1,355,154 research outputs found
Structured product development process implementation for a packaging company
No full textThis paper describes the analysis of a structured development process (SDP) that takes into account the particular specifications and requirements in the manufacture of packaging machines. The proposed approach is based on the well known "V-model" approach, which aims to support engineering teams in developing complex systems
Value chain vs life cycle approach for product extensions
No full textThe methodology presented in this paper aims at supporting the whole needs and the Stakeholder Requirements definition in product development or product extension projects. To achieve that goal, the methodology forces to take into account the relevant Stakeholders and the Product Life-Cycle phases they impact on for that product. The paper shows a practical example taken from a real product extension project where the methodology was used. Since the main inputs for product extensions usually come from the marketing department, it resulted to be very effective in broadening the perspective. Thus it ended up in a holistic list of requirements, covering the needs of all the Stakeholders. Requirements frame the development problem, hence, as more they are complete as less failure risks there are. The methodology requires further experiments in other industries to prove its generality. Nonetheless it is expected to provide great support in product extension activities by lowering failure risk and by helping in satisfying all the Stakeholder needs
Timoshenko vs Euler-Bernoulli beam: fractional visco-elastic behaviour
No full textThe Euler-Bernoulli beam theory is well established in such a way that engineers are
very confident with the determination of stress field or def
lections of the elastic beam based on
this theory. Conversely Timoshenko theory is not so much used by engineers. However in such
cases Euler-Bernoulli theory that n
eglects the effect of transversal
shear deformation leads to
unacceptable results. For inst
ance when dealing with the visco-elastic behaviour the shear
deformations play a fundamental role. Recent studies [1]-[2] on the response evaluation of visco-elastic Euler-Bernoulli beam under quasi-static and dynamic loads, have been stressed that for better capturing the visco-elastic behavior a fractional constitutive law has to be considered. In this
context it has been provided that, for homogeneous beam both correspondence principles also hold,
then the study of a fractional visco-elastic Euler-Bernoulli beam may be derived from the elastic one.
As aforementioned in dealing with visco-elasticity the Timoshenko beam model is more proper
than Euler-Bernoulli’s one, then
this paper provides important informations
to engineering
designers, introducing exact linking relationships between visco-elastic Euler-Bernoulli beam solutions and visco-elastic Timoshenko
beam solutions. Thus the effect of transverse shear deformations may be taken into account for, without the need of a studying a more complicated model
Fractional visco-elastic Timoshenko beam from elastic Euler-Bernoulli beam
No full textThe Euler-Bernoulli beam theory is well established in such a way that engineers are very
confident with the determination of stress field or deflections of the elastic beam based on this
theory. Conversely Timoshenko theory is not so much used by engineer freelancers. However in
such cases Euler-Bernoulli theory, that neglects the effect of transversal shear deformation leads to
unacceptable results. For instance when dealing with the visco-elastic behavior, shear
deformations play a fundamental role. Recent studies on the response evaluation of visco-elastic
Euler-Bernoulli beam under quasi-static and dynamic loads, have been stressed that, for better
capturing the visco-elastic behavior, a fractional constitutive law has to be considered. In this
context it has been provided that, for homogeneous beam correspondence principle also holds,
then the study of a fractional visco-elastic Euler-Bernoulli beam may be derived from the elastic
one. As aforementioned in dealing with visco-elasticity the Timoshenko beam model is more
proper than Euler-Bernoulli’s one, then this paper provides important information to engineering
designers, introducing exact linking relationships between elastic Euler-Bernoulli beam response
and fractional visco-elastic Timoshenko beam response. The ready-to-use tables and
straightforward formulation have been provided leading to tremendous cost analysis savings and
improved quality
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Product Service System Design: How to Design Humans Application of a methodology in a PSS development with high human involvement
No full textA three-step methodology is proposed to support development teams in product-service system (PSS) development projects. The methodology specifically addresses the problem of designing humans as part of the system. The human presence is a matter of fact when it comes to PSSs. They are the soft system delivering the service part of the PSS, which is also the most value adding for stakeholders. Furthermore many manufacturing companies are moving towards the integration of products and services. There are many structured approaches to support the design of software and tangible objects, i.e. the hard system. However there is a lack of guidance when it comes to the human presence design and integration with the hard system. The methodology aims at filling this gap. It was validated in a PSS development project within a company with a strong focus in product development. Hence it had to fit to an already in place product development framework. The findings were used to further refine the methodology. The methodology was fully applicable within that specific framework. However further validation runs are necessary to ensure its generality. The methodology will support the shift from pure manufacturer to product-service deliverer for those companies willing to change the rules of competition and to deliver more value to their customers
Product Architecture Management- an approach to Product Life Cycle
No full textAbstract. Today a lot of small, medium and also large companies have a project organizational setup. This means that the major part of the development activities are gathered thru the conduction of a project that at its completion will deliver a new version of the product. In this situation managing versions and resources for some of the product components (subsystems) could be a problem or performed in a non efficient way. This paper shows the approach applied in a company producing machines for the food industry. The methodology is based on the application of PLC (Product Life Cycle) principles aiming at the rationalization of the decisions made during the planning, analysis and implementation phases. The goal of the approach is to help designers and product architects to correlate the needs of projects stakeholders (requirements) with other needs related to the product strategy and roadmap in order to improve efficiency in terms of resource management, product variants and other aspects that affect the life cycle of the product
Fractional visco-elastic Timoshenko beam deflection via single equation
No full textThis paper deals with the response determination of a visco-elastic Timoshenko beam under static loading condition and taking into account fractional calculus. In particular, the fractional derivative terms arise from representing constitutive behavior of the visco-elastic material. Further, taking advantages of the Mellin transform method recently developed for the solution of fractional differential equation, the problem of fractional Timoshenko beam model is assessed in time domain without invoking the Laplace-transforms as usual. Further, solution provided by the Mellin transform procedure will be compared with classical Central Difference scheme one, based on the Grunwald-Letnikov approximation of the fractional derivative. Moreover, Timoshenko beam response is generally evaluated by solving a couple of differential equations. In this paper, expressing the equation of the elastic curve just through a single relation, a more general procedure, which allows the determination of the beam response for any load condition and type of constraints, is developed. © 2015 John Wile
Collaborative Robotics: A Survey From Literature and Practitioners Perspectives
No full textCollaborative robotics possesses the potential to revolutionise industrial automation by offering affordable and accessible solutions with reasonable skill requirements. However, identifying the most valuable and appropriate applications for this technology remains a challenge. This study conducted a comprehensive literature review to analyse the existing collaborative robotics applications, and the results showed that only a limited number of applications can be considered true collaboration, with even fewer classified as intelligent collaboration. The study comprised a survey designed to offer valuable insights to not only enhance the state-of-the-art analysis in the identification of existing challenges in the field of collaborative robotics but also to provide motivation to guide future advancements. By leveraging the survey results, researchers and practitioners will be better equipped to navigate the complex landscape of collaborative robotics and develop innovative solutions to tackle the identified challenges. This study also informs on the latest research and development in the field
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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