Dissertations / Theses on the topic 'Foam printing'
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Hu, Xusheng. "Study of the Thermal Performance of Metal Foam and PCM Composite for Thermal Energy Storage." Thesis, Troyes, 2021. http://www.theses.fr/2021TROY0003.
Full textThe aim of this Ph.D. thesis is to study the thermal performance of metal foam and phase change material (PCM) composite by using the experimental and numerical methods, in which metal foam possesses a cubic cell structure and is fabricated by 3D printing technique. Firstly, the effects of contact and heat conditions on heat storage rate of PCM composite are investigated to provide theoretical guidance for the practical application of PCM composite in thermal energy storage (TES) system. Then the metal foam with a cubic cell structure is designed and fabricated by 3D printing. The experimental investigation is carried out to examine the melting evolution of PCM embedded in metal foam. Meanwhile, the pore-scale numerical method is also proposed and used to investigate heat transfer characteristics of PCM composite. It is found from the results that the embedding metal foam can short the total melting time of PCM. Considering the influence of morphology parameters of metal foam, the thermal behavior of metal foam with different porosities and pore densities is numerically studied. The last part of this thesis explores the application of metal foam in PCM based heat sink. The thermal response of heat sinks using PCM composite is obtained by the experimental test, including base temperature, temperature variation, operating time and enhancement ratio of operating time. Also, the effects of the porosity of metal foam and the power level of the heater on the thermal response of heat sink are investigated
Sundaram, Subramanian Ph D. Massachusetts Institute of Technology. "3D-printing form and function." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120416.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 153-171).
Integrating diverse functions inside man-made parts with specific shapes, in a highly scalable manner, is the central challenge in manufacturing. Functional integration is typically achieved by assembling specialized parts, each independently made using carefully designed production techniques - for example, in assembly lines in the automotive industry. Externally assembling specialized parts is tedious at certain length scales (e.g. mesoscale manufacturing), imposes restrictions on achievable geometries, and limits functional integration. In contrast, nature excels at packing disparate materials and functions into unconstrained geometries across different length scales (e.g. distributed sensors in cuttlefish, or sensorimotor pathways and resonant muscles in insects). These far exceed our current fabrication capabilities, and replicating all the functions of natural systems has remained a distant dream. 3D-printing has resolved many challenges in fabricating complex geometries, but despite its promise, assembling diverse materials (including solids, liquids and thin-films) and functions inside a single, printed composite is a current challenge. This thesis presents a set of materials, processes and design strategies - a full experimental toolkit - to address the question: how can we distribute diverse materials and functions in free-form geometries? First, a fully-3D-printed autonomous composite that can sense an external stimulus, process it, and respond by varying its optical transparency is described. The composite consists of seamlessly integrated solids (UV-cured polymers), thin-films (conducting and semiconducting, solvent-evaporated films), and encapsulated liquids. Techniques to engineer material interfaces are also presented in this section. A stimulus-free strategy to 3D-print self-folding composites at room temperature is presented in the second part of this thesis. Specifically, the focus is on printing flat electrical composites that fold into pre-programmed shapes after printing using residual stress defined in specific regions. This provides advantages in the fabrication speed, and also expands the range of achievable geometries when using solvent-based inks. The third portion of this thesis focuses on 3D-printing soft actuators. After highlighting a few example applications of printed actuator arrays, this is used as a case study for topology optimization based design strategies. It is shown that the inclusion of a topology optimizer in the 3D-printing pipeline enables the automated design and fabrication of high-dimensional designs. The final section of this work focuses on creating tactile sensor arrays, with an emphasis on the acquisition of tactile datasets that can be used to understand the human grasp. The concluding section summarizes the role of the fabrication strategies presented here in creating composites of increasing levels of autonomy and self-sufficiency.
by Subramanian Sundaram.
Ph. D.
Leines, Kevin B. "The influence of the position of a color control bar on a form when determining the most appropriate location to measure variability in solid ink density and dot gain of a printed product /." Online version of thesis, 1990. http://hdl.handle.net/1850/10926.
