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Добірка наукової літератури з теми "Dynamic modeling and simulations"

Автор: Grafiati
Опубліковано: 4 червня 2021
Оновлено: 6 лютого 2022

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Статті в журналах з теми "Dynamic modeling and simulations"

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HUANG, HAI, YONG-JIE PANG, JIANG LI, SHAO-WEI FAN, XIN-QING WANG, and HONG LIU. "UNDERACTUATED HAND DYNAMIC MODELING, ITS REAL-TIME SIMULATION, AND CONTROL." International Journal of Humanoid Robotics 07, no. 04 (2010): 609–34. http://dx.doi.org/10.1142/s021984361000226x.

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Анотація:
The forward and inverse dynamic models of the underactuated 2-DOF finger have been established in this article based on virtual spring approach. This approach not only avoids the solution of differential-algebraic equations but also leads to a completely decoupled dynamic model that is ideal for directly inverse dynamic analysis, real-time dynamic simulation and control. To verify this approach, an underactuated 3-joint finger has been brought forward. Simulation results from Matlab/Simulink are consistent with those obtained from ADAMS grasp simulations. For the hand real-time dynamic control, the velocity observer has been established based on the dynamic model, the adaptive curve fitting with the observer has obtained precise velocity signals, made up the uncertain parameters such as torsion spring, inertial, damps, etc. and achieved ideal results. By applying dynamics model and observer, the force-based impedance control can realize more accurate and stable force control during grasp.
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2

Kao, B. G. "A Three-Dimensional Dynamic Tire Model for Vehicle Dynamic Simulations." Tire Science and Technology 28, no. 2 (2000): 72–95. http://dx.doi.org/10.2346/1.2135995.

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Анотація:
Abstract Traditional multibody dynamic (MBD) tire models concentrate on the tire patch force development and the tire in-plane characteristics. The tire lateral dynamics and nonlinear effects caused by the tire compliances during rough terrain driving and severe maneuvers are mostly neglected in vehicle analytical simulations. The tire finite element models, though capable of dealing with these phenomena, are basically not designed for quick vehicle dynamic evaluations. A simple three-dimensional (3-D) MBD tire model for full vehicle performance and maneuvering simulations over various road surfaces is therefore desirable for the ever expanding analysis capabilities and the improved accuracy of the computer-aided vehicle design analysis. In this paper a tire modeling concept to extend the in-plane dynamic tire model to full 3-D tire dynamics is proposed. Essentially, this tire model divides the traditional tire/wheel system model into three elements: two rigid bodies representing the wheel mass/inertia and the tire tread mass/inertia, and a spring/damper representing the sidewall visco-elasticity. Thus, 6 degrees-of-freedom (DOFs) are added for each tire over traditional tire models. Using any existing tire patch force calculation model, this proposed model can be used to simulate full 3-D dynamic responses of a vehicle. To implement this model, techniques to extract the nonlinear spring rates of the sidewalls and to enhance the tire patch force calculations over uneven terrains are explained in this paper. Results of the vehicle simulation using this tire model were compared with measured field data. They showed that this tire modeling concept yields a practical representation for tire 3-D nonlinear dynamic characteristics.
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3

Dinkelbach, Jan, Ghassen Nakti, Markus Mirz, and Antonello Monti. "Simulation of Low Inertia Power Systems Based on Shifted Frequency Analysis." Energies 14, no. 7 (2021): 1860. http://dx.doi.org/10.3390/en14071860.

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Анотація:
New types of power system transients with lower time constants are emerging due to the replacement of synchronous generation with converter interfaced generation and are challenging the modeling approaches conventionally applied in power system simulation. Quasi-stationary simulations are based on classical phasor models, whereas EMT simulations calculate the instantaneous values of models in the time domain. In addition to these conventional modeling approaches, this paper investigates simulation based on dynamic phasor models, as has been proposed by the Shifted Frequency Analysis. The simulation accuracy of the three modeling approaches was analyzed for characteristic transients from the electromagnetic to the electromechanical phenomena range, including converter control as well as low inertia transients. The analysis was carried out for systems with converter interfaced and synchronous generation whilst considering the simulation step size as a crucial influence parameter. The results show that simulations based on dynamic phasors allow for larger step sizes than simulations that calculate the instantaneous values in the time domain. This can facilitate the simulation of more complex component models and larger grid sizes. In addition, with dynamic phasors, more accurate simulation results were obtained than with classical phasors, in particular—but not exclusively—in a low inertia case. Overall, the presented work demonstrates that dynamic phasors can enable fast and accurate simulations during the transition to low inertia power systems.
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4

Shah, Yash, Andrea Vacca, and Sadegh Dabiri. "Air Release and Cavitation Modeling with a Lumped Parameter Approach Based on the Rayleigh–Plesset Equation: The Case of an External Gear Pump." Energies 11, no. 12 (2018): 3472. http://dx.doi.org/10.3390/en11123472.

