• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 3
  • Tagged with
  • 4
  • 4
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 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

Assembly Analysis - Fixed Leading Edge for Airbus A320

Gunnarsson, Linus, Bitar, Nadim January 2010 (has links)
The objective with this thesis project was to with the simulations software Delmia make a working build philosophy for the new concept of the fixed leading edge for the Airbus A320 airliner, but also to make two conceptual fixtures in the modular framework BoxJoint for pre-drilling of two sub assemblies.   Everything started with a study in Delmia to both recap on previous knowledge and to learn more about it. This was followed by early simulations on the new concepts that were provided by project partners. Then a study was made in the Affordable Reconfigurable tooling, ART-concept. A suggested build philosophy was created and possible areas for automation were identified. These areas were all the drilling and fettling operations except the drilling in the last stage where the pre-drilled holes are opened up. More investigations needs to be done to see if a robot can install and remove slave pins that are used in the last stage. Two conceptual designs on fixtures were created where one uses two industrial robots with vision systems to get the correct accuracy when drilling the product. The other was build to be able to use a Tau-Gantry robot solution together with a vision system.
2

Assembly Analysis - Fixed Leading Edge for Airbus A320

Gunnarsson, Linus, Bitar, Nadim January 2010 (has links)
<p>The objective with this thesis project was to with the simulations software Delmia make a working build philosophy for the new concept of the fixed leading edge for the Airbus A320 airliner, but also to make two conceptual fixtures in the modular framework BoxJoint for pre-drilling of two sub assemblies.</p><p> </p><p>Everything started with a study in Delmia to both recap on previous knowledge and to learn more about it. This was followed by early simulations on the new concepts that were provided by project partners. Then a study was made in the Affordable Reconfigurable tooling, ART-concept. A suggested build philosophy was created and possible areas for automation were identified. These areas were all the drilling and fettling operations except the drilling in the last stage where the pre-drilled holes are opened up. More investigations needs to be done to see if a robot can install and remove slave pins that are used in the last stage. Two conceptual designs on fixtures were created where one uses two industrial robots with vision systems to get the correct accuracy when drilling the product. The other was build to be able to use a Tau-Gantry robot solution together with a vision system.</p>
3

Feature based design for jigless assembly

Naing, Soe January 2004 (has links)
The work presented in this thesis was undertaken as part of the three-year ‘Jigless Aerospace Manufacture’ (JAM) project which was set-up to investigate and address the significant scientific, technological and economic issues to enable a new design, manufacture and assembly philosophy based on minimising product specific jigs, fixtures and tooling. The main goal of the JAM project at Cranfield was the development of appropriate jigless methods and principles, and the subsequent redesign of the JAM project demonstrator structure – a section of the Airbus A320 aircraft Fixed Leading Edge – to fully investigate and realise the capabilities of jigless methodologies and principles. The particular focus of research activity described in this thesis was the development of a methodology to design for jigless assembly and a process of selecting assembly features to enable jigless assembly. A review of the literature has shown that no methodologies exist to specifically design for jigless assembly; however, previous relevant research has been built upon and extended with the incorporation of novel tools and techniques. To facilitate the assembly feature selection process for jigless assembly, an Assembly Feature Library was created that broadened and expanded the conventional definition and use of assembly features. The developed methodology, assembly feature selection process and Feature Library have been applied and validated on the JAM project demonstrator structure to serve as a Case Study for the tools and techniques developed by the research. Additionally, a Costing Analysis was carried out which suggests that the use of the tools and techniques to enable jigless assembly could have a large and considerable impact on both the Non-Recurring and Recurring costs associated with the design, manufacture and assembly of aircraft.
4

Basic Comparison of Three Aircraft Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion

Rodrigo, Clinton January 2019 (has links) (PDF)
Purpose - This thesis presents a comparison of aircraft design concepts to identify the superior propulsion system model among turbo-hydraulic, turbo-electric and classic jet propulsion with respect to Direct Operating Costs (DOC), environmental impact and fuel burn. --- Approach - A simple aircraft model was designed based on the Top-Level Aircraft Requirements of the Airbus A320 passenger aircraft, and novel engine concepts were integrated to establish new models. Numerous types of propulsion system configurations were created by varying the type of gas turbine engine and number of propulsors. --- Findings - After an elaborate comparison of the aforementioned concepts, the all turbo-hydraulic propulsion system is found to be superior to the all turbo-electric propulsion system. A new propulsion system concept was developed by combining the thrust of a turbofan engine and utilizing the power produced by the turbo-hydraulic propulsion system that is delivered via propellers. The new partial turbo-hydraulic propulsion concept in which 20% of the total cruise power is coming from the (hydraulic driven) propellers is even more efficient than an all turbo-hydraulic concept in terms of DOC, environmental impact and fuel burn. --- Research Limitations - The aircraft were modelled with a spreadsheet based on handbook methods and relevant statistics. The investigation was done only for one type of reference aircraft and one route. A detailed analysis with a greater number of reference aircraft and types of routes could lead to other results. --- Practical Implications - With the provided spreadsheet, the DOC and environmental impact can be approximated for any commercial reference aircraft combined with the aforementioned propulsion system concepts. --- Social Implications - Based on the results of this thesis, the public will be able to discuss the demerits of otherwise highly lauded electric propulsion concepts. --- Value - To evaluate the viability of the hydraulic propulsion systems for passenger aircraft using simple mass models and aircraft design concept.

Page generated in 0.0342 seconds