Bibliografias temáticas / Experimental and numerical approach

Literatura científica selecionada sobre o tema "Experimental and numerical approach"

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Publicado: 25 de maio de 2024

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Artigos de revistas sobre o assunto "Experimental and numerical approach"

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Rafiee, Ashkan, Fabrizio Pistani e Krish Thiagarajan. "Study of liquid sloshing: numerical and experimental approach". Computational Mechanics 47, n.º 1 (27 de agosto de 2010): 65–75. http://dx.doi.org/10.1007/s00466-010-0529-6.

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Cherneva, Sabina, Milko Yordanov, Dimitar Stoychev e Rumen Iankov. "Experimental-Numerical Approach for Characterization of Mechanical Properties of Thin Electrochemically Deposited Chromium and Copper Films". Solid State Phenomena 159 (janeiro de 2010): 157–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.159.157.

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A hybrid experimental-numerical approach, which combines microindentation experiments (where we measure the diagonal of the residual imprint after unloading) and numerical simulations by means of the finite-element method has been developed. The investigated materials in the present work are electrochemically deposited on brass substrates chromium and copper films with known thickness and unknown mechanical properties. Mechanical properties of the brass (CuZn36) substrate are known. Vickers’ microindentation experiments were carried out on the films and as a result the experimental load-displacement curves were obtained. After that the process of microindentation was modelled numerically by means of the finite-element method. Numerically obtained load-displacement curves were compared with the experimental curves. The results show good coincidence between numerical and experimental curves. Additionally it was realized nanoindentation experiment of thin copper film and these two methods (nanoindentation experiment and hybrid experimental-numerical method which combines experiment of microindentation and numerical simulations) for determination of mechanival properties of thin copper films were compared. Results obtained by means of the afore-mentioned two methods almost coincide but the second method is cheaper and gives more information about material properties of the film than the first method. It is shown that the second method is preferable to determine the mechanical properties of thin metal films.
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Erklig, Ahmet, e M. Akif Kütük. "Experimental Finite Element Approach for Stress Analysis". Journal of Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/643051.

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This study aims to determining the strain gauge location points in the problems of stress concentration, and it includes both experimental and numerical results. Strain gauges were proposed to be positioned to corresponding locations on beam and blocks to related node of elements of finite element models. Linear and nonlinear cases were studied. Cantilever beam problem was selected as the linear case to approve the approach and conforming contact problem was selected as the nonlinear case. An identical mesh structure was prepared for the finite element and the experimental models. The finite element analysis was carried out with ANSYS. It was shown that the results of the experimental and the numerical studies were in good agreement.
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Smolnicki, Michal Jan, Michal Ptak e Grzegorz Lesiuk. "Static failure load predictions in notched steel components using a combined experimental-numerical approach". International Journal of Structural Integrity 8, n.º 6 (4 de dezembro de 2017): 683–93. http://dx.doi.org/10.1108/ijsi-05-2017-0032.

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Purpose The combined numerical-experimental approach has been presented. The purpose of this paper is to determine the critical rupture load of the notched components based on the cohesive zone modeling (CZM). Design/methodology/approach The 42CrMo4 steel (in normalized state) state has been tested and modeled using an eXtended finite element method (xFEM) philosophy with the CZM approach. In order to validate the numerically obtained critical load forces the experimental verification was performed. Findings The critical loads were determined for various notch configurations. The numerical and experimental values were compared. Based on this, a good agreement between experimental and numerical data is achieved. The relative error does not exceed 7 percent. Practical implications The presented procedure and approach is effective and simple for engineering applications. It is worth to underline that the obtained critical load values for notched components require only the static tensile test results and implementation of the presented route in numerical FEM, xFEM environment. Originality/value The presented methodology is actual and still developed. The scientific and engineering value of the presented numerical procedure is high.
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Wu, Xiaoming, Changgen Shi, Ke Feng, Li Gao, Wenxuan Li e Kun Qian. "Experimental and numerical approach to titanium-aluminum explosive welding". Materials Research Express 8, n.º 9 (1 de setembro de 2021): 096503. http://dx.doi.org/10.1088/2053-1591/ac2017.

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Mahmutovic, Dino, Soanarivo Rinah Andriantrehina, Luc Boutonnier, Jacques Monnet, Saïd Taibi e Thierry Dubreucq. "Earthwork laboratory tests and suction – experimental and numerical approach". E3S Web of Conferences 9 (2016): 20006. http://dx.doi.org/10.1051/e3sconf/20160920006.

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Chryssolouris, G., K. Tsirbas e K. Salonitis. "An Analytical, Numerical, and Experimental Approach to Grind Hardening". Journal of Manufacturing Processes 7, n.º 1 (janeiro de 2005): 1–9. http://dx.doi.org/10.1016/s1526-6125(05)70076-1.

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Wallevik, Jon Elvar. "Thixotropic investigation on cement paste: Experimental and numerical approach". Journal of Non-Newtonian Fluid Mechanics 132, n.º 1-3 (dezembro de 2005): 86–99. http://dx.doi.org/10.1016/j.jnnfm.2005.10.007.

