Relevant bibliographies by topics / Simplified dynamic method

Academic literature on the topic 'Simplified dynamic method'

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Published: 14 March 2023

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Journal articles on the topic "Simplified dynamic method"

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Lin, Yueh-Jaw, and Hai-Yan Zhang. "Simplification of manipulator dynamic formulations utilizing a dimensionless method." Robotica 11, no. 2 (March 1993): 139–47. http://dx.doi.org/10.1017/s026357470001924x.

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SUMMARYThis paper presents a new approach for simplifying dynamic equations of motion of robot manipulators by using a nondimensionalization scheme. With this approach the dynamic analysis is done in a nondimensional space. That is, it is required to establish a dimensionless coordinate system in which the dynamic equations of motion of manipulators are formulated. The characteristic parameters of the manipulators are then defined by choosing proper physical quantities as basic units for nondimensionalization. Within the nondimensional space the Lagrange method is applied to the manipulator to obtain a set of general dimensionless equations of motion. This dimensionless dynamic formulation of manipulators leads to an easier way to simplify the dynamic formulation by neglecting insignificant terms using the order of magnitude comparison. The dimensionless dynamic model and its simplified version of PUMA 560 robot are implemented using the proposed approach. It is found that the simplified dynamic model greatly reduces the computation burden of the inverse dynamics. Simulation results also show that the simplified model is extremely accurate. This implies that the proposed nondimensional simplification emethod is reliable.
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Liang, Robert Y., and Abdallah I. Husein. "Simplified Dynamic Method for Pile‐Driving Control." Journal of Geotechnical Engineering 119, no. 4 (April 1993): 694–713. http://dx.doi.org/10.1061/(asce)0733-9410(1993)119:4(694).

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Kong, De Sen, Yan Qing Men, and Li Hua Wang. "A Simplified Computational Method of Lateral Dynamic Impedance of Single Pile." Advanced Materials Research 243-249 (May 2011): 2985–89. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2985.

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Research of the pile-soil interaction effect is a complicated issue in civil engineering. Using the principle of soil dynamics and structural dynamics, a simplified computational method for computing the lateral dynamic impedance of single pile embedded in layered non-homogeneous subsoil is established based on a certain assumptions. Both non-homogeneity of soil strata and softening effect of soil layer around pile during vibration as well as separation of pile-soil interface are simultaneously taken into account in the proposed computational method. The characteristics of the frequency-dependency of lateral dynamic stiffness and damping of pile are reproduced. It is shown through the comparative study on a numerical example that the numerical results of dynamic impedance of pile computed by the proposed method are relatively rational and can well agree with the computational and experimental results currently available.
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Zhao, Chongbin, and S. Valliappan. "Simplified Method for Dynamic Response of Tapered Structure." Journal of Engineering Mechanics 119, no. 7 (July 1993): 1486–92. http://dx.doi.org/10.1061/(asce)0733-9399(1993)119:7(1486).

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Kausel, Eduardo. "Simplified Method for Dynamic Response of Tapered Structure." Journal of Engineering Mechanics 121, no. 2 (February 1995): 346–50. http://dx.doi.org/10.1061/(asce)0733-9399(1995)121:2(346).

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Hughes, M., and A. Gh Podoleanu. "Simplified dynamic focus method for time domain OCT." Electronics Letters 45, no. 12 (2009): 623. http://dx.doi.org/10.1049/el.2009.0672.

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Scargiali, F., A. Busciglio, F. Grisafi, and A. Brucato. "Simplified dynamic pressure method for measurement in aerated bioreactors." Biochemical Engineering Journal 49, no. 2 (April 2010): 165–72. http://dx.doi.org/10.1016/j.bej.2009.12.008.

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Demec, Peter. "Simplified Dynamic Analysis of Grinders Spindle Node." Technological Engineering 11, no. 1 (December 1, 2014): 11–15. http://dx.doi.org/10.2478/teen-2014-0002.

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Abstract The contribution deals with the simplified dynamic analysis of surface grinding machine spindle node. Dynamic analysis is based on the use of the transfer matrix method, which is essentially a matrix form of method of initial parameters. The advantage of the described method, despite the seemingly complex mathematical apparatus, is primarily, that it does not require for solve the problem of costly commercial software using finite element method. All calculations can be made for example in MS Excel, which is advantageous especially in the initial stages of constructing of spindle node for the rapid assessment of the suitability its design. After detailing the entire structure of spindle node is then also necessary to perform the refined dynamic analysis in the environment of FEM, which it requires the necessary skills and experience and it is therefore economically difficult. This work was developed within grant project KEGA No. 023TUKE-4/2012 Creation of a comprehensive educational - teaching material for the article Production technique using a combination of traditional and modern information technology and e-learning.
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Zhang, Zhi Ying, Ying Li, and Qing Sun. "A Simplified Model of SSI Dynamic Analysis." Advanced Materials Research 446-449 (January 2012): 334–39. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.334.

