Дисертації з теми "Processing characteristics of the manufacturing"
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Mohamad, Khan Shah Fenner. "Novel indirect additive manufacturing for processing biomaterials." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/3022.
Повний текст джерелаАнотація:
The aim of this work was to identify methods for the production of patient-specific biomedical devices via indirect additive manufacturing (AM) methods. Additive manufacturing has been shown to provide a good solution for the manufacture of patient specific implants, but in a limited range of materials, and at a relatively high cost. This research project considered what are known as “indirect” AM approaches, which typically consider AM in combination with one or more subsequent processes in order to produce a part, with a maxillofacial plate and mandible resection used as a demonstrator application. Three different approaches were considered: (i) using AM to produce moulds for powder pressing of bioceramic green parts for subsequent sintering; (ii) using AM to produce moulds for biopolymer sintering; and (iii) 3D printing of bioceramic powders into green parts for subsequent sintering. Apatite wollastonite glass ceramic (AW) and poly-Lactide-co-glycolide (PLGA) were selected as the bioceramic and biopolymer materials to process. These were characterised before and after processing in order to ensure that the processing route did not affect the material properties. Geometric dimensions, the morphological structure and mechanical properties were studied to establish the accuracy, shrinkage and strength of the fabricated biomaterial implants. The use of AM processes to produce moulds for PLGA sintering, and the 3D printing of bioceramic powders formed the best overall results in terms of the definition and properties of the manufactured parts. Parts produced were accurate to within 5% of the as designed dimensions for both the PLGA sintering and the bioceramic powders 3D printing. The indirect AM methods are considered to be promising processing routes for medical devices.
2
Ramudhin, Amar. "Two-stage manufacturing processes." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/24561.
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Kebede, Selamawit. "Utilisation of MIS in manufacturing industries." Thesis, Cape Technikon, 2001. http://hdl.handle.net/20.500.11838/2294.
Повний текст джерелаАнотація:
Thesis (MTech (Information Technology))--Cape Technikon, 2001.Management information systems can be defined as information systems using formalised procedures to provide managers at all levels, in all functions, with appropriate information from all relevant sources, to enable them to make timely and effective decisions for which they are responsible. There is, and continues to be, an awareness in society that accurate and timely information is a vital resource of any organisation, and that an effective management information system is a means of providing the needed information. Many top management people are finding that information is a source of competitive power. It gives them the ability to out-manoeuvre their rivals at critical times, especially when introducing new products. Effective management information systems allow the decisionmaker (i.e .. the ll;)Ul:lger) to combine his or her subjective experience with computerised objective output to produce meaningful information for decision making (Thierauf, 1984:22). Managers must also learn how to state their wishes with precision. Management information systems (MIS) produce only what is asked, which may not be at all what is required. For effective use of information technology, managers must be able to define their information requirements as well as understand computer capabilities and limitations (Hussain and Hussain, 1995:8). The primary objective of this research was to establish the impact of utilising management information systcn»: (MIS) and applying information technology on the success of manufacturing industries. The other aim of the study was to investigate the extent of utilising management information systems and applying information technology in these industries. The study focused on medium- and large-scale chemical manufacturing companies in the Cape Metropole area that have operated for at least the past five years.
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Hawisa, Hisham. "Management of manufacturing variation using product key characteristics." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421488.
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Moi, Havard. "Rule-based control of manufacturing systems." Thesis, Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22190168.
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Schlechter, E. J. (Emile Johan). "Manufacturing intelligence : a dissemination of intelligent manufacturing principles with specific application." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52927.
Повний текст джерелаАнотація:
Thesis (MEng)--University of Stellenbosch, 2002.ENGLISH ABSTRACT: Artificial intelligence has provided several techniques with applications in manufacturing. Knowledge based systems, neural networks, case based reasoning, genetic algorithms and fuzzy logic have been successfully employed in manufacturing. This thesis will provide the reader with an introduction and an understanding of each of these techniques (Chapter 2 & 3). The intelligent manufacturing process can be a complex one and can be decomposed into several components: intelligent design, intelligent process planning, intelligent quality management, intelligent maintenance and diagnosis, intelligent scheduling and intelligent control. This thesis will focus on how each of the artificial intelligence techniques can be applied to each of the manufacturing process fields. Chapter 5 Chapter 6 Chapter 7 Knowledge based systems Neural networks Fuzzy logic Case based reasoning Genetic algorithms Chapter 8 Chapter 9 Chapter 10 Manufacturing intelligence can be approached from two main directions: theoretical research and practical application. Most of the concepts, methods and techniques discussed in this thesis are approached from a theoretical research point of view. This thesis is also aimed at providing the reader with a broader picture of manufacturing intelligence and how to apply the intelligent techniques, in theory. Specific attention will be given to intelligent scheduling as an application (Chapter 11). The application will demonstrate how case based reasoning can be applied in intelligent scheduling within a small manufacturing plant.