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Moldovan, Ionuţ Dragoş, António Gomes Correia e Cláudio Pereira. "Bender-based G0 measurements: A coupled numerical–experimental approach". Computers and Geotechnics 73 (março de 2016): 24–36. http://dx.doi.org/10.1016/j.compgeo.2015.11.011.

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Lüders, Caroline, Gerhard Kalinka, Wei Li, Michael Sinapius e Tobias Wille. "Experimental and numerical multiscale approach to thermally cycled FRP". Composite Structures 244 (julho de 2020): 112303. http://dx.doi.org/10.1016/j.compstruct.2020.112303.

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Teses / dissertações sobre o assunto "Experimental and numerical approach"

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Donkelaar, Corrinus Cornelis van. "A numerical and experimental approach to spatial phenomena". [Maastricht : Maastricht : Universiteit Maastricht] ; University Library, Maastricht University [Host], 1999. http://arno.unimaas.nl/show.cgi?fid=6828.

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Soufri, Ayoub. "Multi-impact behavior of composite structures : experimental and numerical approach". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCK038.

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Les matériaux composites sont largement utilisés dans le domaine des transports en raison de leurs propriétés mécaniques spécifiques élevées. Cependant, au cours de leur cycle de vie, ils peuvent subir une dégradation significative de leurs propriétés mécaniques lorsqu'ils sont soumis à des chargements d'impacts. Les dommages induits par des impacts se manifestent sous différentes formes telles que la rupture des fibres, la fissuration matricielle, la décohésion fibres/matrice et le délaminage. L'étude du comportement aux impacts des structures composites a suscité une attention importante dans la littérature. Cependant, ces études se rapportent généralement au cas d'un seul impact ou d'impacts répétés. Peu de travaux se sont intéressés au cas d'impacts multiples, même s'ils sont plus proches des conditions réelles de service, comme dans les cas de chute de grêlons ou de projection d'objets externes tels que les gravillons présents sur les routes, les impacts d'oiseaux, etc. Dans cette thèse, nous présentons des méthodes expérimentales et numériques robustes pour le suivi in-situ et post-mortem des endommagements suite aux différents cas d'impacts possibles : mono-impact, impacts répétés, séquentiels, simultanés, etc. Ce travail a consisté dans un premier temps à développer un banc d'essai unique « canon à air comprimé ». Ensuite, un dialogue (essais expérimentaux-calculs numériques) a été assuré afin de mieux comprendre les phénomènes en jeu dans les cas de multi-impacts, pour finalement atteindre les performances maximales des matériaux composites
Composite materials are widely used in the transportation field due to their high specific mechanical properties. However, during their life cycle, they can undergo significant degradation of their mechanical properties when subjected to impact loading. Impact-induced damage occurs in various forms, such as fiber breakage, matrix cracking, fiber/matrix decohesion and delamination. The study of the impact behavior of composite structures has attracted considerable attention in the literature. However, these studies generally relate to the case of a single impact or repeated impacts. Few studies have focused on the case of multiple impacts, even though these are closer to actual service conditions, as in the case of falling hailstones or the projection of external objects such as road gravels, bird strikes, etc. In this thesis, we present robust experimental and numerical methods for in-situ and post-mortem monitoring of damage following the various possible impact cases: single-impact, repeated, sequential, simultaneous impacts, etc. The first phase of the project involved the development of a unique "compressed air cannon" test bench. Then, a dialogue (experimental tests-numerical computations) was ensured to better understand the phenomena involved in multi-impact cases, to finally reach the maximum performance of composite materials
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Jolkin, Alexei. "EHL investigations using a hybrid technique : an experimental and numerical approach". Licentiate thesis, Luleå tekniska universitet, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25826.

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This licentiate thesis deals with a hybrid experimental and numerical method, the so-called Hybrid Technique, to study film thickness and pressure distribution and to investigate the behaviour and properties of lubricants in highly loaded EHL conjunctions. The Hybrid Technique combines experimental studies and advanced numerical calculations. In the experimental part of the hybrid approach Optical interferometry and a Ball & Disc system are applied to obtain the colour intensity images of the EHL contact. The images that captured by a colour video system are then subjected for image analysis to evaluate the film thickness maps from the colour interferograms. The pressure distribution is obtained numerically by solving the equation of elastic deformation. Using the Hybrid Technique the pressure and lubricant film thickness in the contact are obtained without having made any assumptions regarding rheological behaviour of the lubricant. This makes the described approach to a very useful tool in investigations of EHL conjunctions under extreme conditions or in the study of multi-phase lubricants. A detailed description of the Hybrid Technique is given. Method is tested out on oil lubricated and grease lubricated contacts. Results are presented and discussed.

Godkänd; 1999; 20070403 (ysko)

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Singh, Raj Laxmi. "Strong radiative shocks relevant for stellar environments : experimental study and numerical approach". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066092/document.

