Browsing by Subject "design"

Now showing 1 - 20 of 66

A Conversation with Julio Dicaprio from Since98
(ORANGE Magazine, 2019-12-03) Cho, Bailey
Blog Post - Redesigning the Vector Logo
(Student Engineering Council, 2019-04-08) Blackley, Nick
Construction of 1-D 4F and 3D-4F Coordination Polymers with Flexible Schiff Base Ligands
(2011-07) Yang, Xiaoping; Lam, Daniel; Chan, Christopher; Stanley, Julie M.; Jones, Richard A.; Holliday, Bradley J.; Wong, Wai-Kwok; Yang, Xiaoping; Lam, Daniel; Chan, Christopher; Stanley, Julie M.; Jones, Richard A.; Holliday, Bradley J.
Three new lanthanide 1-D coordination polymers ({[Ln(2)(H2L)(OAc)(6)]center dot EtOH center dot 2H(2)O}(n) (Ln = Eu (1), Er (2)) and {YbNiLCl(OAc)(2)(H2O)}(n) (3)) and a heterobinuclear complex [YbNiLCl3(H2O)(3)] (4) are reported which are formed from salen type Schiff-base ligands H2L (H2L = N,N'-bis(3-methoxysalicylidene) butane-1,4-diamine). The polymeric structures are formed by bridging H2L units in the case of 1 and 2, and by acetate groups in 3. The structures of 1-4 were determined by single crystal X-ray crystallographic studies and their luminescence properties in MeCN solution were determined.
Corporate Cannibal: A Fashion Accessories Collection
(2022-01) Zhang, Caleb
In the flesh. Corporate Cannibal is a fashion accessories collection exploring the tensions and dynamics that permeate the corporate world. The collection is comprised of four pieces: the Vice Bag, Control Ring, Incision Tie, and Cavity Tie. Each piece is meticulously designed to challenge the conventions of traditional corporate attire by incorporating subversive and provocative elements. By merging graphic imagery, tactile materials, and latent symbolism, Corporate Cannibal illuminates the complexities of our contemporary corporate landscape. It is an artistic exploration of the interplay between power, control, and agency in the corporate world, sparking conversation and dismantling traditional notions of corporate attire. The collection serves as a powerful example of the potential of fashion accessories transcending their mere functional and aesthetic purposes to become as evocative as any other art form.
Customised Design and Development of Patient Specific 3D Printed Whole Mandible Implant
(University of Texas at Austin, 2016) Mohammed, Mazhar I.; Fitzpatrick, Angus P.; Malyala, Santosh K.; Gibson, Ian
In this study we assessed the design criteria for the creation of a patient specific, whole mandible implant based on a patient’s medical imaging data and 3D printing. We tailor this procedure to a patient who will undergo a mandibulectomy due to cancer infiltration of the jaw. The patient CT scan data was used to generate a 3D representation of the patient’s skull, before the corrupted mandible was extracted. We examined two approaches based on classical symmetry matching and digital reconstruction of the defect to form the final model for printing. The final designs were then 3D printed and assessed for efficacy against a patient specific representative model of the skull and maxilla, where the final optimised design was found to provide an excellent fit. Ultimately, this technique provides a framework for the design and optimisation of a patient specific whole mandible implant.
Design and Optimization of a High Temperature Microheater for Inkjet Deposition
(University of Texas at Austin, 2015) VanHorn, Austin; Zhou, Wenchao
Inkjet deposition has become a promising additive manufacturing technique due to its fast printing speed, scalability, wide choice of materials, and compatibility for multi-material printing. Among many different inkjet techniques, thermal inkjet, led by Hewlett-Packard and Canon, is the most successful inkjet technique that uses a microheater to produce a pressure pulse for ejecting droplets by vaporizing the ink materials in a timespan of microseconds. Thermal inkjet has been widely adopted in many commercial 3D inkjet printers (e.g., 3D Systems ProJet X60 series) due to its low cost, high resolution, and easy operation. However, the viscosity of the printable materials has been limited to less than 40cP due to insufficient energy provided inside the nozzle to overcome the viscous dissipation of energy. This paper presents a study on the design and optimization of a high temperature microheater with a target heating temperature of more than 600˚C (compared to ~300 ˚C for current printhead) to increase the energy supply to the nozzle. The benefits are fourfold: 1) higher temperature will lead to faster vaporization of ink and thus higher jetting frequency and print speed; 2) higher temperature will make it possible for jetting materials with higher boiling points; 3) higher temperature will reduce the viscosity of the ink and thus the viscous dissipation of energy; 4) higher energy supply will increase the magnitude of the pressure pulse for printing more viscous materials. In this paper, a high temperature microheater was designed with the following objectives: to reduce thermal stress in heaters, and to minimize uneven heat distribution. A literature survey was first conducted on design, fabrication, and operation of thin-film resistive microheaters. A multiphysics numerical model was then developed to simulate electrical, thermal, and mechanical responses of the microheater. The model was validated by comparison to experimental data and existing models obtained from literature. With proper parameterization of the design geometry, the geometry of the microheater is optimized using a particle swarm optimization method. Results show the optimized high temperature microheater successfully operates at temperatures in excess of 600˚C. The design optimization enabled better characteristics for even heat distribution and minimizing stress. The design approach can serve as a fundamental means of design optimization for microheaters.