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Aiming at the problem of dynamic analysis of SSI system, the dynamic influence of different parts of foundation soil is studied on the linear elastic assumption according to the actual mechanism of Soil-Structure Interaction (SSI); in addition, a simplified model on the condition of the lumped mass method is put forward and the corresponding motion equations of SSI system are built, which can be a reference for the structural seismic design method considering SSI effect.
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Liu, Zhiyuan, Hongseng Zou, Miao Hui, Chen Dapeng, and Guo Lin. "Dynamic Finite Element Model Updating for On-load Tap Changer based on Super-model." MATEC Web of Conferences 256 (2019): 04001. http://dx.doi.org/10.1051/matecconf/201925604001.

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A method is presented for dynamic model updating of on-load tap changer (OLTC). Based on a sensitivity-based optimization method, the initial simplified finite element (FE) model of OLTC component is updated using the analytical results of the FE super-model. The objective of model updating is to reduce the frequency difference between the simplified FE model and the super-model, and to make the simplified model accurately represent dynamic characteristics of the super-model. The updated simplified models can be further used in the modeling and analysis of the whole OLTC model. The results, taking the base of OLTC as example, indicate that the dynamic behavior of the updated simplified model match well with that of the super-model. Subsequently, the dynamic behavior of OLTC assembled with the updated parts is further predicted by modal analysis. The presented method improves the calculation efficiency, as well as accuracy, which has broad application prospects for dynamic prediction of complex structures in engineering.
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Dissertations / Theses on the topic "Simplified dynamic method"

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Golzan, Seyyed Behnam. "Simplified design method for energy dissipating devices in retrofitting of seismically isolated bridges." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8948.

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Abstract: Highway bridges have great values in a country because in case of any natural disaster they may serve as lines to save people’s lives. Being vulnerable under significant seismic loads, different methods can be considered to design resistant highway bridges and rehabilitate the existing ones. In this study, base isolation has been considered as one efficient method in this regards which in some cases reduces significantly the seismic load effects on the structure. By reducing the ductility demand on the structure without a notable increase of strength, the structure is designed to remain elastic under seismic loads. The problem associated with the isolated bridges, especially with elastomeric bearings, can be their excessive displacements under service and seismic loads. This can defy the purpose of using elastomeric bearings for small to medium span typical bridges where expansion joints and clearances may result in significant increase of initial and maintenance cost. Thus, supplementing the structure with dampers with some stiffness can serve as a solution which in turn, however, may increase the structure base shear. The main objective of this thesis is to provide a simplified method for the evaluation of optimal parameters for dampers in isolated bridges. Firstly, performing a parametric study, some directions are given for the use of simple isolation devices such as elastomeric bearings to rehabilitate existing bridges with high importance. Parameters like geometry of the bridge, code provisions and the type of soil on which the structure is constructed have been introduced to a typical two span bridge. It is concluded that the stiffness of the substructure, soil type and special provisions in the code can determine the employment of base isolation for retrofitting of bridges. Secondly, based on the elastic response coefficient of isolated bridges, a simplified design method of dampers for seismically isolated regular highway bridges has been presented in this study. By setting objectives for reduction of displacement and base shear variation, the required stiffness and damping of a hysteretic damper can be determined. By modelling a typical two span bridge, numerical analyses have followed to verify the effectiveness of the method. The method has been used to identify equivalent linear parameters and subsequently, nonlinear parameters of hysteretic damper for various designated scenarios of displacement and base shear requirements. Comparison of the results of the nonlinear numerical model without damper and with damper has shown that the method is sufficiently accurate. Finally, an innovative and simple hysteretic steel damper was designed. Five specimens were fabricated from two steel grades and were tested accompanying a real scale elastomeric isolator in the structural laboratory of the Université de Sherbrooke. The test procedure was to characterize the specimens by cyclic displacement controlled tests and subsequently to test them by real-time dynamic substructuring (RTDS) method. The test results were then used to establish a numerical model of the system which went through nonlinear time history analyses under several earthquakes. The outcome of the experimental and numerical showed an acceptable conformity with the simplified method.
Résumé: Les ponts routiers ont une grande valeur dans un pays parce qu’en cas de catastrophe naturelle, ils peuvent servir comme des lignes pour sauver des vies. Étant vulnérable sous des charges sismiques importantes, on peut considérer différentes méthodes pour concevoir des ponts routiers résistants et également pour réhabiliter des ponts existants. Dans cette étude, l'isolation de la base a été considérée comme une méthode efficace qui peut réduire significativement les effets des charges sismiques sur la structure. En réduisant la demande en ductilité sur la structure sans une augmentation notable de force, la structure est conçue pour rester élastique sous des charges sismiques. Le problème associé aux ponts isolés, particulièrement avec des appuis en élastomère, peut être leurs déplacements excessifs sous les charges de service et de séisme. Ceci peut défier l’objectif d'utiliser des appuis en élastomère pour les ponts typiques de petite portée où les joints de dilatation et les dégagements peuvent aboutir à une augmentation significative des frais d'exploitation et de maintenance. Ainsi, supplémenter la structure avec des amortisseurs d’une certaine rigidité peut servir de solution, ce qui peut cependant augmenter l’effort tranchant transmis à la sous-structure. Cette étude a pour but de fournir une méthode simplifiée afin d’évaluer les paramètres optimaux des amortisseurs dans les ponts isolés. Dans cette thèse, premièrement, basé sur une étude paramétrique, quelques directions sont données pour l'utilisation de dispositifs d'isolation simples, dont les appuis en élastomère, afin de réhabiliter des ponts existant avec une haute importance. Les paramètres comme la géométrie du pont, les clauses des normes et le type de sol sur lequel la structure est construite ont été appliqués sur un pont typique de deux portées. Il est conclu que les paramètres mentionnés peuvent déterminer l'emploi d'isolement de la base des ponts routiers. À la deuxième phase, basé sur le coefficient de réponse élastique des ponts isolés, une méthode de conception simplifiée d’amortisseur pour des ponts routiers réguliers isolés à la base a été présentée dans cette étude. En sélectionnant des objectifs pour la réduction du déplacement et la variation de l’effort tranchant, la rigidité et l'amortissement exigés d'un amortisseur hystérétique peuvent être déterminés. L’étude s’est poursuivie par une modélisation numérique d’un pont à deux portées pour vérifier l'efficacité de la méthode. Pour un modèle numérique d'un pont isolé typique, la méthode a été utilisée pour identifier des paramètres linéaires équivalents pour un certain déplacement et effort tranchant désigné. Par la suite, assumant un amortisseur de type hystérétique, les paramètres non linéaires de l’amortisseur ont été calculés et utilisés. La comparaison des résultats du modèle numérique sans amortisseur et avec l'amortisseur a démontré que la méthode proposée est suffisamment précise. Par la suite, un nouvel amortisseur hystérétique simple en acier a été conçu. Cinq spécimens ont été fabriqués de deux différents grades d’acier et ont été testés en combinaison avec un isolateur à l’échelle réelle dans le laboratoire de structures de l'Université de Sherbrooke. La procédure comprenait la caractérisation des spécimens par des tests cycliques en contrôle de déplacement et par la suite la réalisation d’essais par la méthode de sous-structuration dynamique en temps réel. Les résultats des essais ont été utilisés pour établir un modèle numérique du système qui a subi des analyses temporelles non linéaires sous plusieurs séismes. Le résultat des essais expérimentaux et numériques montrent une conformité acceptable avec la méthode simplifiée.
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Ramli, Muhd Harris Bin. "Dynamic Effects on Migration of Light Non-Aqueous Phase Liquids in Subsurface." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/189380.