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Анотація:
In this paper, a novel approach for the simulation of cavitation and aeration in hydraulic systems using the lumped parameter method is presented. The presented approach called the Hybrid Rayleigh–Plesset Equation model is derived from the Rayleigh–Plesset Equation representative of bubble dynamics and overcomes several shortcomings present in existing lumped parameter based cavitation modeling approaches. Models based on static approximations do not consider the non-equilibrium effects of phase change on the system and incorrectly predict the system dynamics. On the other hand, the existing dynamic cavitation modeling strategies account for the non-equilibrium effects of phase change but express the evolution of phases through approximations of the Rayleigh–Plesset Equation (such as exclusion of nonlinear interactions in bubble dynamics), which often lead to physically unrealistic time-scales of bubble growth or dissolution. This paper presents a dynamic model for cavitation which is capable of predicting cavitation in hydraulic systems while preserving the nonlinear dynamics arising from the Rayleigh–Plesset Equation. The derived model determines the evolution of phases in terms of physically realizable parameters such as the bubble radius and the nuclei density, which can be estimated or determined experimentally. The paper demonstrates the effectiveness of the derived modeling approach with the help of numerical simulations of an External Gear Machine. Results from the simulations employing the proposed model are compared with an existing dynamic cavitation modeling approach and validated with experimental results over a range of dynamic parameters.
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5

Mueller, Eric, William Mell, and Albert Simeoni. "Large eddy simulation of forest canopy flow for wildland fire modeling." Canadian Journal of Forest Research 44, no. 12 (2014): 1534–44. http://dx.doi.org/10.1139/cjfr-2014-0184.

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Анотація:
Large eddy simulation (LES) based computational fluid dynamics (CFD) simulators have obtained increasing attention in the wildland fire research community, as these tools allow the inclusion of important driving physics. However, due to the complexity of the models, individual aspects must be isolated and tested rigorously to ensure meaningful results. As wind is a driving force that can significantly dictate the behavior of a wildfire, the simulation of wind is studied in the context of a particular LES CFD model, the Wildland–urban interface Fire Dynamics Simulator (WFDS). As WFDS has yet to be tested extensively with regard to wind flow within and above forest canopies, a study of its ability to do so is carried out. First, three simulations are conducted using periodic boundary conditions. Two of these assume a spatially heterogeneous forest and one models wind downstream of a canopy edge. Second, two simulations are conducted with specified “inflow” conditions using two inflow profiles: one static and one dynamic (driven by a precursor simulation). Using periodic boundary conditions, the model is found to generate profiles of mean velocity and turbulent statistics that are representative of experimental measurements. The dynamic inflow scenario is found to perform better than the static case.
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Wang, Peng, Xinliang Tian, Wenyue Lu, Zhihuan Hu, and Yong Luo. "Dynamic modeling and simulations of the wave glider." Applied Mathematical Modelling 66 (February 2019): 77–96. http://dx.doi.org/10.1016/j.apm.2018.08.027.

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Chen, Qiu Yue, and Li Zeng. "Dynamic Modeling and Simulation of the Basic Shaft Bearingless Motors." Applied Mechanics and Materials 275-277 (January 2013): 2451–54. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.2451.

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Анотація:
A dynamic coupling model of the bearingless motor is established. This test does some simulations of motor displacement, no load speed and tracking accuracy under certain performance indicators. Analysis and simulation results show that the system has a control strategy of high precision as well as good dynamic and static performance.
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Qi, Lin, Yong Qiang Zhu, Zhi Yu Wang, and Chun Peng Fu. "Modeling for Lithium Iron Phosphate Battery and its Simulation in PSCAD." Applied Mechanics and Materials 331 (July 2013): 250–53. http://dx.doi.org/10.4028/www.scientific.net/amm.331.250.

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Анотація:
This paper proposes an improved dynamic model of lithium iron phosphate battery, and shows the simulation results. The method takes into account the nonlinear characteristics of the battery charging and discharging, and changes the variation of battery resistance into that of voltage, which makes the simulation circuit simpler and easier to be implemented. Simulations examine the time-changing characteristics of the state of charge (SOC), depth of discharge and the current/voltage in the charge/discharge processes, as well as the relationship between voltage and SOC. The model has correctively shown the dynamic characteristics of lithium iron phosphate battery in our simulations.
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9

Yang, Jing, Lingtao Yu, Lan Wang, Zhengyu Wang, and Wenjie Wang. "Dynamic modeling and analysis of the instrument arm based on the physical properties of soft tissues." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 12 (2017): 2185–99. http://dx.doi.org/10.1177/0954406217715661.

