical and experimental results." In 36th AIAA Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-548.

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Zhou, Simon, and Marvin Kilgo. "Ablation of complex microfluidic structures: Experimental and numerical results." In ICALEO® ‘99: Proceedings of the Laser Microfabrication Conference. Laser Institute of America, 1999. http://dx.doi.org/10.2351/1.5059314.

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Azoui, T., P. Tounsi, Ph Dupuy, J. M. Dorkel, and D. Martineau. "Numerical and experimental results correlation during power MOSFET ageing." In 2012 13th Intl. Conf. on Thermal, Mechanical & Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2012. http://dx.doi.org/10.1109/esime.2012.6191798.

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Williams, A. J. M. "Quantitative validation of numerical technique results against experimental data." In Tenth International Conference on Antennas and Propagation (ICAP). IEE, 1997. http://dx.doi.org/10.1049/cp:19970312.

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Lacapere, J., B. Vieille, and B. Legrand. "Experimental and numerical results of sloshing with cryogenic fluids." In Progress in Propulsion Physics. EDP Sciences, 2009. http://dx.doi.org/10.1051/eucass/200901267.

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Durante, M.-G., L. di Sarno, S. Sica, G. Mylonakis, C. Taylor, and A. Simonelli. "SEISMIC PILE-SOIL INTERACTION: EXPERIMENTAL RESULTS VS. NUMERICAL SIMULATIONS." In 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2014. http://dx.doi.org/10.7712/120113.4588.c1621.

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Durante, Maria Giovanna, Luigi Di Sarno, Colin A. Taylor, George Mylonakis, and Armando Lucio Simonelli. "SOIL-PILE-STRUCTURE-INTERACTION: EXPERIMENTAL RESULTS AND NUMERICAL SIMULATIONS." In 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2015. http://dx.doi.org/10.7712/120115.3699.2830.

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Di Matteo, Alberto, Francesco Lo Iacono, Giacomo Navarra, and Antonina Pirrotta. "The TLCD Passive Control: Numerical Investigations vs. Experimental Results." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86568.

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Very recently the tuned liquid column damper (TLCD) is receiving an increasing interest from researchers concerned with vibration control, to be considered an alternative device with respect to the tuned mass damper (TMD), since the former has low cost, easy adjustment, flexible installation. However, in recent studies the authors [1] have pointed out that for TMD the analytical formulation provides results that are in good agreement with the experimental ones, while for TLCD it has been deducted that the analytical formulation needs further investigation. In fact using the classical formulation of the problem, numerical results are very different from the experimental results obtained by the authors using the facilities at the experimental dynamic laboratory of University of Palermo. In particular it has been shown that the total liquid length should be corrected in an effective one, but in a different way from what has been done in literature, where only the variation of section of the vessel has been taken into account. On the other hand, from experimental investigations it is seen that the liquid moves more in the central area of the tube and less in the area in contact with the side walls. This aspect plays a fundamental role for capturing the real performance of TLCD. In fact, being the TLCD a special type of auxiliary damping device which relies on the inertia of liquid column in a U-tube to counteract the forces acting on the structure, then it is necessary to identify the effective moving liquid mass. To aim at this, in this paper the authors differentiate the total liquid mass into a liquid dead mass and a liquid dynamic mass, then introducing these values into a properly modified mathematical formulation numerical results match the experimental ones for all tests.

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Reports on the topic "Experimental and numerical results"

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Suo-Anttila, Jill Marie, Walter Gill, and Amalia Rebecca Black. Numerical predictions and experimental results of a dry bay fire environment. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/918259.

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BLACK, AMALIA R., JILL M. SUO-ANTTILA, LOUIS A. GRITZO, PETER J. DISIMILE, and JAMES R. TUCKER. Numerical Predictions and Experimental Results of Air Flow in a Smooth Quarter-Scale Nacelle. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/800965.

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Cherry, Matthew, Jeremy Knopp, Mark Blodgett, and Ramana Grandhi. Experimental Eddy Current Measurements of Flawed Edges Compared with Results from Probabilistic Numerical Models (Preprint). Defense Technical Information Center, 2011. http://dx.doi.org/10.21236/ada553670.

