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Добірка наукової літератури з теми "ENERGY DISSIPATORS"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "ENERGY DISSIPATORS"

Chaudhry, M. Hanif. "Energy dissipators." Canadian Journal of Civil Engineering 23, no. 4 (August 1, 1996): 987. http://dx.doi.org/10.1139/l96-905.

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Ou, Jin-Ping, Bo Wu, and T. T. Soong. "Performance Comparison of Passive Energy Dissipation Systems in Structural Applications – II: Nonlinear Reference System." Advances in Structural Engineering 1, no. 4 (October 1998): 261–72. http://dx.doi.org/10.1177/136943329800100403.

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In this paper, performance comparisons of representative passive energy dissipation devices when applied during the yielding phase of a structure are made. First, a single-degree-of-freedom nonlinear system is taken as the reference system and performance criteria are discussed according to its random response characteristics. Then, based on nonlinear random response analysis and equivalent stiffness and damping analogy, an equivalent linear model for the reference system without the energy dissipators and an equivalent unified model for the system with the dissipators are presented, by which the equivalent stiffness deterioration factor of the system with or without the energy dissipators and the dissipated hysteretic energy ratio of the dissipator to the reference system can be obtained. Finally, the performance criteria, including the reduction ratio of the controlled and uncontrolled displacement and absolute acceleration, the equivalent stiffness deterioration factor, and the dissipated hysteretic energy ratio are established for the reference system with the energy dissipators.

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Daneshfaraz, Rasoul, Ehsan Aminvash, Amir Ghaderi, Alban Kuriqi, and John Abraham. "Three-Dimensional Investigation of Hydraulic Properties of Vertical Drop in the Presence of Step and Grid Dissipators." Symmetry 13, no. 5 (May 18, 2021): 895. http://dx.doi.org/10.3390/sym13050895.

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In irrigation and drainage channels, vertical drops are generally used to transfer water from a higher elevation to a lower level. Downstream of these structures, measures are taken to prevent the destruction of the channel bed by the flow and reduce its destructive kinetic energy. In this study, the effect of use steps and grid dissipators on hydraulic characteristics regarding flow pattern, relative downstream depth, relative pool depth, and energy dissipation of a vertical drop was investigated by numerical simulation following the symmetry law. Two relative step heights and two grid dissipator cell sizes were used. The hydraulic model describes fully coupled three-dimensional flow with axial symmetry. For the simulation, critical depths ranging from 0.24 to 0.5 were considered. Values of low relative depth obtained from the numerical results are in satisfactory agreement with the laboratory data. The simultaneous use of step and grid dissipators increases the relative energy dissipation compared to a simple vertical drop and a vertical drop equipped with steps. By using the grid dissipators and the steps downstream of the vertical drop, the relative pool depth increases. Changing the pore size of the grid dissipators does not affect the relative depth of the pool. The simultaneous use of steps and grid dissipators reduces the downstream Froude number of the vertical drop from 3.83–5.20 to 1.46–2.00.

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Aiken, Ian D., Douglas K. Nims, and James M. Kelly. "Comparative study of four passive energy dissipation systems." Bulletin of the New Zealand Society for Earthquake Engineering 25, no. 3 (September 30, 1992): 175–92. http://dx.doi.org/10.5459/bnzsee.25.3.175-192.

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Passive energy dissipation devices have the potential to increase the seismic resistance of a structure by increasing its capability to dissipate energy and by reducing the seismic demand on the structure. They offer particular promise for seismic retrofitting as well as extensive applications in new construction. This paper describes and compares earthquake simulator tests of four new types of passive energy dissipators that were performed at the Earthquake Engineering Research Center of the University of California at Berkeley. The four types of energy dissipator are a Coulomb friction damper; a self-centering friction device in which the slip load is proportional to the slip displacement; a viscoelastic shear damper; and a shape memory alloy. Two different model structures were used in the experimental studies, and the energy dissipators were incorporated as part of the bracing systems of the structures.

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Grigorian, C. E., T. S. Yang, and E. P. Popov. "Slotted Bolted Connection Energy Dissipators." Earthquake Spectra 9, no. 3 (August 1993): 491–504. http://dx.doi.org/10.1193/1.1585726.

