Fluidization in small-scale gas-solid 3D-printed fluidized beds

<p>This research is focused towards the use of large-scale FDM 3D printing within the automotive industry, specifically to design a bespoke habitable sleeping environment attached to a Range Rover Sport. 3D printing has risen as a viable form of manufacturing in comparison with conventional methods. Allowing the designer to capitalise on digital data, enabling specific tailored designs to any vehicle model. This thesis asks the question “Can design use the properties of digital vehicle data in conjunction with large-scale FDM 3D printing to sustainably produce bespoke habitable sleeping environments for an automotive context?” Further to this, FDM 3D printing at a large-scale has so far not been explored extensively within the automotive industry. FDM 3D printing is an emerging technology that possesses the ability to revolutionise the automotive industry, through expansion of functionality, customisation and aesthetic that is currently limited by traditional manufacturing methods. Presently, vehicle models are digitally mapped, creating an opportunity for customisation and automatic adaption through computer aided drawing (CAD). This thesis takes advantage of the digitisation of the automotive industry through 3D modelling and renders as a design and development tool. This project explored a variety of methods to demonstrate a vision of a 3D printed habitable sleeping environment. The primary methodologies employed in this research project are Research for Design (RfD) and Research through Design (RtD). These methodologies work in conjunction to combine design theory and practice as a genuine method of inquiry. The combination of theory and design practice has ensued in the concepts being analysed, reflected and discussed according to a reflective analysis design approach. The design solution resulted in an innovative and luxury bespoke habitable sleeping space to be FDM 3D printed. Through the use of digitisation, the sleeping capsule was cohesively tailored to the unique design language of the Range Rover Sport. This thesis resulted in various final outputs including a 1:1 digital model, high quality renders, accompanied by small scale prototypes, photographs and sketch models.</p>

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Design, Development and Implementation of Vibratory Mechanisms to Be Utilized in Dynamics and Vibrations Courses

Volume 5: Engineering Education ◽

10.1115/imece2019-10235 ◽

2019 ◽

Author(s):

Yoseph Woldemariam ◽

Martin Garcia ◽

Tris Utschig ◽

Ayse Tekes

Keyword(s):

Vibration Isolation ◽

Cost Effective ◽

Small Scale ◽

Design Development ◽

Laboratory Equipment ◽

Flexible Beams ◽

Undergraduate Level ◽

3D Printed ◽

Dc Motor Driver ◽

Vibration Modeling

Abstract There is still a demand for novel laboratory equipment designs that are to be utilized in undergraduate level machine dynamics, mechanical vibrations, control theory and their related labs. Since the turn-key systems preferred in most undergraduate labs are expensive and require wide lab space, 3D printed portable, small scale and cost-effective vibrational lab equipment are designed to study the fundamentals of free and forced vibrations. Four laboratory equipment designs are proposed in this study to demonstrate the fundamentals of vibration such as free vibration, forced vibration, modeling, base excitation and vibration isolation. The first device is a vibration isolator and resonator mechanism incorporating large deflecting fixed-free flexible links and composed of primary and secondary masses and a linear actuator, the second mechanism is a compliant parallel arm consisted of flexible beams, mass and a support, third mechanism is a translational vibratory mechanism comprised of slider carts, 3D printed springs, rods and bearings and the final mechanism is the model of driver seat consisted of DC motor, driver and driven wheels and a mass. Main parts of each apparatus are built by 3D printing using either PLA or PETG filament. Learning outcomes and the methods of implementing each device to the course and their associated laboratories are provided.

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Hybrid Two-Scale Fabrication of Sub-Millimetric Capillary Grippers

Micromachines ◽

10.3390/mi10040224 ◽

2019 ◽

Vol 10 (4) ◽

pp. 224 ◽

Cited By ~ 3

Author(s):

Sam Dehaeck ◽

Marco Cavaiani ◽

Adam Chafai ◽

Youness Tourtit ◽

Youen Vitry ◽

...