AFRIKAANSE OPSOMMING: Kunsmatige intelligensie bied 'n verskeidenheid tegnieke en toepassings in die vervaardigingsomgewing. Kennis baseerde sisteme, neurale netwerke, gevalle basseerde redenasie, generiese algoritmes en wasige logika word suksesvol in die vervaardigingsopset toegepas. Dié tesis gee die leser 'n inleiding en basiese oorsig van metodes om elk van die tegnieke te gebruik (hoofstuk 2 & 3). Die intelligente vervaardigingproses is 'n komplekse proses en kan afgebreek word in verskeie komponente: intelligente ontwerp, intelligente prosesbeplanning, intelligente gehaltebestuur, intelligente onderhoud en diagnose, intelligente kontrole en intelligente skedulering. Hierdie tesis sal fokus op hoe elk van die kunsmatige intelligente tegnieke op elk van die vervaardigingprosesvelde toegepas kan word. Hoofstuk 5 Hoofstuk 6 Hoofstuk 7 Kennis gebaseerde sisteme Wasige logika Neurale netwerke Gevalle baseerde redenasie Generiese algoritmes Hoofstuk 8 Hoofstuk 9 Hoofstuk 10 Vervaardigingsintelligensie kan vanuit twee oogpunte benader word, naamlik 'n teoretiese ondersoek en 'n praktiese aanslag. Die meeste van hierdie konsepte, metodes en tegnieke word in hierdie tesis vanuit 'n teoretiese oogpunt benader. Die tesis is daarop gerig om die leser 'n wyer perspektief te gee van intelligente vervaardiging en hoe om die intelligente tegnieke, in teorie, toe te pas. Spesifieke aandag sal gegee word aan intelligente skedulering as 'n toepassing (Hookstuk 11). Die toepassing sal demonstreer hoe gevalle baseerde redenasie toegepas kan word in intelligente skedulering.
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Silva, Rinaldo J. "Information processing in designing manufacturing systems with material handling." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/25110.
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Taylor, Simon. "The application of parallel processing to manufacturing systems simulation." Thesis, Leeds Beckett University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343240.
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Jang, Young Jae 1974. "Multiple part type decomposition method in manufacturing processing line." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/89318.
Повний текст джерелаАнотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2001."June 2001."
Includes bibliographical references (leaf 67).
by Young Jae Jang.
S.M.
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Kwok, Kwok-tung, and 郭國棟. "Hierarchical slice contours for layered manufacturing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224544.
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Domann, Michael. "Characteristics of spray unsteadiness." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268873.
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Chandran, Sarath, and Mathews Jithin Abraham. "Simulation and Optimization of CNC controlled grinding processes : Analysis and simulation of automated robot finshing process." Thesis, Högskolan i Halmstad, Maskinteknisk produktframtagning (MTEK), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-30709.
Повний текст джерелаАнотація:
Products with complicated shapes require superior surface finish to perform the intended function. Despite significant developments in technology, finishing operations are still performed semi automatically/manually, relying on the skills of the machinist. The pressure to produce products at the best quality in the shortest lead time has made it highly inconvenient to depend on traditional methods. Thus, there is a rising need for automation which has become a resource to remain competitive in the manufacturing industry. Diminishing return of trading quality over time in finishing operations signifies the importance of having a pre-determined trajectory (tool path) that produces an optimum surface in the least possible machining time. Tool path optimization for finishing process considering tool kinematics is of relatively low importance in the present scenario. The available automation in grinding processes encompass around the dynamics of machining. In this paper we provide an overview of optimizing the tool path using evolutionary algorithms, considering the significance of process dynamics and kinematics. Process efficiency of the generated tool movements are studied based on the evaluation of relative importance of the finishing parameters. Surface quality is analysed using MATLAB and optimization is performed on account of peak to valley height. Surface removal characteristics are analysed based on process variables that have the most likely impact on surface finish. The research results indicated that tool path is the most significant parameter determining the surface quality of a finishing operation. The inter-dependency of parameters were also studied using Taguchi design of experiments. Possible combinations of various tool paths and tool influencing parameters are presented to realize a surface that exhibits lowest errors.European Horizon 2020 Project SYMPLEXITY
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Isaieva, O. A., and О. Г. Аврунін. "Image processing for video dermatoscopy." Thesis, Osaka, Japan, 2019. http://openarchive.nure.ua/handle/document/10347.