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Li, Yi. "Effective Simplified Finite Element Tire Models for Vehicle Dynamics Simulation." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/97271.

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The research focuses on developing a methodology for modeling a pneumatic bias-ply tire with the finite element method for vehicle dynamics simulation. The tire as a load-carrying member in a vehicle system deserves emphasized formulation especially for the contact patch because its representation of mechanics in the contact patch directly impacts the handling and ride performance of a vehicle. On the other hand, the load transfer from the contact patch to the wheel hub is necessary for determining the inputs to a chassis. A finite element (FE) tire model has strong capability to handle these two issues. However, the high cost of computing resources restrains its application mainly in the tire design domain. This research aims to investigate how to balance the complexity of a simplified FE tire model without diminishing its capability towards representing the load transmission for vehicle dynamics simulation. The traditional FE tire model developed by tire suppliers usually consists of an extremely large number of elements, which makes it impossible to be included in a full-vehicle dynamics simulation. The material properties required by tire companies' FE tire models are protected. The car companies have an increasing need for a physical-based tire model to understand more about the interaction between the tire and chassis. A gap between the two sides occurs because the model used for tire design cannot directly help car companies for their purpose. All of these reasons motivate the current research to provide a solution to narrow this gap. Other modern tire models for vehicle dynamics, e.g. FTire or TAME, require a series of full-tire tests to calibrate their model parameters, which is expensive and time-consuming. One great merit of the proposed simplified FE tire model is that determining model inputs only requires small-scale specimen tests instead of full-tire tests. Because much of the usability of a model hinges on whether its input parameters are easily determined, this feature makes the current model low cost and easily accessible in the absence of proprietary information from the tire supplier. A Hoosier LC0 racing tire was selected as a proof of modeling concept. All modeling work was carried out using the general purpose commercial software Abaqus. The developed model was validated through static load-deflection test data together with Digital Image Correlation (DIC) data. The finite element models were further evaluated by predicting the traction/braking and cornering tire forces against Tire Test Consortium (TTC) data from the Calspan flat-track test facility. The emphasis was put on modeling techniques for the transient response due to the lack of available test data. The in-plane and out-of-plane performance of the Hoosier tire on the full-tire test data is used for model validation, not for "calibrating" the model. The agreement between model prediction and physical tests demonstrate the effectiveness of the proposed methodology.
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Wang, Yanchun. "Simplified methods for determining dynamic characteristics of tall wall-frame buildings." Thesis, University of Hertfordshire, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323652.

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Jabs, Fredrick W. "Simplified Tools and Methods for Chassis and Vehicle Dynamics Development for FSAE Vehicles." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342728980.

