1,721,002 research outputs found
MULTI-CHAMBER ANTI-SLOSHING TANK AND METHOD FOR MANUFACTURING SUCH TANK
No full textThis patent protects the application of periodical structures to reservoir/tank in order to increase the safety when transporting dangerous substances
Serbatoio a camere multiple anti-sloshing e metodo di realizzazione
No full textNel brevetto è stata protetta una struttura interna di recipienti basata su compartizione basata su strutture periodiche. La problematica risolta dal brevetto riguarda l'incremento della sicurezza nel trasporto di fluidi pericolosi in caso di incidenti
Additive manufacturing in automotive: advantages and criticalities
No full textAdditive Manufacturing (AM) is becoming an important alternative to traditional manufacturing
processes based on chip removal. In AM “the design drives the shape” concept is valid,
opposed to the strategy “manufacturing drives the shape” which applies with traditional parts
obtained through casting, milling, lathing processing where several design constraints should
be respected. In many industries, aerospace and automotive, the lightweight design plays an
important role on the means of transport performances. Owing to AM potentialities, a widerange
of researches are focused on methodologies to obtain structurally optimized shapes:
structures obtained through topology optimization algorithms can be manufactured only in AM
due to their complex shape. The scope of this work is to analyze advantages and criticalities
of AM in automotive applications: a case study to evaluate pros & cons of AM is included,
together with a fuel reduction analysis which can be obtained thanks to proper lightweight
design of automotive components
Lattice structures representation in 2D drawings: a proposal for a standard
No full textThe interest in the Additive Manufacturing (AM) technology is surging due to its capability of printing components with complex optimized shapes that fit industrial engineering necessities better than traditionally manufactured parts. However, conventional Computer Aided Design (CAD) software packages are often limited to deal with such complex parts, especially when the AM part is designed using lattice structures: these are structures composed of repeated small elements, called cells, across a domain which generate a light and stiff component. The scope of this work is to analyze the problem of the lattice bidimensional representation and propose a standard for representation in assembly and 2D drawings. Rules useful to handle such hierarchic structures in CAD tools is developed, and a code in Python for the open-source software FreeCadTM has been developed to evaluate the effectiveness and usability of the standard. Simplified symbols to describe complex lattice structures instead of drawing all the small elements forming the lattice have been developed. The standard is useful in technical drawings for assembly representation where lattice components are used (assembly operators, maintenance, parts catalogues). A case study is included to describe how the proposed standard could be integrated in a 2D drawing following technical product documentation production typical workflow
Compressive response and failure of a micromechanical model for confined unidirectional fiber-reinforced composites
No full textThe longitudinal compressive response ofunidirectional high-stiffness carbon fibres radially confinedwith glass fibre and embedded in an epoxy matrix are analysed in this study. The method was originally developed for reinforced concrete columns. For this class of hybrid composites, initial fiber misalignment along with material nonlinearity leads to the initiation of fibre kinking. The load carrying capability is expected to be preserved due to the presence of lateral confinement.\ua0 However, compressive strength is highly depended on fibre alignment.\ua0 If via manufacturing highly aligned fibres can be formed, then this could potentially lead to micro-buckling failure initiation
New Aerodynamic Studies of an Adaptive Winglet Application on the Regional Jet CRJ700
Full text linkThis study aims to evaluates how an adaptive winglet during flight can improve aircraft
aerodynamic characteristics of the CRJ700. The aircraft geometry was slightly modified to integrate a
one-rotation axis adaptive winglet. Aerodynamic characteristics of the new adaptive design were
computed using a validated high-fidelity aerodynamic model developed with the open-source code
OpenFoam. The aerodynamic model successively uses the two solvers simpleFoam and rhoSimpleFoam
based on Reynold Averaged Navier Stokes equations. Characteristics of the adaptive winglet design
were studied for 16 flight conditions, representative of climb and cruise usually considered by the
CRJ700. The adaptive winglet can increase the lift-to-drag ratio by up to 6.10% and reduce the drag
coefficient by up to 2.65%. This study also compared the aerodynamic polar and pitching moment
coefficients variations of the Bombardier CRJ700 equipped with an adaptive versus a fixed winglet
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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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