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Les chocs forts sont présents dans des phénomènes astrophysiques variés. De tels chocs sont fortement influencés par le rayonnement par son couplage avec l’hydrodynamique. Par suite, leur topologie et leur dynamique sont assez complexes. Générer de tels chocs hypersoniques en laboratoire, dans des conditions contrôlées, est ainsi un outil pertinent pour étudier l’influence du rayonnement et pour comparer aux résultats des simulations numériques. Ces chocs sont générés par des lasers intenses et par des moyens électromagnétiques. La première partie du texte est consacré à l’étude numérique et expérimentale de l’interaction de deux chocs induits par laser se propageant en sens contraires. Les expériences ont été menées sur l’installation laser kJ PALS, qui permet de former deux chocs avec des vitesses propres différentes ($\sim$ 30-55 et 10-25 km/s respectivement) dans des gaz rares à pression faible (moins de 1 bar). Des diagnostics ont été installés : interférométrie visible, spectroscopie visible à résolution spatiale et temporelle, spectroscopie XUV intégrée en temps. Nos expériences montrent une forte interaction entre les deux précurseurs radiatifs. Les paramètres physiques du plasma ont été déduits de ces diagnostics et comparés aux résultats de simulations monodimensionnelles. La seconde partie est consacrée à la conception d’une expérience où le choc est généré de façon électromagnétique. L’optimisation de ce générateur est présentée ainsi que l’environnement expérimental permettant d’étudier des chocs jusqu’à 30 km/s dans des gaz rares peu denses (1 mbar)
Strong shocks are present in various astrophysical phenomena. Such shocks are strongly influenced by the radiation through its coupling with hydrodynamics. Thus their topology and dynamics are quite complex. Generating such hypersonic shocks in the laboratory, with controlled conditions, is thus an adequate tool to study the influence of radiation and to compare them with numerical simulations. Such shocks can be generated by intense lasers and electromagnetic devices.The first part of this dissertation concerns the numerical and experimental study of the interaction of two counter propagating laser-driven shocks. The experiments, performed at the kJ PALS laser facility allowed to generate shocks with different speeds ($\sim$ 30-55 km/s and 10-25 km/s), in noble gases and low pressure (less than 1 bar). Several diagnostics were implemented: visible interferometry, time- and space-resolved visible spectroscopy, and time integrated XUV spectroscopy. Our experiment shows a strong interaction of one radiative precursor onto the second one. The physical parameters of the plasma were deduced from the diagnostics and compared with 1-D simulation results. The second part is devoted to the design of an experiment where the shock is generated electromagnetically. The optimization of this generator is presented and also the full experimental set up which allows studying shock $\sim$ 30 km/s in noble gas at $\sim$ 1 mbar
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Follett, S. "Blast analysis of composite V-shaped hulls : an experimental and numerical approach". Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7300.

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During armed conflicts many casualties can be attributed to incidents involving vehicles and landmines. As a result mine protective features are now a pre-requisite on all armoured vehicles. Recent and current conflicts in Iraq and Afghanistan have shown that there is a requirement for vehicles that not only provide suitable protection against explosive devices but are also lightweight so that they may travel off-road and avoid the major routes where these devices are usually planted. This project aims to address the following two topics in relation to mine protected vehicles. 1. Could composite materials be used to replace conventional steels for the blast deflector plates located on the belly of the vehicle, and 2. How effective and realistic is numerical analysis in predicting the material response of these blast deflectors. It also looks into the acquisition and support of new equipment into the armed services, where the equipment itself is but one small element of the system involved. The first topic has been addressed by conducting a number of experimental tests using third scale V-shaped hulls manufactured from steel and two types of composite, S2 glass and E glass. These experiments found that, on a weight-for-weight equivalency, the S2 glass was by far the superior material, with very little damage to the outside shape of the hull. The steel was significantly deformed after testing and the E glass, although also did not deform as such, did experience a severe amount of matrix cracking leading to significant loss of structural integrity in that the hull could be easily flexed by hand after the tests. One S2 glass hull was also subjected to a further two explosive tests and although the amount of delamination was severe at the base of the hull there was very little geometry lost to the outside of the shape. The numerical modelling work consisted of the modelling of the mine blast phenomenon in autodyn and comparisons with published experimental and numerical work, with the results in reasonably good agreement. The second part consisted of comparing flat S2 glass plates subjected to varying charge sizes both experimentally and numerically in order to validate the material model, with good agreement. The final stage involved using the validated material model and re-creating the tests done on the V-shaped hulls. The results here at first were not in agreement, but with development of the model and the limitations from the experimental data collection methods applied a model that, when viewed with the experimental results, gave a reasonable representation of the experimental work was created. The management section of the thesis considers previous equipment purchases and what went wrong during their implementation. The Through Life Capability Management model is assessed in relation to an all composite vehicle and identifies some key questions and areas of concern, such as how the management of the DLOD trade-off process should be conducted.
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Williams, Randolph T. "A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones". Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339354653.