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Walker, Jessica Nicole. "Numerical Studies of Jet-Wing Distributed Propulsion and a Simplified Noise Metric Method." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34752.

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In recent years, the aircraft industry has begun to focus its research capabilities on reducing emissions and noise produced by aircraft. Modern aircraft use two to four engines arranged on the wing or behind to produce thrust that is concentrated directly behind the engine. Kuchemann suggested a way to improve the propulsive efficiency by changing the normal configuration of engine and aircraft. This concept is the jet-wing distributed propulsion idea, which redistributes the thrust across the span of the wings. Distributed propulsion is accomplished by using many smaller engines spread across the wings or several large engines to duct the exhaust flow in a jet-wing. The jet-wing concept can be used to reduce noise and also as a replacement for flaps and slats by deflecting the jet. Since the distributed propulsion concept is also a method to reduce noise, it's important to have a simplified method of calculating the trailing edge noise of a wing.

One of the purposes of this paper was to study the effect of adding jet-wing distributed propulsion to a thick "inboard" airfoil. The two-dimensional jet-wing model was analyzed by parametric computational fluid dynamic (CFD) studies using the Reynolds-averaged, finite-volume, Navier-Stokes code GASP. The model was set up to be self-propelled by applying velocity and density boundary conditions to the blunt edge of the airfoil. A thick "inboard" airfoil from a realistic transonic wing was needed for the study and so the span station of the EET Wing was chosen. This airfoil was thick with a thickness to chord ratio of 16%. In adding distributed propulsion to this thick airfoil, it was found that there was an increase in the propulsive efficiency as compared to typical modern high-bypass-ratio turbofan engines with no negative aerodynamic consequences.

The other purpose of this study was to create and assess a simplified method to calculate the trailing edge noise metric value produced by an airfoil. Existing methods use RANS CFD, which is computationally expensive and so it seemed important to find a less expensive method. A method was formed using the Virginia Tech Boundary Layer Java Codes which calculated the characteristic turbulent velocity and characteristic turbulent length scale. A supercritical airfoil, SC(2)-0714, was used to assess the simplified method as compared to the more computationally expensive GASP runs. The results showed that this method has trends that follow those of the GASP results with the method compare well up to modest lift coefficients.
Master of Science

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Chen, Qing [Verfasser]. "Numerical investigation of internal flow in hydraulic valves and dynamic interactions in hydraulic systems with CFD and simplified simulation methods / Qing Chen." Aachen : Shaker, 2005. http://d-nb.info/1181607736/34.

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Esteves, Nicolas. "Modélisation thermique et aéraulique des alternateurs pour les simulations de l’espace sous capot d’un véhicule automobile." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI124.

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Le but de ces travaux est de créer un modèle aérothermique, avec un temps de calcul court, d’un alternateur automobile intégré au sein d’une simulation complète d’un environnement sous-capot d’un véhicule. La prise en compte de leur influence au sein d'un comportement moteur est recherchée. Un modèle simplifié permettant la simulation du comportement aéraulique et thermique d’un alternateur a été développé. Il utilise une approche nodale afin de simuler les phénomènes thermiques et aérauliques du système. Différents algorithmes et une interface homme-machine permettent un paramétrage facile et rapide, et une implémentation automatique du modèle. En effet, le paramétrage du réseau nodal est fait automatiquement, l’utilisateur doit seulement rentrer les différents paramètres du système : dimensions, caractéristiques matériaux, pertes thermiques... Cela nous permet d’avoir aussi un modèle adaptable facilement à tout type d’alternateur. Le comportement aéraulique de l’alternateur est simulé via des coefficients de convection, intégrés au réseau nodal. Ces coefficients sont déterminés via des corrélations en fonction du nombre de Reynolds de l’écoulement. Pour chaque zone de l’écoulement d’air dans l’alternateur, ces corrélations ont été identifiées via une modélisation CFD de l’alternateur, lui-même validé par des essais aérauliques sur banc expérimental. Le modèle a été vérifié et validé via des essais expérimentaux thermiques. Il présente une erreur moyenne inférieure à 10%, et fonctionne sur l’ensemble des régimes d’utilisation. Il présente un temps de calcul de l’ordre de 2 minutes. Le modèle a été intégré dans une simulation simplifiée d’un environnement sous-capot. Une méthodologie de couplage a été développée, permettant l’intégration des données du modèle simplifié, au sein des simulations sous-capot. Ces simulations modélisent le comportement thermique des environnements sous-capot ainsi que le compartiment aéraulique. Les flux d’air sont simulés et le couplage du modèle simplifié permet d’intégrer l’influence thermique de l’alternateur, au sein de l’environnement sous-capot, ainsi que l’impact aéraulique de ce dernier. La méthodologie de couplage permet d’importer les valeurs de températures et de débits, estimées par le modèle simplifié, au sein du maillage d’une CAO de l’alternateur. Ces travaux sont en cours d’intégration dans les processus numériques du Groupe PSA. Différentes perspectives sont en cours d’étude, afin d’utiliser ce modèle sur d’autres éléments du sous-capot, ou d’autres machines tournantes, comme des moteurs électriques présents sur les véhicules hybrides et électriques
The objective of the thesis is to create a thermal model of an alternator, with a quickly time run. This model will integrate the influence of the alternator inside an under-hood simulation. A simplify model able to simulate the aerodynamic and thermal behaviour has developed. It use a nodal approach to simulate the aerodynamic and thermal behaviour. Different algorithms and an user’s interface able to a quickly set up and a automatically implementation. Indeed, the nodal, approach was realized automatically by the model, the user inform the dimensions of the alternator, the materials characteristics and the thermal losses. Thanks to we have a model that use with any automobile alternator. The aerodynamic of the alternator is simulate with convection coefficient via the nodal approach. These coefficients are estimated with correlations based on Reynolds of the flow. The CFD simulation of the alternator identified these correlations. The CFD model has been validate with an aerodynamics tests. The model is checked and validate by thermal tests. It has an average error lower than 10% and work to any regime of the use. The time run is equal to 2 minutes. The modal has been integrate inside an under-hood simulation. A coupling methodology has been developed to allow the integration of the data, like the temperatures and the flowrate was estimate by the simplify model, inside an under-hood simulation. The under-hood simulation modelling the aerodynamic and thermal behaviour of the engine compartment. Therefore, the coupling methodology allow integrating the aerodynamic and thermal influence of the alternator inside the compartment. The work is actually in progress inside the numerical processes of the PSA group. Many perspectives are studied, to use the model on other under-hood elements, or other electric machine, like the electric engines used inside the hybrid vehicles
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Boulaud, Romain. "Etudes et modélisations du comportement d’un écran de filet pare-blocs à différentes échelles." Thesis, Paris Est, 2020. http://www.theses.fr/2020PESC2017.