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Vaidya, Rohit R. "Image Processing (IP) Assisted Tools for Pre- and Post-Processing Operation in Additive Manufacturing (AM)." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470757856.
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Burke, Karen. "Semi-solid processing of aluminium 7075." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284764.
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Wong, Yiu-chung. "Outward processing in China and its implications to the economy of Hong Kong." Click to view the E-thesis via HKUTO, 1989. http://sunzi.lib.hku.hk/hkuto/record/B43893260.
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Boddapati, Venkata-Sandeep. "Exergy metric for the assessment of material processing in manufacturing." Lexington, Ky. : [University of Kentucky Libraries], 2006. http://lib.uky.edu/ETD/ukymseg2006t00493/thesis.pdf.
Повний текст джерелаАнотація:
Thesis (M.S.)--University of Kentucky, 2006.Title from document title page (viewed on October 31, 2006). Document formatted into pages; contains: xv, 138 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 134-137).
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Boddapati, Venkata Sandeep. "EXERGY METRIC FOR THE ASSESMENT OF MATERIAL PROCESSING IN MANUFACTURING." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_theses/377.
Повний текст джерелаАнотація:
Exergy utilization calculations have been in the past repeatedly used to quantify the quality and quantity of energy used in thermal energy processes. This thesis is an attempt to derive a common language exergy utilization and compare for the first time two entirely different manufacturing processes, namely material processing by a mechanical method of straining of the material and simple heating of the same mass of the material using exergy utilization as a metric. The exergy utilization of material processing is determined by performed work and utilized heat transfer using 1) Ramberg-Osgood equation and 2) Lumped heat capacitance method. A comparison of these two methods is presented.
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Walde, Caitlin. "Thermal Processing of Powder Aluminum Alloys for Additive Manufacturing Applications." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/498.
Повний текст джерелаАнотація:
For additive manufacturing, research has shown that the chemistry and microstructural properties of the feedstock powder can significantly affect the properties of the consolidated material. Thermal treatment and recycling parameters for powders used in both solid and liquid state processes can further affect the microstructure and properties of the consolidated parts. Understanding the powder microstructure and effects of powder pre-treatment can aid in optimizing the properties of the final consolidated part. This research proposes a method for the characterization and optimization of powder pre-processing thermal parameters using aluminum alloy powder as examples. Light microscopy, electron microscopy, and hardness were used to evaluate each condition.
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Derksen, Timothy J. (Timothy John). "Processing of outliers and missing data in multivariate manufacturing data." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38800.
Повний текст джерелаАнотація:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.Includes bibliographical references (leaf 64).
by Timothy J. Derksen.
M.Eng.
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Yeung, Ka-wing Ricky, and 楊家榮. "IT implementation in small and medium manufacturing enterprises." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31268432.
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O'Leary, Emily. "Cognitive processing characteristics in obsessive-compulsive disorder subtypes." Thesis, University of Canterbury. Psychology, 2005. http://hdl.handle.net/10092/1359.
