Percorrer por autor "Gaspar, Marcelo"
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- 3D printing online learning environements: multiple approaches towards self-learning of engineering design studentsPublication . Pikkarainen, Ari; Gaspar, MarceloThis paper presents an exploratory study conducted at two Higher Education Engineering Schools, namely in the Lapland University of Applied Sciences (Finland) and in the Polytechnic Institute of Castelo Branco (Portugal), with the aim of constructing digital learning environments that promote increasing learning autonomy to students working with 3D printing technologies in engineering design. Based on pilot blended learning experiences carried-out in both schools, new instructional design solutions are proposed and discussed, aiming at a widespread use of such digital platforms not only for blended and online learning processes in engineering schools, but also as Massive Open Online Courses open to wider communities interested in such technologies.
- Análise da ruína das lâminas de corte do descascador de toros da CELTEJOPublication . Ramalho, Armando; Pio, F.V.G.R.; Santos, P.A.C.; Gaspar, MarceloNo âmbito do processo industrial da Celtejo, Empresa de Celulose do Tejo, S.A., foi identificada uma quebra no desempenho do descascador que opera no parque de madeiras da sua unidade industrial. Esta quebra de desempenho verificava-se devido à ocorrência de um desgaste excessivo das suas lâminas de corte, obrigando à sua substituição regular e prematura. Tais quebras de desempenho tinham como implicação direta um incremento dos custos associados à operação e à manutenção do equipamento, bem como aos materiais e recursos humanos associados a essas operações, assim como às perdas de produção daí resultantes. A administração da Celtejo lançou o repto ao IPCB, no sentido de analisar a origem do desgaste dos componentes do descascador, bem como apresentar eventuais propostas de soluções com vista a minimizar o seu desgaste precoce. O presente trabalho constitui um estudo preliminar do problema, tendo sido desenvolvido, com supervisão, pelos alunos Francisco Vicente Granada Reis Pio e Paulo Alexandre Costa dos Santos através do seu trabalho “Ensaio metalográfico e microdureza dos microconstituintes do aço Hardox 500”, submetido para avaliação no âmbito da Unidade Curricular de Caracterização Mecânica dos Materiais do 2.º ano curricular da licenciatura em Engenharia Industrial.
- Análise do desgaste excessivo das ferramentas de corte do parque de madeiras de uma indústria de celulose: estudo de casoPublication . Ramalho, Armando; Pio, F.V.G.R.; Santos, P.A.C.; Gaspar, MarceloEste estudo tem como objetivo dar resposta ao desafio que nos foi lançado por uma empresa industrial de produção de pasta de papel – os dentes do descascador do parque de madeiras da sua unidade de industrial apresentavam um desgaste excessivo, face ao expectável, obrigando à sua substituição mensal, implicando custos excessivos, associados ao equipamento, material, recursos humanos e à perca de produção. O material utilizado, Hardox 500, tem caraterísticas consideradas adequadas para a utilização requerida, no entanto, concluiu-se neste estudo, que o processo de fabrico das lâminas degradava as suas propriedades mecânicas, conduzindo ao seu rápido desgaste quando colocadas em serviço. A solução proposta, consiste na alteração da tecnologia de corte dos dentes e encontra-se em fase de implementação.
- Circular economy in a multiple helix perspective: a reviewPublication . Gaspar, Marcelo; Julião, Jorge; Tjahjono, BennyThe Multiple Helix may be defined as a general framework to explore complex innovation dynamics amongst the main actors such as governance, academia, industry and society. Considering that the Multiple Helix approach adds to the traditional Triple Helix framework the influence of society in its multiple intervening roles, a wider and broader discussion is needed to fully comprehend the resulting dynamics in such complex ecosystems. As currently innovation cannot be discussed without considering sustainability aspects and goals, multiple combinations of knowledge and resources have to be addressed in an attempt to harmonize the ambitions of both environmental conservation and economic growth. To this end, current study aims at reviewing and discussing the Circular Economy fundamentals based on a Multiple Helix framework, as it is considered key that the relationship between industry and environment is crucial for industrial business performance. The body of knowledge that is created here is meant to support mainly students and practitioners, but also new researchers, which are addressing the problematic of Circular Economy in a Multiple Helix Perspective.
- Collaborative tools in higher education: the use of Wikis by industrial and mechanical engineering studentsPublication . Gaspar, Marcelo; Celorrio-Barragué, Luis; Pikkarainen, Ari; Glavan, Dan OvidiuContinuous technological advances keep challenging current and future engineers to anticipate and adapt to the new trends and paradigms that are expected to take place in a near future. One of such paradigms is the Industry 4.0 that encompasses the promise of a new industrial revolution based on the interconnectivity of people and systems to communicate, analyse and use information related to industrial processes. New challenges, as well as new opportunities, will rise in this digital landscape, demanding from future engineers the ability to adapt and grow in such ground-breaking environments. With such dynamic changes taking place in the current and future industries, engineering education has to adapt and prepare future graduates to work and function in these demanding environments. The set of skills envisaged to be held by future engineers is the ability to work and collaborate using digital means of participation as well as the ability to effectively use intercultural communicative skills. To this end, an exploratory study was conducted among different European Higher Education Engineering Schools to integrate a project with common aims and goals, resulting in various collaborative engineering activities that were designed to be carried out by undergraduate industrial and mechanical engineering students to further improve their learning outcomes and to acquire, or improve on, dedicated intercultural, communicative and colaborative skills. Following both quantitative and qualitative approaches, this study combined different types of data and methods of analysis in order to provide an exploratory account of the envisaged findings.