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Les écrans de filet pare-blocs sont des ouvrages de protection souples utilisés pour protéger les habitants ainsi que leurs biens du danger des éboulements rocheux dans les régions à risques. Ces structures placées sur la trajectoire des masses en mouvement sont formées d’un filet métallique maintenu au terrain naturel par des poteaux rigides. Lorsqu’elles sont impactées par un bloc, elles subissent des grandes déformations qui nécessitent de modéliser leur comportement en tenant compte de non-linéarités à la fois géométriques et matérielles. Leurs composants sont ainsi représentés dans ce travail par des éléments discrets et le problème mécanique est résolu quant à lui avec un outil de calcul numérique adapté aux grandes transformations. Cet algorithme est ensuite utilisé pour évaluer l’influence de différentes stratégies de modélisation de la nappe de filet, toutes tirées de la littérature scientifique, sur le comportement global d’un écran de protection pare-blocs. Les conclusions de cette étude ainsi que des observations expérimentales ouvrent la voie vers de nouvelles stratégies de modélisation discrète, pour lesquelles le filet est représenté par un nombre restreint de degrés de liberté. La famille de modèles simplifiés développée dans ce travail permet de simuler le comportement d’un ouvrage avec des faibles coûts en temps de calcul, offrant ainsi l’opportunité de mettre en œuvre des études paramétriques complexes et des méthodes de dimensionnements probabilistes
Rockfall barriers are flexible structures that mitigate the risk of rockfall and thus protect people living in risk areas, as well as their property. These structures, placed on the trajectories of the moving blocks, are made of a steel net held on the natural ground by rigid posts. When they are impacted, they undergo large deformations that require modelling their behaviour by taking into account both geometric and material non-linearities. Their components are therefore represented in this work with discrete elements and the mechanical problem is thus solved with a calculation tool adapted to the large déformations problem. This algorithm is also used to assess the influence of different net modelling strategies, from the scientific literature, on the overall behaviour of a rokfall barrier. The conclusions of this study as well as experimental observations pave the way to new discrete modelling strategies, for which the net is represented by a limited number of degrees of freedom. The family of simplified models developed in this work makes it possible to simulate the behaviour of a structure with a low computation time costs, thus offering the opportunity of implementing complex parametric studies or probabilistic dimensioning methods
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Ghavamian, Shahrokh. "Méthode simplifiée pour la simulation du comportement sismique des structures en béton armé : traitement des effets de l'élancement et estimateur d'erreurs." Cachan, Ecole normale supérieure, 1998. http://www.theses.fr/1998DENS0007.