Повний текст джерелаАнотація:
Obsessive Compulsive Disorder (OCD) is classified as an anxiety disorder characterized by distressing persistent unwanted ideas or impulses (obsessions) and urges and/or compulsion to do something to relieve the associated anxiety caused by the obsession. The thematic content of the obsessions are highly variable, ranging from symmetry, contamination to aggressive concerns. Compulsions tend to be linked to the obsessions, but can also be idiosyncratic to the intrusive thought. According to the cognitive model, Obsessive-compulsive disorder (OCD) is maintained by various belief factors such as an inflated sense of responsibility, overestimation of threat and the over-control of thoughts. Despite much support for this hypothesis, there is a lack of specificity. This series of studies sought to determine the relationship between a number of cognitive beliefs and appraisal processes and obsessive-compulsive symptoms. This thesis presents the results of three studies. The first study was designed to investigate the hypothesis that certain beliefs are more prevalent in OCD, compared with other anxiety disorders. The second study expands on earlier findings by examining whether the six metacognitive beliefs proposed by the Obsessive Compulsive Cognitions Working Group, (OCCWG; 1997, 2001, & 2003) correlate with specific symptom-based OCD subtypes. The final study addresses some of the methodological weaknesses inherent in retrospective self-report measures by replicating the study using experimental techniques. Most importantly, this research was conducted from within the theoretical framework of Rachman (1993) and Salkovskis (1989) models which emphasise the misinterpretation of significance of the intrusive thoughts. The first study explored the relationship between thought-action fusion (TAF) and inflated responsibility beliefs across individuals diagnosed with obsessive compulsive disorder (OCD), an anxiety disorder other than OCD (anxious controls; AC), and a non-anxious control group (NAC). It was hypothesized that the OCD group would evidence significantly higher inflated responsibility and TAF scores, compared to the AC and NAC groups. In this study, non-clinical and clinical participants were recruited for research. The non-clinical group was comprised of undergraduate students (n = 22: mean age = 26.8; SD = 9.2). The clinical groups included 20 participants with OCD as their primary diagnosis (mean age = 32.1; SD = 11.9) and 21 individuals diagnosed with another anxiety disorder (mean age = 32.2; SD = 10.9). To measure inflated responsibility beliefs and thought action fusion, self-report questionnaires were administered to the participants. The results of this study demonstrated that inflated responsibility beliefs, while present in other anxiety disorders, were significantly higher in participants with OCD, even after controlling for depressed mood and TAF levels. No group differences emerged between the OCD and anxious groups on measures of TAF. Thus, it can be tentatively concluded that inflated responsibility beliefs may have a more robust relationship with OCD than TAF beliefs, which appear to act as a general vulnerability factor occurring along a continuum of anxiety disorders. The second study examined the associations between the six OCD-related beliefs: control of thoughts, importance of thoughts, responsibility, intolerance of uncertainty, overestimation of threat and perfectionism and five empirically derived OCD subgroups. Clinical participants with a primary diagnosis with OCD (n = 67: mean age = 38.0; SD = 11.7) were recruited over a period of two years from the Anxiety Disorders Unit. Participant responses were cluster analysed to form five stable groups: aggressive obsessions-checking compulsions (n = 22: mean age = 26.8; SD = 9.2); contamination obsessions-cleaning compulsions (n = 22: mean age = 26.8; SD = 9.2); symmetry concerns-ordering/arranging compulsions (n = 22: mean age = 26.8; SD = 9.2); hoarding obsessions-hoarding compulsions (n = 22: mean age = 26.8; SD = 9.2); and miscellaneous obsessions -miscellaneous compulsions (n = 22: mean age = 26.8; SD = 9.2). The second found that intolerance of uncertainty was significantly related to the contamination subgroup. While responsibility and threat estimation beliefs were higher in the aggressive-checking subgroup, these differences did not reach statistical significance. No other significant results were found, however, there was a non-significant trend for perfectionism beliefs to be higher in symmetry-ordering and hoarding subgroup. Following the results of this study, questions remained about whether the lack of significant findings reflected the generality of these beliefs or were due to methodological differences. This led to the development of the final study presented in this thesis. The purpose of the final study was to investigate whether the second study was limited by the method of assessment (e.g. self-report questionnaires). This study was unique, as it was the first of its kind to experimentally manipulate all six beliefs in empirically derived OCD subtypes. Twenty participants (mean age = 45.0; SD = 11.0) were chosen from the second study to form the following priori groups: contamination (n = 4: mean age = 44.5; SD = 9.5); aggressive (n = 6: mean age = 46.5; SD = 7.2); hoarding (n = 4: mean age = 47.2; SD = 6.9); and symmetry (n = 6: mean age = 41.8; SD = 17.4). Six behavioural experiments designed to reflect one of the six OCCWG beliefs were specifically developed and administered to the groups. Baseline scores were obtained using self-report questionnaires. The study found strong support for the use of experimental paradigms over self-report