Browsing by Author "Ferreira, C."
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- 3D printed devices to avoid hand contact with commonly shared surfacesPublication . Pais, A.; Ferreira, C.; Pires, V.; Silva, V.; Alves, J. Lino; Bastos, João; Belinha, JorgeIn the context of the COVID-19 pandemic, public spaces had to be quickly adapted to the new circumstances especially under the uncertainty of the pandemic development. Door handles are some of the most touched surfaces and so, this point of contagion was chosen to be tackled and two solutions were developed that would prevent direct touch with the handle: a portable and a fixed device. The portable device (HYHOOK + HYTIP) is a hook-like device holding a finger cover, which permits to open doors and push buttons safely. The fixed device (HANDGENIC) is meant to be assembled in door handles to equip buildings, such as universities or schools. With the fixed device, the user can open the door using their forearm which makes them less likely to transfer any particles to eyes, nose or mouth. The 3D printing Fused Filament Fabrication (FFF) process was selected as manufacturing technique, which allows the fast production of prototypes. This work portrays the development process and design iterations taking into consideration the concerns about the functioning of the devices and possible failures or alternative uses. To assure structural integrity of the parts, finite element (FE) analysis was used to verify its mechanical response. As conclusion, it was found that FE analysis indicate that the devices are structurally sound to be used in public spaces and that 3D printing is a useful way to rapidly develop devices while testing several design possibilities.
- Development and validation of a tool to evaluate resilience performance in metalworking industryPublication . Fernandes, J.; Ferreira, C.; Rubio-Romero, J.C.; Rodrigues, MatildeFor several organizations, occupational risk management is focused on risk assessment, accident investigation and analysis, and implementation of control measures. Investigation and analysis of accidents is often carried out taking into account causation models, with the objective of identifying the causes and determining effective corrective measures to improve both current practices and risk control systems. This behavior of the organizations fits in the traditional perspective of safety, realized as the absence of unwanted events
- iLeanDMAIC – A methodology for implementing the lean toolsPublication . Ferreira, C.; Sá, José Carlos; Ferreira, Luís Pinto; Lopes, Manuel P.; Pereira, Maria Teresa; Silva, F.J.G.Organizations focus must reside in their constant desire for improvement in order to satisfy their clients as a result of high-quality products, thus maximizing their profits through a waste reduction in the flow production. Lean thinking allows organizations to identify and eliminate wastes within the organization. The use of lean tools is considered a simple, efficient and cost-effective solution to achieve productivity and profit. DMAIC (Define, Measure, Analyze, Improve, Control) is a problem-solving methodology that improves processes, allows defect reduction and reduction of process variability, allowing companies to continuously improve their efficiency and performance. In this work, a combined methodology iLeanDMAIC based on Lean Tools and DMAIC was developed, aiming to help organizations to easily and accurately solve their problems. It includes a case-study implementation on an organization of the sector of wood products. We were able to successfully validate this methodology and to show its efficacy in enhancing production. Results using iLeanDMAIC allowed a reduction time in changeover in the assembly machine (from 39 min to 17 min), presenting this a 44% gain on manufacture. iLeanDMAIC can help organizations thrive against their competitors, make their business more cost-effective and efficient.
- Powered smart textile-based exoskeleton for human support movementPublication . Ferreira, C.; Fertuzinhos, A.; Silva, R.; Ramalho, M.; Vale, B.; Silva, J.; Costa, L.; Oliveira, C.; Ramôa, A.; Aguiar, F.; Pilastri, A.; Matta, A.; Dias, P.; Sampaio, R.; Machado, D.; Costa, M.; Roças, A.; Madureira, P.; Moreira, Juliana; Pereira, J. R.; Pereira, C.; Pereira, F. B.Industrial environments require people’s physical efforts related to excessive force, poor posture, and repetitive tasks that increase the risk of developing musculoskeletal diseases. Due to the high prevalence of postural complaints and consequent global health burdens, a significant demand has been conducted to build and implement powered lower and upper limb devices for human enhancement, considering the working layout/position, anthropometric and ergonomic data to generate valuable information for posture correction guidance.
- Quality and safety continuous improvement through lean toolsPublication . Santos, Gilberto; Sá, José Carlos; Oliveira, J.; Ramos, Delfina; Ferreira, C.The purpose of this chapter is to suggest the use of several lean tools that can be used, indicating the improvements that can be obtained with each of the recommended tools. The main objective is to be a contribution to the organizations, showing how they can detect the wastes in the productive flow through VSM, and at the same time to improve the quality of products through lean tools. The method presented was a case study. The various lean tools were also collected and described. This chapter intends to show several lean tools that can be applied in different situations, as well as, the wastes that each can eliminate and the benefits that are obtained from each one. Throughout the production process, with the support of Value Stream Mapping (VSM), it was possible to detect several wastes. A case study is presented as results from a work carried out in a company that is dedicated to the production of mechanical equipment. This work can be a guide to support organizations that wish to start their lean road. Smart value creation remains today dependent on the maturity of how lean management tools are applied. Lean, innovative technologies, critical knowledge, talent and big data need other dimensions to be sustainable. Quality and safety continuous improvement through lean tools, as well as, Industry 4.0 assumes a critical pillar for the new journey toward the future of our organizations.
- Study of the kinematics of a high-course steering systemPublication . Ferreira, C.; Silva, Francisco J. G.; Campilho, R.D.S.G.; Fecheira, J.S.In a context of mobility disruption, due to the accelerated growth of new technologies and sustainability policies, a new class of vehicles is emerging, depending on the type and its function, requiring new technologies suited to its goal. The autonomous modular platforms emerged, in this scenario, to reduce the time of placing electric vehicles on the market, the complexity of the supply and the total cost of production of the vehicle. To facilitate and adapt maneuverability of vehicles to the future challenges of mobility, this paper presents the study of different solutions for a steering system integrated in a modular platform already existing, that enables the vehicles 360° and 90° movements. The difficulty of developing this project is to find a mechanism that meets all kinematic requirements, without compromising the other systems of control and stability of the movement. Thus, considering the parameters of traction and suspension, possible solutions are developed, subsequently tested with the use of the SolidWorks software. Finally, it is concluded that of the solutions tested, the most satisfactory is the one that presents the best kinematic characteristics allied to the smallest course, despite being one of the solutions with more components.