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Browsing by Issue Date, starting with "2015-11-19"

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  • Ilustrada - Jornada de Ilustração
    Publication . Leite, Cláudia Sofia Bravo; Moura, Catarina Isabel Grácio de
    Este relatório tem como propósito relatar as experiências, conhecimentos e resultados alcançados durante o projeto desenvolvido no âmbito do mestrado em Design Multimédia da Universidade da Beira Interior. Está estruturado em três partes específicas, mas intrinsecamente relacionadas. A primeira parte é essencialmente teórica, destinada a descrever e elucidar as diversas dimensões concetuais que permitem uma melhor compreensão do projeto, sua identidade e fundamentos. O Logótipo, a Tipografia, o Cartaz, o Folheto e o Web design são os elementos formais que constroem este projeto de identidade visual para um evento sobre ilustração chamado ILUSTRADA. Esta parte inclui igualmente o trabalho de pesquisa e listagem de um conjunto de eventos congéneres contemporâneos à ILUSTRADA e uma breve análise aos mesmos. A segunda parte está destinada à ilustração. Começa-se por contextualizar a sua história, não esquecendo a sua relação com a história do design. Posteriormente, prosseguimos com uma noção mais precisa da ligação existente entre estas duas áreas: o design e a ilustração. Relata-se a experiência e a escolha concetual da criação das ilustrações para a ILUSTRADA, descrevendo e explicando as referências invocadas para as realizar. A terceira e última parte é dedicada à dimensão mais prática do projeto, permitindo a visualização dos materiais finais, bem como a percepção do seu potencial desempenho nos ambientes para os quais foram planeados.
    2015-11-19Master thesis Open access Show more
  • Internal Structure of Hybrid Airships Airship Design and Structural Analyses
    Publication . Santos, Tiago Rodrigues dos; Gamboa, Pedro Vieira; Silva, Jorge Miguel dos Reis
    Nowadays, the research on airships has been declining over the years but the evolution of technology allows the possibility to think in new concepts such as hybrid airship. It provides better efficiency in all aspects, and it is possible to use innovative and effective internal structures with new materials that did not exist in older times. The internal structure depends on the type of the airship, and many of them have problems due to weight or control and stability. The rigid airships are heavy but with the new technology can have material much lighter and durable. The internal structure is similar to the internal structures of wings, having frames and girders. To know which kind of structure to use, it were studied various types of possible structure for a hybrid airship prototype and the most effective currently are trusses, despite there are possibilities to start to use sandwich structures in a possible future. The trusses have problems and because of that were analyzed different heights and angles taking into account the study from trusses used in other airships. Experimental tests were realized to prove the concept of the structure as well as the stiffness of the structure. In order to make a better study about airships and all their structural problems, it was made 4 prototypes and the start of the study of the hybrid airship internal structure. The Prototypes 1 and 1.5 are quite similar in some structure aspects where it was identified the structural problems as well as the influences of material stiffness and difficulties to fix the material to non-rigid airship. The Prototype 2 and 2.5 was analyzed some problems because the force created by the rotor wherein the internal structure will be subject to high moments in areas where it is placed the rotors and wings. The study of the internal structure is the start of the construction of the final prototype with rigid internal structure which will include the control and stability system of the prototype 1.5 and 2.5, called Prototype 3. This study will allow knowing the weakest points and the difficulty to assemble the internal structure of the Prototype 3. It concludes that it is possible to make an internal structure with the aerodynamic shape desired having a high rigidity and low weight.
    2015-11-19Master thesis Open access Show more
  • Manufacturing Techniques of a Hybrid Airship Prototype
    Publication . Claro, Sara Emília Cruz; Silva, Jorge Miguel dos Reis; Gamboa, Pedro Vieira
    Nowadays we witness a growing demand for alternative means of transportation. This interest stems from the rising price of fossil fuels, due to its scarcity, environmental pollution beyond the congestion of infrastructures. An alternative is the use of hybrid airships, which may fill the gaps mentioned above of the transport commonly used today. Therefore, the study of this technology has been increasingly extensive throughout the world. Thus, the objective of this dissertation aims, essentially, the manufacture planning of a Prototype’s structure and gasbags of a hybrid airship with a new concept of stability and control. Before the construction of this Prototype, there was a need to do concept tests in smaller prototypes. Thus, a PVC blimp was adapted for these tests, and for these adaptation was given the name prototypes too. The first two of them (1 and 1.5) had the objective of testing the stability and control of all surfaces and the last (2.5) to test the performance of a quad-rotor airship with fixed pitch control. After these tests had been completed, the next step was the construction of a section of the structure of the final prototype, called Prototype 3, with approximately 9 meters. Initial project requirements, decided that the development of this component would have to be done by hand, thus was essential a study of the best way to conceive, in order to save time and increase the build quality of the complete structure. Likewise, it was necessary to study the best gasbags materials and construction, so that they have the best performance in helium retention.
    2015-11-19Master thesis Open access Show more
  • Fuel Conservation Strategies for the Vertical Profile of Cruise Flight
    Publication . Nunes, Henrique de Sousa Faria Amaral; Silva, Jorge Miguel dos Reis
    Fuel conservation strategies are used by airlines with the objective of making their operations more efficient, whether it is from an economical or environmental point of view. This dissertation focuses only on the vertical profile of the cruise phase of long haul commercial flights. Covering legislation, operational standards, communications, surveillance, flight planning and performance aspects. After a description of the previous aspects, the first case study is presented. This case study consists in a comparison between a usual vertical profile of a flight and an optimized one. First a theoretical estimation of the results is presented and then the detailed calculations for the actual flight are described, continuing with an explanation of several factors associated with the results. A summary of a second case study is presented to allow for a comparison between two vertical profile optimization procedures.
    2015-11-19Master thesis Open access Show more