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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

Geležinkelio vėžės geometrinių parametrų įtaka bėgių ilgaamžiškumui kreivėse / Influence of geometrical parameters of railway gauge upon rail durability on curves

Povilaitienė, Inesa 07 July 2004 (has links)
The aim of the research is to analyse the impact of geometrical parameters of gauge and displacement upon rail head side wearing on curves and present proposals to increase durability of rails on curves.
2

Miesto viešojo transporto maršrutinio tinklo modeliavimas ir plėtra (Vilniaus miesto pavyzdžiu) / Modelling and development of town public transport network (on example of Vilnius city)

Ušpalytė-Vitkūnienė, Rasa 02 November 2006 (has links)
The aim of this paper is to guarantee improved quality of life for inhabitants by modelling the network of public transport routes in Vilnius. To achieve the aim of the paper, the following tasks were formulated: • analysis of measures of modelling the public transport passenger flows, as well as analysis their function, • establish the main criteria of the public transport’s modelling in Vilnius, • modelling of the public transport route networks in accordance with the established criteria, • assessment of the influence of speedy trams on the distribution of passenger flows within the public transport of Vilnius, • proposals on the possibilities of application of the public transport modelling criteria for other Lithuanian towns.
3

Miesto viešojo transporto maršrutinio tinklo modeliavimas ir plėtra (Vilniaus miesto pavyzdžiu) / Modelling and development of town public transport network (on example of Vilnius city)

Ušpalytė -Vitkūnienė, Rasa 03 November 2006 (has links)
The aim of this paper is to guarantee improved quality of life for inhabitants by modelling the network of public transport routes in Vilnius. To achieve the aim of the paper, the following tasks were formulated: • analysis of measures of modelling the public transport passenger flows, as well as analysis their function, • establish the main criteria of the public transport’s modelling in Vilnius, • modelling of the public transport route networks in accordance with the established criteria, • assessment of the influence of speedy trams on the distribution of passenger flows within the public transport of Vilnius, • proposals on the possibilities of application of the public transport modelling criteria for other Lithuanian towns.
4

SLENKSTINĖS BETONINĖS GRAVITACINĖS UŽTVANKOS PROJEKTAVIMO AUTOMATIZAVIMAS CAD PROGRAMŲ PAGRINDU / The automation of concrete gravitation spillway dam’s on basis of CAD programs

Ugianskis, Domas 17 May 2006 (has links)
The thesis is presenting and considerating CAD programs, that can help to project hydrotechnique pales. The thesis is analyzing spillway concrete gravitation dam (SCGD) on the ground substructure, spillway design automation, calculations of stresses under spillway and spillway stability. This work supposes two CAD programs – AutoCad and MathCad - to automate spillway design. Manually mould and draw the spillway profile take a lot of time. Spillway is the main part of the SCGD, so it must be done high precision. There are all automate stages of spillway profile in this article. All automate stages are programming in MathCad program. All results from MathCad program are transporting to AutoCad program. All results are transporting with help of AutoLISP.AutoCad program can draw spillway profile, set its area, center of gravity. All these parameters are using to calculate the stability of spillway. The thesis consist of 4 chapters, conclusions and references. It covers 50 pages without appendixes, 5 tables and 22 pictures are included. Number of references – 25. There are 3 appendixes in the end of thesis.
5

Laiptų ir pandusų, esančių pastatų išorėje, ergonominis tyrimas / Ergonomical analysis of the staircases and ramps in the buildings outdoors

Marčiulaitytė, Lina 20 June 2006 (has links)
The aim of this finishing work is carry out ergonomical analysis of stairs and ramps in the buildings outside. Performing analysis it was taken measurements of these elements similarly comparing them with measurements given in the Standard documents. The aim of this work is to evaluate as buildings admissions are fitted for people comfortable using them and offer conclusions and suggestions. In this work is analyzing material giving in the standards furthermore stairs and ramps fitting for peoples with wheelchairs.
6

3D kompiuterinio modeliavimo panaudojimas statyboje / Application of 3D computer–aided modelling in construction

Sysas, Remigijus 22 June 2005 (has links)
With the increasing complexity of modern construction projects, there is a pressing need on higher degree of assistance from computer in order to accomplish effective planning and management. In this work three-dimensional computer modeling is analyzed, describing his and in disadvantages in comparison with two-dimensional modeling, and an opportunity application in designing construction. In this work the 3D computer – aided modeling and it’s the usage in construction are analyzed. As result’s the new attitude of building design and implementation are presented. The 3D computer – aided usage in all construction life cycles is made and advantages are given.
7