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Slotted Bolted Connections (SBCs) are modified bolted connections designed to dissipate energy through friction during rectilinear tension and compression loading cycles. Experimental results on two types of SBCs are reported. In one type, friction occurs between clean mill scale steel surfaces; in the other, friction is between clean mill scale steel and brass surfaces. The behavior of connections with brass on steel frictional surfaces is found to be more uniform and simpler to model analytically than that with steel on steel surfaces. These connections maintain essentially constant slip force, and unlike those with steel on steel surfaces, require minimal overstrength of the system in design. The frictional mechanisms giving rise to the observed behavior are explained. As an example of application a one story diagonally braced frame was designed and its behavior determined for four different earthquakes. Experimental results are presented for the fabricated SBC for this frame subjected consecutively to the four displacement histories derived from these earthquakes. The agreement between the analytical and experimental results is found to be excellent. Because of the intrinsic simplicity of the SBCs and their very low cost, their use in seismic design and retrofit applications appears to be very promising.

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Rajaratnam, N. "Energy dissipators and hydraulic jump." Canadian Journal of Civil Engineering 22, no. 3 (June 1, 1995): 649. http://dx.doi.org/10.1139/l95-075.

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Provorova, T. P. "Hydraulic calculation of energy dissipators." Hydrotechnical Construction 29, no. 10 (October 1995): 562–69. http://dx.doi.org/10.1007/bf02443044.

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Orekhov, Genrikh. "Pressure distribution and cavitation in counter-vortex flow energy dissipators of hydraulic spillways." MATEC Web of Conferences 251 (2018): 04034. http://dx.doi.org/10.1051/matecconf/201825104034.

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The article is devoted to the study of cavitation phenomena of counter-vortex flow energy dissipators that can be used in hydraulic spillways. The spillways providing the surface flow transitionn at hydraulic structures are equipped with energy dissipators of the discharged flow. An increase in the effective pressure on the hydropower project leads to an increase in the flow velocities and, hence , to an increase in the loads acting on the structures. One of such a manifestation is cavitation and cavitation erosion associated with it, which can lead to destruction of structures. The objective of the study consists in determining the cavitation characteristics of counter-vortex flow energy dissipators. The study was carried out by modeling using high-head physical models. The counter-vortex method of excess flow energy dissipation based on the work of viscous friction forces allows the flow energy to be dissipated in a very short part of the flow conductor system of the spillway. This feature of the counter-vortex flow energy dissipator imposes special requirements to the study of cavitation phenomena. The carried out studies resulted in obtaining the distribution of pressures lengthwise the flow conductor system of the energy dissipator with spiral swirls. The values of the cavitation coefficient and relative pressure at different points of the device are given. In the conclusions it is noted that the most dangerous part from the viewpoint of cavitation orrurence is the initial section of the flow energy dissipation chamber; cavitation due to flow separation and bubble cavitation occur within the flow and does not affect the structural elements; on a large-scale model working for 500 hours at pressures of up to 70 m cavitation erosion of the walls has not been detectd.

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Wang, Chengquan, Chongli Yin, Yun Zou, Boyan Ping, Xi Wu, Juan Liao, and Miaomiao Sun. "Numerical Investigations on Seismic Behavior of Segmental Assembly of Concrete Filled Steel Tube Piers with External Replaceable Energy-Dissipating Links." Materials 16, no. 3 (January 28, 2023): 1122. http://dx.doi.org/10.3390/ma16031122.

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In order to reduce the damage sustained by the substructure of bridges during an earthquake, reduce economic loss, avoid casualties, and ensure the quick repair of bridges after an earthquake, this paper, inspired by the good seismic performance of the rhombic opening in the shear wall structure, proposes a precast segmental concrete-filled steel tubular (PSCFST) pier with external replaceable energy-dissipating links (EREDL).Through finite element simulation analysis, it can be found that the energy dissipation capacity of a PSCFST pier with external EREDL is increased by 104% compared with that of a PSCFST pier without EREDL, and the lateral bearing capacity is increased by 76.9%. Through parameter analysis, it can be found that the change of initial prestress has little effect on the energy dissipation capacity of PSCFST piers, and the seismic performance of PSCFST piers can be improved by properly increasing the ultimate tensile strength of the energy dissipator materials. Compared with the energy dissipators made of Q235 steel, the energy dissipation capacity of PSCFST piers made of Q435 steel energy dissipators is increased by about 85.4%; At the same time, the thicker the energy dissipator, the stronger the energy dissipation capacity of the PSCFST pier, and the lateral bearing capacity is further improved.

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El-Sayed, Y. M., and R. A. Gaggioli. "The Integration of Synthesis and Optimization for Conceptual Designs of Energy Systems." Journal of Energy Resources Technology 110, no. 2 (June 1, 1988): 109–13. http://dx.doi.org/10.1115/1.3231363.

