Relevant bibliographies by topics / Design-based simulations

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Design-based simulations'

Author: Grafiati
Published: 3 June 2025
Last updated: 6 July 2025

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Journal articles on the topic "Design-based simulations"

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Miková, Ľubica, Michal Kelemen, Ivan Virgala, and Maroš Michna. "Simulation Model of Manipulator for Model Based Design." Applied Mechanics and Materials 611 (August 2014): 175–82. http://dx.doi.org/10.4028/www.scientific.net/amm.611.175.

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The subject of creation of simulation and mathematical models is nowadays more and more current and its application is in almost every aspect of life. The article deals with compiling a mathematical model of a pivoting arm using Lagrange equations of the second kind. Subsequently, the model will be created in the simulation program Matlab/Simulink. The simulation model will as well be assembled in the program Adams. The results of these simulations will be compared in the conclusion. This article presents a procedure for resolving a mechanical system from the beginning, from creation of a mathematical model through creation of a simulation model up to evaluation of the simulation results. This paper presents a procedure for resolving mechanical system from the beginning. Thus, it is done by creating a mathematical model through the creation of a simulation model to evaluate the results of the simulation. According to these simulations will produce a working model of the manipulator, which could be used for teaching purposes.
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Alviani, Vera, and R. Ramdana. "DESIGN OF ONLINE-BASED STUDY PROGRAM DETERMINATION APPLICATION." Journal of Sustainability Industrial Engineering and Management System 1, no. 1 (2022): 1–5. http://dx.doi.org/10.56953/jsiems.v1i1.7.

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Application simulation for determining study programs based on online and implementing simulations to assist prospective students in choosing study programs at STMIK AKBA Makassar. The tests in this thesis include the DAT (Differential Attitude Test) test. Making this simulation using the PHP programming language and using the Bootstrap Framework where the database uses the MySql database. System testing has been carried out using the Black Box testing method. The results of this study indicate that this application can run well. This simulation does not precisely provide a decision on the problems faced by prospective students in determining the study program but only complements information before making a decision.
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Liu, Hui, Zhiliang Zhang, and Youcheng Pan. "Research on Diversified Visual Communication Design Based on Computer Digital Technology." Advances in Multimedia 2022 (October 11, 2022): 1–12. http://dx.doi.org/10.1155/2022/2573027.

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In order to improve the effect of diversified visual communication, this paper combines computer digital technology to design a multidimensional visual communication system. In order to improve lighting performance, parts of the surface of the secondary processing visually conveyed image have been processed with different diffusing materials, and the effects have been compared in simulations. There are two types of simulations: external simulation and internal simulation. Moreover, the cutting method based on the shape of the lighting area can design a rectangular lighting area, and the diffusing material can improve the lighting performance to a certain extent. In addition to this, according to the shape of the set target plane, a cut visual communication image is obtained. Through multiple simulation experiments, this paper verifies that the diversified visual communication design system based on computer digital technology can effectively improve the visual communication effect.
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Khan, Muhammad Azhar Ali. "Simulation Based Mold Design Optimization of a Spring Flap Casting." Solid State Phenomena 305 (June 2020): 178–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.305.178.

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The complex nature of metal casting process brings about a need to simulate it before undertaken in a foundry. Casting simulations provide insights on flow of molten metal within the mold, solidification sequence, nature and location of defects etc. Moreover, mold design can be optimized to minimize defects without undergoing physical trials-and-errors as previously practiced in traditional metal casting. This study is based on casting an ASTM A216 WCB steel spring flap for automotive suspension system using a simulation based optimized mold design. The initial and optimized mold designs are simulated in MAGMASoft for mold filling, solidification, stress distribution and defects prediction. The results of simulations and actual castings are found to be in good agreement. It is concluded that simulations are accurate in modeling casting process and in predicting defects followed by their minimization through mold design optimization. The use of auxiliary components in a carefully designed mold can lead to a nearly defect-free and high quality cast product.
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Szufel, Przemysław, Bogumił Kamiński, and Piotr Wojewnik. "Controllling Simulation Experiment Design for Agent-Based Models Using Tree Representation of Parameter Space." Foundations of Computing and Decision Sciences 38, no. 4 (2013): 277–98. http://dx.doi.org/10.2478/fcds-2013-0014.

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Abstract An important aspect of the simulation modelling process is sensitivity analysis. In this process, agent-based simulations often require analysis of structurally different parameter specifications - the parameters can be represented as objects and the object-oriented simulation configuration leads to nesting of simulation parameters. The nested parameters are naturally represented as a tree rather than a flat structure. The standard tools supporting multi-agent simulations only allow only the representation of the parameter space as a Cartesian product of possible parameter values. Consequently, their application for the required tree representation is limited. In this paper an approach to tree parameter space representation is introduced with an XML-based language. Furthermore, we propose a set of tools that allows one to manage parameterization of the simulation experiment independently of the simulation model.
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Okada, Naoki, James B. Cole, Shigeki Yamada, Kensuke Ogawa, and Yoshifumi Katayama. "Nonstandard FDTD Simulation-Based Design of CROW Wavelength Splitters." Advances in Optical Technologies 2011 (June 1, 2011): 1–6. http://dx.doi.org/10.1155/2011/265702.

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The finite-difference time-domain (FDTD) algorithm has been used in simulation-based designs of many optical devices, but it fails to reproduce high-Q whispering gallery modes (WGMs). On the other hand, the nonstandard (NS) FDTD algorithm can accurately compute WGMs and can be used to make simulation-based designs of WGM devices. Wavelength splitters using the coupled resonator optical waveguides (CROWs) based on WGM couplings have recently attracted attention because they are potentially ultracompact. In this paper, we design a CROW wavelength splitter using NS FDTD simulations and demonstrate high interchannel extinction ratios of over 20 dB.
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Kato, Takumi, and Ryota Kamoshida. "Multi-Agent Simulation Environment for Logistics Warehouse Design Based on Self-Contained Agents." Applied Sciences 10, no. 21 (2020): 7552. http://dx.doi.org/10.3390/app10217552.

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We propose a multi-agent simulation environment for logistics warehouses. Simulation is a crucial part of designing industrial systems, such as logistics warehouses. A warehouse is a multi-agent system (MAS) that consists of various autonomous subsystems with robots, material-handling equipment, and human workers. It is generally difficult to analyze the performance of a MAS thus, it is important to model a warehouse and conduct simulations to design and evaluate the possible system configurations. However, the cost of modeling warehouses and modifying the models is high because there are various components and interactions compared to conventional multi-agent simulations. We proposed a self-contained agent architecture and message architecture of a multi-agent simulation environment for logistics warehouses to reduce the simulation-model development and modification costs. We quantitatively evaluated our environment in terms of development costs by comparing such costs of our environment and a widely used multi-agent simulation environment.
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Guerrero, Joel, Luca Mantelli, and Sahrish B. Naqvi. "Cloud-Based CAD Parametrization for Design Space Exploration and Design Optimization in Numerical Simulations." Fluids 5, no. 1 (2020): 36. http://dx.doi.org/10.3390/fluids5010036.