Tamprių-plastinių prisitaikančių sistemų optimizacija su standumo ir stabilumo sąlygomis / Optimization of elastic-plastic systems under stiffness and stability constraints at shakedown

Merkevičiūtė, Dovilė 23 December 2005 (has links)
Optimization problems (to which is dedicated this dissertation) of structural mechanics are introductory stage of structure optimum design based on principles of solid deformable body mechanics, mathematical programming theory, its methods and their mechanical interpretation. In order to base calculation on real operating conditions of structure, it is necessary evaluate as exact as possible structure material properties, external effects and other factors in mathematical models of optimization problems. Partially it is achieved by including plastic properties of material. Calculation and design of the structures, taking in to account plastic strains, allows to use their bearing capacity more efficiently and make more economic project (in this dissertation research is developed on the basis of perfect plasticity theory). From the other side, real effect for structure are often cyclic (variable repeated load character is also evaluated in this work). In the dissertation it is assumed that load is quasi–static and is characterised by load variation bounds (deterministic formulation of problems is considered). Under repeated loading a structure can lose its serviceability because of its progressive plastic failure or because of alternating strain (usually both cases are called cyclic–plastic collapse). But, if residual forces together with variable part that do not violate the admissible bounds appear in the initial stage of loading, the structure adapts to existing load and... [to full text]
8

Plieninių rėminių konstrukcijų pasiduodančių mazgų modeliavimo ir projektavimo metodų kūrimas / Development of methods of modelling and design of semi-rigid joints in steel frames

Urbonas, Kęstutis 02 March 2006 (has links)
The main parts of the framework are beams, columns and joints. Taking into account all structural members, the accurate behaviour of the joints is least considered in the design practice. This is the framework part, which behaviour is the most simplified. Framework calculations are still performed according to the assumption that joints are either ideally rigid or ideally pinned, in spite of the fact that majority of the joints is neither ideally rigid nor ideally pinned. The idealization of joints into ideally rigid or ideally pinned significantly simplifies the calculation and design, but herewith limits the possibility to obtain the real behaviour of the whole structure. Structural and economical benefit of using the semi-rigid joints is widely known. The real behaviour of the framework allows designing more proper and safer structures, herewith reaching the economical benefit. Incorrect idealization of the behaviour may lead to design of an uneconomical structure and decrease its safety. Recently, the topic of semi-rigid joints is increasingly investigated. Many investigations have been performed with different joints of steel frameworks. Majority of investigations have been performed, when the joints were under bending moment – the force that has the biggest influence on joint behaviour. Only particular types of joints that are mostly used in practice were investigated. Despite the progress in this area, usage of semi-rigid joints in design practise is still problematic... [to full text]
9

Plieninių rėminių konstrukcijų pasiduodančių mazgų modeliavimo ir projektavimo metodų kūrimas / Development of methods of modelling and design of semi-rigid joints in steel frames

Urbonas, Kęstutis 02 March 2006 (has links)
The main parts of the framework are beams, columns and joints. Taking into account all structural members, the accurate behaviour of the joints is least considered in the design practice. This is the framework part, which behaviour is the most simplified. Framework calculations are still performed according to the assumption that joints are either ideally rigid or ideally pinned, in spite of the fact that majority of the joints is neither ideally rigid nor ideally pinned. The idealization of joints into ideally rigid or ideally pinned significantly simplifies the calculation and design, but herewith limits the possibility to obtain the real behaviour of the whole structure. Structural and economical benefit of using the semi-rigid joints is widely known. The real behaviour of the framework allows designing more proper and safer structures, herewith reaching the economical benefit. Incorrect idealization of the behaviour may lead to design of an uneconomical structure and decrease its safety. Recently, the topic of semi-rigid joints is increasingly investigated. Many investigations have been performed with different joints of steel frameworks. Majority of investigations have been performed, when the joints were under bending moment – the force that has the biggest influence on joint behaviour. Only particular types of joints that are mostly used in practice were investigated. Despite the progress in this area, usage of semi-rigid joints in design practise is still problematic... [to full text]
10

Geležinkelio vėžės geometrinių parametrų įtaka bėgių ilgaamžiškumui kreivėse / Influence uf geometrical parameters of railway gauge upon rail durability on curves

Povilaitienė, Inesa 09 July 2004 (has links)
The aim of the research is to analyse the impact of geometrical parameters of gauge and displacement upon rail head side wearing on curves and present proposals to increase durability of rails on curves.

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