Design and Preliminary Evaluation of a Deployable Mobile Makerspace for Informal Additive Manufacturing Education
(University of Texas at Austin, 2017) Sinha, Swapnil; Rieger, Kelsey; Knochel, Aaron D.; Meisel, Nicholas A.
Additive Manufacturing (AM) has played an integral part in the growth of makerspaces as democratization of manufacturing continues to evolve. AM has also shown potential in enabling the successful amalgamation of art (A) with science, technology, engineering, and math (STEM) disciplines, giving new possibilities to STEAM subjects and its implementation. This paper presents the conceptual design and development of a deployable, mobile makerspace curriculum focused on AM education for a diverse range of participant backgrounds, ages, and locations. The aim is to identify effective means of informal learning to broaden participation and increase engagement with STEAM subjects through the context of AM. The curriculum is envisioned as “material-to-form,” offering separate modules that present opportunities for self-directed learning through all the stages of design, material use, and manufacturing associated with AM. Pilot studies of the curriculum were performed to identify potential changes to improve the effectiveness of the mobile makerspace.
Design and Robotic Fabrication of 3D Printed Moulds for Composites
(University of Texas at Austin, 2018) Velu, Rajkumar; Vaheed, Nahaad; Raspall, Felix
3D printing technologies have a direct impact on manufacturing the composite structures and in particularly fabrication of molds. Molds produced through additive manufacturing methods would greatly improve product features. The material selection and process conditions involved for producing mold tooling, mainly towards Automated fiber placement (AFP) work cells. In this study, the main objective is to improve the design and fabrication of composite parts through complex molds as well as to assess and improve the production workflow through the development of an effective design environment for the existing fiber placement operation. A robotic arm will be used to hold the print surface and to follow a pre-programmed print path with a stationary extruder to fabricate the mold tooling. This paper will present a review on the selection process for mold materials and the initial experimental work carried out to investigate required properties of 3D printed molds.
Design and Simulation of 3D Printed Air-Cooled Heat Exchangers
(University of Texas at Austin, 2016) Felber, R.A.; Rudolph, N.; Nellis, G.F.
The use of material extrusion with conductive fillers is explored for air-cooled heat exchangers. A general overview of the manufacturing tasks, design criteria, printability constraints, and modeling techniques is given, along with experimental data from prototype testing. The first sub-scale prototype design is an air-water crossflow heat exchanger designed to transfer around 100 Watts. It was printed with unfilled conventional ABS and the air channels designed with an array of round pin fins to enhance heat transfer. The prototype was also CT-scanned for inspection of the printed pin fin shapes.
Design for Additively Manufactured Lightweight Structure: A Perspective
(University of Texas at Austin, 2016) Yang, L.; Harrysson, O.L.A.; Cormier, D.; West, H.; Zhang, S.; Gong, H.; Stucker, B.
The design of lightweight structures realized via additive manufacturing has been drawing considerable amount of attentions in academia and industries for a wide range of applications. However, various challenges remain for AM lightweight structures to be reliably used for these applications. For example, despite extensive advancement with geometric design, there still lacks adequate understanding with the process-material property relationship of AM lightweight structures. In addition, a more integrated design approach must also be adopted in order to take non-uniform material design into consideration. In our works, a design approach based on unit cell cellular structure was taken in the attempt to establish a comprehensive design methodology for lightweight structures. Analytical cellular models were established to provide computationally efficient property estimation, and various design factors such as size effect, stress concentration and joint angle effect were also investigated in order to provide additional design guidelines. In addition, it was also found that the geometry and microstructure of the cellular structures are dependent on both the process setup and the feature dimensions, which strongly support the argument to establish a multi-scale hierarchical cellular design tool.
Design Guides for Biological Wastewater Treatment Processes
(University of Texas at Austin, 1970-08) Halbert, B.E.; Malina, J.F. Jr.
Design Guides for Biological Wastewater Treatment Processes: Performance of Biological Treatment Processes
(University of Texas at Austin, 1972-05) Malina, J.F.; Kayser, R.; Eckenfelder, W.W. Jr; Gloyna, E.F.; Drynan, W.R.
Design Guides for Biological Wastewater Treatment Processes: Performance of the Aerated Lagoon Process
(University of Texas at Austin, 1970-12) Fleckseder, H.R.; Malina, J.F. Jr
Design Guides for Biological Wastewater Treatment Processes: Waste Stabilization Pond Performance
(University of Texas at Austin, 1970-05) Aguirre, J.; Gloyna, E.F.