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Chaparala, Satish Chandra. "Die stress analysis in plastic encapsulated electronic packages an experimental and numerical approach /". Diss., Online access via UMI:, 2006.

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Ahmad, Yousef. "Oxidation of Graphite and Metallurgical Coke : A Numerical Study with an Experimental Approach". Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193604.

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At the royal institute of technology (KTH) in the department of applied process metallurgy, a novel modelling approach has been developed which allows a dynamic coupling between the commercial thermodynamic software Thermo-Calc and the commercial computational fluid dynamic (CFD) software Ansys Fluent, only referred to as Fluent in the study. The dynamic coupling approach is used to provide numerical CFD-models with thermodynamic data for the thermo-physical properties and for the fluid-fluid chemical reactions occurring in metallurgical processes. The main assumption forthe dynamic coupling approach is the existence of local equilibrium in each computational cell. By assuming local equilibrium in each computational cell it is possible to use thermodynamic data from thermodynamic databases instead of kinetic data to numerically simulate chemical reactions. The dynamic coupling approach has been used by previous studies to numerically simulate chemical reactions in metallurgical processes with good results. In order to validate the dynamic coupling approach further, experimental data is required regarding surface reactions. In this study, a graphiteand metallurgical coke oxidation experimental setup was suggested in order to provide the needed experimental data. With the experimental data, the ability of the dynamic couplings approach to numerically predict the outcome of surface reactions can be tested.By reviewing the literature, the main experimental apparatus suggested for the oxidationexperiments was a thermo-gravimetric analyzer (TGA). The TGA can provide experimental data regarding the reaction rate, kinetic parameters and mass loss as a function of both temperature and time. An experimental setup and procedure were also suggested.In order to test the ability of Fluent to numerically predict the outcome of surface reactions, without any implementation of thermodynamic data from Thermo-Calc, a benchmarking has been conducted. Fluent is benchmarked against graphite oxidation experiments conducted by Kim and No from the Korean advanced institute of science and technology (KAIST). The experimental graphite oxidation rates were compared with the numerically calculated graphite oxidation rates obtained from Fluent. A good match between the experimental graphite oxidation rates and the numerically calculated graphite oxidation rates were obtained. A parameter study was also conducted in order to study the effect of mass diffusion, gas flow rate and the kinetic parameters on the numerically calculated graphite oxidation rate. The results of the parameter study were partially supported by previous graphite oxidation studies. Thus, Fluent proved to be a sufficient numerical tool for numerically predicting the outcome of surface reactions regarding graphite oxidation at zero burn-off degree.
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Schley, Dan R. "Symbolic-Number Mapping in Judgments and Decisions: A Correlational and Experimental Approach". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448802342.

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Wagner, Pinto Fábio. "An experimental and numerical approach to investigate the machining performance of engineered grinding tools /". Zürich : ETH/ IWF, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17666.

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Livros sobre o assunto "Experimental and numerical approach"

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Emami, S. D. Thulium-doped fiber amplifier, numerical and experimental approach. New York: Nova Science Publishers, 2011.

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Wang, Hong-Bo. Heat transfer analysis of components of construction exposed to fire: A theoretical, numerical and experimental approach. Salford: University of Salford, 1995.

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Berghaus, Donald. Numerical Methods for Experimental Mechanics. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1473-2.

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Numerical methods for experimental mechanics. Boston: Kluwer Academic Publishers, 2001.

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Bequet, Marc C., ed. Teleoperation: Numerical Simulation and Experimental Validation. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2648-9.

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Bequet, Marc C. Teleoperation: Numerical Simulation and Experimental Validation. Dordrecht: Springer Netherlands, 1992.

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Leidelmeijer, Kees. Emotions: An experimental approach. Tilburg, The Netherlands: Triburg University Press, 1991.

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Leidelmeyer, K. Emotions: An experimental approach. [Tilburg]: Tilburg University Press, 1991.

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Breuer, Shlomo. Numerical mathematics: A laboratory approach. Cambridge [England]: Cambridge University Press, 1993.

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Maron, Melvin. Numerical analysis: A practical approach. 3a ed. USA: Wadsworth, 1991.

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Capítulos de livros sobre o assunto "Experimental and numerical approach"

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Trabelsi, Sabrine, Zoubeir Bouaziz, Guenael Germain e Anne Morel. "Numerical and Experimental Approach in Assisted Cryogenic Machining". In Design and Modeling of Mechanical Systems - II, 95–102. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17527-0_10.

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Ghouati, O., e J. C. Gelin. "An Inverse Approach for the Identification of Complex Material Behaviours". In Material Identification Using Mixed Numerical Experimental Methods, 93–102. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-1471-1_10.

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Zajac, Roman, Václav Otipka, Aleš Prokop e Kamil Řehák. "Vibroacoustic Diagnostics Based on the Experimental and Numerical Approach". In Springer Proceedings in Physics, 415–24. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54136-1_42.

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Hoefnagels, J. P. M., M. Kolluri, J. A. W. van Dommelen e M. G. D. Geers. "An in-situ experimental-numerical approach for interface delamination characterization". In Experimental and Applied Mechanics, Volume 6, 569–76. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0222-0_68.