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Анотація:
Surgical robot is a hotspot problem of the current research. This paper presents the dynamical analysis of an instrument arm for minimally invasive surgical robot. Firstly, the study presents a general dynamics modeling method, by which a dynamical model of the instrument arm is established and verified by simulation, then a general force of the trocar point is considered and related analysis is performed. Considering the diversity of the reaction force, one-dimensional force is added separately at the operating point and some simulations are performed based on the dynamic model. Secondly, mechanical characterization of soft tissues is researched based on the indentation experiments, where the constitutive models for compression and relaxation are derived and added to the dynamical model to establish a complete dynamic model with the property of soft tissues. Lastly, the trocar force is analyzed in detail where the instrument arm is found to be sensitive to the tiny force based on the simulation results, and then a force sensing strategy of contact force on soft tissues is presented. Comprehensively, dynamical analysis for the instrument arm will provide an important basis for its control.
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Blanchette, Carl, Maxime Boisvert, Nicolas Joubert, Denis Rancourt, and Alain Desrochers. "Dynamic input loads evaluation of a recreational vehicle frame using multibody dynamics hybrid modeling validated with experimental and full analytical modeling data." Advances in Mechanical Engineering 13, no. 8 (2021): 168781402110346. http://dx.doi.org/10.1177/16878140211034608.

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Анотація:
Knowledge of frame loads at the limits of the intended driving conditions is important during the design process of a vehicle structure. Yet, retrieving these loads is not trivial as the load path between the road and the frame mounting point is complex. Fortunately, recent studies have shown that multibody dynamic (MBD) simulations could be a powerful tool to estimate these loads. Two main categories of MBD simulations exist. Firstly, full analytical simulations, which have received great attention in the literature, are run in a virtual environment using a tire model and a virtual road. Secondly, hybrid simulations, also named semi analytical, uses experimental data from Wheel Force Transducers and Inertial Measurement Units to replace the road and tire models. It is still unclear how trustworthy semi analytical simulations are for frame load evaluation. Both methods were tested for three loads cases. It was found that semi analytical simulations were slightly better in predicting vehicle dynamic and frame loads than the full analytical simulations for frequencies under the MF-Tyre model valid frequency range (8 Hz) with accuracy levels over 90%. For faster dynamic maneuvers, the prediction accuracy was lower, in the 50%–80% range, with semi analytical simulations showing better results.
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Більше джерел

Дисертації з теми "Dynamic modeling and simulations"

1

Colella, Vanessa Stevens. "Participatory simulations : building collaborative understanding through immersive dynamic modeling." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/61099.

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2

VISCONTI, IGOR FERREIRA. "MEASUREMENT-BASED LOAD MODELING FOR DYNAMIC SIMULATIONS ON ELECTRIC POWER SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=16417@1.

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Анотація:
CENTRO DE PESQUISA DE ENERGIA ELÉTRICA<br>Este trabalho descreve uma metodologia para modelagem de cargas elétricas, utilizando dados de tensão e corrente registrados durante distúrbios no sistema de potência. Estes modelos são utilizados na representação de subsistemas da rede elétrica em simulações computacionais que preveem o comportamento dinâmico do sistema de potência após perturbações em suas condições normais de operação.São apresentados resultados práticos da metodologia proposta, onde a carga é definida como um sistema cuja saída é a variação da potência consumida e a entrada é a variação da tensão, ambas medidas em barramentos de 69 kV da Companhia Hidroelétrica do São Francisco (CHESF), ponto de entrega de energia para concessionárias distribuidoras de energia do nordeste brasileiro. Estas distribuidoras são modeladas como cargas, supridas pelo sistema de transmissão da CHESF e todos os elementos consumidores de energia são agregados nestes modelos equivalentes, parametrizados para simular o maior número de contingências típicas medidas em cada um destes barramentos de carga.A técnica de estimação de parâmetros dos modelos de cargas é o Algoritmo Genético (AG) cujos resultados apresentaram precisão para a simulação de contingências de características bem distintas, caracterizando a abrangência alcançada no processo de identificação de sistemas.Ao final do trabalho são apresentadas curvas de desvios de potência ativa e reativa causadas por afundamentos de tensão, ambos registrados nos barramentos das subestações da CHESF. Estas curvas foram utilizadas para estimar os parâmetros dos modelos, obtidos individualmente para cada uma das subestações estudadas.<br>This work describes a measurement-based load modeling methodology, using voltage and current data registered during power system disturbances. These load models are used on computational simulations for predicting power system stability after disturbances of system operational points. Practical results are presented of the proposed methodology, defining load as a system whose output is power deviation from its operational state and input is voltage sags, both measured at 69 kV bus bars of São Francisco Hydroelectric Company (CHESF), points of common coupling (PCC) between CHESF and local distribution utilities. Therefore, distribution utilities are seen as loads supplied by CHESF’s transmission system. All devices consuming power from the PCC are aggregated into an equivalent model, parameterized to simulate most typical contingencies measured by these 69kV load bars. Optimization technique used for load model parameter estimation is Genetic Algorithm (GA), showing his flexibility on implementation and good coverage and accuracy in the final results. At the end, it will be presented a set of active and reactive power curves during and after voltages sags, measured on CHESF’s substations. These curves were used as estimation data to parameterize load models for each substation chosen.
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3