Design Optimisation of a Thermoplastic Splint
(University of Texas at Austin, 2017) Fitzpatrick, Angus; Mohammed, Mazher; Collins, Paul; Gibson, Ian
Following partial hand amputation, a post-surgery orthosis is required to hold the remaining ligaments and appendages of the patient in a fixed position to aid recovery. This type of orthosis is traditionally handmade and fabricated using laborious and qualitative techniques, which would benefit from the enhancements offered by modern 3D technologies. This study investigated the use of optical laser scanning, Computer Aided Design (CAD) and Material Extrusion (ME) additive manufacturing to manufacture a polymeric splint for use in post-surgical hand amputation. To examine the efficacy of our techniques, we take an existing splint from a patient and use this as the template data for production. We found this approach to be a highly effective means of rapidly reproducing the major surface contours of the orthosis while allowing for the introduction of advanced design features for improved aesthetics, alongside reduced material consumption. Our demonstrated techniques resulted in a more lightweight and lower cost device, while the design and manufacturing elements afford greater flexibility for orthosis customisation. Ultimately, this approach provides an optimized and complete methodology for orthosis production.
Design Resources for the Waller Creek District
(City of Austin, 2011) City of Austin Planning and Development Review
Design, Fabrication, and Qualification of a 3D Printed Metal Quadruped Body: Combination Hydraulic Manifold, Structure and Mechanical Interface
(University of Texas at Austin, 2017) Geating, J.T.; Wiese, M.C.; Osborn, M.F.
Additive manufacturing allows designers to make complex, efficient parts that are not achievable through conventional manufacturing techniques. Efficiencies are achieved by combining structural members, component interfaces, and hydraulic power distribution elements while eliminating redundant structural mass and volume. This paper documents the design, fabrication, inspection and testing of complex additively manufactured metal components. Parts utilizing AlSi10Mg aluminum alloy combine the roles of hydraulic manifold, mechanical interface, and core structure for a meso-scale quadruped robot. These parts allow Naval Research Laboratory (NRL) engineers to design and construct a highly capable quadruped robot that is both dynamic and lightweight. Metal parts were designed with computer aided design (CAD) and constructed using powder-bed direct laser metal sintering (DLMS). High-pressure hydraulic lines with internal fluid passageways were printed into the body assembly seamlessly creating a complex hydraulic manifold. After fabrication, a rigorous program involving post-processing, inspection, and destructive and non-destructive testing was performed to validate the design and manufacturing methods. The manifold has been approved for use and integrated on the quadruped, awaiting system level testing.
Designing a Mobile App for Individuals Recovering from an Opioid Addiction
(2018-06) Levin, Hannah
A Dicationic Calix 4 Pyrrole Derivative and Its Use for the Selective Recognition and Displacement-Based Sensing of Pyrophosphate
(2012-03) Sokkalingam, Punida; Kim, Dong Sub; Hwang, Hyonseok; Sessler, Jonathan L.; Lee, Cang-Hee; Kim, Dong Sub; Sessler, Jonathan L.
A new bis-pyridinium calix[4] pyrrole derivative is reported. This system forms a non-fluorescent complex upon exposure to the chromenolate anion. The resulting supramolecular ensemble binds the pyrophosphate anion with high affinity (K-a (2.55 +/- 0.12) x 10(7) M-1) in acetonitrile. It exhibits sensitive "turn-on" fluorescence when exposed to tetrabutylammonium pyrophosphate, and does so in preference to other anions, including the fluoride and phosphate anions.
Effect of a Herringbone Mesostructure on the Electromechanical Properties of Piezofiber Composites for Energy Harvesting Applications
(2017-02) Avazmohammadi, R.; Hashemi, R.; Avazmohammadi, R.
Piezoelectric materials are often used in energy harvesting devices that convert the waste mechanical energy into effective electrical energy. Polymer-based piezoelectric composites appear to be promising candidates for use in these devices, as they offer a number of advantages, such as sufficient flexibility and environmental compatibility. However, a major drawback associated with these composites may be that their effective electromechanical properties are usually weaker than those of the piezoelectric constituents used in them. In this paper, we propose a class of polymeric-based piezoelectric composites with a laminated mesostructure that offer improved electromechanical properties over unidirectional piezofiber composites and can even possess stronger electromechanical properties than their piezoelectric constituents for certain modes of operation. We present examples of enhanced properties of these composites including effective piezoelectric charge and voltage coefficients, as well as effective electromechanical coupling factors for two-dimensional operation modes. We conduct an optimization to identify the optimal microstructure for the highest values of the coupling coefficients within this class of composites. Our findings demonstrate the potential in designing piezoelectric composites with a hierarchical structure to achieve significantly amplified electromechanical properties for energy harvesting applications.