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Le traitement en dynamique non linéaire du fonctionnement des structures en b. A. Est un problème complexe et couteux. L'aborder par des méthodes simplifiées est une solution avantageuse, a la condition de pouvoir conserver une description fine et réaliste des phénomènes majeurs. Analyse dans l'environnement d'une méthode par éléments finis multicouches, il a porte sur deux aspects majeurs : celui du traitement de l'élancement et celui de l'évaluation des erreurs liées a la discrétisation. Le code de calcul eficos initialement conçu avec des éléments poutres de type Navier-Bernoulli composés de couches superposées, permettait d'étudier le comportement d'un grand nombre d'éléments structuraux de type poutre/poteau, tant que leur élancement ne posait pas de difficultés particulières. La stratégie proposée ici permet de prendre en considération les effets de moment du second ordre. Ceci ajoute aux précédents travaux réalises sur les effets de cisaillement conduisent a un nouvel outil adapte, vis-à-vis de l'élancement, a un large domaine d'applications. S'agissant des grands déplacements, la méthode proposée, pour la prise en compte de l'effet p-delta en comportement en dommageable, a été appliquée au cas de poteaux en béton charges jusqu'a la ruine ; la comparaison avec l'expérience montre l'efficacité de la méthode. Des applications en réponse non linéaire sismique de piles de montre la capacité de l'outil à reproduire les principaux aspects critiques relatifs a la double non linéarité, matérielle et géométrique. Du cote des faibles élancements, l'étude réalisée dans le cadre du benchmark nupec met en évidence la bonne performance de la stratégie de modélisation simplifiée proposée, pour un mur arme de très faible élancement (inferieur a 1). Cependant, la qualité des résultats, notée par les organisateurs du benchmark comme étant de même niveau que ceux obtenus en éléments finis 2d ou 3 d, doit être associée à une représentation adaptée des conditions aux limites. L'étude est complétée par la proposition d'un estimateur d'erreurs dont la pertinence vis-a-vis de la discrétisation en éléments finis est montrée, aussi bien en statique qu'en dynamique. Une corrélation énergétique est également mise en évidence. C'est un nouveau pas vers l'optimisation et la fiabilité des analyses.
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Books on the topic "Simplified dynamic method"

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Davies, C. A simplified self-adaptive grid method, SAGE. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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E, Venkatapathy, and Ames Research Center, eds. A simplified self-adaptive grid method, SAGE. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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Davies, C. A simplified self-adaptive grid method, SAGE. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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Fire and Blast Information Group (Firm). Simplified methods for analysis of response to dynamic loading. Ascot: Steel Construction Institute, 2002.

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Ab-Wahab, Yunus Bin. Development of a simplified method to evaluate dynamic mechanical analysis data on asphalt-aggregate mixtures. 1993.

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Mesinger, Fedor, Miodrag Rančić, and R. James Purser. Numerical Methods in Atmospheric Models. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190228620.013.617.

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The astonishing development of computer technology since the mid-20th century has been accompanied by a corresponding proliferation in the numerical methods that have been developed to improve the simulation of atmospheric flows. This article reviews some of the numerical developments concern the ongoing improvements of weather forecasting and climate simulation models. Early computers were single-processor machines with severely limited memory capacity and computational speed, requiring simplified representations of the atmospheric equations and low resolution. As the hardware evolved and memory and speed increased, it became feasible to accommodate more complete representations of the dynamic and physical atmospheric processes. These more faithful representations of the so-called primitive equations included dynamic modes that are not necessarily of meteorological significance, which in turn led to additional computational challenges. Understanding which problems required attention and how they should be addressed was not a straightforward and unique process, and it resulted in the variety of approaches that are summarized in this article. At about the turn of the century, the most dramatic developments in hardware were the inauguration of the era of massively parallel computers, together with the vast increase in the amount of rapidly accessible memory that the new architectures provided. These advances and opportunities have demanded a thorough reassessment of the numerical methods that are most successfully adapted to this new computational environment. This article combines a survey of the important historical landmarks together with a somewhat speculative review of methods that, at the time of writing, seem to hold out the promise of further advancing the art and science of atmospheric numerical modeling.
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Railsback, Steven F., and Bret C. Harvey. Modeling Populations of Adaptive Individuals. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691195285.001.0001.

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Ecologists now recognize that the dynamics of populations, communities, and ecosystems are strongly affected by adaptive individual behaviors. Yet until now, we have lacked effective and flexible methods for modeling such dynamics. Traditional ecological models become impractical with the inclusion of behavior, and the optimization approaches of behavioral ecology cannot be used when future conditions are unpredictable due to feedbacks from the behavior of other individuals. This book provides a comprehensive introduction to state- and prediction-based theory, or SPT, a powerful new approach to modeling trade-off behaviors in contexts such as individual-based population models where feedbacks and variability make optimization impossible. This book features a wealth of examples that range from highly simplified behavior models to complex population models in which individuals make adaptive trade-off decisions about habitat and activity selection in highly heterogeneous environments. The book explains how SPT builds on key concepts from the state-based dynamic modeling theory of behavioral ecology, and how it combines explicit predictions of future conditions with approximations of a fitness measure to represent how individuals make good—not optimal—decisions that they revise as conditions change. The resulting models are realistic, testable, adaptable, and invaluable for answering fundamental questions in ecology and forecasting ecological outcomes of real-world scenarios.
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Danielson, Michael S. A Theory of Migration and Municipal Politics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190679972.003.0006.

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This chapter develops a series of theoretical models of migrant hometown political engagement and municipal politics in Mexico. The models seek to represent the relationship between the dominant political group in the community and emerging migrant actors. The chapter begins by outlining a set of basic assumptions about the characteristics and goals of the key actors in a stylized municipality, before and after the emergence of migrants as an important group. After establishing this context, the model is simplified to focus on the strategic interactions between migrants and prevailing authorities, first with a dynamic algorithm and then as a game theory model. Both migrants and prevailing authorities can choose conforming or fighting strategies; and depending on what each chooses, four outcomes are possible. Game-theory methods are then used to predict actor choices under different conditions and several limits to these models are discussed.
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Book chapters on the topic "Simplified dynamic method"

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Takabatake, Hideo, Yukihiko Kitada, Izuru Takewaki, and Akiko Kishida. "Engineering Method to Create Restoring Force Characteristics." In Simplified Dynamic Analysis of High-Rise Buildings, 271–77. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7185-1_11.

