FCT: UNIDEMI - Documentos de conferências nacionais
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- Aplicação da Filosofia Lean na Gestão da Manutenção de uma Empresa de Reparação NavalPublication . Carvalho, Maria; Navas, Helena V. G.; DEMI - Departamento de Engenharia Mecânica e Industrial; UNIDEMI - Unidade de Investigação e Desenvolvimento em Engenharia Mecânica e IndustrialThe radical changes that have been felt in the Global Market emphasized the need to upgrade the existing management systems. It was within this scope that a study has started in a Portuguese ship repair company, with the objective of applying lean philosophy in the production and maintenance management. This article presents not only the proposed model to implement the philosophy of continuous improvement in the current maintenance management systems, but also which tools are more appropriate in this market sector. The model presumes a global approach to the activities problems, in order to identify the most critical ones, bearing in mind the seven key principles to apply the Lean. The first conclusions of its application are presented, as well as the role the personnel need to have for the success of the project.
- Ankle Foot Orthosis (AFO) stiffness design for mitigation of ankle inversion injuryPublication . Teixeira, D.; Milho, J.; Carvalho, Marta; Loja, M. A. R.; UNIDEMI - Unidade de Investigação e Desenvolvimento em Engenharia Mecânica e IndustrialModelling and simulation of human movement has the potential to improve the design of medical devices and rehabilitation process by enabling the identification of cause-effect relationships in individuals suffering from neurological and musculoskeletal issues. The main goal of this work was to provide a simulation-based stiffness design for an Ankle Foot Orthosis (AFO) that can help to mitigate the risk of a sprain by ankle inversion during the landing in freefall which is known to occur for subtalar angles higher than 25 degrees. Computational simulations were performed using human movement models with and without a passive AFO, to access the AFO sensitivity for the translational stiffness that prevents the cuff from translating with respect to the footplate. The Design of Experiments (DoE) methodology was used to access sensitivities between the three principal directions of the AFO stiffness. Results revealed that the ankle inversion angle was less than 25 degrees when increasingly larger values of translational stiffness were used, although a nonlinear behaviour was observed between the three principal directions of the AFO stiffness, for which injury safe design configurations were obtained.