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The evolutionary process of system synthesis and the mathematical process of system optimization are integrated in one do-it-yourself software. A large number of flowsheet arrangements can be conveniently evaluated and optimized. The interactions among dissipations and dissipators can be monitored and analyzed to establish leading indicators to optimal configuration. The software is briefly described. An example problem demonstrates the integration of synthesis and optimization. The distribution of dissipations of the considered solutions to the problem are discussed.

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Більше джерел

Дисертації з теми "ENERGY DISSIPATORS"

Cruz, Cháidez Servio Tulio de la. "Contribution to the assessment of the efficiency of friction dissipators for seismic protection of buildings." Doctoral thesis, Universitat Politècnica de Catalunya, 2003. http://hdl.handle.net/10803/6229.

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Анотація:

Esta Tesis trata de la simulación numérica y experimental de estructuras de edificios equipadas con disipadores de energía de fricción, sujetos a cargas de sismo. La Tesis pretende contribuir a la evaluación de la eficacia de los disipadores de fricción para reducir la respuesta lateral de los edificios sujetos a sismos. Así, el objetivo global es la evaluación de la utilidad de los disipadores de fricción frente a las cargas sísmicas.

La Tesis está organizada de tal manera que sea fácil su seguimiento. Por esta razón, los capítulos se han escrito siguiendo una secuencia lógica. Una breve descripción de los capítulos se presenta a continuación.

El primer capítulo trata de los aspectos generales del Control Estructural con un especial énfasis en los disipadores de fricción, los cuales se incluyen en el llamado enfoque de 'Control Pasivo'.
El Capítulo 2 proporciona un repaso general al estado del conocimiento relativo a los principios de la fricción seca y a la investigación y aplicación de los dispositivos disipadores de fricción, así como a sus simulaciones numéricas.

Un procedimiento numérico ha sido desarrollado (programa ALMA) en los Capítulos 3 (edificios de una sola planta) y 4 (edificios de varias plantas) para llevar a cabo simulaciones numéricas de edificios equipados con disipadores de fricción y los resultados obtenidos fueron comparados a los que se obtuvieron con el programa comercial ADINA. La similitud entre los resultados de ambos programas es aceptable.

El Capítulo 5 describe los ensayos sobre una mesa vibratoria que se hicieron en dos modelos de edificios: uno de una sola planta y otro de dos plantas; ambos equipados con disipadores de fricción. Los resultados obtenidos se compararon a los resultados conseguidos con ALMA. Los resultados coinciden aceptablemente.

Luego de probar la validez del programa ALMA, éste se usó para hacer un estudio numérico preliminar para obtener la llamada 'carga óptima de deslizamiento' de los disipadores de fricción en el Capítulo 5. Las curvas que se pueden dibujar a partir de los resultados obtenidos con este estudio, pueden ser aplicadas para determinar las cargas óptimas de deslizamiento de edificios de una y varias plantas.

Finalmente, el Capítulo 7 contiene las conclusiones de esta Tesis y algunas propuestas para las futuras líneas de investigación.

Además, se han incluido cinco apéndices. El Apéndice A contiene los principios básicos del Análisis del Contacto. El Apéndice B trata de la solución numérica de las ecuaciones de movimiento para sistemas de uno y varios grados de libertada. Este apéndice está muy relacionado con el contenido de los Capítulos 3 y 4 de esta Tesis. El Apéndice C describe la solución de las ecuaciones de movimiento usando multiplicadores de Lagrange. El Apéndice D describe el equipo de laboratorio y la instrumentación usada en los ensayos. Los resultados de éstos, y la comparación entre éstos y los resultados numéricos (programa ALMA), son presentados en el Apéndice E.

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Izerrouken, Salah. "Contribution à la réduction des dissipations énergétiques dans les moto-ventilateurs à hautes vitesses." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0041/document.