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Yamagata, Nobuki, e Masakazu Ichimiya. "Numerical Approach of Viscous Flow Containing Short Fiber by SPH Method". In Computational and Experimental Simulations in Engineering, 301–7. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_28.

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Milković, Dragan, Goran Simić, Saša Radulović, Vojkan Lučanin e Aleksandra Kostić. "Experimental Approach to Assessment of Safety Against Derailment of Freight Wagons". In Experimental Research and Numerical Simulation in Applied Sciences, 233–49. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-19499-3_13.

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Hentati, Hamdi, Yosra Kriaa, Gregory Haugou e Fahmi Chaari. "Brittle Fracture: Experimental and Numerical Modeling Using Phase-Field Approach". In Design and Modeling of Mechanical Systems—III, 1061–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66697-6_104.

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Shak, Md A. A., A. M. Bayomy, S. B. Dworkin, J. Wang e M. Z. Saghir. "Thermal Behavior of Phase Change Material (PCM) Inside a Cavity: Numerical Approach". In Computational and Experimental Simulations in Engineering, 99–104. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_10.

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Kablar, Natasa. "Mathematical Modelling Approach of WntSignalling PATHWAY Analyse in Alzheimer Disease". In Experimental and Numerical Investigations in Materials Science and Engineering, 193–207. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99620-2_15.

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Yoshioka, Keita, Mathias Nest, Daniel Pötschke, Amir Shoarian Sattari, Patrick Schmidt e David Krach. "Numerical Platform". In GeomInt–Mechanical Integrity of Host Rocks, 63–95. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61909-1_3.

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AbstractAn essential scientific goal of the GeomInt project is the analysis of potentials and limitations of different numerical approaches for the modelling of discontinuities in the rocks under consideration in order to improve the understanding of methods and their synergies with regard to theoretical and numerical fundamentals. As numerical methods, the “Lattice Element Method” (LEM), the non-continuous discontinuum methods “Discrete Element Method” (DEM), the “Smoothed Particle Hydrodynamics” (SPH), the “Forces on Fracture Surfaces” (FFS) as well as the continuum approaches “Phase-Field Method” (PFM), “Lower-Interface-Method” (LIE), “Non-Local Deformation” (NLD) and the “Hybrid-Dimensional Finite-Element-Method” (HDF) will be systematically investigated and appropriately extended based on experimental results (Fig. 3.1).
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Trabalhos de conferências sobre o assunto "Experimental and numerical approach"

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Lau, P. "Analytical, numerical and bench tests of axles in rail vehicles". In Experimental Mechanics. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902578-7.

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Abstract. On the basis of experimental, analytical and numerical tests, a strength analysis of a rail vehicle axle was presented, as well as an alternative approach to this type of issue. The axle of the wheelset was tested on the experimental stand. Then, analytical calculations of the tested axis were performed in accordance with the EN 13 103-1 standard in the sections where strain gauges were located during the stand test. A numerical model was also created in a program based on the Finite Element Method. The obtained results were compared and summarized. It turned out that the results from all studies coincided, which suggests that each of the methods used is correct. None of the obtained values exceeded the permissible fatigue stresses.
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Kumar, Chandan, Mohan Makana, Felix Regin, Amit Garg e Durga Prasad Pedamallu. "Windshield Defrosting Analysis: A Numerical and Experimental Approach". In International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-28-0115.

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Koc, Suzan, Mehmet Ak e Huseyin Vural. "Characterization of power cartridges - An experimental and numerical approach". In 35th Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-2421.

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Teixeira, André F. L., Nuno T. D. Couto e Sandra C. F. Teixeira. "Syngas Combustion Analysis Using an Experimental and Numerical Approach". In ASME 2014 Power Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/power2014-32092.

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The present study addresses SYNGAS combustion in static chamber, using both experimental and numerical approaches, in order to derive the quenching distance and heat flux in laminar syngas–air flames. Three typical mixtures of H2, CO, CH4, CO2 and N2 are considered as representative of the syngas coming from wood gasification, and its laminar combustion will be performed in a static spherical vessel. A two dimensional CFD model is used and validated under experimental runs. The classical Woschni model based on the hypotheses of forced convection and the Rivère model based on kinetic theory of gases are included in the CFD approach. The paper considers two different approaches for chemical reactions: the use of eight reactions and the multizone model. Temperature and pressure analysis is also being carried out. The numerical results are in good agreement with experimental ones. This study could be very useful in predicting the physical conditions of the quenching distance where the measurement is not possible such as in engines and the possibility of using this model in internal combustion engines.
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VanderVeer, Joseph R., e Yogesh Jaluria. "HYBRID EXPERIMENTAL-NUMERICAL APPROACH TO SOLVE INVERSE CONVECTION PROBLEMS". In Proceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer. Connecticut: Begellhouse, 2012. http://dx.doi.org/10.1615/ichmt.2012.cht-12.770.