Li, Tianyi. "Gradient-damage modeling of dynamic brittle fracture : variational principles and numerical simulations." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX042/document.

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Анотація:
Une bonne tenue mécanique des structures du génie civil en béton armé sous chargements dynamiques sévères est primordiale pour la sécurité et nécessite une évaluation précise de leur comportement en présence de propagation dynamique de fissures. Dans ce travail, on se focalise sur la modélisation constitutive du béton assimilé à un matériau élastique-fragile endommageable. La localisation des déformations sera régie par un modèle d'endommagement à gradient où un champ scalaire réalise une description régularisée des phénomènes de rupture dynamique. La contribution de cette étude est à la fois théorique et numérique. On propose une formulation variationnelle des modèles d'endommagement à gradient en dynamique. Une définition rigoureuse de plusieurs taux de restitution d'énergie dans le modèle d'endommagement est donnée et on démontre que la propagation dynamique de fissures est régie par un critère de Griffith généralisé. On décrit ensuite une implémentation numérique efficace basée sur une discrétisation par éléments finis standards en espace et la méthode de Newmark en temps dans un cadre de calcul parallèle. Les résultats de simulation de plusieurs problèmes modèles sont discutés d'un point de vue numérique et physique. Les lois constitutives d'endommagement et les formulations d'asymétrie en traction et compression sont comparées par rapport à leur aptitude à modéliser la rupture fragile. Les propriétés spécifiques du modèle d'endommagement à gradient en dynamique sont analysées pour différentes phases de l'évolution de fissures : nucléation, initiation, propagation, arrêt, branchement et bifurcation. Des comparaisons avec les résultats expérimentaux sont aussi réalisées afin de valider le modèle et proposer des axes d'amélioration<br>In civil engineering, mechanical integrity of the reinforced concrete structures under severe transient dynamic loading conditions is of paramount importance for safety and calls for an accurate assessment of structural behaviors in presence of dynamic crack propagation. In this work, we focus on the constitutive modeling of concrete regarded as an elastic-damage brittle material. The strain localization evolution is governed by a gradient-damage approach where a scalar field achieves a smeared description of dynamic fracture phenomena. The contribution of the present work is both theoretical and numerical. We propose a variationally consistent formulation of dynamic gradient damage models. A formal definition of several energy release rate concepts in the gradient damage model is given and we show that the dynamic crack tip equation of motion is governed by a generalized Griffith criterion. We then give an efficient numerical implementation of the model based on a standard finite-element spatial discretization and the Newmark time-stepping methods in a parallel computing framework. Simulation results of several problems are discussed both from a computational and physical point of view. Different damage constitutive laws and tension-compression asymmetry formulations are compared with respect to their aptitude to approximate brittle fracture. Specific properties of the dynamic gradient damage model are investigated for different phases of the crack evolution: nucleation, initiation, propagation, arrest, kinking and branching. Comparisons with experimental results are also performed in order to validate the model and indicate its further improvement
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4

Akkinapragada, Nagasmitha. "Dynamic modeling and simulations of solid oxide fuel cells for grid-tied applications." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.umr.edu/thesis/pdf/final_copy1_09007dcc8031997c.pdf.

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Анотація:
Thesis (M.S.)--University of Missouri--Rolla, 2007.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 17, 2007) Includes bibliographical references (p. 77-80).
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5

Endale, Turie Samson. "Gas Turbine Plant Modeling for Dynamic Simulation." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93897.

