Дисертації з теми "Simplified dynamic method"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-16 дисертацій для дослідження на тему "Simplified dynamic method".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
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.
Повний текст джерелаRésumé: 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.
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.
Повний текст джерелаLi, Yi. "Effective Simplified Finite Element Tire Models for Vehicle Dynamics Simulation." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/97271.
Повний текст джерелаPHD
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.
Повний текст джерелаJabs, 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.
Повний текст джерелаWalker, 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.
Повний текст джерелаIn 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
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.
Повний текст джерелаEsteves, 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.
Повний текст джерелаThe 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
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.
Повний текст джерелаRockfall 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
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.
Повний текст джерелаLee, Meng-Hsien, and 李孟賢. "Simplified Method to Estimate the Dynamic Response of Soil-Structure Interaction of Secondary System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/34422574687581460008.
Повний текст джерела國立臺灣大學
土木工程學研究所
98
The key point of this thesis is integrating the soil-structure interaction system into the response spectrum method. Base on the traditional response spectrum method then adding the soil-interaction elements to get closer to the true response. The first purpose of simplified method is reducing the computation. Use the simple and convenient additional equivalent parameters to simulate the soil instead of the finite element method which is more complication. Get the additional mass, damping and stiffness parameters quickly and integrate into the combination system to modify the response of structure. Use modified combination system and takes soil affect in to condition to simplify the response structure method. Then it can be easily used by the basic components of structure and secondary system, for example the first period, damping ratio and the structure which it is connected, and use the design spectrum directly. In the chapter 5, 3 calculating examples shows the process of simplified method and compared with the state space solution, to check the applicability of the simplified method.
Ab-Wahab, Yunus Bin. "Development of the simplified method to evaluate dynamic mechanical analysis data on asphalt-aggregate mixtures." Thesis, 1993. http://hdl.handle.net/1957/36228.
Повний текст джерелаGraduation date: 1993
Rodrigues, André Filipe da Silva. "Viability and Applicability of Simplified Models for the Dynamic Analysis of Ballasted Railway Tracks." Doctoral thesis, 2017. http://hdl.handle.net/10362/21663.
Повний текст джерелаCampidelli, Manuel, Erasmo Viola, and Domenico Bruno. "Simplified Methods for Dynamic Analysis of Structures under Blast Loading." Thesis, 2007. http://hdl.handle.net/10955/764.
Повний текст джерелаThe increasing threat of extremely severe loading conditions caused by a number of explosive sources made engineers and scientists developing, during the last half century, several methods of analysis and design of blast–resistant structures. Simple, intermediate, and advanced computational approaches have been adopted, requiring increasing computational resources. These efforts led to the publication of several manuals and guidelines for the analysis and design of blast–resistant reinforced concrete and steel structures, mostly based on simple considerations derived from Single Degree of Freedom (SDOF) models. Although the development of future guidelines based on advanced numerical techniques is desirable, typical design activities cannot be effectively carried out by applying complex methods, because of their large demand of resources. Therefore the necessity to develop simplified, low time consuming, methods of analysis, capable of supporting a daily design activity and, at the same time, takeing into account issues usually neglected, such as a strong non linear material behavior and the influence of the strain rate caused by a blast load on the structural response. The development of such design tools is the object of this study. The first part of this thesis deals with the influence of the blast load shape on the dynamic response of an undamped linear elastic oscillator. Response spectrum and pressure–impulse diagrams are shown for several shape parameters, and a sensitivity analysis of the results with respect to the computational parameters is also presented. A method validation is carried out via genetic algorithms, through a careful calibration of all the genetic parameters, such as crossover fraction and number of elite elements. Non linear material modeling and strain rate dependent constitutive laws are objects of the second part of this dissertation. A non linear oscillator made of displacement, velocity, and acceleration dependent springs and dampers, under an arbitrary dynamic load, is proposed. Spring and damper constitutive laws have no restrictions as well as the load–time function, and the dynamic analysis is accomplished by a piecewise linear approximation of any input function. Numerical problems are dealt with by applying the Newton–Raphson method, in such a way that enables the error range to be estabiv lished “a priori”. Any possible drawback of this method is carefully avoided, and a quadratic speed of convergence is always ensured. Since the model provides velocity dependent springs, strain rate effects of blast loads on the structural response are taken into account by including strain rate dependent constitutive laws within the problem definition.
Università della Calabria
Padula, Joseph A. "A simplified method for estimating the load-shortening behavior of damaged tubular columns /." Diss., 1999. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:9935176.
Повний текст джерелаYongfeng, Lin, and 林永峯. "Simplified Numerical Simulation of Acenaphthylene Decomposition in a Plasma Reactor by Computational Fluid Dynamics Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/98433467015897767887.
Повний текст джерела國立屏東科技大學
環境工程與科學系所
100
The United States Environmental Protection Agency (US EPA) ranked acenaphthylene (Acpy) as 16 among polycyclic aromatic hydrocarbons (PAHs) in terms of priority air pollutants. Despite the use of plasma technology in recent years to treat and decompose toxic compounds, power consumption costs during plasma operations are prohibitively high. Reducing plasma operational costs and validating the destructive efficiency of toxic compounds by using plasma are thus of priority concern. This study simulated an atmospheric plasma reactor by using a method based on computational fluid dynamics (CFD). The commercial FLUENT code was then adopted to simulate the Acpy compound by using a three-dimensional atmospheric plasma reactor in order to treat cooking fume exhaust emitted from the restaurant kitchen. Next, parameters of the temperature, velocity mass fraction and efficiency of Acpy compound decompose in the code were examined to determine how they influence the atmospheric reactor. The numerical approach was based on refers to a specific finite volume method. The RNG κ-ε turbulence model, the SIMPLE algorithm and finite-rate eddy dissipation model were employed to solve in the combustion case. During simulation, the atmospheric plasma reactor size and operating parameters were taken from the self-designed atmospheric plasma reactor in our previous study (NSC95-2211-E020-020). Additionally, CFD simulation results and measurement data were compared and discussed. According to results, CFD simulation can reduce operating costs associated with plasma reactor experiments. Results of this study provide a valuable reference for efforts to treat air carcinogenic compounds by using an atmospheric plasma reactor.