21 documents found, page 1 of 3
Statistical methodologies for determining critical parameters in a pick-and-pla...
Lima, S.; Silva, L.; Gonçalves, A. Manuela; Malheiro, M. Teresa; Pinhão, M. T.; Machado, J.; Meireles, J.; Pontes, A. J.Surface mount technology (SMT) involves assembling surface mount devices (SMDs) using automated SMD placement machines (SMDPMs) to place SMDs onto the substrate’s surface with pick-and-place units. The SMDPMs are fully automated and high-speed, often representing a bottleneck in assembly lines. One primary cause of component rejection and assembly defects is vacuum loss. The goal of this study is to understand ...
Exploring eXtended-based learning approaches in Portuguese higher education: a ...
Alves, Anabela Carvalho; Lima, Rui M.; Mesquita, Diana; Malheiro, M. Teresa; Leão, Celina PintoThis paper presents a comprehensive study of what is named in this study as eXtended-Based Learning (xBL) approaches within the Portuguese educational landscape, including Problem-Based Learning (PBL), Project-Based Learning (PjBL), Challenge-Based Learning (ChBL), Service-Based Learning, and others. The study will contribute to characterizing different approaches being implemented by educators in Industrial En...
Vision inspection design for systematic production of needle beds: an industria...
Freitas, Luis; Malheiro, M. Teresa; Gonçalves, A. Manuela; Vicente, José; Pereira, Filipe; Morais, Francisco; Bessa, João; Machado, JoséThe increasingly standards of the electronic industry, especially in Printed Circuit Boards, make In-Circuit-Test Machines one of the most important systems on the production lines. With this, the pressure on the In-Circuit-Test Machines production to meet this strict requirements it is getting bigger every day. To react to this pressure it is necessary to update, in a technological point of view, the manufactu...
Compact schemes in time with applications to partial differential equations
Clain, Stéphane; Machado, Gaspar J.; Malheiro, M. TeresaWe propose a new class of fourth-and sixth-order schemes in time for parabolic and hyperbolic equations. The method follows the compact scheme methodology by elaborating implicit relations between the approximations of the function and its derivatives. We produce a series of A-stable methods with low dispersion and high accuracy. Several benchmarks for linear and non-linear Ordinary Differential Equations demon...
Stimulating critical thinking through report peer-review in a project-based lea...
Alves, Anabela Carvalho; Leão, Celina Pinto; Abreu, Maria Florentina Queirós Silva; Pimentel, Carina Maria Oliveira; Malheiro, M. TeresaProject-based learning (PBL) is an active learning methodology proposed in the early 20th century. Nevertheless, it continues to be a very suitable methodology for the current generation of students. Probably, it is more relevant now than before, since recent generations are more motivated by these learning methodologies. This is due to the fact that today’s students are totally absorbed by technologies that, i...
A novel route to optimize placement equipment kinematics by coupling capacitive...
Veiga, João; Lima, Susana; Silva, Luís Carlos Castro; Carneiro, Vítor Hugo; Pinhão, Mário; Gonçalves, A. Manuela; Malheiro, M. TeresaMachine end-effector kinematic analysis is critical to optimizing transporting components where inertial forces are the main loads. While displacements may be measured with relatively high accuracy in transportation equipment motors, the inertial forces in the transported components are seldom optimized. This is especially relevant in electronic component placement systems, where the components have a wide rang...
Conceptual design of a positioning system for systematic production of needle beds
Freitas, Luis; Oliveira, Rui; Malheiro, M. Teresa; Gonçalves, A. Manuela; Vicente, José; Monteiro, Paula; Ribeiro, PedroIn-Circuit-Test Machines are nowadays one of the most important systems on the productions lines in the electronic industry. Printed Circuit Board quality standards have become increasingly higher and all processes involved in its production must be checked and controlled with a high degree of reliability. One particular aspect that clearly did not follow the technological breakthroughs is the manufacturing pro...
Water management in several types of soil – A hands-on Science experiment for s...
Caldeira, Amélia; Lopes, S. O.; Malheiro, M. Teresa; Pereira, Rui M. S.; Gonçalves, A. Manuela; Araújo, Nuno Miguel Faria; Pereira, Paulo A.Young people should become aware of the fact that water is an important but rare resource and learn how to manage it efficiently. We present a project with some experiments for young students with that goal in mind. Students classified different types of soil and measured their electrical conductivity over time after being watered. They had to compare mathematical models that model soil behaviour in these circu...
A systematic analysis of an industrial pickup and placement production system
Silva, Luís F.; Lima, Susana; Meireles, José F.; Pinhão, Mário; Gonçalves, A. Manuela; Malheiro, M. Teresa; Machado, JoséSurface-mount technology is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards. The purpose of this study was to analyze nozzle change in two production lines. Following a previous study, it was proposed that one type of nozzle would place resistors while another type of nozzle would place capacitors, contrary to what happ...
A systematic analysis of printed circuit boards bending during in-circuit tests
Oliveira, Rui Miguel Costa; Freitas, Luís Miguel Capela Pereira Leite; Costa, Diogo; Vicente, José; Gonçalves, A. Manuela; Malheiro, M. TeresaWhen performing In-Circuit Tests (ICTs) of Printed Circuit Boards (PCBs), there are certain phenomena related with strain analysis that must be known in order to obtain stronger and more accurate testing results. During testing, PCBs are often subjected to mechanical bending efforts that induce excessive strain. This study focuses on the building of a Finite Elements Analysis (FEA) methodology that prevents exc...