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Анотація:
Gas turbines have become effective in industrial applications for electric and thermal energy production partly due to their quick response to load variations. A gas turbine power plant is a complex assembly of a varietyof components that are designed on the basis of aero thermodynamiclaws. This thesis work presents model development of a single-shaft gas turbine plant cycle that can operate at wide range of load settings in complete dynamic GTP simulator. The modeling and simulation has been done in Dymola 7.3, based on the Modelica programming language. The gas turbine plant model is developed on component-oriented basis. This means that the model is built up by smaller model classes. With this modeling approach, the models become flexible and user-friendly for different plant operational modes. The component models of the main steady-state compressor and turbine stages have been integrated with gas plenum models for capturing the performance dynamics of the gas turbine power plant. The method of assembly used for gas turbine plant integration is based on models of the components from an engineering process scheme. In order to obtain an accurate description of the gas-turbine working principle, each component is described by a non-linear set of both algebraic and first-order differential equations. The thesis project provides descriptions of the mathematical equations used for component modeling and simulation. A complete dynamic simulation of a gas-turbine plant has been performed by connecting the complete plant model with PI controllers for both design and off-design operating modes. Furthermore, turbine blade cooling has been studied to evaluate the changes in power output. This has been done to compare and analyze the blade cooling effect.
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6

Engström, Jesper, Elias Richloow, and Anders Wickström. "Modeling of Robotic Hand for Dynamic Simulation." Thesis, KTH, Maskinkonstruktion (Inst.), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171991.

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Анотація:
KTHand is a robot hand designed within a doctoral thesis by Johan Tegin. KTHand is meant to be a simple construction, able to be produced for a low cost but still be functional thanks to feedback from tactile and position sensors. The mechanical construction of KTHand is based on three identical fingers, corresponding index finger, middle finger, and a thumb. Each finger consists of three movable links, called phalanges, connected by a leaf spring on the top. For the force actuation, a fishing line acting as a tendon is running through ducts in the phalanges. Each tendon is powered by a direct current motor in the hand, and this gives a finger three degrees of freedom (D.O.F.) with only one actuator, i.e. an under-actuated finger. To evaluate KTHand – simulations in the open-source software GraspIt! have been carried out. These simulations have been more or less successful, and a wish for simulation in another program has arisen. MSC ADAMS is a widely used and verified commercial program which is used for setting up advanced physical multibody simulations. ADAMS is fairly untested for the purpose of simulating robot hands and that is why it is of interest to see whether it is possible to successfully simulate the grasp dynamics of a robot hand, which is the topic for this thesis.As a starting point for the model design in ADAMS, a previously developed CAD model has been used since ADAMS provides the ability to import CAD files. To decrease the level of complexity, a number of simplifications have been done to the CAD model – unnecessary geometry such as screws and screw holes have been removed and curved lines in the geometry of the hand have been replaced by straight lines.After the simplified model was imported in ADAMS – joints, springs and contact conditions have been defined to obtain ranges of motion (R.O.M.) analogous to those of the physical prototype. To imitate the tendon which actuates a finger, a number of point forces have been defined. These point forces represent the reactive forces acting on the phalanges from the tendon. To perform a grasp simulation a number of different setups were used, each one with a different geometrical object to be grasped. Contact conditions between the hand and the objects were defined and the simulations were evaluated. The model can be used to simulate contact forces and how the hand interacts with different geometries. The conclusion of the simulations is that grasps based on shape give satisfying results while grasps based on friction force are of less accuracy. Friction conditions in ADAMS have turned out to be of low precision, and thus the grips based on friction become unrealistic.<br>KTHand är en robothand utformad inom en doktorsavhandling av Johan Tegin. KTHand är tänkt att vara en enkel konstruktion som ska kunna tillverkas för en låg kostnad samtidigt som den ska vara funktionell tack vare återkoppling av taktila givare och positionsgivare. KTHands mekaniska konstruktion är baserad på tre identiska fingrar, motsvarande pekfinger, långfinger och tumme. Varje finger är uppbyggt av tre rörliga länkar sammanfogade av en bladfjäder på ovansidan. Kraftstyrningen i ett finger utgörs av en fiskelina som löper genom hela fingret och får sin kraft av en likströmsmotor i handen. Detta ger ett finger med tre frihetsgrader aktuerat av en motor, alltså ett underaktuerat finger. För att utvärdera KTHand har simuleringar utförts i programmet GraspIt!. Dessa simuleringar har givit blandade resultat varför en önskan om simulering i annat program har uppkommit. MSC ADAMS är ett utbrett och välverifierat kommersiellt program som möjliggör avancerade fysikaliska flerkroppssimuleringar. ADAMS är dock ett tämligen oprövat program för just robothandssimulering och därför är det av intresse att utreda huruvida en robothands greppdynamik framgångsrikt kan simuleras i ADAMS och detta är ämnet som behandlas i den här rapporten. Sedan tidigare finns en utförlig CAD-modell av KTHand och denna har använts som utgångspunkt för modelluppbyggandet i ADAMS eftersom CAD-modeller kan importeras i detta program. För att bland annat minska komplexitetsnivån har den existerande CAD-modellen kraftigt förenklats på så vis att all, för ADAMS-modellen, onödig geometri som t.ex. skruvar och skruvhål har tagits bort. Vidare har även geometrin förenklats genom att kurviga kantlinjer har ersatts av raka dito. I ADAMS har leder och fjädrar definierats, rörelsetvång har införts genom att upprätta kontaktvillkor och kraftstyrning har lösts genom att införa krafter representerande de reaktionskrafter som uppkommer inne i fingrarna från den genomlöpande ”senan”. För att sedan simulera grepp har geometriska objekt skapats i ADAMS varefter kontaktvillkor definierats. Modellen kan användas för att simulera kontaktkrafter och hur handen interagerar med föremål av olika geometri. Slutsatsen av dessa simuleringar är att formbaserade grepp ger mer tillförlitliga resultat än friktionsbaserade grepp. Friktionsvilkoren i ADAMS har visat sig vara mindre tillförlitliga och på så sätt är de grepp som är starkt beroende av friktion ej verklighetstrogna.
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7