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Echeverry Jaramillo, Sara, Marine Geers, Loïc Buldgen, Jean-Philippe Pecquet, and Philippe Rigo. "Resistance of Plane Lock Gates Subjected to Ship Impact." In Lecture Notes in Civil Engineering, 611–22. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_53.

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AbstractThis paper presents the analysis of lock gates submitted to ship impacts. This problem is generally approached in two different ways: firstly, by the use of an equivalent static method, in which the impact is modeled by a quasi-static force, or by the use of dynamic numerical simulations, during which the progress of the ship and the temporal evolution of the impact force is taken into account. The second approach requires extensive calculation and modeling efforts, which are generally prohibitive in the early design stage.A simplified analytical method is presented to evaluate the resistance of such structures when impacted by a ship. The principle is based in the super-element method, firstly evaluating the resistance of the lock gate in local deformation mode, assuming crushing only of certain structural elements in a limited zone, located in the close vicinity of the impact. Secondly, the entire resistance of the lock gate is calculated, considering the global deformation mode, assuming a bending of the entire structure.The scientific objective is to extend this approach to lock gates which cannot currently be treated with this method, in particular those where the layout of the stiffening elements can be highly irregular. This implies to study thoroughly the global deformation modes of the structure and the plastic mechanisms involved in the energy dissipation, in order to predict a correct displacement field and resistance force.
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Kasmai, P. N., J. H. Prevost, and J. Zarka. "Simplified Dynamic Analysis of Civil Engineering Structures." In Finite Element Methods for Nonlinear Problems, 555–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82704-4_31.

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Takabatake, Hideo. "Static and Dynamic Analyses of Rectangular Normal Plates." In Simplified Analytical Methods of Elastic Plates, 3–24. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_1.

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Takabatake, Hideo. "Static and Dynamic Analyses of Circular Normal Plates." In Simplified Analytical Methods of Elastic Plates, 25–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_2.

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Takabatake, Hideo. "Static and Dynamic Analyses of Rectangular Cellular Plates." In Simplified Analytical Methods of Elastic Plates, 117–43. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_6.

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Takabatake, Hideo. "Static and Dynamic Analyses of Circular Cellular Plates." In Simplified Analytical Methods of Elastic Plates, 145–67. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_7.

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Takabatake, Hideo. "Effects of Dead Loads on Dynamic Problems of Beams." In Simplified Analytical Methods of Elastic Plates, 295–313. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_13.

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Takabatake, Hideo. "Static and Dynamic Analyses of Rectangular Plates with Voids." In Simplified Analytical Methods of Elastic Plates, 59–95. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_4.

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Takabatake, Hideo. "Static and Dynamic Analyses of Circular Plates with Voids." In Simplified Analytical Methods of Elastic Plates, 97–116. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0086-8_5.

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Conference papers on the topic "Simplified dynamic method"

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Collin, Lars Th. "INertia COLLection-A Simplified Dynamic Engine Test Method." In SAE International Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1985. http://dx.doi.org/10.4271/850132.

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Miar, Yasin, and Tyseer Aboulnasr. "Simplified DFT: A novel method for wideband spectrum sensing in cognitive radio." In 2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DYSPAN). IEEE, 2011. http://dx.doi.org/10.1109/dyspan.2011.5936262.

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Lie, Halvor, Zhen Gao, and Torgeir Moan. "Mooring Line Damping Estimation by a Simplified Dynamic Model." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29155.

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When predicting slowly varying resonant vessel motions, a realistic estimate of the motion damping is crucial. Mooring line damping, which is mainly induced by the drag force on line, can dominate the total damping of catenary moored systems and methods for predicting mooring line damping are therefore required. Based on a simplified dynamic model of mooring line tension, an approach to estimate the corresponding damping is presented in this paper. Short-term time domain simulations of dynamic line tension are carried out to verify the accuracy of the simplified frequency domain approach. Compared with the simulation results, the practical simplified method proposed herein gives a maximum 30% lower prediction of the damping coefficient of each mooring line and an about 20% smaller estimate of the total line damping and therefore yields conservative estimates of the low frequency vessel motions.
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Hussein, Mohamad, Brent Robinson, and Garland Likins. "Applications of a Simplified Dynamic Load Testing Method for Cast-in-Place Piles." In GeoSupport Conference 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40713(2004)24.

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Li, Hong-Nan, Ying Jia, and Su-Yan Wang. "Simplified Formulae of Dynamic Liquid Pressure in Rectangular Containers." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1956.

