2015
Authors
Xavier, J; Fernandes, JRA; Frazao, O; Morais, JJL;
Publication
COMPOSITE STRUCTURES
Abstract
This work addresses the experimental identification of mode I cohesive law of wood bonded joints. The approach combines the double cantilever beam (DCB) test with both digital image correlation (DIC) and embedded fibre Bragg grating (FBG) sensors. The spectrum geometric mean of the FBG reflected spectral response was determined, and the wavelength evolution was used to define the fracture process zone (FPZ) development phase. This evaluation allowed a consistent selection of experimental range of over which the identification procedure of mode I cohesive law is build up. Mode I crack length, Resistancecurve and cohesive law parameters are characterised and discussed. The strain energy release rate (G(I)) is determined from the P-delta curve by the compliance-based beam method (CBBM). The crack tip opening displacement (w(1)) is determined by post-processing displacements measured by DIC. The cohesive law in mode I (sigma(1)-w(1)) is then obtained by numerical differentiation of the G(1)-w(1) relationship.
2015
Authors
Faria, BM; Reis, LP; Lau, N; Moreira, AP; Petry, M; Ferreira, LM;
Publication
PROGRESS IN ARTIFICIAL INTELLIGENCE
Abstract
Wheelchairs are important locomotion devices for handicapped and senior people. With the increase in the number of senior citizens and the increment of people bearing physical deficiencies, there is a growing demand for safer and more comfortable wheelchairs. So the new Intelligent Wheelchair (IW) concept was introduced. Like many other robotic systems, the main capabilities of an intelligent wheelchair should be: autonomous navigation with safety, flexibility and capability of avoiding obstacles; intelligent interface with the user; communication with other devices. In order to achieve these capabilities a good testbed is needed on which trials and users' training may be safely conducted. This paper presents an extensible virtual environment simulator of an intelligent wheelchair to fulfill that purpose. The simulator combines the main features of robotic simulators with those built for training and evaluation of prospective wheelchair users. Experiments with the real prototype allowed having results and information to model the virtual intelligent wheelchair. Several experiments with real users of electric wheelchairs (suffering from cerebral palsy) and potential users of an intelligent wheelchair were performed. The System Usability Score allowed having the perception of the users in terms of the usability of the IW in the virtual environment. The mean score was 72 indicating a satisfactory level of the usability. It was possible to conclude with the experiments that the virtual intelligent wheelchair and environment are usable instruments to test and train potential users.
2015
Authors
Silva, MF;
Publication
THIRD INTERNATIONAL CONFERENCE ON TECHNOLOGICAL ECOSYSTEMS FOR ENHANCING MULTICULTURALITY, PROCEEDINGS TEEM'15
Abstract
Presently we are witnessing an increasing adoption of industrial robots, with predictions for their further dissemination in distinct sectors. Some studies show that there is a lack of people able to plan the introduction of these equipments in manufacturing environments and to operate them after its inception, leading to the need to train undergraduates in the operation and programming of industrial robots. Due to the Portuguese economic situation, there is a lack of funding for the Higher Education Institutions, leading to the need of finding innovative ways to teach these subjects. Bearing these ideas in mind, ISEP began teaching a course on Industrial Robotics based in the achievement of the practical training using ABB RobotStudio (from ABB Robotics) robot simulation software for off-line programming. This paper describes the main results of such experience and the evaluation of the course made by the students who have attended this course. The results of surveys conducted to the students after the end of the course show the excellent acceptance that this course format has achieved among them, the good results that have been achieved in terms of their knowledge acquisition, and has allowed the author to get students feedback in order to introduce improvements in the course.
2015
Authors
Gil, FAS; Shafie khah, M; Bizuayehu, AW; Catalao, JPS;
Publication
2015 IEEE INTERNATIONAL CONFERENCE ON SMART ENERGY GRID ENGINEERING (SEGE 2015)
Abstract
In this paper, the impacts of type, size and placement of renewable energy resources (RERs) on the offering strategy of Plug-in Electric Vehicle (PEV) parking lots is investigated. To this end, a stochastic programming model is proposed to optimize the behavior of a PEV parking lot in energy and reserve markets, considering the interaction with RESs. On this basis, the PEV parking lot is modeled in a distribution system consisting of wind and photovoltaic power producers. Moreover, the stochastic model consists of uncertainty characteristics of PEV owners' behavior, wind and photovoltaic power generation. Several numerical studies are analyzed to indicate how the factors of the RESs affect the optimal offering strategy of the parking lots.
2015
Authors
Martins, M; Portugal, P; Vasques, F;
Publication
PROCEEDINGS OF 2015 IEEE 20TH CONFERENCE ON EMERGING TECHNOLOGIES & FACTORY AUTOMATION (ETFA)
Abstract
Wireless Sensor Networks (WSNs) have been widely considered as a promising solution to support different types of applications on industrial environments. Many of these applications impose strict dependability requirements, since a system failure may result in economic losses, or damage for human life or to the environment. The absence of an effective approach enabling the dependability evaluation of WSNs prevents system designers to forecast these type of scenarios or to optimize decisions regarding the criticality of the devices, network topology, levels of redundancy and network robustness that minimize the occurrence of faults. To bridge the gap between research achievements and industrial development, we present in this paper a framework to support the dependability evaluation of WSNs based on the automated generation of analytical dependability models from high level AADL (Architecture Analysis and Description Language) architecture models. The main objective of this framework is to relieve the end user from a deep knowledge of dependability modeling techniques and evaluation methods, focusing on their knowledge of the behavior and structure of the system.
2015
Authors
Peris, RJ; Martínez, MP; Kemme, B; Brondino, I; Pereira, JO; Vilaça, R; Cruz, F; Oliveira, R; Ahmad, MY;
Publication
IEEE Data Eng. Bull.
Abstract
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