Cooke, Joseph M. "NPSNET : flight simulation dynamic modeling using quaternions." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/27165.

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Анотація:
The Naval Postgraduate School (NPS) has actively explored the design and implementation of networked, realtime, three-dimensional battlefield simulations on low cost, commercially available graphics workstations. The most recent system, NPSNET, has improved in functionality to such an extent, that it is considered a low cost version of the Defense Advanced Research Project Agency's (DARPA) SIMNET system. In order to reach that level, it was necessary to economize in certain areas of the code so that real time performance occurred at an acceptable level. One of those areas was in aircraft dynamics. However, with 'off-the-shelf' computers becoming faster and cheaper, real-time and realistic dynamics are no longer an expensive option. The realistic behavior can now be enhanced through the incorporation of an aerodynamic model. To accomplish this task, a prototype flight simulator was built that is capable of simulating numerous types of aircraft simultaneously within a virtual world. Beside being easily incorporated into NPSNET, such a simulator will also provide the base functionality for the creation of a general purpose aerodynamic simulator that is particularly useful to aerodynamic students for graphically analyzing differing aircraft's stability and control characteristics. This system is designed for use on a Silicon Graphics workstation and uses the GL libraries. Computer Graphics, Animation, Simulation, Aerodynamics, Quaternions
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8

Harrell, Anthony F. "Molecular dynamic modeling and simulation for polymers." Thesis, Monterey, California. Naval Postgraduate School, 2012.

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Approved for public release; distribution in unlimited.<br>Polymers have been widely used in various engineering applications. For more than a quarter century, the materials have been utilized intensively for the binding materials for composites. The material properties of the binding materials called matrix materials play an important role for the composite material behaviors. As a result, the objective of this study was to understand the mechanical properties of polymers. In particular, the goal was to develop insights as to how a molecular level structure is connected to the bulk properties of materials assuming homogeneity. To this end, molecular dynamics was used to model and simulate the polymeric behaviors. Polymeric chains were modeled using the bead and spring model along with interacting potentials. The study examined the effects of different sizes, densities, and numbers of molecules per chain on the shear moduli of the polymers. Furthermore, some preliminary study was also conducted for metallic particle reinforced polymer composites.
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9

Harrell, Anthony F. "Molecular dynamic modeling and simulation for polymers /." [United States] : Storming Media, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FHarrell.pdf.

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10

Nordbeck, Patric C. "Dynamics of Affordance Actualization." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504881864634251.

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Книги з теми "Dynamic modeling and simulations"

1

Hannon, Bruce M. Dynamic modeling. Springer-Verlag, 1994.

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2

Matthias, Ruth, ed. Dynamic modeling. Springer-Verlag, 1994.

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3

Matthias, Ruth, ed. Dynamic Modeling. Springer New York, 2001.

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4

Georgiadis, Michael C. Dynamic process modeling. Wiley-VCH, 2011.

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5

Georgiadis, Michael C., Julio R. Banga, and Efstratios N. Pistikopoulos. Dynamic process modeling. Wiley-VCH, 2011.

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6

Torkel, Glad, ed. Modeling of dynamic systems. PTR Prentice Hall, 1994.

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7

M, Hannon Bruce, ed. Modeling dynamic economic systems. Springer, 1997.

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8

Matthias, Ruth, ed. Modeling dynamic biological systems. Springer, 1997.

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9

Woods, Robert L. Modeling and simulation of dynamic systems. Prentice Hall, 1997.

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10

J, Winebrake James, ed. Dynamic modeling of environmental systems. Springer, 2000.

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Частини книг з теми "Dynamic modeling and simulations"

1

Jacqmin, Philippe, and Eric Snoeck. "Viral Dynamic Modeling and Simulations in HIV and Hepatitis C." In Clinical Trial Simulations. Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7415-0_11.

