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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Dynamic analysis of floating quay and container ship for container loading and offloading operation

Kumar, Brajesh 12 April 2006 (has links)
A floating quay container terminal is used for loading or unloading from container ships from both sides of a floating quay. The side-by-side Liquefied Natural Gas (LNG) offloading operation from floating terminals to LNG carriers is very similar to that from super-container ships to floating quay-walls. The hydrodynamic interaction effects among a fixed quay, container ship and floating quay, which are parallel to one another, are investigated. The three body side-by-side arrangement is compared with the individual freely floating body in the absence/presence of the fixed quay to identify the interaction effects. Hydrodynamic coefficients of the interacting bodies are obtained using a three dimensional constant panel method, WAMIT. Using a vessel-lines coupled dynamic analysis computer program WINPOST, the relative motion between floating quay and container ship is simulated in time domain. It is assumed in the present study that the floating quay is positioned by a dolphin mooring system. This analysis provides the relative motion among container ship, fixed and floating quay to ascertain that container loading and offloading can be performed in the severe wave condition without any problem.
2

To Move an Obelisk / Att flytta en obelisk

Jansson, Wilhelm January 2019 (has links)
Today, there are more Egyptian obelisks outside of Egypt than there are left where they were made. The obelisks are certainly beautiful, but what lies beneath are uncountable hours, days and years of work. Work which made the obelisks end up where they are today. From quarrying these enormous pieces of stone by smashing rock against rock, to building ships without equal for their transportation. It is hard to understand the amount of resources, manpower and organization that went into creating these tall monuments. Therefore, this study will attempt to examine each step in transporting the obelisks, from the quarry to their destination. Where theories collide, the study will weigh them against each other critically to give a fuller account of the transportation of the obelisks of Egypt. This study will begin by presenting a background, or basis, which will be further built upon as it progresses. The first chapter is mainly focused around the circumstance of transportation, along with giving a basic description of obelisks as individual objects. The next step lies in studying the general shipbuilding techniques used in ancient Egypt. This in turn will help in understanding the obelisk ships and the loading and unloading of these vessels. The obelisk ships and their loading will be the focal point of this study. The mainstay of the sources used for this study comes from earlier theories. The primary sources of this study will mainly consist of textual remains along with depictions. / Idag finns det fler obelisker utanför Egypten än vad det finns kvar innanför dess gränser. Obeliskerna är helt klart vackra, men vad som ligger under ytan är oräkneliga timmar, dagar och år av arbete. Arbete som gjorde att obeliskerna hamnade på den plats de är idag. Från att bryta dessa enorma stenblock genom att slå sten mot sten, till att bygga skepp utan dess like för deras transport. Det är svårt att förstå den enorma mängd resurser, arbetskraft och ren vilja som krävdes för att skapa dessa höga monument. Av denna anledning kommer den här studien att försöka närma sig varje steg i transporten av obelisker, från stenbrottet till deras destination. Där teorier kolliderar, kommer denna studie att väga dem mot varandra kritiskt för att ge en mer komplett inblick i transporten av antika Egyptiska obelisker. Denna studie kommer att börja med att presentera en bakgrund, eller bas, som kommer att byggas vidare på under arbetets gång. Studiens första del fokuserar  på omständigheterna för transporten, samt med att ge en grundläggande beskrivning av obelisker som individuella objekt. Det nästkommande steget ligger i att studera de tekniker som användes för skeppsbygge i det antika Egypten. Detta kommer i sin tur underlätta för förståelsen av obeliskskepp och avlastning samt pålastning av dessa farkoster. Obeliskskeppen och deras lastning kommer att utgöra huvuddelen i denna studie. Huvuddelen av källorna som använts för denna studie kommer från tidigare teorier. Primärkällorna som använts består till största del av textuella lämningar samt avbildningar.
3

Analýza manipulačních prostředků a zařízení pro realizaci ložných operací v zemědělství / Analysis of handling equipment and device for realization of loading operations in agriculture