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In this paper, the N-S equation of fluid is solved by the Method of Volume of Fluid (VOF) to obtain the dynamic liquid pressure in a rectangle container. The fluid is incompressible, viscous and changeful with a free surface. The simplified simulating calculation formulae are given in order to apply the method to engineering on the basis of calculation results and analysis. Numerical simulations have shown that the formulae presented here are effective.
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Marger, Thibaut, Valerie Pommier-Budinger, J. Charles Mare, and Franc¸ois Malburet. "Managing the Hydraulic Characteristics of Control Spool Valves Through Simplified Manufacturing Process." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2611.

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This communication proposes an original method to define a low-cost manufacturing process for hydraulic spool valves in the case of very low production rate. A valve is usually completely defined by three characteristic curves obtained by two tests: a pressure gain test and a flow gain test. The aim is to limit the number of tests and in particular to avoid the flow gain test that is quite long to achieve. The method only uses a single metrology operation and the pressure gain curve to manage the spool flanks grinding while ensuring the specified hydraulic characteristics. The method is established by a model-based approach. It is then validated by experimental tests on two different valves.
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Sun, Hanxu, Yili Zheng, and Qingxuan Jia. "Dynamics Analysis and Control Method of a Novel Spherical Robot." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2676.

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A novel omni-directional rolling spherical robot equipped with a high-rate flywheel (BYQ-V) is presented; the mechanical structure of the robot are given, and the gyroscopic effects of high-rate flywheel can improve the dynamic stability of the robot. The simplified dynamic model of the robot is derived based on the constrained Lagrangian method. Moreover, a Linear Quadratic Regulator (LQR) controller and a Percentage Derivative (PD) controller are designed to implement the pose and velocity control of the robot respectively, Finally, the control method are validated through continuous circle motion experiment. This robot is designed for territory or lunar exploration in the future.
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Asgarian, B., A. Mohebbinejad, and R. H. Soltani. "Simplified Method to Assess Dynamic Response of Jacket Type Offshore Platforms Subjected to Wave Loading." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51383.

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Dynamic response of offshore platforms subjected to wave and current is of fundamental importance in analysis. The first step in dynamic analysis is computing dynamic characteristics of the structure. Because of pile-soil-structure and fluid-structure interactive effects in the dynamic behavior, the model is very complex. In this paper a simplified model for dynamic response of jacket-type offshore structures subjected to wave loading is used. Since wave loads on offshore platforms vary with time, they produce dynamic effects on structures. In the model used in this paper, all of the structural elements are modeled as vertical equivalent cylinders that are in the direction of the wave crest. In the simplified model, the degrees of freedom are considered at the seabed, jacket horizontal elevations and topside center of gravity. The stiffness properties of the model are computed considering the stiffnesses of the vertical bracings, legs and piles. The structural mass is considered as lumped nodal masses at horizontal elevations and topside center of gravity. The hydrodynamic added mass in addition to the structural masses was modeled at jacket horizontal elevations. In the simplified model, for computing wave loading, the projected areas of all members in the direction of the wave crest are considered. For the wave loading calculation, Morison equation is considered. The fluid velocities are calculated for the submerged portions of the structures using a computer program developed for this purpose. In this program both Airy and Stokes wave theories can be used. This model can be used to assess dynamic properties and responses of jacket type offshore structures. The model is used to assess the response of three jacket-type offshore platforms in Persian Gulf subjected to loadings due to several waves. The results in terms of dynamic characteristics and responses were compared with the more accurate analysis results using SACS software. The results are in a good agreement with the SACS analysis outputs, i.e. structural periods, mode shapes and dynamic response.
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Samanuhut, Patinya, and Atilla Dogan. "Dynamics Equations of Planetary Gear Sets for Shift Quality by Lagrange Method." In ASME 2008 Dynamic Systems and Control Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/dscc2008-2151.

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The equations of motion of planetary gear sets including pinion dynamics are derived using the Lagrange method. The Lagrange method provides a systematic procedure for derivation and yields a single set of equations that are valid for all gears and shifts for a given configuration. This procedure is applied to the coupled planetary gear set in GM Hydramatic 440 transmission. The planetary gear set equations along with a simplified engine, torque converter, friction elements and vehicle model are simulated for 2–3 and 3–4 shifts. The simulation results demonstrate that the equations derived for planetary gear sets can be used for studying shift quality.
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Tai, Meihua, and Masayoshi Tomizuka. "Dynamic Modeling of Multi-Unit Heavy Vehicles." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0316.

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Abstract In this paper, a unique method of deriving two kinds of models: simulation model and simplified control model for an arbitrary configuration of heavy vehicle (HV) system is proposed for the Automated Highway Systems (AHS). In the simulation model, each unit of a heavy vehicle system is considered as a free body with 6 degree of freedom unless constrained by the hitching mechanisms. The roll and pitch coupling due to constraints between connected units is investigated from the geometric point of view, and the dynamics of the hitching mechanisms are incorporated. A simplifed control model is obtained independent from the simulation model. By the proper application of Newtonian and Lagrangian mechanics to the different parts of the simplified model equations, the holonomic constraint forces are eliminated from the dynamic equations of motion. The control model is given in a closed form. As a special case, an open-loop simulation of tractor-semitrailer simulation model is presented.
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