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In this manuscript, an automated framework dedicated to design space exploration and design optimization studies is presented. The framework integrates a set of numerical simulation, computer-aided design, numerical optimization, and data analytics tools using scripting capabilities. The tools used are open-source and freeware, and can be deployed on any platform. The main feature of the proposed methodology is the use of a cloud-based parametrical computer-aided design application, which allows the user to change any parametric variable defined in the solid model. We demonstrate the capabilities and flexibility of the framework using computational fluid dynamics applications; however, the same workflow can be used with any numerical simulation tool (e.g., a structural solver or a spread-sheet) that is able to interact via a command-line interface or using scripting languages. We conduct design space exploration and design optimization studies using quantitative and qualitative metrics, and, to reduce the high computing times and computational resources intrinsic to these kinds of studies, concurrent simulations and surrogate-based optimization are used.
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Benkhaoua, Larbi, Smail Mouissat, Mohamed Taoufik Benhabiles, and Mohamed Lahdi Riabi. "Design of subwavelength metamaterial resonator based on new self-coupling strategy." International Journal of Microwave and Wireless Technologies 12, no. 3 (2019): 221–26. http://dx.doi.org/10.1017/s1759078719001259.

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AbstractIn this paper, edge-broad-side coupled spiral resonator (EBC-SR) is proposed to enhance the miniaturization of the metamaterial resonators. After a comparative analysis, it is found that the proposed strategy can drastically reduce the electrical size of metamaterial resonators. This is due to the use, at the same time, advantages of edge coupling, broad-side coupling, and self-coupling. A lumped element equivalent circuit model is proposed for the EBC-SR-loaded transmission line. This model is validated by comparing the results of electromagnetic simulations with the circuit simulations using the extracted parameter values. To validate the proposed strategy, a prototype of the EBC-SR embedded inside a drive loop is fabricated. The experimental results are presented with the simulation results.
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Denkena, B., H. C. Mohring, K. M. Litwinski, and D. Heinisch. "Automated design of fixtures based on FEM simulations." International Journal of Computer Aided Engineering and Technology 3, no. 3/4 (2011): 256. http://dx.doi.org/10.1504/ijcaet.2011.040046.

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Dissertations / Theses on the topic "Design-based simulations"

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Singh, Harpreet. "Computer simulations of realistic microstructures implications for simulation-based materials design/." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22564.

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Thesis (Ph. D.)--Materials Science and Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Dr. Arun Gokhale; Committee Member: Dr. Hamid Garmestani; Committee Member: Dr. Karl Jacob; Committee Member: Dr. Meilin Liu; Committee Member: Dr. Steve Johnson.
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Hardman, Richard H. III. "Systemic Formation: Multi-Agent Simulations for Architecture." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin155351382588639.

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Lin, Yiben. "A quadrature-based technique for robust design with computer simulations." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39699.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2007.<br>Includes bibliographical references (p. 73-76).<br>This thesis presents a method for estimating transmitted variance to enable robust parameter design in computer simulations. This method is based on the Hermite-Gaussian quadrature for a single input. It is extended to multiple variables, in which case, for simulations with n randomly varying inputs, the method requires 4n + 1 samples. For situations in which the polynomial response is separable, it is proven that 1) the method gives exact transmitted variance if the response is up to a fourth-order separable polynomial response and 2) the error of the transmitted variance estimated by the method is smaller than zero if the response is a fifth-order separable polynomial response. For situations in which the polynomial response is not separable, two probability models based on the effect hierarchy principle are used to generate a large number of polynomial response functions. The proposed method and alternative methods are applied to these polynomial response functions to investigate accuracy. For typical populations of problems, it is shown that the method has good accuracy, providing less than 5% error in 90% of cases.<br>(cont.) The proposed method provides much better accuracy than Latin Hypercube Sampling or Hammersley Sequence Sampling assuming these techniques are also restricted to using 4n + 1 samples. Hammersley Sequence Sampling requires at least ten times the number of samples to provide approximately the same degree of accuracy as the quadrature technique. A cubature method provides slightly better accuracy than the proposed method, though it requires n2 + 3n + 3 samples. As an independent check on these results, simulations of five engineering systems are developed and 12 case studies are conducted. Although the predicted accuracy in case-based evaluations is somewhat lower, the data from the case-based evaluations are consistent with the results from the model-based evaluation.<br>by Yiben Lin.<br>Ph.D.
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Chauffour, Marie-Laure. "Shock-based waverider design with pressure gradient corrections and computational simulations." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1829.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Karim, Michael K. "A design template for the development of computer-based instructional simulations." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1298569562.

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Bacciaglia, Antonio <1993&gt. "Advanced voxel-based CAD modelling for FSI simulations for automotive structures design." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10181/1/Antonio_Bacciaglia_thesis.pdf.

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Additive Manufacturing (AM) is nowadays considered an important alternative to traditional manufacturing processes. AM technology shows several advantages in literature as design flexibility, and its use increases in automotive, aerospace and biomedical applications. As a systematic literature review suggests, AM is sometimes coupled with voxelization, mainly for representation and simulation purposes. Voxelization can be defined as a volumetric representation technique based on the model’s discretization with hexahedral elements, as occurs with pixels in the 2D image. Voxels are used to simplify geometric representation, store intricated details of the interior and speed-up geometric and algebraic manipulation. Compared to boundary representation used in common CAD software, voxel’s inherent advantages are magnified in specific applications such as lattice or topologically structures for visualization or simulation purposes. Those structures can only be manufactured with AM employment due to their complex topology. After an accurate review of the existent literature, this project aims to exploit the potential of the voxelization algorithm to develop optimized Design for Additive Manufacturing (DfAM) tools. The final aim is to manipulate and support mechanical simulations of lightweight and optimized structures that should be ready to be manufactured with AM with particular attention to automotive applications. A voxel-based methodology is developed for efficient structural simulation of lattice structures. Moreover, thanks to an optimized smoothing algorithm specific for voxel-based geometries, a topological optimized and voxelized structure can be transformed into a surface triangulated mesh file ready for the AM process. Moreover, a modified panel code is developed for simple CFD simulations using the voxels as a discretization unit to understand the fluid-dynamics performances of industrial components for preliminary aerodynamic performance evaluation. The developed design tools and methodologies perfectly fit the automotive industry’s needs to accelerate and increase the efficiency of the design workflow from the conceptual idea to the final product.
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Zapata, Usandivaras Jose. "Surrogate models based on large eddy simulations and deep learning for coaxial rocket engine injector design." Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0024.