Keyword(s):

Small Scale ◽

Release Mechanism ◽

Present Contribution ◽

Component Size ◽

Two Photon ◽

Uv Illumination ◽

Passive Release ◽

Fluid Supply ◽

Macro Scale ◽

3D Printed

Capillary gripping is a pick-and-place technique that is particularly well-suited for handling sub-millimetric components. Nevertheless, integrating a fluid supply and release mechanism becomes increasingly difficult to manufacture for these scales. In the present contribution, two hybrid manufacturing procedures are introduced in which the creation of the smallest features is decoupled from the macro-scale components. In the first procedure, small scale features are printed directly (by two-photon polymerisation) on top of a 3D-printed device (through stereolithography). In the second approach, directional ultraviolet (UV)-illumination and an adapted design allowed for successful (polydimethylsiloxane, PDMS) moulding of the microscopic gripper head on top of a metal substrate. Importantly, a fully functional microchannel is present in both cases through which liquid to grip the components can be supplied and retracted. This capability of removing the liquid combined with an asymmetric pillar design allows for a passive release mechanism with a placement precision on the order of 3% of the component size.

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Renewing Materials: 3D Printing and Distributed Recycling Disrupting Samoa's Plastic Waste Stream

10.26686/wgtn.17014067 ◽

2021 ◽

Author(s):

◽

Lionel Taito-Taaalii Matamua

Keyword(s):

3D Printing ◽

Participatory Design ◽

Design Research ◽

Low Cost ◽

Field Work ◽

Plastic Waste ◽

Waste Stream ◽

Small Scale ◽

The Arts ◽

3D Printed

<p>This research addresses the serious issue of plastic waste in the Pacific. Using Samoa as a case study, we hypothesise that distributed recycling combined with 3D printing offers an opportunity to re-purpose and add new value to this difficult waste stream. It is also an opportunity to engage diverse local communities in Samoa by combining notions of participatory design, maker-spaces and ‘wikis’ of parts with traditional Samoan social concepts such as ‘Fa’a Samoa’, or ‘the Samoan way’ and sense of community. The project seeks to explore creative and innovative solutions to re-purposing plastic waste via a range of design research methods. Field work in Samoa has established the scope of the issue through interviews with different stakeholders such as Government, waste management businesses, the arts and crafts community and education. The field work has also helped identify potential product areas and collaborative partners. The different types of plastic in the waste stream have been identified and material experiments such as plastic shredding and filament extrusion are underway using low cost open source processing equipment to transform plastic waste into usable 3D printing filament. From this filament, potential 3D printed end products are explored through a hands-on researching by making process. The experiments inform the design of workable, economically viable, socially empowering and sustainable scenarios for re-purposing and up-cycling plastic waste; printed in the form of useful and culturally meaningful 3D printed objects, artifacts and products.Applications range from creating greater awareness of the issue by way of tourism and the Samoan notion of ‘mea alofa’ or ‘gifting’, through to functional utensils and parts. It is an opportunity to expand Samoa’s traditional forms of craft into new self-sustaining communities, maker-spaces and small scale local industries. The outputs of the initial project are intended to provoke discussion and invite participation in the implementation of these different scenarios of production.</p>

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3D printed small-scale acoustic metamaterials based on Helmholtz resonators with tuned overtones

2017 IEEE SENSORS ◽

10.1109/icsens.2017.8234381 ◽

2017 ◽

Cited By ~ 1

Author(s):

Cecilia Casarini ◽

James F. C. Windmill ◽

Joseph C. Jackson

Keyword(s):

Small Scale ◽

Acoustic Metamaterials ◽

Helmholtz Resonators ◽

3D Printed

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Space heating using small-scale fluidized beds: A technoeconomic evaluation

International Journal of Energy Research ◽

10.1002/er.4440170602 ◽

1993 ◽

Vol 17 (6) ◽

pp. 445-466 ◽

Cited By ~ 8

Author(s):

W. A. MacGregor ◽

F. Hamdullahpur ◽

V. I. Ugursal

Keyword(s):

Fluidized Beds ◽

Space Heating ◽

Small Scale ◽

Technoeconomic Evaluation

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Can 3D Printing Bring Droplet Microfluidics to Every Lab?—A Systematic Review

Micromachines ◽

10.3390/mi12030339 ◽

2021 ◽

Vol 12 (3) ◽

pp. 339

Author(s):

Nafisat Gyimah ◽

Ott Scheler ◽

Toomas Rang ◽

Tamas Pardy

Keyword(s):