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Forney, Glenn P., William D. Davis, and John J. Klote. Simulating the effect of beamed ceilings on smoke flow, part I. comparison of numerical and experimental results. National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4994.

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Wang, Yao, Mirela D. Tumbeva, and Ashley P. Thrall. Evaluating Reserve Strength of Girder Bridges Due to Bridge Rail Load Shedding. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317308.

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This research experimentally and numerically evaluated the reserve strength of girder bridges due to bridge rail load shedding. The investigation included: (1) performing non-destructive field testing on two steel girder bridges and one prestressed concrete girder bridge, (2) developing validated finite element numerical models, and (3) performing parametric numerical investigations using the validated numerical modeling approach. Measured data indicated that intact, integral, reinforced concrete rails participate in carrying live load. Research results culminated in recommendations to evaluate the reserve strength of girder bridges due to the participation of the rail, as well as recommendations for bridge inspectors for evaluating steel girder bridges subjected to vehicular collision.

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Ramakrishnan, Aravind, Ashraf Alrajhi, Egemen Okte, Hasan Ozer, and Imad Al-Qadi. Truck-Platooning Impacts on Flexible Pavements: Experimental and Mechanistic Approaches. Illinois Center for Transportation, 2021. http://dx.doi.org/10.36501/0197-9191/21-038.

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Truck platoons are expected to improve safety and reduce fuel consumption. However, their use is projected to accelerate pavement damage due to channelized-load application (lack of wander) and potentially reduced duration between truck-loading applications (reduced rest period). The effect of wander on pavement damage is well documented, while relatively few studies are available on the effect of rest period on pavement permanent deformation. Therefore, the main objective of this study was to quantify the impact of rest period theoretically, using a numerical method, and experimentally, using laboratory testing. A 3-D finite-element (FE) pavement model was developed and run to quantify the effect of rest period. Strain recovery and accumulation were predicted by fitting Gaussian mixture models to the strain values computed from the FE model. The effect of rest period was found to be insignificant for truck spacing greater than 10 ft. An experimental program was conducted, and several asphalt concrete (AC) mixes were considered at various stress levels, temperatures, and rest periods. Test results showed that AC deformation increased with rest period, irrespective of AC-mix type, stress level, and/or temperature. This observation was attributed to a well-documented hardening–relaxation mechanism, which occurs during AC plastic deformation. Hence, experimental and FE-model results are conflicting due to modeling AC as a viscoelastic and the difference in the loading mechanism. A shift model was developed by extending the time–temperature superposition concept to incorporate rest period, using the experimental data. The shift factors were used to compute the equivalent number of cycles for various platoon scenarios (truck spacings or rest period). The shift model was implemented in AASHTOware pavement mechanic–empirical design (PMED) guidelines for the calculation of rutting using equivalent number of cycles.

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Patel, Reena, David Thompson, Guillermo Riveros, Wayne Hodo, John Peters, and Felipe Acosta. Dimensional analysis of structural response in complex biological structures. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41082.

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The solution to many engineering problems is obtained through the combination of analytical, computational and experimental methods. In many cases, cost or size constraints limit testing of full-scale articles. Similitude allows observations made in the laboratory to be used to extrapolate the behavior to full-scale system by establishing relationships between the results obtained in a scaled experiment and those anticipated for the full-scale prototype. This paper describes the application of the Buckingham Pi theorem to develop a set of non-dimensional parameters that are appropriate for describing the problem of a distributed load applied to the rostrum of the paddlefish. This problem is of interest because previous research has demonstrated that the rostrum is a very efficient structural system. The ultimate goal is to estimate the response of a complex, bio-inspired structure based on the rostrum to blast load. The derived similitude laws are verified through a series of numerical experiments having a maximum error of 3.39%.

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Sparks, Paul, Jesse Sherburn, William Heard, and Brett Williams. Penetration modeling of ultra‐high performance concrete using multiscale meshfree methods. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41963.