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ESPANHOL PEREIRA, Catarina Sofia. "Bending of third generation steel: Experimental and numerical approach". In Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-133.

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Abstract. The development of a new class of material, such as third-generation advanced high-strength steel, requires a deep understanding of mechanical behaviour before its use in industry. One of the critical issues in sheet metal forming processes is dimensional accuracy, which is strongly dependent on the elastic recovery that can manifest itself as springback or spring forward [1]. This undesired defect results from the materials parameters and/or tools geometries [2]. One common way to evaluate the springback/forward is through bending tests. This work aims to investigate the existence of springback/forward on the selected material, its magnitude and dependence on the tool geometry and test the performance of the commercial finite element software Abaqus 2017 to predict the observed behaviour. The 3rd GEN steel, CR980XG3TM produced by US Steel is subjected to V-bending to evaluate the existence of springback or spring-forward. Furthermore, to evaluate the dependence of springback/forward on the tool’s geometry, the V-bending tools with different bending angles (namely, 60º and 90º) and different punch radii (namely, 5º and 10º) are used. The load is applied by a Shimadzu AG-X plus 100kN, and the deformation is measured by digital image correlation (DIC) using the GOM ARAMIS 3D 5M system. Numerical analysis of the bending tests is made using Abaqus 2017 software. The experimental results show that the material exhibits springback and spring forward depending on the tool geometry. The strain distribution through the thickness is correlated with the springback/forward.
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Verma, Tikendra Nath, Huirem Neeranjan Singh e Prerana Nashine. "Investigation of bearing characteristic number by experimental and numerical approach". In 2017 8th Annual Industrial Automation and Electromechanical Engineering Conference (IEMECON). IEEE, 2017. http://dx.doi.org/10.1109/iemecon.2017.8079606.

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Sekita, M., H. Tamura, B. Vandenplas e W. Hendricx. "A Combined Experimental - Numerical Approach for Motorcycle Crank Noise: Modeling". In International Body Engineering Conference & Exhibition and Automotive & Transportation Technology Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-2209.

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Jonckheere, Stijn, Marianna Vivolo, Bert Pluymers, Dirk Vandepitte e Wim Desmet. "Vibro-Acoustic Characterisation of Lightweight Structures: A Numerical-Experimental Approach". In 7th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2012. http://dx.doi.org/10.4271/2012-01-1526.

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Riccio, G., P. Adami, F. Martelli, D. Cecchini e L. Carrai. "Improvement of Gas Turbine Injection Systems by Combined Experimental/Numerical Approach". In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30101.

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An aerodynamic study for the premixing device of an industrial turbine gas combustor is discussed. The present work is based on a joint application of numerical CFD and experimental investigation tools in order to verify and optimize the combustor gaseous fuel injection system. The objective is the retrofit of an old generation gas turbine combustion chamber that is carried out considering new targets of NOx emission keeping the same CO and combustion stability performances. CFD has been used to compare different premixing duct configurations for improved mixing features. Experimental test has been carried out in order to assess the pollutant emissions, flame stability and pattern factor characteristics of the full combustion chamber retrofitted with the modified injection system.
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Relatórios de organizações sobre o assunto "Experimental and numerical approach"

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Wang, Yao, Mirela D. Tumbeva e 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 e Imad Al-Qadi. Truck-Platooning Impacts on Flexible Pavements: Experimental and Mechanistic Approaches. Illinois Center for Transportation, novembro de 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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Tuller, Markus, Asher Bar-Tal, Hadar Heller e Michal Amichai. Optimization of advanced greenhouse substrates based on physicochemical characterization, numerical simulations, and tomato growth experiments. United States Department of Agriculture, janeiro de 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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Rose e Luo. L52069 Guided Wave Sizing and Discrimination for SCC Magnetostriction ILI Inspection. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), janeiro de 2003. http://dx.doi.org/10.55274/r0011179.

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With the goal to be able to inspect a large area of the pipe from a single sensor position, hence the development of what we call guided wave inspection. From one point on the circumference of the pipe, it is therefore proposed to inspect the entire circumferential area of the pipe. This approach leads to inspection efficiency.� Experimental techniques cannot be developed on a trial and error basis. The purpose of this work is therefore to develop a guided wave propagation model and subsequent numerical solutions to assist in the �theoretically driven� sensor design and data acquisition systems for improved nondestructive testing including defect detection, location, and potential classification and sizing analysis in a pipe.
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Wilson, D., Vladimir Ostashev, Michael Shaw, Michael Muhlestein, John Weatherly, Michelle Swearingen e Sarah McComas. Infrasound propagation in the Arctic. Engineer Research and Development Center (U.S.), dezembro de 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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Wallis. L51614 Slug Frequency in Horizontal Gas-Liquid Flow. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), fevereiro de 1990. http://dx.doi.org/10.55274/r0011058.

