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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

Pivot point independent, external cavity tunable laser

Rees-Whippey, Daniel January 2016 (has links)
An investigation in to a novel pivot point free external cavity tunable laser (PPI ECTL). Existing external cavity tunable lasers are constructed using tunable optics, such as Bragg gratings to manipulate the cavity length. These elements although functional provide instability with prolonged use as they are defined by a centre of rotation or pivot point. The aim of this research was to provide a lab demonstrator of a new concept tunable laser based on conventional designs. The novel approach to the system design was in the removal of a defined pivot point, whilst still maintaining a moving optical component. The demonstration system will investigate the improvements upon traditional methods of tuning whilst providing greater tuning range and stability. The main defect of conventional systems was the reliance on the defined pivot point of the movable optics. By changing the position of the pivot point, the cavity length will change and the laser mode will change or hop to a side mode. This was known as a mode hop. The objective of the research was to design and implement a durable ECTL with a large tuning range (>200GHz), mode hop free tuning, fibre coupled, circular output beam and a wavelength in the visible. Design and production of a prototype PPI ECT laser that demonstrate the process of mode hop free tuning without the need of a defined pivot point. The impact of the research may lead in to the integration in to lower cost and more reliable commercial applications.
2

Otočný zvedací stůl vyšší nosnosti / Rotary lifting table with higher load capacity

Nytra, Tomáš January 2021 (has links)
This Master thesis deals with construction design of pop-up turntable with load capacity 120 tons and 1500 mm stroke. The driveline will supply by combination of hydromotor and planetary gearbox.The first part of this thesis deals with research in the field of current offer of pop-up turntables and construction elements used in pop-up turntables.Then is acceded to design of 3 different construction variants, of which is chosen one based on evaluation properties of each variant. After this part, follows on constuction design of chosen variant, including both desinging and calculating part. Part of the thesis is also required technical drawing documentation.
3

3D-Bodycanning: A market research based approach for rotary table selection

Schack, Tobias, Böös, Ludvig January 2017 (has links)
This report provides a recommendation for the purchase of a rotary table intendedmainly for 3D body scanning. This recommendation is presented to FabLab,Halmstad University. The proposal is based on the needs and requirements discussed and defined among group members, clients and other stakeholders. The main requirement is that the product can be programmed and controlled by acomputer. This requirement was strengthened through the execution of a pairwise comparison. A broad market research is described and methods that have been used to achieve the results. In order to better understand how much the load will affect the product, a force measurement test was performed and analyzed. Earlier reports about reverse engineering, different applications and scanning techniques provide a deeper understanding of factors that may affect the selection of the product.
4

Návrh otočného stolu CES 200 s hydrostatickým uložením / Design of CES 200 turntable with hydrostatic bearing

Záviška, Petr January 2012 (has links)
This diploma deals is occupied with design of the heavy rotary table with hydrostatic bearing of table. In introductory part of deals the design part are described, for exampel. tipes of bearings, drive and etc. In other parts the design of rotary table with hydrostatic bearings is described.
5

Konstrukce koncového testovacího zařízení elektromagnetu / The construction of electromagnet testing device

Vlasák, František January 2016 (has links)
Master thesis describes a single-purpose machine design, that is used for testing a basic features of proportional solenoid. The design is created in cooperation with company NUVIA a.s. and contains mechanical solution that is processed in respect with ergonomic requirements, safety and overall costs. Machine concept is affected by customer requirements, whose name, as well as real parameters of the product will not be published, because of non-disclosure agreement.
6

Development of a flexible turntable for storage of subsea cable : A Systems Engineering approach

Isac, Andersson January 2022 (has links)
Infrastructure for electricity and telecommunication, such as subsea cables, are critical in modern society. Future estimates also indicate an increased demand. Subsea cables enable the use of offshore wind power farms, transnational energy distribution and global data transfer. It is therefore considered important for a continuous development toward a sustainable future. Consistently, long and seamless cables, with complex inner structure, are requested. This makes the manufacturing and recurrent storing process challenging. Present cable storage systems, namely carousels, are a vital part of the manufacturing.  In this case study, a present manufacturing system of subsea cables was presented, whereby a possible improvement for a more flexible manufacturing process was suggested. The work focused on developing a new turntable, which is a subsystem, within the main system, the carousel. A Systems Engineering approach was used in order to develop the manufacturing system. This development resulted in three conceptual turntable solutions with improved flexibility and resource efficiency. The solutions generated consist of a turntable with two independently rotatable compartments. Although the focus of this case study was to develop a solution toward the subsea power cable industry, it is possible to up- or downscale depending on the required weight capacity, area and number of compartments.
7

Rotační manipulátor pro ruční svařování bubnů zakladače EXYZ / Rotary manipulator for manual welding of hoist drums for EXYZ storage machine

Pečenka, Tomáš January 2017 (has links)
The main aim of this diploma thesis is to design rotary manipulator for manual welding of hoist drums for EXYZ storage machine. The rotary manipulator is designed for improving of the quality of welds, which have been made in the static bearing welding process of hoist drum. The first part is concerned on the critical research of welding manipulators, which could be founded on the market. In the next part, there are sketched possible construction designs of welding manipulator based on the market offer. The main part of the diploma thesis is own construction design, which is made on the base of suggested concept of construction design.
8

Kolmá křížení tramvajových tratí s vlečkami / Perpendicular crossings tram tracks with railway sidings

Omaník, David January 2018 (has links)
The diploma thesis deals with the perpendicular crossing of tram track with railway siding. The structure of crossing is described both in the Czech Republic and in the world. The aim of the thesis is to find the recommended design solution for the crossing of tram and railway tracks with regard to legislation and feasibility. After a comparison of the existing structures is chosen which satisfies the conditions of feasibility.
9

Návrh robotické buňky pro svařování s více roboty / Robotic cell design for coordinated robotic welding

Dvořák, Jaroslav January 2010 (has links)
The aim of this thesis is to design a robotic cell with two welding robots and rotary table in two designs and to compare different types of control. These designed alternatives evaluate possibly using of its parts. These designed variants compare physically and financially.
10

Otočný zvedací stůl QHZ 20 / QHZ 20 lifting turntable

Bursík, Miroslav January 2011 (has links)
This master’s thesis deals with the design of the new concept of lifting turntable QHZ 20. The main objective is to reduce the installation depth of table. Part of thesis is background research of individual components of the forging complex with hydraulic press CKW 25. It describes the current structure QHZ table, comparing the advantages and disadvantages of possible solutions of the table. The work also includes design, description and calculation of the chosen solution.

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