45 documents found, page 1 of 5
Optimal 3D printing of complex objects in a 5 - axis printer
Ramos, Bruna; Pinho, Diana; Martins, Daniela A.L.; Vaz, A. Ismael F.; Vicente, Luis NunesThree-dimensional (3D) printing, also known as additive manufacturing (AM), has emerged in the last decades as an innovative technology to build complex structures. It enables increasing design complexity and low-cost customization with a vast range of materials. AM capabilities contributed to a widespread acceptance of 3D printing in different industries such as the aerospace and the automotive. However, impor...
Curved layer path planning on a 5-axis 3D printer
Duarte, João; Espírito Santo, Isabel; Monteiro, M. Teresa T.; Vaz, A. Ismael F.Purpose – This paper aims to provide an approach to print shell-type objects using a 5-axis printer. The proposed approach takes advantage of the two additional printer degrees of freedom to provide a curved layer path planning strategy. Design/methodology/approach – This paper addresses curved layer path planning on a 5-axis printer. This printer considers movements along the three usual axes together with two...
Co-benefits between energy efficiency and demand-response on renewable-based en...
Dranka, Geremi Gilson; Ferreira, Paula Varandas; Vaz, A. Ismael F.Driven by the recent trends towards a smart power system configuration, there has been a greater focus within the literature on the integration between supply and demand-side resources. The contribution of this research is multifold since it provides a timely and required study, offering valuable insights into how the integration be-tween Demand-Side Management (DSM) resources with clean energy supply options m...
Dynamic FE model updating using particle swarm optimization method: A methodolo...
Figueiredo de Sá, R.; Nunes, J. P.; Vaz, A. Ismael F.; Hattum, F. W. J. vanTo increase the performance of an industrial cutting machine, this work studied the possibility of replacing its current main steel gantry by a Carbon Fibre Reinforced Polymer (CFRP) composite solution. This component strongly influences the most relevant characteristics of the equipment, namely accuracy and maxima allowed accelerations. The flexibility of composites in terms of number, thickness and orientatio...
A review of co-optimization approaches for operational and planning problems in...
Dranka, Géremi Gilson; Ferreira, Paula Varandas; Vaz, A. Ismael F.This paper contributes to a comprehensive perspective on the application of co-optimization in the energy sector – tracking the frontiers and trends in the field and identifying possible research gaps – based on a systematic literature review of 211 related studies. The use of co-optimization is addressed from a variety of perspectives by splitting the studies into ten key categories. Research has consistently ...
Integrating supply and demand-side management in renewable-based energy systems
Dranka, Géremi Gilson; Ferreira, Paula Varandas; Vaz, A. Ismael F.Demand-Response (DR) has emerged as a valuable resource option for balancing electricity supply and demand. However, traditional power system models have neglected to include DR within long-term expansion problems. We can summarize our scientific contributions in the following aspects: (i) design of a new integrated co-optimization planning model for supply and demand coordination; (ii) assessment of the techni...
Path generation, control, and monitoring
Faria, Carlos; Martins, Daniela A.L.; Matos, Marina A.; Pinho, Diana; Ramos, Bruna; Bicho, Estela; Costa, Lino; Espirito Santo, Isabel; Fonseca, JaimeA critical issue in additive manufacturing (AM) is the control of the printer actuators such that the deposition of material (or a few different materials) takes place in an organized way. Typically, the actuators are connected with a low-level controller that can receive computer numerical control (CNC) instruction. A 3D printer controller is, usually, expected to receive a set of CNC instructions in a format ...
Path generation, control, and monitoring
Faria, Carlos; Martins, Daniela; Matos, Marina A.; Pinho, Diana; Ramos, Bruna; Bicho, Estela; Costa, Lino; Espírito Santo, Isabel; Fonseca, Jaime C.A critical issue in additive manufacturing (AM) is the control of the printer actuators such that the deposition of material (or a few different materials) takes place in an organized way. Typically, the actuators are connected with a low-level controller that can receive computer numerical control (CNC) instruction. A 3D printer controller is, usually, expected to receive a set of CNC instructions in a format ...
Cost-effectiveness of energy efficiency investments for high renewable electric...
Dranka, Geremi Gilson; Ferreira, Paula Varandas; Vaz, A. Ismael F.Although several studies have recognized the challenges brought about the high integration of Renewable Energy Sources (RES), research has yet to systematically investigate the effects of different levels of Energy Efficiency Measures (EEMs) on power systems with a high share of RES. The primary aim of this paper is to quantitatively evaluate the economic impact of different levels of energy efficiency investme...
Automatic detection of small bowel tumors in wireless capsule endoscopy images ...
Vieira, Pedro Miguel; Freitas, Nuno Renato Azevedo; Valente, João; Vaz, A. Ismael F.; Rolanda, Carla; Lima, C. S.Purpose Wireless Capsule Endoscopy (WCE) is a minimally invasive diagnosis tool for lesion detection in the gastrointestinal tract, reaching places where conventional endoscopy is unable to. However, the significant amount of acquired data leads to difficulties in the diagnosis by the physicians; which can be eased with computer assistance. This paper addresses a method for the automatic detection of tumors in ...