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La conception des fusées est soumise à une pression croissante pour réduire leurs coûts de développement. L’utilisation de la CFD pour la simulation des processus de combustion des moteurs-fusées (LRE) peut constituer une alternative économique aux coûteuses expériences. Pourtant, une approche holistique pour la conception préliminaire avec la CFD n’est pas encore pratique. Des modèles de substitution appropriés peuvent contourner ce dilemme grâce à des temps de restitution rapides, sans perte de précision significative. La conception d’un injecteur a un impact direct sur l’efficacité de la combustion et les charges thermiques. Dans ce travail, nous procédons à l’évaluation des stratégies appelées data-driven pour obtenir des modèles de substitution des injecteurs coaxiaux. Un accent particulier est mis sur les techniques supervisées d’apprentissage profond (DL). Nous commençons par réaliser une validation du concept, en construisant une base de données de ∼3600 simulations 2D axisymétriques RANS (Reynolds Averaged Navier Stokes) d’injecteurs coaxiaux couvrant un espace de paramètres à 9 dimensions, comprenant la géométrie et le régime de combustion. Des modèles de quantités scalaires d’intérêt (QoI), du profil de flux de chaleur de paroi 1D et de champ de température moyen 2D, sont formés et validés. Les modèles utilisent des réseaux neuronaux entièrement connectés (FCNN), et un U-Net adapté pour le cas 2D. Les résultats se comparent bien à d’autres méthodes établies sur l’ensemble des données d’essai. L’approche RANS présente des lacunes évidentes lorsqu’il s’agit d’applications de combustion turbulente. Au lieu de cela, les simulations aux grandes échelles (LES), sont en principe mieux adaptées à la modélisation de la combustion turbulente. La méthodologie déployée sur les données RANS est donc appliquée sur une base de données de ∼100 LES d’injecteurs couvrant un espace de conception 3D, à un coût par échantillon beaucoup plus élevé que RANS. En raison des coûts de calculs élevés, des maillages grossiers ainsi que d’autres simplifications sont adoptés pour la génération de cette base de données LES, qui est ainsi qualifiée de basse fidélité (LF). Les FCNN et les U-Nets sont utilisés pour obtenir des modèles de substitution des QoI scalaires etdes champs stationnaires 2D avec des performances satisfaisantes pour la tâche de prédiction LF. Afin d’améliorer la qualité des modèles obtenus au sens de leur capacité à décrire les phénomènes physiques, sans pour autant devoir les entraîner sur des simulations plus raffinées et coûteuses, une approche multifidélité (MF) est envisagée en tirant parti de l’apprentissage par transfert inductif sur les U-Nets. Les modèles sont réentraînés et validés sur un ensemble plus petit de ∼10 échantillons de haute fidélité (HF). Le modèle MF donne de bons résultats dans la tâche de prédiction HF sur les échantillons de test, avec la topologie de flamme souhaitée, à un coût de calcul bien inférieur à ce qu’aurait coûté uniquement sur des données HF. Par ailleurs, les informations liées au comportement dynamique restituées par la LES sont exploitées pour le développement de modèles d’ordre réduit pour la prédiction spatio-temporelle de l’écoulement réactif. Nous développons des émulateurs d’un injecteur LRE au moyen d’autoencodeurs convolutifs (CNN-AE) et d’un multilayer perceptron (MLP). Le contenu spectral reconstruit du signal surpasse celui d’une POD équivalente, ce qui démontre la capacité de compression supérieure du CNN-AE. Cependant, des problèmes de régularité sont soulevés lors de la propagation de l’émulateur au-delà de l’horizon d’apprentissage. Enfin, ce travail met en évidence les défis et les opportunités de l’utilisation de la DL pour la prédiction des caractéristiques stationnaires et dynamiques des données LES de l’écoulement réactif dans un injecteur de moteur fusée<br>The design of rocket propulsion systems is under growing pressure of reducing development costs. The use of CFD codes for the simulation of rocket engine combustion processes can provide an economical alternative to costly experiments which have traditionally been at the core of liquid rocket engines (LREs) development. Nonetheless, a holistic approach for preliminary design analysis and optimization is not yet practical, as the exploration of the entire engine design space via high-fidelity numerical simulations is intractable. Appropriate surrogate models may circumvent this dilemma through fast restitution times, without significant accuracy loss. The liquid rocket engine injector is a key subsystem within the LRE, whose design directly impacts flame development, combustion efficiency, and thermal loads. The multiscale nature of turbulent, non-premixed combustion, makes the modeling of injection, particularly complex. In this work, we proceed to evaluate data driven strategies for obtaining surrogate models of LRE shear coaxial injectors. A specific emphasis is taken on supervised, deep learning (DL) techniques for regression tasks. The base injector configuration is inspired on an existing experimental rocket combustor from TUM, operating with a GOx/GCH 4 mixture. We begin by conducting a proof-of-concept (PoC), by offline sampling a database of ∼3600 Reynolds Averaged Navier Stokes (RANS), 2D axisymmetric simulations of single element coaxial injectors spanning a 9 dimensional parameter space comprising geometry and combustion regime. Subsequent models of scalar quantities of interest (QoIs),1D wall heat flux profile, and 2D average temperature field are trained and validated. The models use Fully Connected Neural Networks and an adapted U-Net for the 2D case. The results perform well against other established surrogate modeling methods over the test dataset. The RANS approach has evident shortcomings when dealing with turbulent combustion applications. Instead, Large Eddy Simulations (LES), are in principle, better suited to model turbulent combustion, while furnishing information about dynamical flow features. We proceed to replicate the (PoC) efforts, albeit on a database of ∼100 LES of shear coaxial injectors spanning a 3D design space, at a much larger cost per sample than RANS. A dedicated LES data generation pipeline is put in place. Due to the cost, the LES are low-fidelity (LF) in view of the modeling simplifications, i.e. coarse meshes, global chemistry, etc. CNNs and U-Nets are used to obtain surrogate models of scalar QoIs and 2D stationary fields with satisfactory performance over the LF prediction task. To improve the overall fidelity of the surrogate, a multi-fidelity (MF) approach is considered by leveraging inductive transfer learning over our U-Nets. The decoding layers are retrained and validated over a smaller pool of ∼10 of high-fidelity (HF) samples, i.e. finer resolution. The MF surrogate performs well in the HF prediction task over the test samples, with the desired flame topology, at a lower computational cost of the offline sampling stage. The dynamic data of LES, motivates the development of reduced order models (ROMs) for the spatio-temporal prediction of the injector flame. We develop emulators of a LRE injector flame by means of convolutional autoencoders (CNN-AE) and multi-layer perceptron (MLP) for propagating in time the latent vectors. The reconstructed spectral content of the signal outperforms that of a standard POD with equal latent space dimension, demonstrating the superior compression capability of the CNN-AE. However, manifold regularity concerns are raised when propagating the emulator beyond the training horizon. Finally, this work evidences the challenges and opportunities of the use of DL for the prediction of stationary and dynamical features of LES data for a complex reactive flow configuration of a LRE coaxial injector
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Vignetti, Matteo Maria. "Thermal simulations and design guidelines on multi-finger PAs based on 28nm FD-SOI technology." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142677.

