Percorrer por autor "Fecheira, J.S."
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- 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.
- Studying the ZnO formation in coated steel wire ropes for the automotive industryPublication . Pinto, Gustavo Filipe; Silva, Francisco J. G.; Baptista, Andresa; Fecheira, J.S.; Campilho, R.D.S.G.; Viana, F.Bowden cables are abundantly applied in the automotive assembly lines leading to drive various devices, such as opening trunk or the fuel tank cap, triggering the handbrake, opening the doors, etc. The cable used in automotive metallic harness is commonly constituted of braided wire galvanized steel, which has been studied to resist the weather aggressions typically imposed by the conditions under which usually work. However, to allow this operating in a steady state way, the braided wire must have the appropriate quality. This work study the reasons of the formation of relatively abundant quantities of zinc oxide (ZnO) in metallic cables used in the automotive industry, a few weeks after their manufacture. It was concluded that there were serious shortcomings of cable cleaning between the wire forming operations and galvanizing, with deposition of ZnO enhancing elements in the interface, which would prove to be crucial to nucleation and development of ZnO on the surface. Thus, the main contribution of this work is to identify and describe the elements able to generate ZnO in coated steel wires, avoiding this phenomenon in the industry.