measures, as several significant interactions between cognitive beliefs and OCD symptom-based subtypes were found. Specifically, the hoarding subgroup evidenced significantly higher overall thought action fusion scores compared to those in the contamination group. The symmetry subgroup exhibited significantly higher anxiety than the aggressive group during the perfectionism task and demonstrated significantly higher scores on several items measuring perfectionism compared to the contamination group. Finally, over-estimation of threat beliefs was significantly higher in the contamination thoughts. No statistically significant group differences were found for controllability of thoughts, responsibility and intolerance of uncertainty. In conclusion, these studies collectively showed that in some cases of OCD certain beliefs appear highly applicable, whereas in others they are not. This finding may explain why some OCD patients have poor treatment outcomes as the beliefs and appraisals were highly variable across groups. These findings are of both theoretical and clinical significance because they add to the growing understanding that OCD may consist of distinct clusters of symptoms with different underlying motivations and beliefs. This finding is of clinical significance because treatment guidelines for OCD can become more specific, factoring into the therapy situation these underlying beliefs and appraisal processes. Lastly, the findings regarding inflated responsibility deserve special mention, given the significance of this construct in contemporary cognitive models. The results of the present studies were mixed with regard to responsibility as only the first study found a significant result. It appears that, like the other belief domains proposed by the OCCWG, responsibility may not be specific to all types of OCD and current cognitive models may benefit was shifting the emphasis to other belief domains.
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Rasid, Rozaidi. "Effect of processing variables on the extruder characteristics." Thesis, University of Manchester, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493730.
Повний текст джерелаАнотація:
In this work, temperature profiles, velocity profiles and other parameters such as output rate, pressure, and power consumption were investigated under various processing variables/conditions. The measurements were carried out using an apparatus attached to the output end of an extruder. The effect of processing variables such as screw speed, barrel and apparatus temperatures, die types and die geometries were studied in this work. An investigation was also carded out to study the effect of a breaker plate on the parameters mentioned above. The measurements were also carried out at various points along the length of the apparatus. The technique called Modified CST (Cooled-Stainless Tube), coupled with a temperature measurement sensor (thermocouple mesh) was, used to simultaneously measure the temperature and velocity profiles at multiple points across the diameter of the duct. The measurements were taken using high speed data acquisition equipment (ADU) which was connected to a person"! l computer. The technique used was evaluated and discussed, and it was found that the technique used gives accurate and repeatable measurements at low cost. In order to assist the interpretation of the data generated, rheological and thermal characterisations were carded out on the material used (LDPE10OBWExxon Chemical). Rheological characterisation was carried out using a capillary rheometer and a high shear viscometer. The melt density at a range of temperatures was measured using a melt index tester. The relationship between pressure, density and temperature was studied using a sample of fixed density inside a chamber of fixed volume at various temperatures. Thermal conductivity was measured using a modified Lee's Disc apparatus. Other thermal properties such as melting temperature, the degree of crystallinity, specific heat were determined using Differential Scanning Calorimetry (DSC). Using the specific heat value generated from DSC, combined with thermal conductivity and density value, thermal diffusivity was calculated. Experimentally, it has been found that the temperature profiles varied with the processing variables used. The profiles were related to the melting process inside the extruder, shear heating effects, conduction effects, residence time of the melt inside the equipment and the thermal/rheological characteristics of the polymer used. The velocity profiles, however, did not directly correlate with the temperature profiles, the profiles being related to the effect of the screw speed, screw tip and die entrance. Apart from screw speed, the power consumption was found to be determined by the power required during melting process. It was also found that the flow inside the apparatus duct was steady and laminar, the temperature and velocity profiles developing over the length of the duct.
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Arora, Bholan Ruby. "Processing behaviour of NR latex, with special reference to dipping." Thesis, London Metropolitan University, 1990. http://repository.londonmet.ac.uk/3379/.
Повний текст джерелаАнотація:
A detailed study of the effect of added ingredients upon processing behaviour of NR latex with reference to dipping has been conducted in an endeavour to further understanding of the fundamental science underlying latex dipping processes.
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Rudraraju, Anirudh V. "Digital data processing and computational design for large area maskless photopolymerization." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52930.