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2

Ghosh, Asish. "Modeling and Simulation." In Dynamic Systems for Everyone. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43943-3_5.

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3

Ghosh, Asish. "Modeling and Simulation." In Dynamic Systems for Everyone. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10735-6_5.

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4

Cristiani, Emiliano, Benedetto Piccoli, and Andrea Tosin. "Problems and Simulations." In Multiscale Modeling of Pedestrian Dynamics. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06620-2_2.

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5

Chocron, Sidney, and Charles E. Anderson. "Numerical Simulations of the Penetration of Glass Using Two Pressure-Dependent Constitutive Models." In Predictive Modeling of Dynamic Processes. Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0727-1_10.

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6

Basu, Dipak, and Victoria Miroshnik. "National Economic Management with Stochastic Optimal Control: Simulations over History." In Dynamic Systems Modeling and Optimal Control. Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137508959_6.

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7

Sills, Ryan B., William P. Kuykendall, Amin Aghaei, and Wei Cai. "Fundamentals of Dislocation Dynamics Simulations." In Multiscale Materials Modeling for Nanomechanics. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-33480-6_2.

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8

LeSar, Richard, and Laurent Capolungo. "Advances in Discrete Dislocation Dynamics Simulations." In Handbook of Materials Modeling. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-42913-7_85-1.

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9

LeSar, Richard, and Laurent Capolungo. "Advances in Discrete Dislocation Dynamics Simulations." In Handbook of Materials Modeling. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-44677-6_85.

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10

Henze, Richard, Gerd Grünert, Bashar Ibrahim, and Peter Dittrich. "Spatial Rule-Based Simulations: The SRSim Software." In Modeling Biomolecular Site Dynamics. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9102-0_10.

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Тези доповідей конференцій з теми "Dynamic modeling and simulations"

1

Marchiori, Gianpietro, Francesco Rampini, Simone De Lorenzi, Enrico Marcuzzi, Enrico Bragante, and Riccardo Bressan. "ELT telescope: control system dynamic simulations." In Modeling, Systems Engineering, and Project Management for Astronomy VIII, edited by George Z. Angeli and Philippe Dierickx. SPIE, 2018. http://dx.doi.org/10.1117/12.2314946.

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2

Dahl, P., and J. Ly. "Dynamic hysteresis modeling." In Modeling and Simulation Technologies Conference. American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-4094.

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3

Nimpitiwan, Natthaphob. "Inverter-based photovoltaic distributed generations: Modeling and dynamic simulations." In 2010 IEEE Region 10 Conference (TENCON 2010). IEEE, 2010. http://dx.doi.org/10.1109/tencon.2010.5685907.

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4

Qiu, Fasheng, and Xiaolin Hu. "Modeling Dynamic Groups for Agent-Based Pedestrian Crowd Simulations." In 2010 IEEE/ACM International Conference on Web Intelligence-Intelligent Agent Technology (WI-IAT). IEEE, 2010. http://dx.doi.org/10.1109/wi-iat.2010.9.

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5

David, S. A., J. M. Balthazar, B. H. S. Julio, and C. Oliveira. "The fractional-nonlinear robotic manipulator: Modeling and dynamic simulations." In 9TH INTERNATIONAL CONFERENCE ON MATHEMATICAL PROBLEMS IN ENGINEERING, AEROSPACE AND SCIENCES: ICNPAA 2012. AIP, 2012. http://dx.doi.org/10.1063/1.4765504.

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6

Nae, Cătălin, Gabriela-Liliana Stroe, Irina Carmen Andrei, and Sorin Berbente. "Dynamic systems modeling and numerical simulations for optimal control." In CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114363.

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7

Kim, A. Ram, Prasanth Vivekanandan, Patrick McNamee, Ian Sheppard, Aaron Blevins, and Alex Sizemore. "Dynamic Modeling and Simulation of A Quadcopter with Motor Dynamics." In AIAA Modeling and Simulation Technologies Conference. American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-1560.

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8

Andersson, Daniel, Erik A˚berg, Jinliang Yuan, Bengt Sunde´n, and Jonas Eborn. "Dynamic Modeling of a Solid Oxide Fuel Cell System in Modelica." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33053.