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The electrical performance of Silicon-On-Insulator (SOI) devices can be dramatically enhanced in terms of reduced parasitic capacitances, leakage current and power consumption. On the other hand, self-heating effects (SHE) are more pronounced than in a bulk device because of the buried oxide which limits power dissipation through the substrate. This issue is particularly important in the design of power amplifiers (PAs) for mobile applications where excellent RF performance is required while at the same time the current carrying capability of the devices have to be very high. In the present work the thermal behavior of multi-finger FDSOI-MOSFET power amplifiers has been investigated and thermal design guidelines have been proposed. Nano-scale thermal conduction and heat generation in nano-devices have been preliminarily studied in order to account for nano-scale effects. A finite element analysis model (FEA model) has been realized in the COMSOL multi-physics environment. Thermal simulations have been performed and the thermal behaviour of the simulated devices with respect to geometrical parameters has been studied. Based on the simulation results, thermal design guidelines have been proposed and a PA unit cell design has been presented. LVT device having a pitch p = 130nm has found to be the best choice for the design of a multifinger MOSFET power amplifier and it has been adopted as the core for the design of a unit cell. Such a unit cell has been used for the design of a power amplifier to be manufactured in the first tape-out for the Dynamic-ULP project.
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Ploé, Patrick. "Surrogate-based optimization of hydrofoil shapes using RANS simulations." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0012/document.

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Cette thèse présente un framework d’optimisation pour la conception hydrodynamique de forme d’hydrofoils. L’optimisation d’hydrofoil par simulation implique des objectifs d’optimisation divergents et impose des compromis contraignants en raison du coût des simulations numériques et des budgets limités généralement alloués à la conception des navires. Le framework fait appel à l’échantillonnage séquentiel et aux modèles de substitution. Un modèle prédictif est construit en utilisant la Régression par Processus Gaussien (RPG) à partir des données issues de simulations fluides effectuées sur différentes géométries d’hydrofoils. Le modèle est ensuite combiné à d’autres critères dans une fonction d’acquisition qui est évaluée sur l’espace de conception afin de définir une nouvelle géométrie qui est testée et dont les paramètres et la réponse sont ajoutés au jeu de données, améliorant ainsi le modèle. Une nouvelle fonction d’acquisition a été développée, basée sur la variance RPG et la validation croisée des données. Un modeleur géométrique a également été développé afin de créer automatiquement les géométries d’hydrofoil a partir des paramètres déterminés par l’optimiseur. Pour compléter la boucle d’optimisation,FINE/Marine, un solveur fluide RANS, a été intégré dans le framework pour exécuter les simulations fluides. Les capacités d’optimisation ont été testées sur des cas tests analytiques montrant que la nouvelle fonction d’acquisition offre plus de robustesse que d’autres fonctions d’acquisition existantes. L’ensemble du framework a ensuite été testé sur des optimisations de sections 2Dd’hydrofoil ainsi que d’hydrofoil 3D avec surface libre. Dans les deux cas, le processus d’optimisation fonctionne, permettant d’optimiser les géométries d’hydrofoils et confirmant les performances obtenues sur les cas test analytiques. Les optima semblent cependant être assez sensibles aux conditions opérationnelles<br>This thesis presents a practical hydrodynamic optimization framework for hydrofoil shape design. Automated simulation based optimization of hydrofoil is a challenging process. It may involve conflicting optimization objectives, but also impose a trade-off between the cost of numerical simulations and the limited budgets available for ship design. The optimization frameworkis based on sequential sampling and surrogate modeling. Gaussian Process Regression (GPR) is used to build a predictive model based on data issued from fluid simulations of selected hydrofoil geometries. The GPR model is then combined with other criteria into an acquisition function that isevaluated over the design space, to define new querypoints that are added to the data set in order to improve the model. A custom acquisition function is developed, based on GPR variance and cross validation of the data.A hydrofoil geometric modeler is also developed to automatically create the hydrofoil shapes based on the parameters determined by the optimizer. To complete the optimization loop, FINE/Marine, a RANS flow solver, is embedded into the framework to perform the fluid simulations. Optimization capabilities are tested on analytical test cases. The results show that the custom function is more robust than other existing acquisition functions when tested on difficult functions. The entire optimization framework is then tested on 2D hydrofoil sections and 3D hydrofoil optimization cases with free surface. In both cases, the optimization process performs well, resulting in optimized hydrofoil shapes and confirming the results obtained from the analytical test cases. However, the optimum is shown to be sensitive to operating conditions
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Nordhoff, Helga Irene. "The design and implementation of a computer-based course using Merrill's model of instructional design." Thesis, Pretoria : [s.n.], 2002. http://upetd.up.ac.za/thesis/available/etd-08022002-094043/.

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Books on the topic "Design-based simulations"

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Han, Xu, and Jie Liu. Numerical Simulation-based Design. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-10-3090-1.

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Le, Xiaobin. Simulation-Based Mechanical Design. Springer Nature Switzerland, 2025. http://dx.doi.org/10.1007/978-3-031-64132-9.

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Rao, J. S. Simulation Based Engineering in Fluid Flow Design. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-46382-7.

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United States. National Aeronautics and Space Administration., ed. Design for dependability: A simulation-based approach. Coordinated Science Laboratory, College of Engineering, University of Illinois at Urbana-Champaign, 1994.

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Zhang, Bao-Ji, and Sheng-Long Zhang. Research on Ship Design and Optimization Based on Simulation-Based Design (SBD) Technique. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-8423-2.

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Orth, H. Model-based design of water distribution and sewage systems. Wiley, 1986.

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Koziel, Slawomir, and Leifur Leifsson. Simulation-Driven Design by Knowledge-Based Response Correction Techniques. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30115-0.

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de Jong, Ton, and Luigi Sarti, eds. Design and Production of Multimedia and Simulation-based Learning Material. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0942-0.

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Jong, Ton. Design and Production of Multimedia and Simulation-based Learning Material. Springer Netherlands, 1994.

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1956-, Jong Ton de, Sarti Luigi 1953-, and EG-Programm DELTA, eds. Design and production of multimedia and simulation-based learning material. Kluwer, 1994.

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Book chapters on the topic "Design-based simulations"

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Copps, Jeffrey, Richard F. Murphy, and Sandor Lovas. "Molecular Dynamics Simulations of Peptides." In Peptide-Based Drug Design. Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-419-3_7.