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Le développement de turbomachines à faible vitesse spécifique suscite actuellement une forte demande dans de nombreux domaines industriels. De nos jours, les ventilateurs centrifuges constituées d'une roue, d'un diffuseur et d'un canal de retour sont largement utilisés dans de nombreuses applications telles que l'automobile, l'aéronautique, appareils domestiques, etc. En raison de leur grande adaptabilité, ils peuvent fonctionner sur une large plage de débit en particulier avec une vitesse de rotation importante. Cependant, leur utilisation nécessite une meilleure compréhension de leur fonctionnement et notamment de l'interaction rotor-stator pour mieux les concevoir. L'objectif de cette étude est d'analyser et de quantifier l'influence de la solidité des aubes du diffuseur (ou serrage des profils) sur les performances aérauliques du ventilateur centrifuge. Une étude numérique et expérimentale a été menée pour analyser les performances d'un ventilateur centrifuge avec différents niveaux d'interaction rotor-stator. Différentes géométries de diffuseur ont été proposées dans le but de réduire les dissipations énergétiques liées aux phénomènes de recirculation et aux forces de viscosité. L'étude approfondie de la norme ISO 5801 et ISO 5167 a permis de dimensionner et réaliser le banc d'essai et les organes de mesures. Ces normes proposent des calculs et des spécifications qui nous ont permis de fixer des critères quant au choix des éléments du banc d’essai AERO2VACCUM
Nowadays, centrifugal fans are widely used in many industrial applications such as automotive, aeronautic, vacuum cleaner, etc. Due to their high adaptability, they can operate over a wide flow range especially with high speed rotation. In order to reduce the impact on environment, centrifugal fan as other energy conversion system has to display a high efficiency. However, a better understanding of their working and of the rotor-stator interaction is required to enhance their design and to make them widely integrated in current applications. The purpose of this study is to analyze and to quantify the influence of the solidity vaned diffusers on the performance of a centrifugal fan. A computational study has been conducted to analyze the performance of a centrifugal fan under various levels of impeller-diffuser interactions. The objective was to understand the pressure recovery phenomena in each diffuser. Different geometries were proposed to reduce both separation flow phenomenon and viscous losses. The geometries are all composed with the same impeller and return channel, only the vaned diffusers differ; the trailing edges are maintained at the same position while the leading edges have different radial positions. The characterization of the fan has been realized by an experimental setup designed and built in agreement to the standards ISO 5801 and 516

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Buffon, Franco Turco. "Determinação de pressões em fossas de erosão a jusante de dissipadores tipo salto esqui." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/140937.

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Nesta dissertação estão apresentados os principais conceitos teóricos envolvidos na ação dos jatos formados em dissipadores tipo salto esqui sobre fossa de erosão pré-escavada, desde o trajeto do jato em sua fase aérea e em sua fase submersa, dando especial ênfase às pressões hidrodinâmicas e sua caraterização junto ao fundo da bacia. Para estudar experimentalmente a ação dos jatos nas bacias de dissipação, utilizou-se de um modelo físico de escala 1:100 construído no Laboratório de Obras Hidráulicas do IPH/UFRGS com ensaios de diferentes vazões e diferentes profundidades de fossas pré-escavadas. Os dados foram extraídos dos ensaios no modelo físico através de vasta instrumentação, utilizando-se comportas, pontas linimétricas, piezômetros, sensores de pressão, imagens e outros equipamentos. Foi realizada uma análise criteriosa dos dados gerados no modelo físico a partir das imagens do jato na sua trajetória aérea e no escoamento do jato em sua fase submersa, comparando os dados do modelo aos resultados obtidos por métodos tradicionais de cálculo. Também foram analisados os dados de pressão gerados durante os ensaios, sendo apresentados os resultados relativos às pressões médias e às pressões dinâmicas. As pressões dinâmicas observadas no modelo físico foram comparadas com as calculadas por meio de metodologia teórica abordada na bibliografia com a finalidade de avaliar a qualidade dessa metodologia para aplicação em projetos de engenharia, onde se observou grandes diferenças de magnitude da pressão quando em colchões rasos, e diferenças de distribuição de pressão ao longo do fundo da bacia de dissipação, principalmente quando em colchões profundos. No sentido de ajustar a metodologia aplicada, foi proposta a variação de parâmetros que regulam a forma do bulbo de pressões e a aplicação de um coeficiente de amortecimento de pressões, sendo que assim foi possível melhorar significativamente a distribuição e a magnitude das pressões calculadas devido à ação dos jatos no fundo da bacia de dissipação. Os resultados se mostram satisfatórios até determinada distância após o pico de pressão provocado pelo jato, sendo que após este ponto os efeitos de ressalto hidráulico prevalecem e devem ser pesquisados em estudos futuros.
In this dissertation are presented the main theorical concepts involved in the action of the jets formed in ski jump spillways on stilling basins type pre-excavated scour hole, from the path of the jet in its air stage and in his submerged phase, with particular emphasis on hydrodynamic pressures and its characterization by the bottom of the basin. To experimentally study the action of the jets in stilling basins, was used a physical model in scale 1:100 built in Hydraulic Works Laboratory of IPH/UFRGS with experiments of different flow rates and different depths of pre-excavated scour hole. The data were extracted from experiments on the physical model through extensive instrumentation, using gates, piezometers, pressure sensors, images and other equipment. A careful analysis of the data generated in the physical model from the jet images in your path through the air was performed and the flow of the jet in its submerged phase, comparing the model data to the results obtained by traditional methods of calculation. The pressure data generated during the tests and presented the results for the mean pressures and dynamic pressures were also analyzed. Dynamic pressures observed in the physical model were compared with those calculated by means of theoretical methods for the purpose of evaluating the quality of this methodology for use in engineering projects, where we observed large differences in magnitude of pressure when in shallow water beds, and diferences in pressure distribution over the stilling basin bottom, especially when in deep water beds. In order to adjust the applied methodology, it was proposed to change parameters governing the shape of the pressure bulb and the application of a pressure damping coefficient, and thus was possible to significantly improved the distribution and magnitude of the calculated pressures due to action of the jets in the stilling basin bottom. The results have been satisfactory up to a certain distance after the peak pressure caused by the jet, and after this point the hydraulic jump effects prevail and should be investigated in future studies.