Full textAbd-el-Kader, Magdy Ezzat. "Application of hot melt ink jet processes for imaging at offset printing form cylinder." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970645775.
Full textAbd, El Kader Magdy Ezzat. "Application of Hot-Melt Ink Jet Processes for Imaging at Offset Printing Form Cylinder." Doctoral thesis, Universitätsbibliothek Chemnitz, 2004. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200400092.
Full textDer Fortschritt im Bereich von Charakterisierung und Verständnis für Hot-melt Ink Jet Prozesse zur Bebilderung von Offsetdruckform-Zylindern ist ein Ergebnis dieser Forschung. Die Systematik dieser Arbeit basiert auf einem theoretischen Teil, um einen geeigneten Löschprozess auszuwählen. Der Löschprozess hängt von den Eigenschaften des Hot-melt Ink Jet Materials und der genutzten Aluminiumdruckoberfläche ab. Diese werden systematisch im Labormaßstab experimentell untersucht. Der thermische Prozess wurde einerseits durch Benetzbarkeitsprüfungen und anderseites durch Rasterelektronmikroskopaufnahmen bewertet.Der Ultraschallprozess ist ein nasser Löschprozess. Die Untersuchungen wurden in vier Stufen systematisch durchgeführt - Auswahl vom geeigneten Lösungsmitteln - Einflüsse von ausgewählten Lösungsmitteln auf nicht beschichtete und beschichtete Aluminium platten - Evaluation eines Ultraschalllöschprozesses - Validation eines Löschprozesses; zur Bewertung des Löschprozesses wurden mehrere Druckplattenproben bebildert und gelöscht Die Ergebnisse wurden durch UV/Vis Spektrometer, Kontaktwinkel, Profiliometrie und Visuelle Mikroskopie getestet
Al-Hachami, Wathiq. "Investigation of pico-litre inkjet printing for nano-gram scale solid form screening of pharmaceuticals." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52031/.
Full textGissibl, Timo [Verfasser], and Harald [Akademischer Betreuer] Giessen. "3D printing of sub-micrometer accurate ultra-compact free-form optics / Timo Gissibl ; Betreuer: Harald Giessen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1183678215/34.
Full textHempson, Garth Jake. "The naturally imperfect form : investigations of the application of digital sculpting methods - extracted art : incorporating and translating ‘found art’ into the medium of digital sculpture." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/60246/1/Garth_Hempson_Thesis.pdf.
Full textXu, Shang. "Investigations into the Form and Design of an Elbow Exoskeleton Using Additive Manufacturing." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103204.
Full textMaster of Science
Wearing an exoskeleton should be easy and stress-free, but many of the available models are not ergonomic nor user-friendly. To make an exoskeleton that is inviting and comfortable to wear, various nontraditional methods are used. The arm exoskeleton prototype has a lightweight and ergonomic frame, the joints are soft and compact, the cable-driven system is safe and low-profile. This design also brings aesthetics to the exoskeleton which closes the gap between engineering and design.
Dickman, Daina Elizabeth. ""I'd created my own truths by printing my zine." Women-written Perzines as a narrative form for disclosure and advice giving." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406717512.
Full textSvatík, Juraj. "Funkční pěny s gradientem hustoty." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401848.
Full textRežnáková, Ema. "Příprava a charakterizace lehčených polymerních materiálů s hierarchickou celulární strukturou." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414127.
Full textZhang, Chuan. "Aluminum foams composite : elaboration and thermal properties for energy storage." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0015/document.