Повний текст джерелаАнотація:
Large Area Maskless Photopolymerization (LAMP) is a novel additive manufacturing technology currently being developed at Georgia Tech in collaboration with the University of Michigan at Ann Arbor and PCC Airfoils. It is intended for the fabrication of integrally cored ceramic molds for the investment casting of precision components such as high-pressure turbine blades. This dissertation addresses the digital data processing and computational design needs for this technology. Several data processing schemes like direct slicing, STL slicing, post-processing schemes like error checking, part placement and tiling etc. were developed in order to enable the basic functionality of the LAMP process. A detailed overview of these schemes and their implementation details are given in this dissertation. Several computational schemes to improve the quality and accuracy of parts produced through the LAMP process were also implemented. These include a novel volume deviation based adaptive slicing method to adaptively slice native CAD models, a gray scaling and dithering approach to reduce stair stepping effect on downward facing surfaces and a preliminary experimental study to characterize the side curing behavior of the LAMP photo-curable suspension for pre-build image compensation. The implementation details and a discussion of the results obtained using these schemes are given. A novel approach for addressing the “floating island” problem encountered in additive manufacturing was also developed. The need for supports specific to the kind of parts being built through LAMP is evaluated and a support generation strategy different from the previously reported approaches in the literature is presented. Finally, a few novel film cooling schemes that are extremely challenging to fabricate using existing manufacturing technologies but possible to fabricate using LAMP are chosen and analyzed for their cooling performance. It is shown that such novel schemes perform much better in cooling the blade surface than the conventionally implemented schemes and hence this final component of work gives a better appreciation of the impact LAMP technology has in disrupting the state of the art in turbine blade manufacturing and truly taking the blade designs to the next level.
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Saldivar-Sali, Charisse Domingo. "Host country characteristics and manufacturing decisions : discovering influences and relationships." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311105.
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Ren, Guangjie. "Service business development in manufacturing companies : classification, characteristics and implications." Thesis, University of Cambridge, 2009. https://www.repository.cam.ac.uk/handle/1810/252148.
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Marshall, Simon. "The generation of machine tool cutter paths utilising parallel processing." Thesis, University of Hull, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287912.
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Pongpattanasili, Chaitamlong. "An appropriate manufacturing strategy model for the Thai food processing industry." Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070215.170406/index.html.
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Egan, M. J. "Spiral growth manufacture : a continuous additive manufacturing technology for powder processing." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491352.
Повний текст джерелаАнотація:
Layered manufacturing (LM) technologies are a class of additive manufacturing processes which create three dimensional geometries directly from CAD data sequentially layer by layer. This group of technologies can process a variety of metallic, polymer and ceramic materials, as liquids, powders, or solid sheets or filaments. The material can be processed using a laser, such as melting a powder or curing a polymer resin or consolidated using a binder deposited from a print head. The build methodology used in all LM is fundamentally a start-stop process since the deposition of material and processing of each layer occurs ~equentially. Hence, the build rate can be slow (2 - 6 Layers per minute); consequently, LM technologies have largely found application as prototyping tools to speed up product development. In order for these technologies to be adopted as rapid manufacturing (RM) methods to directly manufacture complex components which cannot be manufactured by other means these speed limitations need to be addressed. This Thesis describes a new high speed RM process, Spiral Growth Manufacturing (SGM), whereby 3D parts are built by simultaneously depositing, levelling and selectively consolidating thin powder layers onto a rotating build platform. This build configuration has several advantages when compared to conventional layered manufacturing systems: firstly, the process is continuous with no layer preparation overheads; secondly, the material deposition and solidification process can be performed simultaneously by the addition of further 'build stations' radially distributed about the circumference of the machine. The work presented in this thesis focused on the design, development and testing ofthe Spiral Growth Manufacturing process. Two machines were developed; one used a bank of stationary inkjet heads to print material, either as a binder into a powder layer or as hard material from mixing two printed ink solutions and the other machine used a 90 W, flash lamp pumped Nd:YAG laser to process metal powders by localised melting. The main objective ofthe testing phase was to produce simple 3D objects from solidified layers by: a) ink jet printing a binding agent into the deposited plaster powder layers; and b) ink jet printing reactive materials to form plaster directly. The second machine was developed to exploit the considerable knowledge of Selective Laser Melting (SLM) at Liverpool, with the modification of a research SLM machine to SGM operation.