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Aguirre, Herrera Santiago Alberto, and Barazorda Elio Andre Vidal. "Comportamiento estructural de una edificación esencial de mediana altura usando aisladores de base y disipadores SLB." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/654612.

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Este artículo consiste en analizar una nueva alternativa de control antisísmico de alta tecnología para la construcción de hospitales en el Perú, que en su normativa exige el uso de aislamiento de base para edificaciones esenciales. Para ello, se opta por la evaluación estructural de una edificación construida con aisladores sísmicos y la misma con implementación del sistema de disipación de energía SLB (Shear Link Bozzo). Los resultados analizados, para cada técnica estudiada de control antisísmico, son: derivas de entrepiso, aceleraciones de piso, balance energético y análisis de rotulas plásticas, en base a la filosofía de funcionalidad continua.
This article consists of analyzing a new high-tech anti-seismic control alternative for the construction of hospitals in Peru, which in its regulations requires the use of base insulation for essential buildings. For this, the structural evaluation of a building constructed with seismic isolators is chosen and the same with the implementation of the SLB (Shear Link Bozzo) energy dissipation system. The results analyzed for each anti-seismic control technique studied are: mezzanine drifts, floor accelerations, energy balance and analysis of plastic hinges, based on the philosophy of continuous functionality.
Trabajo de investigación

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Piedrafita, Francos Daniel. "Designing, testing and modelling two innovative non-conventional buckling restrained braces for seismic resistant buildings." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/284738.

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In this thesis two all-steel BRB have been designed, manufactured and tested, and both satisfy the testing protocols required by EU and US codes. They are composed of a steel slotted restraining unit which stabilizes the steel core. The first one, the Modular Buckling Restrained Brace (MBRB), is composed by several seriated modules which contain several dissipation units connected in parallel, which yield under shear forces. Although it has good hysteretic response and a high ductility, its core is heavy and expensive to manufacture. The second one,the Slotted Buckling Restraining Brace (SBRB), solves these two shortcomings. It yields under axial forces, like the conventional BRBs, but the usual solid core has been substituted by a perforated plate. The core is a one-piece element composed of two lateral bands, of a nearly uniform section and designed to yield, connected by stabilizing bridges, which behave elastic. The buckling prevention of the lateral bands is done by the restraining unit and the stabilizing bridges. Design expressions have been proposed to design both devices, and a numerical material model have been formulated and implemented in commercial finite element method software to numerically simulate the behavior of the braces, which will reduce the need of full scale tests for its design
En la present tesi, dos BVR totalment metàl·lics s’han dissenyat, fabricat i assajat, satisfent tots dos els requeriments dels protocols definits per les normes europees i americanes. Estan formats per un element de travat ranurat que estabilitza el nucli metàl·lic. El primer d’ells, el Braç de Vinclament Restringit Modular (BVRM), està format per diversos mòduls seriats que a la vegada contenen diverses unitats de dissipació, que plastifiquen sota esforços tallants, connectades en paral·lel. Tot i que té un bon comportament histerètic i una gran ductilitat, el nucli és pesat i difícil de fabricar. El segon braç, anomenat Braç de Vinclament Restringit Ranurat (BVRR), soluciona aquests inconvenients. Plastifica sota esforços axials, de la mateixa manera que els BVR convencionals, però el nucli massís és substituït per una platina perforada. Aquest nucli consisteix en un únic element composat per dos bandes laterals, dissenyades per a plastificar i amb una secció quasi constant, connectades per diversos ponts estabilitzadors que es mantenen sempre en el seu rang elàstic. Aquests ponts, juntament amb l’element de travat, impedeixen el vinclament de les bandes laterals. S’han proposat diverses expressions de disseny pels dos braços. S’ha formulat i implementat, en un programa d’elements finits comercial, un model de material per a simular numèricament el comportament dels braços, reduint així la dependència dels assajos a escala real durant el seu procés de disseny

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Asad, Mohammad. "Failure analysis and mitigating strategies for masonry walls subject to vehicular impacts." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/201381/1/Mohammad_Asad_Thesis.pdf.

