Testbed for Multilayer Conformal Additive Manufacturing

Abstract

Over the last two decades, additive manufacturing (AM) or 3D printing technologies have become pervasive in both the public and private sectors. Despite this growth, there has been little to no deviation from the fundamental approach of building parts using planar layers. This undue reliance on a flat build surface limits part geometry and performance. To address these limitations, a new method of applying material onto or around existing surfaces with multilayer, thick features will be explored. Prior work proposes algorithms for defining conformal layers between existing and desired surfaces, however this work does not address the derivation of deposition paths, trajectories, or required hardware to achieve this new type of deposition. This paper presents (1) the derivation of deposition paths given a prescribed set of layers; (2) the design, characterization, and control of a proof-of-concept testbed; and (3) the derivation and application of time evolving trajectories subject to the material deposition constraints and mechanical constraints of the testbed. Derivations are presented in a general context with examples extending beyond the proposed testbed. Results show the feasibility of conformal material deposition (i.e., onto and around existing surfaces) with multilayer, thick features.

Persistent Multi-Agent Search and Tracking with Flight Endurance Constraints

“…where the constants c xy,1 through c xy,6 for X(s) and Y(s) are calculated using the method described in [7]. Straight segments are first order, with only two endpoint constraints.…”

“…Straight segments are first order, with only two endpoint constraints. Coefficients of these polynomials are calculated similarly [7]. Note that Z(s) is set to a constant height h * without loss of generality.…”

“…Several works have also demonstrated autonomous replenishment methods: [6] used induction coils on a landing platform; [2] utilized a custom-designed battery swapping mechanism interfaced with a landing structure; and [7] proposed the use of a robotic arm to capture and place agents into a recharging structure to reduce the environmental uncertainty associated with precise landing. Like [2,6,7], we assume that any replenishment method is accomplished at a known, stationary home base location. In related work, [8] presented an autonomous system of delivery robots that provide charged batteries to robots completing an assigned task.…”

Automated Process Planning for Embossing and Functionally Grading Materials via Site-Specific Control in Large-Format Metal-Based Additive Manufacturing

“…Using conformal mapping, the object was warped to match the surface it would be constructed on. Interest is continuing to grow in conformal slicing for supporting greater geometric complexity and improved part quality [6][7][8][9]. There has also been significant interest in voxel-based process planning, a method that lends itself well to localized or site-specific parameter modifications [10][11][12][13][14][15], but does not necessarily lend itself well to the way in which many AM machines traditionally operate; vector-based processes planning is more widely applicable, and in the present work, a vector-based, site-specific process planning technique is presented.…”

Mapeamento da produção científica acerca do uso de biocompósitos nos processos de impressões 3D

“…A impressão 3D também é encontrada na literatura como fabricação rápida, prototipagem rápida ou manufatura aditiva e, ao contrário dos processos de fabricação convencionais (subtrativos), cria a forma final por meio da adição de materiais (HUANG et al, 2013;RODRIGUES et al, 2017). Vem apresentando crescimento significativo nos últimos anos (LAPLUME et al, 2016;KUTZER et al, 2017;NAVARRETE et al, 2018), alavancada pela crescente disponibilidade e acessibilidade das tecnologias, expandindo sua abordagem para áreas anteriormente inexploradas (KITSON, 2014). Os resultados bem-sucedidos de pesquisas mostram um otimismo de que a manufatura aditiva tem um lugar significativo no futuro da P a g e | 238 Revista Ibero-Americana de Ciências Ambientais v.11 -n.1  Dez 2019 a Jan 2020 fabricação (WONG et al, 2012), e um intenso interesse em ampliar o alcance das aplicações potenciais (LAURETO et al, 2017).…”