Systematic Review ◽

3D Printing ◽

Microfluidic Chip ◽

Performance Metrics ◽

Droplet Microfluidics ◽

Small Scale ◽

Scale Production ◽

Chemical Application ◽

Chip Fabrication ◽

3D Printed

In recent years, additive manufacturing has steadily gained attention in both research and industry. Applications range from prototyping to small-scale production, with 3D printing offering reduced logistics overheads, better design flexibility and ease of use compared with traditional fabrication methods. In addition, printer and material costs have also decreased rapidly. These advantages make 3D printing attractive for application in microfluidic chip fabrication. However, 3D printing microfluidics is still a new area. Is the technology mature enough to print complex microchannel geometries, such as droplet microfluidics? Can 3D-printed droplet microfluidic chips be used in biological or chemical applications? Is 3D printing mature enough to be used in every research lab? These are the questions we will seek answers to in our systematic review. We will analyze (1) the key performance metrics of 3D-printed droplet microfluidics and (2) existing biological or chemical application areas. In addition, we evaluate (3) the potential of large-scale application of 3D printing microfluidics. Finally, (4) we discuss how 3D printing and digital design automation could trivialize microfluidic chip fabrication in the long term. Based on our analysis, we can conclude that today, 3D printers could already be used in every research lab. Printing droplet microfluidics is also a possibility, albeit with some challenges discussed in this review.

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Automated draping analysis of 3D printed flexible isogrid structures for textile applications

Textile Research Journal ◽

10.1177/00405175211006210 ◽

2021 ◽

pp. 004051752110062

Author(s):

Jordan Kalman ◽

Kazem Fayazbakhsh ◽

Danielle Martin

Keyword(s):

Image Processing ◽

3D Printing ◽

Large Range ◽

Thermoplastic Polyurethane ◽

Small Scale ◽

Fused Filament Fabrication ◽

3D Print ◽

3D Printed

Fused filament fabrication (FFF) 3D printing can be used for manufacturing flexible isogrid structures. This work presents a novel draping analysis of flexible 3D printed isogrids from thermoplastic polyurethane (TPU) using image processing. A small-scale multi-camera automated draping apparatus (ADA) is designed and used to characterize draping behavior of 3D printed isogrid structures based on draping coefficient (DC) and mode. Circular specimens are designed and 3D printed that accommodate up to eight additional weights on their perimeters to enhance draping. Five infill patterns, three infill percentages, and three loading cases are explored to evaluate their impact on specimens’ draping coefficient and mode, resulting in 45 tests. The range of DCs in this study is 21.9% to 91.5%, and a large range of draping modes is observed. For the lowest infill percentage, specimen mass is not the sole contributor to the DC values and the infill pattern has a significant impact for the three loading cases. Considering draping modes, the maximum number of convex and concave nodes observed for 25% infill specimens with added weights is three. The draping behavior characterization developed in this study can be followed to design and 3D print new flexible isogrids with textile applications.

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Seismic response of a small-scale masonry cross vault: Experimental investigation by performing quasi-static and shake table tests

10.21203/rs.3.rs-188815/v1 ◽

2021 ◽

Author(s):

Nicoletta Bianchini ◽

Nuno Mendes ◽

Chiara Calderini ◽

Paulo XAVIER Candeias ◽

Michela Rossi ◽

...

Keyword(s):

Response Spectrum ◽

Experimental Tests ◽

Small Scale ◽

Shake Table ◽

Seismic Behaviour ◽

Shake Table Tests ◽

Seismic Safety ◽

Collapse Mechanisms ◽

3D Printed ◽

Complex Structural

Abstract The seismic safety assessment of 3D complex structural elements of historic buildings, such as cross vaults, is a challenge and experimental tests can provide relevant data for this purpose. This paper presents the results of two experimental campaigns in a reduced scale 3D printed vault characterized by asymmetric boundary conditions. The specimen adopted the typical geometry of groin vault (without ribs) and was made of polymeric bricks placed in an orthogonal bond disposition. The seismic behaviour of the vault was studied through quasi-static and dynamic tests using the shake table. In particular, an incremental dynamic analysis up to the collapse of the vault was carried out. The results obtained experimentally were analysed in terms of damage, collapse mechanisms, displacements, in-plane distortion and response spectrum-based analysis.

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