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Pieber, Thomas Wolfgang, Thomas Ulz, and Christian Steger. "Model-Based Design of Secured Power Aware Smart Sensors." In Sensor Systems Simulations. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16577-2_8.

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Böß, Volker, Berend Denkena, Sven Friebe, and Markus Hein. "Simulation-Based Process Design of Recontouring Technologies." In Regeneration of Complex Capital Goods. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-51395-4_13.

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AbstractEngine manufacturers generate about 50% of their total turnover with maintenance. Damaged parts can either be replaced by spare parts or can be regenerated by e.g. local welding processes. One major step of the manufacturing part of the process chain for regeneration after the material deposition is the removal of excess weld material by cutting, which is called recontouring. Recontouring is often the last process step, which defines the final surface integrity and thus the performance of the repaired parts. Thereby, each component has a batch size of one by reason of individuality. In industrial praxis, the recontouring is done mainly with high manual effort. This results in uncertain and unreproducible repair processes for each component. Hence, a major challenge for recontouring processes is the reduction of the required manual effort by an automated method. In the subproject C1 “simulation-based process design of recontouring technologies”, machining investigations and technological simulations were applied in combination with suitable models for a process adaption in order to reach the required workpiece properties. A special focus was the transition from the undamaged area to the deposited material. Furthermore, a method for effective process planning was developed for the generation of 5-axis milling tool paths. This increases the effectiveness of the process planning by adapting them to the individual shape of the component. The present paper gives an overview of the main results of the investigation of methods for the individual process planning of recontouring technologies based on process simulations. This includes the development of an algorithm for the automatic planning of the recontouring process. A Dexel-based simulation method was developed and experimentally validated which allows the prognosis of the geometrical shape of the material deposition. Based on that, the influence of the resulting material allowance on the recontouring was studied. The aim was the generation of a part quality that satisfies the requirements of the functional review. The evaluation of the part quality was conducted by a Dexel-based technological process simulation of the recontouring process. This allowed the prediction of the workpiece surface as well as the research of the influence of the process parameters on the main residual stresses.
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Zhao, Chao, Mengjie Hu, Zhenghu Zhu, Cheng Yang, Zhikui Wang, and Xu Long. "Design of RF Micro-system Based on Multi-chip Stacking." In Computational and Experimental Simulations in Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-44947-5_82.

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Dimara, Asimina, Stelios Krinidis, Dimosthenis Ioannidis, and Dimitrios Tzovaras. "Building Performance Simulation." In Disrupting Buildings. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-32309-6_4.

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AbstractSimulation is a proven technique that uses computational, mathematical, and machine learning models to represent the physical characteristics, expected or actual operation, and control strategies of a building and its energy systems. Simulations can be used in a number of tasks along the deep renovation life cycle, including: (a) integrating simulations with other knowledge-based systems to support decision-making, (b) using simulations to evaluate and compare design scenarios, (c) integrating simulations with real-time monitoring and diagnostic systems for building energy management and control, (d) integrating multiple simulation applications, and (e) using virtual reality (VR) to enable digital building design and operation experiences. While building performance simulation is relatively well established, there are numerous challenges to applying it across the renovation life cycle, including data integration from fragmented building systems, and modelling human-building interactions, amongst others. This chapter defines the building performance simulation domain outlining significant use cases, widely used simulation tools, and the challenges for implementation.
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Chernikova, Olga, Nicole Heitzmann, Ansgar Opitz, Tina Seidel, and Frank Fischer. "A Theoretical Framework for Fostering Diagnostic Competences with Simulations in Higher Education." In Learning to Diagnose with Simulations. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-89147-3_2.

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AbstractThis chapter presents an overview of the theoretical and empirical evidence on the effectiveness of simulation-based learning in higher education for learners in the domains of medical and teacher education. First and foremost, it presents a theoretical framework for fostering diagnostic competences in simulation-based environments. This theoretical framework was utilized to develop the simulations described in this book and contribute to generating further empirical evidence on the effective design of simulation-based learning environments in the context of diagnosis. Moreover, this chapter presents insights from a meta-analytic study supporting the importance of learners’ individual prerequisites as well as the instructional and contextual factors described in the model.
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Albers, Karsten, Benjamin Bolte, Max-Arno Meyer, Axel Terfloth, and Anna Wißdorf. "Tool Support for Co-Simulation-Based Analysis." In Model-Based Engineering of Collaborative Embedded Systems. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62136-0_13.

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AbstractThe development of collaborative embedded systems (CESs) requires the validation of their runtime behavior during design time. In this context, simulation-based analysis methods play a key role in the development of such systems. Simulations of CESs tend to become complex. One cause is that CESs work in collaborative system groups (CSGs) within a dynamic context., which is why CESs must be simulated as participants of a CSG. Another cause stems from the fact that CES simulations cover various cyber-physical domains. The models incorporated are often managed by different tools that are specialized for specific simulation disciplines and must be jointly executed in a cosimulation. Besides the methodological aspects, the interoperability of models and tools within such a co-simulation is a major challenge. This chapter focusses on the tool integration aspect of enabling co-simulations. It motivates the need for co-simulation for CES development and describes a general tool architecture. The chapter presents the advantages and limitations of adopting existing standards such as FMI and DCP, as well as best practices for integrating simulation tools and models for CESs and CSGs.
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Hazrat Ali, Md, and Anuar Abilgaziyev. "Fused Deposition Modeling Based 3D Printing: Design, Ideas, Simulations." In Materials Forming, Machining and Tribology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68024-4_2.

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Du, Bingjie, Xin Zhao, and Hao Li. "Optimal Design for Toggle Brace Damper Systems Based on Virtual VD Modal." In Computational and Experimental Simulations in Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_45.

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Fink, Maximilian C., Victoria Reitmeier, Matthias Siebeck, Frank Fischer, and Martin R. Fischer. "Live and Video Simulations of Medical History-Taking: Theoretical Background, Design, Development, and Validation of a Learning Environment." In Learning to Diagnose with Simulations. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-89147-3_9.

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AbstractHistory-taking is an essential diagnostic situation and has long been an important objective of medical education in European countries and beyond. Thus, the research project presented here investigates facilitating diagnostic competences in live and video history-taking simulations. In this chapter, the theoretical background and the design, development, and validation process of the learning environment for this research project are described. In the first section, an overview of history-taking models is provided, the concept of diagnostic competences for history-taking is specified, and a summary of research on simulation-based learning and assessment of history-taking is given. The second section reports on the creation of knowledge tests and the live and video simulations. In the third section, results from a pilot study and an expert workshop are disclosed and findings from a validation study are provided. These findings indicate that the created simulations and knowledge tests measure separate but related aspects of diagnostic competences reliably and validly and may be used for assessment. In the final section, a summary is provided and future questions for research are presented with a focus on the adaptivity of scaffolds and simulation-based learning from atypical cases.
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Conference papers on the topic "Design-based simulations"

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Ninković, Anđela N., and Branko Kolundžija. "Analytical CAD formulas for design of microstrip patch antennas based on numerical simulations." In 2024 32nd Telecommunications Forum (TELFOR). IEEE, 2024. https://doi.org/10.1109/telfor63250.2024.10819165.