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Ghalsasi, Omkar. "An Image Processing-based Approach for Additive Manufacturing of Cranial Implants." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1623169593210198.
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Tarr, Eric William. "Processing Perceptually Important Temporal and Spectral Characteristics of Speech." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376913300.
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Eddiyanto, E. "Functionalisation of polymers: reactive processing, structure and performance characteristics." Thesis, Aston University, 2007. http://publications.aston.ac.uk/9805/.
Повний текст джерелаАнотація:
The main aim of this work was to study the effect of two comonomers, trimethylolpropane trimethacrylate (TRIS) and divinylbenzene (DVB) on the nature and efficiency of grafting of two different monomers, glycidyl methacrylate (GMA) and maleic anhydride (MA) on polypropylene (P) and on natural rubber (NR) using reactive processing methods. Four different peroxides, benzoyl peroxide (BPO), dicumyl peroxide (DCP), 2,5-dimethyl-2,5-bis-(tert-butyl peroxy) hexane (t-101), and 1,1-di(tert-butylperoxy)-3,3,5-trimethyl cyclohexene (T-29B90) were examined as free radical initiators. An appropriate methodology was established and chemical composition and reactive processing parameters were examined and optimised. It was found that in the absence of the coagents DVB and TRIS, the grafting degree of GMA and MA increased with increasing peroxide concentration, but the level of grafting was low and the homopolymerisaton of GMA and the crosslinking of NR or chain scission of PP were identified as the main side reactions that competed with the desired grafting reaction in the polymers. At high concentrations of the peroxide T-101 (>0.02 mr) cross linking of NR and chain scission of PP became dominant and unacceptable. An attempt to add a reactive coagent, e.g. TRIS during grafting of GMA on natural rubber resulted in excessive crosslinking because of the very high reactivity of this comonomer with the C=C of the rubber. Therefore, the use of any multifunctional and highly reactive coagent such as TRIS, could not be applied in the grafting of GAM onto natural rubber. In the case of PP, however, the use of TRIS and DVB was shown to greatly enhance the grafting degree and reduce the chain scission with very little extent of monomer homopolymerisation taking place. The results showed that the grafting degree was increased with increasing GMA and MA concentrations. It was also found that T-101 was a suitable peroxide to initiate the grafting reaction of these monomers on NR and PP and the optimum temperature for this peroxide was =160°C. A very preliminary work was also conducted on the use of the functionalised-PP (f-PP) in the absence and presence of the two comonomers (f-PP-DVB or f-PP-TRIS) for the purpose of compatibilising PP-PBT blends through reactive blending. Examination of the morphology of the blends suggested that an effective compatibilisation has been achieved when using f-PP-DVB and f-PP-TRIS, however more work is required in this area.
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Duttala, Satish. "Virtual material processing artificial intelligence based process selection." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1174590077.
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Keser, Ozge. "Modeling A Modern Marble Processing Plant By Using Petri Net." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12604776/index.pdf.
Повний текст джерелаАнотація:
ABSTRACT
MODELING A MODERN MARBLE PROCESSING PLANT BY USING
PETRI NET
Keser, Özge M. Sc., Department of Mining Engineering Supervisor: Prof Dr. NeS&rsquo
e Ç
elebi Co-Supervisor: Prof Dr. Tevfik Gü
yagü
ler December 2003, 110 pages All developing countries need sufficient raw material resources to develop and to guarantee their future. Considering Turkish natural resources, marble has a great importance because of its demand on the market, reserve amount and quality. However, some effort is required to improve the existing marble production and processing efficiency. Petri nets (PNs) are the information models that control the flow for concurrent and synchronous systems. In this regard, PN application can be useful. However, its application is limited to the complex systems and no application of PN is available in mining sector. iii In this sense, this study aims to examine the applicability of PN to mining. This study examines the production system in order to optimize the process in case of two different types of marble product orders. Three case studies are applied to examine benefits and difficulties in implementation of PN to a marble processing plant. The study shows that PN can successfully be used as a tool for the optimization of total production time, simulation and modeling of the system. It provides to see the sequence of the processes, their time, remaining time of each transition and optimum total production times. The difficulties of PN implementation are found out as the determination of each path in the reachability graph, matrix representation with large quantity of place, etc.