ŠAFRÁNKOVÁ, Eva January 2014 (has links)
The target of thesis is to analyze handling equipment and device for realization of loading operations in agriculture and provide proposals and principles for optimal usage of applied handling equipment and device. The characteristics and clasifications of materials in agriculture, loading operations and transportation, listing of applied handling equipment and device for realization of such processes are stated in literary survey of this work. Next part of the work focuses on selection of modern handling equipment, device and producers ( domestic and international) available at current market and defines factors influencing the prefered choice to use particular handling equipment and device for loading processes on farms and in other agricultural environment. A part of the analysis is data and information acquisition of particular farm and review of loading processes in agriculture connected to applicable handling equipment and device, furthermore, currently used handling equipment and device with proposal to optimalization.
4

Mechanical behaviour of compacted earth with respect to relative humidity and clay content : experimental study and constitutive modelling / Comportement mécanique de la terre compactée par rapport à l'humidité relative et à la teneur en argile : étude expérimentale et modélisation constitutive

Xu, Longfei 04 July 2018 (has links)
La terre compactée est considérée comme un mélange granulaire dans lequel l'argile joue un rôle de liant mais cette dernière exhibe une forte interaction avec l'eau. Pendant la durée de vie en service, la terre compactée est soumise aux changements de l’humidité relative. En raison de ces changements des conditions ambiantes perpétuels, la teneur en eau dans la terre varie, impactant leur performance mécanique. Le présent travail a ainsi pour but d’étudier l’impact de l’humidité relative et de la teneur d'argile sur le comportement mécanique de la terre compactée. Il se réalisera au travers d’études expérimentales et d'une modélisation constitutive. Dans la première partie de cette thèse, quatre terres régionales de provenances et de teneurs d'argile différentes sont identifiées. Une étude comparative a été réalisée entre le double compactage statique et le compactage dynamique. En parallèle, trois types d'essais spécifiques : essais de succion par la méthode de papier-filtre, essais de retrait et essais d'absorption d'eau, ont été menés pour donner des indications préliminaires quant aux effets d'interaction entre l'eau et l'argile. Dans la deuxième partie, l’impact de l’humidité relative et de la teneur d'argile sur le comportement de cisaillement a été étudié, prenant en compte des cycles de chargement-déchargement. En adoptant une définition particulière de la contrainte effective de Bishop, il a également été observé que les états de rupture dans le plan (p'-q) pour tous les échantillons sont alignés approximativement à une ligne droite unique passant par l'origine, quelque soit la succion et la pression de confinement. Sur la base des résultats expérimentaux, un nouveau modèle constitutif a été développé pour la simulation du comportement mécanique de la terre compactée. Ce nouveau modèle a ainsi été formulé dans la cadre de la mécanique de l'endommagement des milieux continus et de la théorie de Bounding Surface Plasticity. / Compacted earth is regarded as a granular mixture in which clay plays a role of binder but it also exhibits an important interaction with water. During their service life, compacted earth can be subject to large changes in relative humidity. Those perpetual changes of environmental conditions induce continuous changes of water content of the earth that impact significantly its mechanical performances. The present work aimes at studying the mechanical behavior of compacted earth with respect to relative humidity and clay content. It involves an extensive experimental study and a constitutive modelling. In the first part of this thesis, four kinds of local earth are identified with different clay contents. A comparison of compaction method was then conducted between a double static compaction and dynamic compaction. Three types of specific tests: suction test by filter paper method, shrinkage test and sorption-desorption test were carried out, thereby providing a preliminary insight on the interaction effects between clay and water. In the second part, the impact of clay and moisture contents on the shear behavior of compacted earth was investigated taking into account loading-unloading cycles. Adopting a particular definition of Bishop's effective stress, failure states of all samples were observed to lie approximately on a unique failure line crossing the origin in the (p'-q) plane regardless of matric suction and confining pressure. Finally, based on the above experimental results, a new constitutive model was proposed, based on the theories of Bounding Surface Plasticity and continuum damage mechanics, aiming to simulate mechanical behaviour of compacted earth.

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