14 documents found, page 1 of 2
Assessment of influential operational parameters in the mitigation of CO2 emiss...
Balanuta, Vítor; Baptista, Patrícia; Carreira, Fernando; Duarte, Gonçalo; Casaca, Cláudia S. S. L.The European decarbonization goals and requirement for energy independence are mostly relying on intermittent renewable energy sources for electrification. A numerical model was developed to simulate the operation of a steam generator, allowing a study of the potential impacts of retrofitting existing coal-fired power plants to operate with biomass or coal–biomass mixtures on combustion parameters and CO2 emiss...
Supervision System 4.0 for a Road Tanker Washing Robot Manipulator
Vicente, L.; Carreira, Fernando; Campos, Francisco M.; Gonçalves Cavaco Mendes, Mário José; Calado, João Manuel Ferreira; Carvalho, GamboaThe washing of road tankers is currently still a manual process that requires an operator to place the washing head into the tanks. To increase productivity and operator safety, it is essential to implement automated systems with Fault Detection and Isolation (FDI) capabilities. On the other hand, the industry 4.0 paradigm promotes the use of collaborative systems that integrate with the other organization’s pr...
A photorealistic digital twin for a tank truck washing robotic system
Vicente, Luís; Lomelino, Pedro; Carreira, Fernando; Campos, Francisco M.; Gonçalves Cavaco Mendes, Mário José; Calado, J. M. F.In the current industrial context, the adoption of a digital twin (DT) has proven to be an appropriate tool to optimize the entire lifecycle of a system. This vision includes the adoption of a DT, in the collaborative network of organizations from the virtual modeling of a system, through its control, operation, namely simulation, implementation, and monitoring/supervision. To take full advantage of DTs, it is ...
Automatic control system for an oil-hydraulic actuator of a scissor lift
Costa, Lino M. F.; Carreira, Fernando; Mendes, Mário J. G. C.Lifting equipment’s have the purpose to lift goods within their safe working load and design rules specified in standards. However, some applications require additional care regarding handling the load when this care is out of the standard’s specifications. This paper presents the control and supervision system development of a scissor lift table, which should ensure, during its motion, that the vertical speed ...
Caminhar e corresponder ao mundo: notas sobre a experiência Guarani em terra de...
Carreira, FernandoEste é um texto sobre o ato de caminhar ou ainda sobre as formas de andar, porque de fato existem maneiras distintas da fazê-lo. Sendo mais preciso, o texto se ocupa do modo Mbyá-Guarani de caminhar na medida em que ele marca um tipo de éthos caminhante – uma forma de existir – que faz do movimento a condição de uma vida durável (a vida que se almeja). Assim, o caminhar interessa enquanto metáfora do ser, pois ...
A gantry robot automatic positioning system using computational vision
Beites, Nuno; Dias, Manuel; Gonçalves Cavaco Mendes, Mário José; Carreira, Fernando; Campos, F.; Calado, João Manuel FerreiraWith the new industrial revolution (industry 4.0) under way, there is a need to automate/digitalize even the simplest processes to keep companies competitive, efficient and secure. This work proposes an automatic and robotic positioning system with position control through the image of video cameras. The objective is to propose this type of automatic system to companies aiming to improve robotic systems operati...
Navigation system for mobile robots using PCA-based localization from ceiling d...
Carreira, Fernando; Calado, João Manuel Ferreira; Cardeira, Carlos; Oliveira, P.This paper aims the experimental validation of a mobile robot navigation system, using self-localization based on principal component analysis (PCA) of ceiling depth images. In this approach, a roadmap based on generalized Voronoi diagram (GVD) is built from an occupancy grid, that is defined in the ceiling mapping to the PCA database. The system resorts to the Dijkstra algorithm to planning paths, using the GV...
Finding a short path for mobile robot arm coverage of a point set
Campos, Francisco M.; Carreira, Fernando; Calado, João Manuel FerreiraThis paper introduces the problema of Mobile Robot Arm Covering (MRAC) along with a three-step procedure to solve it. In Mobile Robot Arm Covering one seeks the shortest path of a mobile robot equipped with a manipulator such that the manipulator workspace covers a given set of geometric entities. In this paper we consider the problema of covering a set of points. This is solved by a three-step procedure: the s...
11. Rosacruz, Teosofia Cristã e Ciências Arcanas
Mateus, Gabriel; Freitas, Rui Lomelino; de Mendonça Jr, Francisco; Bubello, Juan Pablo; Carreira, Fernando; Vieira, Otávio Santana; Lindemann, RicardoA Theosophia cristã, que emerge no Renascimento, em contraposição ao dogmatismo teológico, procurou unir a via religiosa com a via científica, assumindo-se como Religião do Pensamento, da que falaria Giordano Bruno ao descrever o hermetismo. Foi neste contexto que se desenvolveu a astrologia, a alquimia, as ciências médicas, a magia e o estudo da natureza, profundamente influenciados pelo trabalho de Paracelso....
A complete frontier-based exploration method for Pose-SLAM
Marques, Miguel; Carreira, Fernando; Calado, João Manuel FerreiraIn this paper we propose a complete frontier-based exploration method for Pose SLAM. The goal of current frontierbased exploration methods is to eliminate all frontiers in the environment map. This approach, however, does not meet the requirements of Pose SLAM mapping: besides arriving at a frontier free map, there is the need to close the loops in the environment. In fact, loop closing is instrumental to Pose ...