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This report responds to A.G.A.s objective of initiating and planning means to create a reliable, mechanistic method of slug frequency prediction. Specific objectives were to: Update the prior review of existing knowledge Identify one or more alternative modelling approaches Recommend additional work if required Examination of empirical correlations for slug frequency shows that they have uncertainties which are large compared with experimental data. A mechanistic approach is sought. Previous mechanistic models have been either incomplete or numerically unstable. Several improvements were made to the Taitel-Dukler model for this process and a new calculation procedure developed using the method of characteristics. It is demonstrated here that this approach alone cannot lead to cyclic slug formation. The processes of wave growth continually wash out downstream without causing new slugs to form upstream. This has led to concentration on the mechanism of slug formation near the inlet to a pipe segment.
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Al-Qadi, Imad, Jaime Hernandez, Angeli Jayme, Mojtaba Ziyadi, Erman Gungor, Seunggu Kang, John Harvey et al. The Impact of Wide-Base Tires on Pavement—A National Study. Illinois Center for Transportation, outubro de 2021. http://dx.doi.org/10.36501/0197-9191/21-035.

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Researchers have been studying wide-base tires for over two decades, but no evidence has been provided regarding the net benefit of this tire technology. In this study, a comprehensive approach is used to compare new-generation wide-base tires (NG-WBT) with the dual-tire assembly (DTA). Numerical modeling, prediction methods, experimental measurements, and environmental impact assessment were combined to provide recommendations about the use of NG-WBT. A finite element approach, considering variables usually omitted in the conventional analysis of flexible pavement was utilized for modeling. Five hundred seventy-six cases combining layer thickness, material properties, tire load, tire inflation pressure, and pavement type (thick and thin) were analyzed to obtained critical pavement responses. A prediction tool, known as ICT-Wide, was developed based on artificial neural networks to obtain critical pavement responses in cases outside the finite element analysis matrix. The environmental impacts were determined using life cycle assessment. Based on the bottom-up fatigue cracking, permanent deformation, and international roughness index, the life cycle energy consumption, cost, and green-house gas (GHG) emissions were estimated. To make the outcome of this research effort useful for state departments of transportation and practitioners, a modification to AASHTOWare is proposed to account for NG-WBT. The revision is based on two adjustment factors, one accounting for the discrepancy between the AASHTOware approach and the finite element model of this study, and the other addressing the impact of NG-WBT.
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Aursjø, Olav, Aksel Hiorth, Alexey Khrulenko e Oddbjørn Mathias Nødland. Polymer flooding: Simulation Upscaling Workflow. University of Stavanger, novembro de 2021. http://dx.doi.org/10.31265/usps.203.

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There are many issues to consider when implementing polymer flooding offshore. On the practical side one must handle large volumes of polymer in a cost-efficient manner, and it is crucial that the injected polymer solutions maintain their desired rheological properties during transit from surface facilities and into the reservoir. On the other hand, to predict polymer flow in the reservoir, one must conduct simulations to find out which of the mechanisms observed at the pore and core scales are important for field behavior. This report focuses on theoretical aspects relevant for upscaling of polymer flooding. To this end, several numerical tools have been developed. In principle, the range of length scales covered by these tools is extremely wide: from the nm (10-9 m) to the mm (10-3 m) range, all the way up to the m and km range. However, practical limitations require the use of other tools as well, as described in the following paragraphs. The simulator BADChIMP is a pore-scale computational fluid dynamics (CFD) solver based on the Lattice Boltzmann method. At the pore scale, fluid flow is described by classical laws of nature. To a large extent, pore scale simulations can therefore be viewed as numerical experiments, and they have great potential to foster understanding of the detailed physics of polymer flooding. While valid across length scales, pore scale models require a high numerical resolution, and, subsequently, large computational resources. To model laboratory experiments, the NIORC has, through project 1.1.1 DOUCS, developed IORCoreSim. This simulator includes a comprehensive model for polymer rheological behavior (Lohne A. , Stavland, Åsen, Aursjø, & Hiorth, 2021). The model is valid at all continuum scales; however, the simulator implementation is not able to handle very large field cases, only smaller sector scale systems. To capture polymer behavior at the full field scale, simulators designed for that specific purpose must be used. One practical problem is therefore: How can we utilize the state-of-the-art polymer model, only found in IORCoreSim, as a tool to decrease the uncertainty in full field forecasts? To address this question, we suggest several strategies for how to combine different numerical tools. In the Methodological Approach section, we briefly discuss the more general issue of linking different scales and simulators. In the Validation section, we present two case studies demonstrating the proposed strategies and workflows.
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Jury, William A., e David Russo. Characterization of Field-Scale Solute Transport in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, janeiro de 1994. http://dx.doi.org/10.32747/1994.7568772.bard.