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In this study a dynamic model of a solid oxide fuel cell (SOFC) system has been developed. The work has been conducted in a cooperation between the Department of Energy Sciences, Lund University, and Modelon AB using the Modelica language and the Dymola modeling and simulation tool. Modelica is an equation based, object oriented modeling language, which promotes flexibility and reuse of code. The objective of the study is to investigate the suitability of the Modelica language for dynamic fuel cell system modeling. A cell electrolyte model including ohmic, activation and concentration irreversibilities is implemented and verified against simulations and experimental data presented in the open literature. A 1D solid oxide fuel cell model is created by integrating the electrolyte model and a 1D fuel flow model, which includes dynamic internal steam reforming of methane and water-gas shift reactions. Several cells are then placed with parallel flow paths and connected thermally and electrically in series. By introducing a manifold pressure drop, a stack model is created. The stack model is applied in a complete system including an autothermal reformer, a catalytic after-burner, a steam generator and heat exchangers. Four reactions are modeled in the autothermal reformer; two types of methane steam reforming, the water-gas shift reaction and total combustion of methane. The simulation results have been compared with those in the literature and it can be concluded that the models are accurate and that Dymola and Modelica are tools well suited for simulations of the transient fuel cell system behaviour.
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9

Mareschal, Michel. "Non-equilibrium molecular dynamics simulations: Techniques and applications." In Modeling complex systems. AIP, 2001. http://dx.doi.org/10.1063/1.1386834.

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10

Stauffer, Dietrich. "Sociophysics simulations II: opinion dynamics." In MODELING COOPERATIVE BEHAVIOR IN THE SOCIAL SCIENCES. AIP, 2005. http://dx.doi.org/10.1063/1.2008591.

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Звіти організацій з теми "Dynamic modeling and simulations"

1

Chand, K., W. Henshaw, and T. Vassilevska. Reduced order modelling for dynamic simulations: LDRD feasibility study final report. Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1059464.

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2

MALCZYNSKI, LEONARD A., WALTER E. BEYELER, STEPHEN H. CONRAD, DAVID B. HARRIS, PAUL E. REXROTH, and ARNOLD B. BAKER. Regional Dynamic Simulation Modeling and Analysis of Integrated Energy Futures. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/809601.

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3

Ramalingam, Jaisankar, Sherri Chandra, and Ravi Thyagarajan. Reduced Order Modeling for Rapid Simulations of Blast and Rollover Events of a Ground Vehicle and its Occupants Using Rigid Body Dynamic Models. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada585048.

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4

Verburg, Peter H., Žiga Malek, Sean P. Goodwin, and Cecilia Zagaria. The Integrated Economic-Environmental Modeling (IEEM) Platform: IEEM Platform Technical Guides: User Guide for the IEEM-enhanced Land Use Land Cover Change Model Dyna-CLUE. Inter-American Development Bank, 2021. http://dx.doi.org/10.18235/0003625.

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The Conversion of Land Use and its Effects modeling framework (CLUE) was developed to simulate land use change using empirically quantified relations between land use and its driving factors in combination with dynamic modeling of competition between land use types. Being one of the most widely used spatial land use models, CLUE has been applied all over the world on different scales. In this document, we demonstrate how the model can be used to develop a multi-regional application. This means, that instead of developing numerous individual models, the user only prepares one CLUE model application, which then allocates land use change across different regions. This facilitates integration with the Integrated Economic-Environmental Modeling (IEEM) Platform for subnational assessments and increases the efficiency of the IEEM and Ecosystem Services Modeling (IEEMESM) workflow. Multi-regional modelling is particularly useful in larger and diverse countries, where we can expect different spatial distributions in land use changes in different regions: regions of different levels of achieved socio-economic development, regions with different topographies (flat vs. mountainous), or different climatic regions (dry vs humid) within a same country. Accounting for such regional differences also facilitates developing ecosystem services models that consider region specific biophysical characteristics. This manual, and the data that is provided with it, demonstrates multi-regional land use change modeling using the country of Colombia as an example. The user will learn how to prepare the data for the model application, and how the multi-regional run differs from a single-region simulation.
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5

Matei, Ion, and Conrad E. Bock. Modeling Methodologies and Simulation for Dynamical Systems. National Institute of Standards and Technology, 2012. http://dx.doi.org/10.6028/nist.ir.7875.

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6

Cohen, Paul R., James A. Davis, and John L. Warwick. Dynamic Visualization of Battle Simulations. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada461163.

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7

Cipiti, Benjamin B. CoDCon Dynamic Modeling. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1346332.

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8

Lopez Bautista, Cesar Augusto, and Sandrasegaram Gnanakaran. Integrating CryoEM and Molecular dynamic simulations. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1498008.

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9

Wirth, B. D., M. J. Caturla, and Diaz de la Rubia, T. Modeling and Computer Simulation: Molecular Dynamics and Kinetic Monte Carlo. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/792741.

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10

Mattsson, Thomas Kjell Rene, Michael Paul Desjarlais, Gary Stephen Grest, et al. Modeling ramp compression experiments using large-scale molecular dynamics simulation. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1030397.

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