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This thesis demonstrates how new materials and damping technologies were developed and applied to mitigate the adverse effects of vehicular crashes into masonry buildings. Many masonry buildings are vulnerable to vehicular crashes which result in loss of property, loss of habitat or functionality of the building and harm to the occupants of the building and vehicle. Auxetic materials were used in this research with negative Poisson ratio and innovative damping technologies at the wall edges to reduce the accident severity and to save the lives in both the building and the vehicle.

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Trad, Ayman. "Analyse du comportement et modélisation de structures souples de protection : le cas des écrans de filets pare-pierres sous sollicitations statique et dynamique." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00690546.

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En région montagneuse, les infrastructures et les voies de communications sont soumises à de nombreux risques naturels dont les phénomènes d'origine gravitaire. Au-delà du danger pour les usagers, les conséquences des interruptions du trafic deviennent problématiques d'un point de vue économique et il devient indispensable de sécuriser les itinéraires. La mise en place d'écrans de filets pare-pierres est une des solutions possibles pour la protection contre les éboulements rocheux. Cette thèse porte sur l'étude des écrans souples ou filets métalliques de protection contre les chutes de blocs et plus précisément sur l'écran développé par l'entreprise GTS. Le filet constitutif de ces écrans se différencie par rapport aux systèmes conventionnels par un comportement orthotrope, dû à un maillage spécifique. Dans cette étude nous caractérisons le comportement de ces écrans de filets sous des chargements statiques et dynamiques de type impact par une approche couplant l'expérimentation et la modélisation numérique. L'étude procède pas à pas, les divers constituants sont évalués de façon quasi-statique, en laboratoire, et également in-situ pour reproduire les conditions réelles d'utilisation, en particulier l'aspect dynamique. Une attention particulière concernant les dissipateurs d'énergie, qui représentent l'élément centrale de ce type de structure, nous a permis de mettre au point un élément fusible robuste et fiable. Une campagne d'essais en grandeur réel sur les écrans de filets étudiés a permis de valider deux classes énergétiques (3000 kJ et 5000 kJ) selon les recommandations européennes. Les données recueillis lors des expérimentations ont permis de calibrer et valider différentes modélisations numériques de type éléments finis et éléments discrets. La pertinence de la modélisation a été évaluée au niveau des différentes échelles étudiées, échelle d'une maille, échelle d'une nappe, échelle du dissipateur d'énergie et échelle de la structure entière. Les performances et les limites des deux approches, MEF (méthode des éléments finis) et MED (méthodes des éléments discrets) ont été évaluées pour ce qui est de nos modélisations.

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Jaui-Yao, Yeh, and 葉瑞堯. "Testing of Diagonal Bracing with Steel-Plate Energy Dissipators Under Cyclic Load." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/67597145111026268837.

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Lin, Hung-Yu, and 林宏宇. "A Study on Energy Dissipators and Local Scouring in Downstream of Check Dam." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/83600186757159976734.

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碩士
國立中興大學
土木工程學系
89
According to the related research about the scouring effects of free over-fall will be used in this study. The situation will be discussed in steady flow by using different energy dissipators — apron, water cushion and secondary dam. Facilities, the protected effect and the comparative characteristics of scouring hole will be found (such as the max. depth, max. length, shape factor and volume) in downstream of the energy dissipators. The result would be determined by energy dissipating theory, which is the relations between the scale of dissipators and energy variation. In view of energy disspators, the water cushion had the result of protection better than apron, because of the current hits mutually at the water pond. And the height factorβ=0.13 is the best. The situation of the secondary dam is the moving bed, therefore analysis of the scouring characteristic to make use energy variety of system. In both the rigid and soft energy disspators, the energy loss of scouring increased with slop. The degree of scouring depth and volume could be lowered effectively in rigid energy disspators. In water cushion, the average decreased rate of the scouring length about is 40 percent, and the scouring volume quantity decreases rate reaches 40 percent at least. Although, scouring length can’t be decreased at apron disspators. The scour phenomenon be mollified to a downstream region for protective effects. Scouring is more serious between major and secondary dam if the distance is too short from both of them. Character factorα>1.56 is the suggested application. In this experiment condition, a simple formula is proposed for a relevant establishment. It is expected to be helpful in designs of energy disspators.

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Moreira, Andreia Manuela Borges. "Numerical modelling of spillways and energy dissipators using the smoothed particle hydrodynamics method." Doctoral thesis, 2021. https://hdl.handle.net/10216/132628.