- Content, language and intercultural challenges in engineering education: (E-)strategies to improve instructional designPublication . Morgado, Margarida; Régio, Mónica; Gaspar, MarceloIntercultural, multilingual and culturally and academically diverse classrooms are a common reality in current higher education (HE) landscapes, as globalisation is effectively taking place in all major schools. Rethinking instructional design strategies that contribute to the overcoming of communication and cultural differences in both online and blended learning processes may help not only improve the development of more efficient online learning environments but also meet the challenges of current teaching and learning processes. Special focus will be put into engineering education through the medium of English and the training of engineering lecturers in HE through communities of practice (CoPs), which present, integrate and discuss how to integrate content and language (through what is known as the content and language integrated learning (CLIL) approach) as well as trends, challenges and opportunities related to recent technological developments on students’ learning ourcomes. The desciption of the pedagogical training shared through a CoP describes E-strategies to improve instructional design in engineering courses in online learning environments when English is used as a medium of instruction and integrated with content in a CLIL approach.
- Development of a preliminary finite element model to assess the effects of friction on the residual limb of a transfemoral amputeePublication . Ramalho, Armando; Ferraz, Miguel; Gaspar, Marcelo; Capela, CarlosThe use of numerical modelling tools allows optimizing the development of complex anatomical artefacts, such as customized prostheses for lower limb amputees. These numerical tools make it possible to characterize the interfacial interactions taking place between different parts of the prosthesis and the residual limb. This allows for understanding which rectifications and fittings having to be made on the custom design of the artificial body part without the need for manufacturing and donning prostheses. To such end, current research focused on the development of a preliminary Finite Element Model to assess the effects of friction on the residual limb of a transfemoral amputee, as the friction on the contact between the soft tissues, the liner and the prosthesis of the amputee is of major importance for his/her health and comfort.
- Dynamic elastic properties of E-Glass randomly oriented fiber reinforced SR GreenPoxy composite - Experimental and numerical analysisPublication . Ramalho, Armando; Gaspar, Marcelo; Correia, Mário; Vasco, Joel; Capela, Carlos; Rubén, RuiIn this article, the in-plane dynamic elastic properties of an E-glass randomly oriented fiber-reinforced SR GreenPoxy 56 composite were obtained based on the procedure specified in the ASTM E1876-21 standard. The experimental frequencies and the ones predicted by the simulation of the experimental procedure using a finite element analysis developed in the Patran/Nastran 2021 package were used in an iterative algorithm using sensitivity analysis to improve the first approaches of the dynamic elastic properties obtained by the impulse excitation technique. These experimental results are compared with the ones obtained by the 2D Short Fiber Composite model of the E-glass randomly oriented fiber-reinforced SR GreenPoxy 56 composite, developed in the Patran/Nastran 2021 software.
- Efeito do atrito no membro residual numa amputação transfemoral: influência do modelo constitutivo dos materiaisPublication . Ramalho, Armando; Ferraz, Miguel; Gaspar, Marcelo; Capela, CarlosNeste artigo é avaliado o efeito das propriedades mecânicas e tribológicas dos materiais na interação entre os diversos componentes da prótese numa amputação transfemoral, através de uma análise por elementos finitos. O modelo numérico é desenvolvido sobre o software MSC.marc. O atrito vai influenciar a distribuição de tensões entre as diversas interfaces – prótese/liner, liner/tecidos moles e tecidos moles/osso cortical. A distribuição das tensões de corte junto às interfaces, influencia o conforto do paciente, sendo uma das principais causas da geração de úlceras de pressão nos pacientes amputados que usam este tipo de próteses. É analisada a influência dos modelos constitutivos utilizados na modelação dos tecidos moles e do liner, na distribuição de tensão. Em concreto são comparados os resultados obtidos com a utilização de um modelo linear elástico com os obtidos com modelos hiperelásticos.
- Enhanced reconditioning of heavy-duty pulp industry equipment: advantages of abrasive waterjet cuttingPublication . Ramalho, Armando; Silva, Agostinho; Gaspar, Marcelo; Capela, Carlos; Celorrio-Barragué, Luis; Dan, GlăvanWithin a pulp industry production process, a drop in the performance of a wood log rotary debarker was identified. Such loss of performance was due to the occurrence of excessive wear of the device’s cutting blades, requiring their regular and premature replacement. The material used to manufacture the cutting blades, Hardox 500, has characteristics considered adequate for the required use. However, it was concluded that the blade manufacturing process degraded its mechanical properties, leading to its premature wear when placed in service. The present study intends to propose, characterize, and validate an alternative cutting process to manufacture the debarker’s cutting blades. Abrasive waterjet cutting technology was proposed to produce the cutting blades. The suitability of this manufacturing process is discussed considering the specified geometry and the material characteristics of the resulting cutting blades.
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