2011
Autores
Rodrigues, RB; Mendes, VMF; Catalão, JPS;
Publicação
Proceedings of EUROCON 2011, International Conference on Computer as a Tool, 27-29 April 2011, Lisbon, Portugal
Abstract
This paper is concerned with direct lightning surge analysis in wind turbines. Portugal has one of the most ambitious goals in terms of wind power, and in 2006 was the second country in Europe with the highest wind power growth. Nevertheless, there are still very few studies in Portugal regarding lightning protection of wind turbines using the electromagnetic transients computer program, namely the most recent and restructured version EMTP-RV. A case study is presented in this paper, based on a wind turbine with an interconnecting transformer, for the analysis of direct lightning surges. Computer simulations obtained by using EMTP-RV software are presented. These computer simulations can be easily customized for parameters characterizing wind turbines or other countries. Finally, conclusions are duly drawn. © 2011 IEEE.
2011
Autores
Patrão, AL; Vasconcelos-Raposo, J;
Publicação
cea - Cadernos de Estudos Africanos
Abstract
2011
Autores
Jacobs, B; Niqui, M; Rutten, J; Silva, A;
Publicação
Theoretical Computer Science
Abstract
2011
Autores
Van Assche, K; Escudeiro, N; Escudeiro, P; Dispert, H;
Publicação
Multinational Undergraduate Team Work: Excellence in International Capstone Projects
Abstract
We believe that a set of tools and curricular activities involving students from different countries, collaborating to complete projects that generate relevant outputs to the community, might improve both students' enthusiasm and their team work and communication skills. That is the mission of the Multinational Undergraduate Team Work project (MUTW). The MUTW methodology is devoted to create and manage future international teams of students who will collaborate in order to develop a solution for a given engineering problem. The methodology encompasses all the timeframe of an edition of MUTW, including preparation of the students' project and its deployment by the teams ofstudents.
2011
Autores
Cabo, M; Pereira, T; Fonseca, B; Paredes, H;
Publicação
ASSETS 11: PROCEEDINGS OF THE 13TH INTERNATIONAL ACM SIGACCESS CONFERENCE ON COMPUTERS AND ACCESSIBILITY
Abstract
In this demo, we present an application for mobile phones, which can allow communication between deaf and emergency medical services using an iconographic touch interface. This application can be useful especially for deaf but also for persons without disabilities that face sudden situations where speech is hard to articulate.
2011
Autores
Ferreira, I; Cabral, JA; Saraiva, P;
Publicação
Injection Molding: Process, Design, and Applications
Abstract
The injection mold is a high precision tool responsible for the production of most plastic parts used everywhere. Its design is considered critically important for the quality of the product and efficient processing, as well as determinant for the economics of the entire injection molding process. However, typically, no formal engineering analysis is carried out during the mold design stage. In fact, traditionally, designers rely on their skills and intuition, following a set of general guidelines. This does not ensure that the final mold design is acceptable or the best option. At the same time, mold makers are now highly pressured to shorten both leading times and cost, as well as to accomplish higher levels of mold performance. For these reasons, it is imperative to adopt new methods and tools that allow for faster and higher integrated mold design. To that end, a new global approach, based on the integration of well-known quantitative techniques, such as Design for Six Sigma (DFSS), Structural Equation Modeling (SEM), Axiomatic Design (AD) and Multidisciplinary Design Optimization (MDO) is presented. Although some of these methods have been largely explored, individually or in combination with other methodologies, a quantitative integration of all aspects of design, in such a way that the whole process becomes logical and comprehensible, has not yet been considered. To that end, the DFSS methodology, through its IDOV roadmap, was adopted. It is based on the ICOV Yang and El-Haik proposal, establishing four stages for the design process: Identify, which aims to define customers' requirements/expectations; Design, where the creation of a product concept, and its system-level design, is performed; Optimization, in which all the detailed design, through product optimization, is handled; and finally, Validation, where all product design decisions are validated, in order to verify if the new designed entity indeed meets customer and other requirements. As a result, this approach tackles the design of an injection mold in a global and quantitative approach, starting with a full understanding of customer requirements and converting them into optimal mold solutions. In order to validate it, an integrated platform was developed, where all different analysis modules were inserted and optimized through an overseeing code system. The results attained highlight the great potential of the proposed framework to achieve mold design improvements, with consequent reduction of rework and time savings for the entire mold design process.
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