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Книги з теми "ENERGY DISSIPATORS"

Hager, Willi H. Energy Dissipators and Hydraulic Jump. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9.

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Hager, Willi H. Energy dissipators and hydraulic jump. Dordrecht: Kluwer Academic, 1992.

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Hydraulics of spillways and energy dissipators. New York: Marcel Dekker, 2005.

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Hydraulics of spillways and energy dissipators. New York: Marcel Dekker, 2005.

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D, Vischer, and Hager Willi H, eds. Energy dissipators. Rotterdam, Netherlands: A.A. Balkema, 1995.

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Hager, Willi H. Energy Dissipators and Hydraulic Jump. Springer, 2013.

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Hager, Willi H. Energy Dissipators and Hydraulic Jump. Springer London, Limited, 2013.

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Hager, Willi H. Energy Dissipators and Hydraulic Jump. Springer Netherlands, 2009.

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Khatsuria, R. M. Hydraulics of Spillways and Energy Dissipators. CRC Press, 2004. http://dx.doi.org/10.1201/9780203996980.

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Khatsuria, Rajnikant M. Hydraulics of Spillways and Energy Dissipators. Taylor & Francis Group, 2004.

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Частини книг з теми "ENERGY DISSIPATORS"

Ma, Xin, Yaan Hu, and Zhonghua Li. "Comparative Study of the Hydraulic Characteristics of Stratified Energy Dissipators in In-Chamber Longitudinal Culvert Systems." In Lecture Notes in Civil Engineering, 324–33. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_29.

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AbstractThe study of energy dissipation characteristics of stratified energy dissipators in the lock chamber is carried out by numerical simulation. Discussed the hydraulic characteristics of different energy dissipators in the lock chamber and open channel area (e.g., flow field in the lock chamber, flow distribution in the branch holes and energy dissipation mechanism). The results show that the stratified energy dissipation makes the water flow in the open ditch area more fully mixed; the flow distribution in the branch holes is more balanced; the maximum flow velocity into the bottom of the lock chamber is reduced. The in-chamber longitudinal culvert system with open channel + cover has the best flow conditions, followed by open channel + grating, both of the above are better than the traditional open ditch energy dissipator.

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Hager, Willi H. "Bucket-Type Energy Dissipator." In Energy Dissipators and Hydraulic Jump, 175–84. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_11.

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Hager, Willi H. "Introduction." In Energy Dissipators and Hydraulic Jump, 1–4. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_1.

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Hager, Willi H. "Expanding Channel." In Energy Dissipators and Hydraulic Jump, 151–74. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_10.

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Hager, Willi H. "Various Aspects of Stilling Basins." In Energy Dissipators and Hydraulic Jump, 185–212. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_12.

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Hager, Willi H. "Types of Stilling Basins." In Energy Dissipators and Hydraulic Jump, 213–28. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_13.

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Hager, Willi H. "Experiences with Stilling Basins." In Energy Dissipators and Hydraulic Jump, 229–38. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_14.

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Hager, Willi H. "Classical Hydraulic Jump." In Energy Dissipators and Hydraulic Jump, 5–40. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_2.

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Hager, Willi H. "Sloping Jump." In Energy Dissipators and Hydraulic Jump, 41–52. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_3.

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Hager, Willi H. "Hydraulic Jump in Non-Rectangular Channel." In Energy Dissipators and Hydraulic Jump, 53–66. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8048-9_4.

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Тези доповідей конференцій з теми "ENERGY DISSIPATORS"

Neyra Torres, Jose Luis, Neicer Campos Vasquez, Ruben Kevin Manturano Chipana, Eduardo Lizana Gamarra, David Antonio Guerra-Quispe, and Luisa Andrea López Lau. "Performance Analysis of Energy Dissipators Implemented in Buildings." In 21st LACCEI International Multi-Conference for Engineering, Education and Technology (LACCEI 2023): “Leadership in Education and Innovation in Engineering in the Framework of Global Transformations: Integration and Alliances for Integral Development”. Latin American and Caribbean Consortium of Engineering Institutions, 2023. http://dx.doi.org/10.18687/laccei2023.1.1.556.

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Amaddeo, Carmen, Gianmario Benzoni, Enzo D'Amore, Adolfo Santini, and Nicola Moraci. "Structural Health Monitoring of a Bridge with Energy Dissipators." In 2008 SEISMIC ENGINEERING CONFERENCE: Commemorating the 1908 Messina and Reggio Calabria Earthquake. AIP, 2008. http://dx.doi.org/10.1063/1.2963752.