Full textThe objective of this thesis is to study and optimize the manufacturing process of metal foams and the thermal behavior of the aluminum foam/phase change material (PCM) composite by experimental and numerical methods. The manufacturing process of open-cell aluminum foam is developed and optimized to precisely control the parameters of mufacturing. Two pore-scale models of high porosity aluminum foams (HPAF)/PCM composite and low porosity aluminum foams (LPAF)/PCM composite are established for numerical simulation. By simulating the melting process of a layer energy storage system, the HPAF/PCM and LPAFS/PCM composite are compared numerically in order to evaluate the energy storage performance. The results show that aluminum foam improves greatly the heat transfer process in PCM due to its high thermal conductivity. The porosity of aluminum foams could not only influence the melting process of composite but also the energy storage performance. Thanks to the collaboration with EPF, a new manufacturing method of periodic open-cell aluminum foams is developed based on 3D rapid tooling. The thermal behavior of the periodic open-cell aluminum foams/PCM composite is experimentally and numerically analyzed
Jourdan, David. "Conception numérique de textiles auto-déployables." Thesis, Université Côte d'Azur, 2022. http://www.theses.fr/2022COAZ4008.
Full textPrinting-on-fabric is a recent manufacturing technique which consists in extruding molten plastic into pre-stretched fabric using standard additive manufacturing technologies. Printing-on-fabric recently gained popularity as a low-cost fabrication technique for designing deployable structures which can pop out of shape when the fabric is released. The complex morphing behavior of this composite material can be explained by metric frustration phenomena which are described in this thesis. We leverage these phenomena to build several applications aiding the design of self-actuated, lightweight structures.We first present a (forward) design tool for fabricating lightweight architectural models based on a tiling of star patterns, with the dimensions (and hence physical properties) of the individual pattern elements varying over space. Users of this system design free-form shapes by adjusting the star pattern; our system then automatically simulates the complex physical coupling between the fabric and stars to translate the design edits into shape variations.We then extend the form-finding tool to a general-purpose simulation method that can predict the buckling behavior of a variety of printed-on-fabric designs besides star tilings. We show the importance of modelling the bilayer effect caused by the differential compression at the interface between the plastic and fabric layers, as well as the anisotropic properties of the fabric.Finally, an inverse design tool that is able to reproduce target shapes with printing-on-fabric using a dense pattern of closely-spaced ribbons is introduced. The core of this method is a parameterization algorithm that bounds surface distortions along and across principal curvature directions, along with a pattern synthesis algorithm that covers a surface with ribbons to match the target distortions and curvature given by the aforementioned parameterization
Trnovec, Bystrik. "Experimentelle Untersuchungen zur Schichtbildung im Tiefdruck mittels hydrophobierter Druckform mit Applikationsbeispielen aus dem Bereich der gedruckten OPV." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-209748.
Full textIn this work is described experimental research about layer forming from non-Newtonian fluids in gravure printing on non-porous substrates. The viscous fingering, caused through fluid dynamics at splitting of printed material should be decreased by hydrophobic-surface modification of gravure printing form. The aim was to print wave-free homogenous layers. To achieve comparable results, modified and pure form were used simultaneously to print the same material. The printed material was mainly PEDOT:PSS and other, which is used in printed electronics. The properties (surface tension, viscosity) of printed materials were varied by additives. Printing conditions were varied too. The characteristic of printed layers were studied: resistivity, roughness, density, etc. The results shows decreasing of waviness, roughness and viscous fingering in final layer through use of hydrophobic gravure printing form, compared to print results with common printing form. This can be applied not only in the field of printed electronics
Taborda, Sérgio. "Percepção e presença-o corpo na escultura, cinema e biotecnologias." Master's thesis, Instituições portuguesas -- UNL-Universidade Nova de Lisboa -- FCSH-Faculdade de Ciências Sociais e Humanas, 1999. http://dited.bn.pt:80/29026.
Full textMusil, Jiří. "Hledání tvaru skořepinových konstrukcí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-390254.
Full textLiu, Eunice. "Design gráfico: processo como forma." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/16/16134/tde-14102013-154730/.