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Ruan, Jiuhong, and Yibin Li. "ADRC Based Ship Course Controller Design and Simulations." In 2007 IEEE International Conference on Automation and Logistics. IEEE, 2007. http://dx.doi.org/10.1109/ical.2007.4339044.

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Jiuhong Ruan, Zuowei Li, Fengyu Zhou, and Yibin Li. "ADRC based ship tracking controller design and simulations." In 2008 IEEE International Conference on Automation and Logistics (ICAL). IEEE, 2008. http://dx.doi.org/10.1109/ical.2008.4636442.

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Goldstein, Rhys, and Gabriel Wainer. "DEVS-based design of spatial simulations of biological systems." In 2009 Winter Simulation Conference - (WSC 2009). IEEE, 2009. http://dx.doi.org/10.1109/wsc.2009.5429688.

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Oxman, Rivka. "Performance-Based Design Geeration." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59229.

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On the basis of analysis of the current state of the art key concepts and issues in the application of performance-based design in architecture are defined. Future directions for performance-based model that couple principles of evaluation and generation are proposed. Here generative and modifications of a design can be automatically achieved employing processes controlled by analytical and numeric findings. Instead of simulating the performance of a design, and re-design it after analysis and evaluation, it may be possible to directly inform, generate and automatically modify the design using performance-based simulations. The ability to directly manipulate the geometric properties of the digital model is defined and demonstrated.
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Kumar, Shashank, Matthias Herzkamp, and Stefan van Waasen. "SiPM-based neutron detector design: validation of Geant4 simulations." In Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, edited by Arnold Burger, Ralph B. James, and Stephen A. Payne. SPIE, 2019. http://dx.doi.org/10.1117/12.2526879.

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Ambak, Zulkifli, Rosidah Alias, Azmi Ibrahim, et al. "An LTCC design technique based on FDTD EM simulations." In 2007 Asia-Pacific Conference on Applied Electromagnetics (APACE). IEEE, 2007. http://dx.doi.org/10.1109/apace.2007.4603939.

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Schupfer, Florian, Carna Radojicic, Joseph Wenninger, and Christoph Grimm. "System refinement design flow based on semi-symbolic simulations." In AFRICON 2011. IEEE, 2011. http://dx.doi.org/10.1109/afrcon.2011.6072111.

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Alfaro-Isac, C., A. Juan-Alejandre, and S. Izquierdo. "Tensor-Decomposition-Based Sequential Design of Experiments for Computer Simulations." In 10th International Conference on Adaptative Modeling and Simulation. CIMNE, 2021. http://dx.doi.org/10.23967/admos.2021.076.

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Shao, Tiefu, and Sundar Krishnamurty. "Modeling Implications in Simulation-Based Design of Stents." In ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99493.

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Variations associated with stenting systems, artery properties, and doctor skills necessitate a better understanding of coronary artery stents so as to facilitate the design of stents that are customized to individual patients. This paper presents the development of an integrated computer simulation-based design approach using engineering finite element analysis (FEA) models for capturing stent knowledge, utility theory-based decision models for representing the design preferences, and statistics-based surrogate models for improving process efficiency. Two focuses of the paper are: 1) understanding the significance of engineering analysis and surrogate models in the simulation-based design of medical devices; 2) investigating the modeling implications in the context of stent design. The study reveals that the advanced nonlinear FEA software with analysis capacities on large deformation and contact interaction has offered a platform to execute high fidelity simulations, yet the selection of appropriate analysis models is still subject to the tradeoff between cost of analysis and accuracy of solution; the cost-prohibitive simulations necessitate the employment of surrogate models in subsequent multi-objective design optimization. A detailed comparison between regression models and Kriging models suggests the importance of sampling schemes in successfully implementing Kriging methods.
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Reports on the topic "Design-based simulations"

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Tayibov, Khayyam. Tagging Birthplace for Optimal Tax Policy Redistribution, and Welfare. Department of Economics and Statistics, Linnaeus University, 2024. http://dx.doi.org/10.15626/ns.wp.2024.09.

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This paper studies the question of how place of birth affects the design of effective tax policies. Using Swedish population-wide register data, I investigate the relationship between regional origin and economic outcomes. Using a numerical simulation approach, I explore the implications of tagging individuals based on their place of birth for optimal tax policy and income redistribution. The numerical simulations show that under optimal tax policy, individuals from more populous regions are consistently assigned higher marginal and average tax rates, implying that the government redistributes from these regions to less populous ones. Moreover, I find that such policies can lead to significant welfare improvements.
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Stehno, Abigail, Jeffrey Melby, Shubhra Misra, Norberto Nadal-Caraballo, and Victor Gonzalez. Sabine Pass to Galveston Bay, TX Pre-construction, Engineering and Design (PED) : coastal storm surge and wave hazard assessment : report 4 – Freeport. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41903.

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The US Army Corps of Engineers, Galveston District, is executing the Sabine Pass to Galveston Bay Coastal Storm Risk Management (CSRM) project for Brazoria, Jefferson, and Orange Counties regions. The project is currently in the Pre-construction, Engineering, and Design phase. This report documents coastal storm water level (SWL) and wave hazards for the Freeport CSRM structures. Coastal SWL and wave loading and overtopping are quantified using high-fidelity hydrodynamic modeling and stochastic simulations. The CSTORM coupled water level and wave modeling system simulated 195 synthetic tropical storms on three relative sea level change scenarios for with- and without-project meshes. Annual exceedance probability (AEP) mean values were reported for the range of 0.2 to 0.001 for peak SWL and wave height (Hm0) along with associated confidence limits. Wave period and mean wave direction associated with Hm0 were also computed. A response-based stochastic simulation approach is applied to compute AEP values for overtopping for levees and overtopping, nappe geometry and combined hydrostatic and hydrodynamic fluid pressures for floodwalls. CSRM crest design elevations are defined based on overtopping rates corresponding to incipient damage. Survivability and resilience are evaluated. A system-wide hazard level assessment was conducted to establish final recommended system-wide elevations.
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Stehno, Abigail, Jeffrey Melby, Shubhra Misra, Norberto Nadal-Caraballo, and Victor Gonzalez. Sabine Pass to Galveston Bay, TX Pre-construction, Engineering and Design (PED) : coastal storm surge and wave hazard assessment : report 2 – Port Arthur. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41901.