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DONG, JIANWEI, WEILIN XU, JUN DENG, SHANJUN LIU, and WEI WANG. "NUMERICAL SIMULATION OF TURBULENT FLOW THROUGH THROAT-TYPE ENERGY-DISSIPATORS." In Proceedings of the 13th IAHRߝ;APD Congress. World Scientific Publishing Company, 2002. http://dx.doi.org/10.1142/9789812776969_0067.

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Goel, Arun. "Laboratory Investigations on Development of Energy Dissipators for Square Shaped Outlets." In World Environmental and Water Resources Congress 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40976(316)215.

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Giacomini, Anna, Giani Giani, and M. Migliazza. "Quasi-Static and Dynamic Response of Energy Dissipators for Rockfall Protection." In First Southern Hemisphere International Rock Mechanics Symposium. Australian Centre for Geomechanics, Perth, 2008. http://dx.doi.org/10.36487/acg_repo/808_64.

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Wudi, Václav, Petr Štemberk, and Yuliia Khmurovska. "LBM-based analysis of concrete flow for rapid prototyping of spillway energy dissipators." In 24TH TOPICAL CONFERENCE ON RADIO-FREQUENCY POWER IN PLASMAS. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0136915.

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Villalba Morales, Jesús Daniel, AMADEO BENAVENT-CLIMENT, FRANCISCO LOPEZ-ALMANSA, and DAVID ESCOLANO-MARGARIT. "A HEURISTIC APPROACH FOR OPTIMAL DESIGN OF BRACE-TYPE HYSTERETIC DISSIPATORS FOR SEISMIC PROTECTION OF FRAMED BUILDINGS." In The 16th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures. Russian Association for Earthquake Engineering and Protection from Natural and Manmade Hazards, 2019. http://dx.doi.org/10.37153/2686-7974-2019-16-1162-1162.

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Guzel, Birhan U., Mahesh Prakash, Eren Semercigil, and Ozden Turan. "Energy Dissipation with Sloshing for Absorber Design." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79838.

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Sloshing is the low frequency oscillation of the free surface of a liquid in a partially full container. Due to its detrimental effects, efforts are usually made in the direction of suppressing sloshing. In addition, intentionally induced sloshing may be employed as an effective energy sink to provide protection for resonant structures exposed to excessive vibration levels. It is generally reported that sloshing absorbers with shallow levels of liquid are more effective energy dissipators than those with deep levels. However, there has not yet been a study to reveal the mechanism of energy dissipation for practical applications, although there has been ample empirical proof for effectiveness. One of the limitations from a numerical perspective lies with the difficulty in predicting extreme free surface behaviour by traditional grid based computational methods. The objective of this paper is to report initial observations in this direction using Smoothed Particle Hydrodynamics (SPH). SPH is a Lagrangian method of solving the equations for fluid flow, that is suitable for modeling free surface phenomena such as sloshing due to its grid-free nature. Results are reported in this paper in the form of numerical case studies.

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Araujo Rodriguez, Gustavo Adolfo, Barbara G. Simpson, Tu X. Ho, Gustavo F. Orozco O., Andre R. Barbosa, and Arijit Sinha. "CYCLIC TESTING AND NUMERICAL MODELING OF A THREE-STORY MASS-TIMBER BUILDING WITH A PIVOTING MASS PLY PANEL SPINE AND BUCKLING-RESTRAINED ENERGY DISSIPATORS." In World Conference on Timber Engineering 2023 (WCTE2023). As, Norway: World Conference on Timber Engineering (WCTE 2023), 2023. http://dx.doi.org/10.52202/069179-0286.

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Cavallini, Alberto, Simone Mancin, Luisa Rossetto, and Claudio Zilio. "Porosity Effects on Thermal Behaviour of 10 PPI Aluminum Foam." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88467.

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Electronic cooling challenge is focused on the high heat flux to be dissipated by the operating fluid. Efficient heat spreaders and dissipators, and compact heat exchangers are in great demand for various applications. In the last decade, cellular structure materials and particularly open cells metal foams have been proposed as possible substitutes for traditional finned surfaces. Several authors have experimentally investigated the thermal performance of different metal foams and periodic heat transfer media. Metal foams present random microstructures that consist in open cells randomly oriented and mostly homogeneous in size and shape. Most commercially available metal foams are based on aluminum, copper, nickel and metal alloys. This paper presents the porosity effects on the thermal behaviour of different 10 PPI (pores per inch) metal foams tested in the experimental facility built at the Dept. of Fisica Tecnica of the University of Padova. In particular, the data points have been collected by varying independently the mass flow rate and the heat flow rate. The measured experimental heat transfer coefficients and the pressure drops for three metal foams with different porosity are compared.

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