32 documents found, page 1 of 4
Work cell for assembling small components in PCB
Queirós, Mauro Daniel Monteiro; Pereira, João Paulo Lobato Oliveira; Faria, Valdemar Filipe Leiras; Meireles, José F.; Fonseca, Jaime C.; Borges, JoãoFlexibility and speed in the development of new industrial machines are essential factors for the success of capital goods industries. When assembling a printed circuit board (PCB), since all the components are surface mounted devices (SMD), the whole process is automatic. However, in many PCBs, it is necessary to place components that are not SMDs, called pin through hole components (PTH), having to be inserte...
Human-robot collaboration (HRC) with vision inspection for PCB assembly
Queirós, Mauro Daniel Monteiro; Pereira, João Paulo Lobato Oliveira; Costa, Nuno M.C. da; Marcelino, S.; Meireles, José F.; Fonseca, Jaime C.Flexibility and speed in the development of new industrial machines are essential factors for the success of capital goods industries. When assembling a printed circuit board (PCB), since all the components are surface-mounted devices (SMD), the whole process is automatic. However, in many PCBs, it is necessary to place components that are not SMDs, called pin through-hole components (PTH), having to be inserte...
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...
TMRobot series toolbox: interfacing collaborative robots with MATLAB
Pereira, João Paulo Lobato Oliveira; Queirós, Mauro Daniel Monteiro; Costa, Nuno M. C. da; Marcelino, S.; Meireles, José F.; Fonseca, Jaime C.As collaborative robots rise in popularity in industrial and domestic environments, TECHMAN Robot developed the TMRobot series, a wide variety of smart, safe, and straightforward collaborative robots. This paper presents the TMRobot Series Toolbox, which contains functions and methods to interface with the TMRobot series cobots from an external device using MATLAB. By using these, the users have access to conne...
Stiffness and damping properties of a composite beam design
Ferreira, M.; Peixinho, Nuno; Carneiro, V.; Ribeiro, P.; Meireles, José F.; Soares, DelfimThis work presents a characterization of dynamic mechanical properties of composite beams that were 3D-printed using fused filament fabrication. Two materials were used in the manufacturing process: a flexible material was used as filler of the hollow section (FilaFlex—Polyether-Polyurethane elastomer) while polylactic acid (PLA) polymer was used for the external wall of the beam. The main objective for such ma...
Characterizing the frequency response of compliant materials by Laser Döppler V...
Ricarte, Arlindo; Meireles, José F.; Inácio, OctávioLow-stiffness or compliant materials are inherently difficult to characterize in terms of dynamic mechanical properties. Their free-vibration behavior is not frequently analyzed, given that performing classic vibration testing in these type of materials may imply the tampering of the results by external sources, either by changes in the geometry of the sample, by gravity-induced buckling, or the instrumentation...
Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum ce...
Carneiro, Vítor Hugo Pimenta; Puga, Hélder; Meireles, José F.Aluminum-based cellular solids are promising lightweight structural materials considering their high specific strength and vibration damping, being potential candidates for future railway vehicles with enhanced riding comfort and low fuel consumption. The filling of these lattices with polymer-based (i.e., polyurethane) foams may further improve the overall vibration/noise-damping without significantly increasi...
Numerical analysis of the stress distribution in fillet welds and double fillet...
Neves, Francisco; Soares, Tiago; Pinho, A. C. Marques; Meireles, José F.Welding processes are extremely used in the metalworking industry all over the world. Sometimes the engineer has difficulties in finding solutions for the analytical calculation welded joints with eccentricity. In addition, calculations and analytical principles generally do not coincide with numerical results. In this work, analytically calculated stresses, are compared with numerical stresses for a double-fil...
Native Over-Expanded engine based on a planetary crankshaft with enhanced balan...
Capela, Guilherme; Costa, Tiago J.; Meireles, José F.; Martins, Jorge; Brito, F.P.Over-expansion is one of the promising strategies for improving Internal combustion engine (ICE) efficiency and emissions. It can be implemented by using an unconventional crankshaft. These mechanisms have mass production potential and acceptable friction losses, but also a complex kinematic and dynamic behaviour. This paper proposes such a crank design, a small planetary hypotrochoid over-expanded single cylin...
Main frame structural optimization for power transformers in short circuit
Linhares, C.; Carneiro, V. H.; Meireles, José F.; Pinho, A. C. Marques; Mendes, H.Electric power market is a contemporary challenge, due to the permanent increase in energy distribution demands, suppliers of power transformers have to constantly improve their engineering solutions for the design of equipment that are able to adapt to this permanent evolution. A fundamental challenge is the research of structural components embedded in power transformers tank that are able to withstand loadin...