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Concept

Char d'assaut

Le char d'assaut (en anglais : tank, en allemand : Panzer) est un système d'arme mobile constitué d'un canon monté sur un véhicule automobile blindé et le plus souvent chenillé (il existe également des chars légers à roues) permettant à la fois d'évoluer sous protection et de tirer. Description schématisée thumb|redresse=2.5|Schéma légendé d'un char.

Viseur du tireur/opérateur tourelle

Masque du canon

Mitrailleuse coaxiale

Évacuateur de fumée

Canon

Épiscopes

Volet d'accès au compartiment de conduite

Glacis

Chenille

Boîte à munition de la mitrailleuse

Mitrailleuse du chef de char

Volet du tourelleau

Tourelle

Interface tourelle-châssis

Caisse ou châssis

Prise d'air du moteur

Déport de caisse

Jupe latérale

Barbotin

Patin de chenille

Galet de roulement

Origine du terme tank Quelques mois après le début de la Première Guerre mondiale, en octobre 1914, le colonel Ernest Dunlop Swinton de la British Army, un tacticien m

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Publications associées (20)

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Personnes associées (2)

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Unités associées (1)

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Concepts associés (42)

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Cours associés (42)

Cours associés

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Séances de cours associées (72)

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PHYS-105: Advanced physics II (thermodynamics)

Ce cours présente la thermodynamique en tant que théorie permettant une description d'un grand nombre de phénomènes importants en physique, chimie et ingéniere, et d'effets de transport. Une introduction à la physique statistique renforce les notions acquises grâce à une modélisation microscopique.

MSE-101(a): Materials:from chemistry to properties

Ce cours permet l'acquisition des notions essentielles relatives à la structure de la matière, aux équilibres et à la réactivité chimique en liaison avec les propriétés mécaniques, thermiques, électriques et magnétiques des matériaux.

ENV-405: Water and wastewater treatment

This course on water and wastewater treatment shows how to implement and design different methods and techniques to eliminate organic matter, nitrogen and phosporous from wastewater, and how to apply physical and chemical methods and techniques to produce drinking water.

Uplift mechanics of unanchored liquid storage tanks subjected to lateral earthquake loading

Konstantinos Bakalis

Motivated by the seismic response of unanchored liquid storage tanks, their uplift mechanism under strong lateral loading is examined. Using three-dimensional finite element models, nonlinear static analysis is conducted to define the moment-rotation relationship of uplifting tanks resting on rigid foundation and describe the evolution of critical response parameters with increasing level of lateral loading. Meridional and hoop stress, as well as their distribution and evolution with increased uplift are computed. Comparing the numerical results with the corresponding results from anchored tanks, striking differences are observed on the values of compressive meridional stresses and their distribution around the tank circumference. Cyclic analysis, associated with repeated uplift at both sides of the tank, is also performed, to obtain the corresponding hysteretic response and verify the assumption of nonlinear-elastic tank behaviour, used in several previous works. Finally, an analytical solution is developed, capable of describing tank uplift in an efficient manner. The analytical solution accounts for the special features of uplift, obtained from the finite element solution, and can be used for simple and reliable assessment of seismic performance in unanchored liquid storage tanks.

ELSEVIER SCI LTD2021

Chargement

Gondo Throttled Surge Tank Numerical Modeling and Design Review

Mona Seyfeddine

In order to increase the installed capacity, the refurbishment of Gondo high-head power plant required a modification of the existing surge tank by installing a throttle at its entrance. In a previous study, the geometry of this throttle was optimized by physical modeling to achieve the target loss coefficients as identified by a transient 1D numerical analysis. This study complements previous analyses through 3D numerical modeling using the commercial software ANSYS-CFX 19 R1. Results show that: (i) a 3D CFD model predicts sufficiently accurate local head loss coefficients that agree closely with the findings of the physical model; (ii) in contrast to a standard surge tank, the presence of a connecting gallery proved to be of insignificant effect on a surge tank equipped with a throttle, as the variations in the section of the tank cause negligible local losses compared to the ones induced by the throttle; (iii) CFD investigations of transient flow regimes revealed that the head loss coefficient of the throttle only varies for flow ratios below 20% of the total flow in the system, without significantly affecting the conclusions of the 1D transient analysis concerning minimum and maximum water level in the surge tank as well as pressure peaks below the surge tank. This study highlights the importance of examining the characteristics of a hydraulic system from a holistic approach involving hybrid modeling (1D, 3D numerical and physical) backed by calibration as well as validation with in-situ measurements. This results in a more comprehensive design of throttled surge tanks that makes full use of the advantages associated with each modeling strategy.

2020

Chargement

Experimental Determination of the Capacity of Wall-to-Base Connections in Storage Tanks

Gustavo Cortes, Eric Lattion, Alain Nussbaumer

Earthquakes around the world have affected many unanchored tanks used for storage of gasoline. When these unanchored tanks are subjected to strong motion, the moment generated at the base, by the mass of liquid contained in the tank, will cause partial uplift of the base (i.e. rocking of the tank), inducing cycles of rotation at the wall-to-base connection. Actual codes of standard practice used in Europe and New Zealand limit the rotation that may be allowed at this connection to 0.2 radians. This limit was based on a series of assumptions since no realistic tests had been conducted. This paper presents the experimental research conducted to determine the real rotational capacity of these connections. The tests were carried out considering the bending stresses and the membrane stresses that develop at the base plate when uplift occurs. Specimens from an old existing tank (dismantled) were used. New specimens were also fabricated and used to allow for a more comprehensive study. Results from this research are presented in the form of plots of maximum rotation vs. number of cycles to failure, called RN curves. These curves revealed that the current Eurocode limit of 0.2 radians is overly conservative. Based on the limited data, a limit of 0.4 radians would be more realistic.

Elsevier2011

Chargement

Seconde Guerre mondiale

La Seconde Guerre mondiale, ou Deuxième Guerre mondiale, est un conflit armé à l'échelle planétaire qui dure du au . Ce conflit oppose schématiquement les Alliés et l'Axe. Provoquée par le règleme

Guerre de tranchées

thumb|250px|Deux cadavres de soldats allemands gisant dans une tranchée, peints par William Orpen en 1917. La guerre de tranchées est une forme de guerre où les combattants s'abritent dans des lignes

Première Guerre mondiale

Infobox Conflit militaire | image = WWImontage.jpg | taille image = 280 | légende = Dans le sens des aiguilles d'une montre : des tranchées abandonnées, des chars Mark V de l'