Full textCreativity in the use of printing, reproduction, engraving, graphic finishings, editorial, binding and material resources in graphic design, denominated processes, is the theme of this research. The investigation is originated by projects, product of disciplinary practice, and is documented by image, for visual science. Technical, formal (related to form), and project studies explore relationships between process and form, resulting in a repertoire of parameters and possibilities. Pure form is graphic and constructed form, material shaped by processes, means of production by which form is tooled. The knowledge of processes is project resources, and creative appropriations of them, qualify a good design
Barajas, Leandro G. "Process Control in High-Noise Environments Using A Limited Number Of Measurements." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/7741.
Full text葉曾欽. "The study on the foam printing of polyester fabrics." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/66085466852756313324.
Full textSu, David, and 蘇育才. "A STUDY OF SUITABILITY OF SCREEN PRINTING ON MEDICAL POLYURETHANE FOAM." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/23442098592862453255.
Full text世新大學
圖文傳播暨數位出版學研究所(含碩專班)
95
The printed manufacture of the medical apparatus belonged to one of a more special circle of a printing industry. For the cloth on the medical air cushion bed, the artificial cloth coating the Foaming Polyurethane. To research for the suitableness of applied to halftone printing. To find out a better printing suitableness matched with a safety standard and medical apparatus. According to three tests for the printed material as below: printing ink peeled off test, alcohol-resistant test and 95oC high-temperature ageing water-washes test, proceeded the following variables: to allocate the percentage of ink and assistant, to change the temperature and speed of dry an ink to find out a better way to fit for a mass product. 1. Peel off degree: According to an experiment, we found to control the following two conditions then we could get the best adhered ability and the shrinkage of cloth could be in the limitation tolerance. (a) To bake it and control the temperature between 50 oC ~ 60 oC. (b) To control the dry speed between 1 M/min ~ 1.5 M/min. 2. Alcohol-resistant: The data which was paired by intersected a baked temperature and speed can temporary dry the surface of printing ink in the experiment. (It will be slowly dried inside depended on the static placed time.) So the dry surface didn’t be destroyed when we wiped it with alcohol. Therefore it can be pass the Alcohol-resistant test. 3. High-temperature ageing water-washes: It was required that ink did not fall off after water-washes for 20 times at 95 oC. We knew we had to add a hardener into the printing ink in order to get the best adhered ability. The ratio was Ink : Slow-Dry Solvent : Hardener = 10 : 1 : 1 For the monochroic print, there was obviously variation after two days. So it could reach the request of the experiment. For the piles of color print, it would better control the printing time-gap of the fore and hind colors within 4 hours. And it was placed statically for more than 2 days after print. Therefore it could match with the request. To sum up all results as the above, we knew - to control the baked temperature between 50 oC and 60 oC - to control the baked speed between 1 M/min and 1.5 M/min - to add Hardener into Ink. Ratio: Ink : Solvent : Hardener = 10 : 1 : 1 - to control the printing time-gap of the fore and hind colors within 4 hours for the piles of color printing - to place statically for more than 2 days after print. then we can got the best adhered effect.
Wang, Shang-Tong, and 王上通. "Improving Form-Printing Software Maintenance by Maintenance-Oriented Design." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85022192903962741134.
Full text國立中興大學
資訊網路多媒體研究所
100
Software maintenance cost has always accounted for a large share of total software cost. Study has shown that optimizing software maintenance should begin at the software planning phrase by evaluating the software maintenance problems. The main goal is to improve software maintainability and to reduce the probability of maintenance requirements. Yet most mathematic researches in the past had focused on managing software maintenance after its occurrence. The tasks associated with software maintenance can be divided into corrective maintenance caused by errors in software construction, or adaptive and comprehensive maintenance needed for software that can yet accommodate future technical requirements. Errors in software construction can be effectively corrected via software engineering; it is the insufficient software adaptability that requires the most maintenance, and there is a lack of research and useable techniques associated with this problem. The purpose of maintenance-oriented design is to reduce the occurrence of software maintenance to optimize the goal of software maintenance engineering. User experiences are analyzed to offset the inability to identify every possible demand by the users. Software maintenance occurrences are reduced and means of resolving the problems are provided based on sample occurrences that have occurred. The common mandatory basic functions are then selected and pre-established in the software system to strengthen software adaptability. Information and software structures are then generically designed so that information processing signs and functions are separately composed. This way it would be easier to maintain software structure, information processing can be generically designed, and users would be allowed to customize the user interface for information processing. Customization can better satisfy user need, and these methods will help reduce the occurrence of software maintenance. This study utilized maintenance-oriented design and tested using generic form-printing software. The result showed that generically designed form-printing software can process the items to be printed without constraints, and would only require software maintenance when information processing ability is sufficient for unknown form formats, as new capability would have to be added to process that information. This type of design can reduce both the probability and cost of software maintenance.