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The US Army Corps of Engineers, Galveston District, is executing the Sabine Pass to Galveston Bay Coastal Storm Risk Management (CSRM) project for Brazoria, Jefferson, and Orange Counties regions. The project is currently in the Pre-construction, Engineering, and Design phase. This report documents coastal storm water level and wave hazards for the Port Arthur CSRM structures. Coastal storm water level (SWL) and wave loading and overtopping are quantified using high-fidelity hydrodynamic modeling and stochastic simulations. The CSTORM coupled water level and wave modeling system simulated 195 synthetic tropical storms on three relative sea level change scenarios for with- and without-project meshes. Annual exceedance probability (AEP) mean values were reported for the range of 0.2 to 0.001 for peak SWL and wave height (Hm0) along with associated confidence limits. Wave period and mean wave direction associated with Hm0 were also computed. A response-based stochastic simulation approach is applied to compute AEP values for overtopping for levees and overtopping, nappe geometry, and combined hydrostatic and hydrodynamic fluid pressures for floodwalls. CSRM crest design elevations are defined based on overtopping rates corresponding to incipient damage. Survivability and resilience are evaluated. A system-wide hazard level assessment was conducted to establish final recommended system-wide elevations.
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Stehno, Abigail, Jeffrey Melby, Shubhra Misra, Norberto Nadal-Caraballo, and Victor Gonzalez. Sabine Pass to Galveston Bay, TX Pre-construction, Engineering and Design (PED) : coastal storm surge and wave hazard assessment : report 3 – Orange County. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41902.

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The US Army Corps of Engineers, Galveston District, is executing the Sabine Pass to Galveston Bay Coastal Storm Risk Management (CSRM) project for Brazoria, Jefferson, and Orange Counties regions. The project is currently in the Pre-construction, Engineering, and Design phase. This report documents coastal storm water level (SWL) and wave hazards for the Orange County CSRM structures. Coastal SWL and wave loading and overtopping are quantified using high-fidelity hydrodynamic modeling and stochastic simulations. The CSTORM coupled water level and wave modeling system simulated 195 synthetic tropical storms on three relative sea level change scenarios for with- and without-project meshes. Annual exceedance probability (AEP) mean values were reported for the range of 0.2 to 0.001 for peak SWL and wave height (Hm0) along with associated confidence limits. Wave period and mean wave direction associated with Hm0 were also computed. A response-based stochastic simulation approach is applied to compute AEP values for overtopping for levees and overtopping, nappe geometry, and combined hydrostatic and hydrodynamic fluid pressures for floodwalls. CSRM crest design elevations are defined based on overtopping rates corresponding to incipient damage. Survivability and resilience are evaluated. A system-wide hazard level assessment was conducted to establish final recommended system-wide elevations.
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Melby, Jeffrey, Thomas Massey, Abigail Stehno, Norberto Nadal-Caraballo, Shubhra Misra, and Victor Gonzalez. Sabine Pass to Galveston Bay, TX Pre-construction, Engineering and Design (PED) : coastal storm surge and wave hazard assessment : report 1 – background and approach. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41820.

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The US Army Corps of Engineers, Galveston District, is executing the Sabine Pass to Galveston Bay Coastal Storm Risk Management (CSRM) project for Brazoria, Jefferson, and Orange Counties regions. The project is currently in the Pre-construction, Engineering, and Design phase. This report documents coastal storm water level and wave hazards for the Port Arthur CSRM structures. Coastal storm water level (SWL) and wave loading and overtopping are quantified using high-fidelity hydrodynamic modeling and stochastic simulations. The CSTORM coupled water level and wave modeling system simulated 195 synthetic tropical storms on three relative sea level change scenarios for with- and without-project meshes. Annual exceedance probability (AEP) mean values were reported for the range of 0.2 to 0.001 for peak SWL and wave height (Hm0) along with associated confidence limits. Wave period and mean wave direction associated with Hm0 were also computed. A response-based stochastic simulation approach is applied to compute AEP runup and overtopping for levees and overtopping, nappe geometry, and combined hydrostatic and hydrodynamic fluid pressures for floodwalls. CSRM structure crest design elevations are defined based on overtopping rates corresponding to incipient damage. Survivability and resilience are evaluated. A system-wide hazard level assessment was conducted to establish final recommended system-wide CSRM structure elevations.
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Fernandez, Ruben, Hernando Lugo, and Georfe Dulikravich. Aerodynamic Shape Multi-Objective Optimization for SAE Aero Design Competition Aircraft. Florida International University, 2021. http://dx.doi.org/10.25148/mmeurs.009778.

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The SAE Regular Class Aero Design Competition requires students to design a radio-controlled aircraft with limits to the aircraft power consumption, take-off distance, and wingspan, while maximizing the amount of payload it can carry. As a result, the aircraft should be designed subject to these simultaneous and contradicting objectives: 1) minimize the aerodynamic drag force, 2) minimize the aerodynamic pitching moment, and 3) maximize the aerodynamic lift force. In this study, we optimized the geometric design variables of a biplane configuration using 3D aerodynamic analysis using the ANSYS Fluent. Coefficients of lift, drag, and pitching moment were determined from the completed 3D CFD simulations. Extracted coefficients were used in modeFRONTIER multi-objective optimization software to find a set of non-dominated (Pareto-optimal or best trade-off) optimized 3D aircraft shapes from which the winner was selected based to the desired plane performance.
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Apostolatos, A., R. Rossi, and C. Soriano. D7.2 Finalization of "deterministic" verification and validation tests. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.006.

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This deliverable focus on the verification and validation of the solvers of Kratos Multiphysics which are used within ExaQUte. These solvers comprise standard body-fitted approaches and novel embedded approaches for the Computational Fluid Dynamics (CFD) simulations carried out within ExaQUte. Firstly, the standard body-fitted CFD solver is validated on a benchmark problem of high rise building - CAARC benchmark and subsequently the novel embedded CFD solver is verified against the solution of the body-fitted solver. Especially for the novel embedded approach, a workflow is presented on which the exact parameterized Computer-Aided Design (CAD) model is used in an efficient manner for the underlying CFD simulations. It includes: A note on the space-time methods Verification results for the body-fitted solver based on the CAARC benchmark Workflow consisting of importing an exact CAD model, tessellating it and performing embedded CFD on it Verification results for the embedded solver based on a high-rise building API definition and usage
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Yu, Y. S. Capabilities, limitations and the use of the GEOROC computer package. Natural Resources Canada/CMSS/Information Management, 1987. http://dx.doi.org/10.4095/325534.