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Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistance over conventional strength concrete. Developing predictive numerical models of UHPC subjected to penetration is critical in understanding the material's enhanced performance. This study employs the advanced fundamental concrete (AFC) model, and it runs inside the reproducing kernel particle method (RKPM)‐based code known as the nonlinear meshfree analysis program (NMAP). NMAP is advantageous for modeling impact and penetration problems that exhibit extreme deformation and material fragmentation. A comprehensive experimental study was conducted to characterize the UHPC. The investigation consisted of fracture toughness testing, the utilization of nondestructive microcomputed tomography analysis, and projectile penetration shots on the UHPC targets. To improve the accuracy of the model, a new scaled damage evolution law (SDEL) is employed within the microcrack informed damage model. During the homogenized macroscopic calculation, the corresponding microscopic cell needs to be dimensionally equivalent to the mesh dimension when the partial differential equation becomes ill posed and strain softening ensues. Results of numerical investigations will be compared with results of penetration experiments.

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Tuller, Markus, Asher Bar-Tal, Hadar Heller, and Michal Amichai. Optimization of advanced greenhouse substrates based on physicochemical characterization, numerical simulations, and tomato growth experiments. United States Department of Agriculture, 2014. http://dx.doi.org/10.32747/2014.7600009.bard.

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Over the last decade there has been a dramatic shift in global agricultural practice. The increase in human population, especially in underdeveloped arid and semiarid regions of the world, poses unprecedented challenges to production of an adequate and economically feasible food supply to undernourished populations. Furthermore, the increased living standard in many industrial countries has created a strong demand for high-quality, out-of-season vegetables and fruits as well as for ornamentals such as cut and potted flowers and bedding plants. As a response to these imminent challenges and demands and because of a ban on methyl bromide fumigation of horticultural field soils, soilless greenhouse production systems are regaining increased worldwide attention. Though there is considerable recent empirical and theoretical research devoted to specific issues related to control and management of soilless culture production systems, a comprehensive approach that quantitatively considers all relevant physicochemical processes within the growth substrates is lacking. Moreover, it is common practice to treat soilless growth systems as static, ignoring dynamic changes of important physicochemical and hydraulic properties due to root and microbial growth that require adaptation of management practices throughout the growth period. To overcome these shortcomings, the objectives of this project were to apply thorough physicochemical characterization of commonly used greenhouse substrates in conjunction with state-of-the-art numerical modeling (HYDRUS-3D, PARSWMS) to not only optimize management practices (i.e., irrigation frequency and rates, fertigation, container size and geometry, etc.), but to also “engineer” optimal substrates by mixing organic (e.g., coconut coir) and inorganic (e.g., perlite, pumice, etc.) base substrates and modifying relevant parameters such as the particle (aggregate) size distribution. To evaluate the proposed approach under commercial production conditions, characterization and modeling efforts were accompanied by greenhouse experiments with tomatoes. The project not only yielded novel insights regarding favorable physicochemical properties of advanced greenhouse substrates, but also provided critically needed tools for control and management of containerized soilless production systems to provide a stress-free rhizosphere environment for optimal yields, while conserving valuable production resources. Numerical modeling results provided a more scientifically sound basis for the design of commercial greenhouse production trials and selection of adequate plant-specific substrates, thereby alleviating the risk of costly mistrials.

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Wilson, D., Vladimir Ostashev, Michael Shaw, et al. Infrasound propagation in the Arctic. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42683.

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This report summarizes results of the basic research project “Infrasound Propagation in the Arctic.” The scientific objective of this project was to provide a baseline understanding of the characteristic horizontal propagation distances, frequency dependencies, and conditions leading to enhanced propagation of infrasound in the Arctic region. The approach emphasized theory and numerical modeling as an initial step toward improving understanding of the basic phenomenology, and thus lay the foundation for productive experiments in the future. The modeling approach combined mesoscale numerical weather forecasts from the Polar Weather Research and Forecasting model with advanced acoustic propagation calculations. The project produced significant advances with regard to parabolic equation modeling of sound propagation in a windy atmosphere. For the polar low, interesting interactions with the stratosphere were found, which could possibly be used to provide early warning of strong stratospheric warming events (i.e., the polar vortex). The katabatic wind resulted in a very strong low-level duct, which, when combined with a highly reflective icy ground surface, leads to efficient long-distance propagation. This information is useful in devising strategies for positioning sensors to monitor environmental phenomena and human activities.

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