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This report describes activity conducted in several lines of research associated with field-scale water and solute processes. A major effort was put forth developing a stochastic continuum analysis for an important class of problems involving flow of reactive and non reactive chemicals under steady unsaturated flow. The field-scale velocity covariance tensor has been derived from local soil properties and their variability, producing a large-scale description of the medium that embodies all of the local variability in a statistical sense. Special cases of anisotropic medium properties not aligned along the flow direction of spatially variable solute sorption were analysed in detail, revealing a dependence of solute spreading on subtle features of the variability of the medium, such as cross-correlations between sorption and conductivity. A novel method was developed and tested for measuring hydraulic conductivity at the scale of observation through the interpretation of a solute transport outflow curve as a stochastic-convective process. This undertaking provided a host of new K(q) relationships for existing solute experiments and also laid the foundation for future work developing a self-consistent description of flow and transport under these conditions. Numerical codes were developed for calculating K(q) functions for a variety of solute pulse outflow shapes, including lognormal, Fickian, Mobile-Immobile water, and bimodal. Testing of this new approach against conventional methodology was mixed, and agreed most closely when the assumptions of the new method were met. We conclude that this procedure offers a valuable alternative to conventional methods of measuring K(q), particularly when the application of the method is at a scale (e.g. and agricultural field) that is large compared to the common scale at which conventional K(q) devices operate. The same problem was approached from a numerical perspective, by studying the feasibility of inverting a solute outflow signal to yield the hydraulic parameters of the medium that housed the experiment. We found that the inverse problem was solvable under certain conditions, depending on the amount of noise in the signal and the degree of heterogeneity in the medium. A realistic three dimensional model of transient water and solute movement in a heterogeneous medium that contains plant roots was developed and tested. The approach taken was to generate a single realization of this complex flow event, and examine the results to see whether features were present that might be overlooked in less sophisticated model efforts. One such feature revealed is transverse dispersion, which is a critically important component in the development of macrodispersion in the longitudinal direction. The lateral mixing that was observed greatly exceeded that predicted from simpler approaches, suggesting that at least part of the important physics of the mixing process is embedded in the complexity of three dimensional flow. Another important finding was the observation that variability can produce a pseudo-kinetic behavior for solute adsorption, even when the local models used are equilibrium.
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Warrick, Arthur W., Gideon Oron, Mary M. Poulton, Rony Wallach e Alex Furman. Multi-Dimensional Infiltration and Distribution of Water of Different Qualities and Solutes Related Through Artificial Neural Networks. United States Department of Agriculture, janeiro de 2009. http://dx.doi.org/10.32747/2009.7695865.bard.

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The project exploits the use of Artificial Neural Networks (ANN) to describe infiltration, water, and solute distribution in the soil during irrigation. It provides a method of simulating water and solute movement in the subsurface which, in principle, is different and has some advantages over the more common approach of numerical modeling of flow and transport equations. The five objectives were (i) Numerically develop a database for the prediction of water and solute distribution for irrigation; (ii) Develop predictive models using ANN; (iii) Develop an experimental (laboratory) database of water distribution with time; within a transparent flow cell by high resolution CCD video camera; (iv) Conduct field studies to provide basic data for developing and testing the ANN; and (v) Investigate the inclusion of water quality [salinity and organic matter (OM)] in an ANN model used for predicting infiltration and subsurface water distribution. A major accomplishment was the successful use of Moment Analysis (MA) to characterize “plumes of water” applied by various types of irrigation (including drip and gravity sources). The general idea is to describe the subsurface water patterns statistically in terms of only a few (often 3) parameters which can then be predicted by the ANN. It was shown that ellipses (in two dimensions) or ellipsoids (in three dimensions) can be depicted about the center of the plume. Any fraction of water added can be related to a ‘‘probability’’ curve relating the size of the ellipse (or ellipsoid) that contains that amount of water. The initial test of an ANN to predict the moments (and hence the water plume) was with numerically generated data for infiltration from surface and subsurface drip line and point sources in three contrasting soils. The underlying dataset consisted of 1,684,500 vectors (5 soils×5 discharge rates×3 initial conditions×1,123 nodes×20 print times) where each vector had eleven elements consisting of initial water content, hydraulic properties of the soil, flow rate, time and space coordinates. The output is an estimate of subsurface water distribution for essentially any soil property, initial condition or flow rate from a drip source. Following the formal development of the ANN, we have prepared a “user-friendly” version in a spreadsheet environment (in “Excel”). The input data are selected from appropriate values and the output is instantaneous resulting in a picture of the resulting water plume. The MA has also proven valuable, on its own merit, in the description of the flow in soil under laboratory conditions for both wettable and repellant soils. This includes non-Darcian flow examples and redistribution and well as infiltration. Field experiments were conducted in different agricultural fields and various water qualities in Israel. The obtained results will be the basis for the further ANN models development. Regions of high repellence were identified primarily under the canopy of various orchard crops, including citrus and persimmons. Also, increasing OM in the applied water lead to greater repellency. Major scientific implications are that the ANN offers an alternative to conventional flow and transport modeling and that MA is a powerful technique for describing the subsurface water distributions for normal (wettable) and repellant soil. Implications of the field measurements point to the special role of OM in affecting wettability, both from the irrigation water and from soil accumulation below canopies. Implications for agriculture are that a modified approach for drip system design should be adopted for open area crops and orchards, and taking into account the OM components both in the soil and in the applied waters.
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