Nascimento, Nuno Alexandre Mota Ferreira Pereira. "Numerical and Experimental Analysis of Polymeric Foams obtained by 3D Printing (Additive Manufacturing)." Master's thesis, 2019. https://hdl.handle.net/10216/122455.
Full textAbd, El Kader Magdy Ezzat. "Application of Hot-Melt Ink Jet Processes for Imaging at Offset Printing Form Cylinder." Doctoral thesis, 2003. https://monarch.qucosa.de/id/qucosa%3A18099.
Full textDer Fortschritt im Bereich von Charakterisierung und Verständnis für Hot-melt Ink Jet Prozesse zur Bebilderung von Offsetdruckform-Zylindern ist ein Ergebnis dieser Forschung. Die Systematik dieser Arbeit basiert auf einem theoretischen Teil, um einen geeigneten Löschprozess auszuwählen. Der Löschprozess hängt von den Eigenschaften des Hot-melt Ink Jet Materials und der genutzten Aluminiumdruckoberfläche ab. Diese werden systematisch im Labormaßstab experimentell untersucht. Der thermische Prozess wurde einerseits durch Benetzbarkeitsprüfungen und anderseites durch Rasterelektronmikroskopaufnahmen bewertet.Der Ultraschallprozess ist ein nasser Löschprozess. Die Untersuchungen wurden in vier Stufen systematisch durchgeführt - Auswahl vom geeigneten Lösungsmitteln - Einflüsse von ausgewählten Lösungsmitteln auf nicht beschichtete und beschichtete Aluminium platten - Evaluation eines Ultraschalllöschprozesses - Validation eines Löschprozesses; zur Bewertung des Löschprozesses wurden mehrere Druckplattenproben bebildert und gelöscht Die Ergebnisse wurden durch UV/Vis Spektrometer, Kontaktwinkel, Profiliometrie und Visuelle Mikroskopie getestet.
Abd-el-Kader, Magdy Ezzat [Verfasser]. "Application of hot melt ink jet processes for imaging at offset printing form cylinder / vorgelegt von Magdy Ezzat Abd El Kader." 2004. http://d-nb.info/970645775/34.
Full textTrnovec, Bystrik. "Experimentelle Untersuchungen zur Schichtbildung im Tiefdruck mittels hydrophobierter Druckform mit Applikationsbeispielen aus dem Bereich der gedruckten OPV." Doctoral thesis, 2013. https://monarch.qucosa.de/id/qucosa%3A20554.
Full textIn this work is described experimental research about layer forming from non-Newtonian fluids in gravure printing on non-porous substrates. The viscous fingering, caused through fluid dynamics at splitting of printed material should be decreased by hydrophobic-surface modification of gravure printing form. The aim was to print wave-free homogenous layers. To achieve comparable results, modified and pure form were used simultaneously to print the same material. The printed material was mainly PEDOT:PSS and other, which is used in printed electronics. The properties (surface tension, viscosity) of printed materials were varied by additives. Printing conditions were varied too. The characteristic of printed layers were studied: resistivity, roughness, density, etc. The results shows decreasing of waviness, roughness and viscous fingering in final layer through use of hydrophobic gravure printing form, compared to print results with common printing form. This can be applied not only in the field of printed electronics.