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Computer codes have been used by various researchers in modelling viscoelastic formations, with a good degree of success. Serata used a complex rheological model, REM (Rheological Element Model) code, to simulate mine openings [2]. Others, in the U.S. Nuclear Waste Isolation Programme, have evaluated the capability of various codes for the design of nuclear waste repository [3]. Because of the proprietary nature of the above codes, they are not available to mine operators in Canada. Consequently, in 1984, CANMET initiated a research project to develop a numerical modelling package for use in the design of underground potash mine openings. GEOROC is the resultant computer program; it was developed by RE/SPEC Ltd., of Calgary under contract to CANMET. In recent years, computer simulation is playing an increasingly important role in evaluating the short and long term structural stability of underground mine openings, and in ground control studies related to mine design and layout. Such simulations are increasingly being used in the design of underground salt and potash mines. Because of the viscoelastic nature of salt rock formations, simulation models must take into consideration their time dependent properties if they are to correctly predict opening closures, ground stresses, and ground stability based on prescribed failure criteria. This presentation describes the capabilities, limitations and the use of computer code - GEOROC. A case history in which GEOROC is used to simulate a typical room and pillar mining section of a Western Canadian potash mine is provided. Predicted ground behaviour using the code is compared with actual behaviour as determined through field measurements. Results indicate that good correlation exits between predicted and measured ground behaviour, and is an encouragement to greater use of modelling in mine stability studies related to mine design.
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Wu, Yingjie, Selim Gunay, and Khalid Mosalam. Hybrid Simulations for the Seismic Evaluation of Resilient Highway Bridge Systems. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2020. http://dx.doi.org/10.55461/ytgv8834.

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Bridges often serve as key links in local and national transportation networks. Bridge closures can result in severe costs, not only in the form of repair or replacement, but also in the form of economic losses related to medium- and long-term interruption of businesses and disruption to surrounding communities. In addition, continuous functionality of bridges is very important after any seismic event for emergency response and recovery purposes. Considering the importance of these structures, the associated structural design philosophy is shifting from collapse prevention to maintaining functionality in the aftermath of moderate to strong earthquakes, referred to as “resiliency” in earthquake engineering research. Moreover, the associated construction philosophy is being modernized with the utilization of accelerated bridge construction (ABC) techniques, which strive to reduce the impact of construction on traffic, society, economy and on-site safety. This report presents two bridge systems that target the aforementioned issues. A study that combined numerical and experimental research was undertaken to characterize the seismic performance of these bridge systems. The first part of the study focuses on the structural system-level response of highway bridges that incorporate a class of innovative connecting devices called the “V-connector,”, which can be used to connect two components in a structural system, e.g., the column and the bridge deck, or the column and its foundation. This device, designed by ACII, Inc., results in an isolation surface at the connection plane via a connector rod placed in a V-shaped tube that is embedded into the concrete. Energy dissipation is provided by friction between a special washer located around the V-shaped tube and a top plate. Because of the period elongation due to the isolation layer and the limited amount of force transferred by the relatively flexible connector rod, bridge columns are protected from experiencing damage, thus leading to improved seismic behavior. The V-connector system also facilitates the ABC by allowing on-site assembly of prefabricated structural parts including those of the V-connector. A single-column, two-span highway bridge located in Northern California was used for the proof-of-concept of the proposed V-connector protective system. The V-connector was designed to result in an elastic bridge response based on nonlinear dynamic analyses of the bridge model with the V-connector. Accordingly, a one-third scale V-connector was fabricated based on a set of selected design parameters. A quasi-static cyclic test was first conducted to characterize the force-displacement relationship of the V-connector, followed by a hybrid simulation (HS) test in the longitudinal direction of the bridge to verify the intended linear elastic response of the bridge system. In the HS test, all bridge components were analytically modeled except for the V-connector, which was simulated as the experimental substructure in a specially designed and constructed test setup. Linear elastic bridge response was confirmed according to the HS results. The response of the bridge with the V-connector was compared against that of the as-built bridge without the V-connector, which experienced significant column damage. These results justified the effectiveness of this innovative device. The second part of the study presents the HS test conducted on a one-third scale two-column bridge bent with self-centering columns (broadly defined as “resilient columns” in this study) to reduce (or ultimately eliminate) any residual drifts. The comparison of the HS test with a previously conducted shaking table test on an identical bridge bent is one of the highlights of this study. The concept of resiliency was incorporated in the design of the bridge bent columns characterized by a well-balanced combination of self-centering, rocking, and energy-dissipating mechanisms. This combination is expected to lead to minimum damage and low levels of residual drifts. The ABC is achieved by utilizing precast columns and end members (cap beam and foundation) through an innovative socket connection. In order to conduct the HS test, a new hybrid simulation system (HSS) was developed, utilizing commonly available software and hardware components in most structural laboratories including: a computational platform using Matlab/Simulink [MathWorks 2015], an interface hardware/software platform dSPACE [2017], and MTS controllers and data acquisition (DAQ) system for the utilized actuators and sensors. Proper operation of the HSS was verified using a trial run without the test specimen before the actual HS test. In the conducted HS test, the two-column bridge bent was simulated as the experimental substructure while modeling the horizontal and vertical inertia masses and corresponding mass proportional damping in the computer. The same ground motions from the shaking table test, consisting of one horizontal component and the vertical component, were applied as input excitations to the equations of motion in the HS. Good matching was obtained between the shaking table and the HS test results, demonstrating the appropriateness of the defined governing equations of motion and the employed damping model, in addition to the reliability of the developed HSS with minimum simulation errors. The small residual drifts and the minimum level of structural damage at large peak drift levels demonstrated the superior seismic response of the innovative design of the bridge bent with self-centering columns. The reliability of the developed HS approach motivated performing a follow-up HS study focusing on the transverse direction of the bridge, where the entire two-span bridge deck and its abutments represented the computational substructure, while the two-column bridge bent was the physical substructure. This investigation was effective in shedding light on the system-level performance of the entire bridge system that incorporated innovative bridge bent design beyond what can be achieved via shaking table tests, which are usually limited by large-scale bridge system testing capacities.
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10

Arduino, Pedro, Long Chen, and Christopher McGann. Estimation of Shear Demands on Rock Socketed Drilled Shafts subjected to Lateral Loading. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2018. http://dx.doi.org/10.55461/nsos1322.

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Abstract:
This report presents results of an evaluation study on the applicability of current design procedures (based on p-y curves) to the analysis of large-diameter shafts socketed in rock, and the identification of enhanced moment transfer mechanisms not considered in current design methodologies. For this purpose simplified models, and possible three-dimensional (3D) finite-element method (FEM) models are studied to shed some light on the response of drilled shafts socketed in rock. A parametric study using p-y and considering a wide range of rock properties and rock-socket depths, different criteria to define the soil and rock p-y curves, different beam theories, and different interface frictional resistances are presented and compared with 3D FEM simulations. A new element is discussed to account for the shaft toe and underlain rock interaction, which could provide benefit to reduce shear demands when the socket is shallow.
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