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Kaulich, Florian, Ralph Luken, Alois Mhlanga, and Ingrid Polzerova. "Energy intensity and manufacturing firm characteristics in Sub-Saharan African countries." Inclusive and Sustainable Development Working Paper Series 16/2016, United Nations Industrial Development Organization, 2016. http://epub.wu.ac.at/5345/1/Kaulich_Luken_Mhlanga_Polzerova_2016_(UNIDO_WP_v2)_%2D%2D_Energy_Intensity_and_Manufacturing_Firm_Characteristics_in_Sub%2DSaharan_African_countries.pdf.
Повний текст джерелаАнотація:
We draw on a unique dataset for energy use by manufacturing firms in 18 Sub-Saharan African countries to estimate the relationship between energy intensity of production and firms' characteristics. Our results show that lower levels of energy intensity are associated with export activity, foreign ownership, size and capital-labor ratio, while higher levels of energy intensity are associated with a higher share of fuels in total energy consumption. We do not find a statistically significant relationship between energy intensity and the age of capital equipment or ownership of a generator, while our results on quality management certification are inconclusive.
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Gu, Xin. "Directed melt oxidation of aluminium : processing and microstructure relationships." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388706.
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Ho, Kin-wing Oscar, and 何建榮. "Development of RFID-enabled workstation gateway for real-time manufacturing execution." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43572029.
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Aghajani, Hamed. "Modelling the initial spray characteristics of fire sprinklers." Thesis, Kingston University, 2013. http://eprints.kingston.ac.uk/27787/.
Повний текст джерелаАнотація:
Sprinklers are automatically activated fixed installation suppression devices. They have found extensive applications due to minimum protection they provide for a wide range of applications including residential and warehouses. Modelling sprinkler atomization is a challenging task, due to the stochastic nature in impingement of water jets and the added complexity of sprinkler configuration. In the literature, a spray initiation framework has been developed to address the multidimensional stochastic complexity associated with fire sprinklers. The initial sprinkler spray is completely characterized in terms of the following main parameters: droplet spatial location (radius, elevation angle and azimuthal angle), droplet velocity, droplet diameter and the spatial volume flux. The present thesis aims to improve the prediction of the initial sprinkler spray characteristics through exploring different physics based modelling approaches. The sub-models for film flow and sheet trajectory adopted in the development of the fire sprinkler spray models are reviewed. Three new deterministic approaches for sprinkler atomization have been proposed by employing an existing film submodel and a detailed water sheet trajectory sub-model which has never been used for fire sprinkler applications. The developed methods simulate the orthogonal impingement of water jet to a deflecting disk, with the potential to be adapted for tilted deflectors. A comparative analysis is carried out between the three introduced methods and a reference model in terms of their predictions for droplet median diameter and initial droplet location for a range of ambient temperatures and water injection pressures. The developed methodologies have been further expanded by incorporating random behaviour to the spray formation procedure. The stochastically predicted mean velocity and volume median diameter have been compared against robust experimental data and empirical correlations. The improvements obtained by the developed methodologies are promising. In further steps, a dimensionless formulation for predicting spray characteristics, sheet breakup distance and droplet sizes, in impinging atomizers have been developed. The developed formulation is validated for impingements led the spray to occur in the rim breakup mode. Building on the proposed methodologies, a semi empirical model has been developed capable of predicting the near field spray characteristics such as spatial distribution of droplet sizes, velocities and spray volume flux from local volume fraction measurements. The research outcome would benefit the computation fluid dynamic packages to initialize the spray in a more realistic manner. The study undertaken would lead to more efficient fire suppression and/or water and fire interaction studies. In addition to this, the methodology could reduce the cost of experiments in order to quantify new sprinkler sprays.
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Zhu, Feng, and 朱峰. "Visualized CAD modeling and layered manufacturing modeling for components made of a multiphase perfect material." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30073844.
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Wang, Qian. "Modelling and simulation of integrated operational and information processing systems in manufacturing." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394898.
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Tanrikulu, Ahmet Alptug. "Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/4088.
Повний текст джерелаАнотація:
Titanium alloys are widely used for aerospace and biomaterial applications since their high specific strength, and high corrosion resistivity. Besides these properties, titanium is an excellent biocompatible material widely used for internal body implants. Because the products have complex geometries in both applications, Additive Manufacturing (AM) methods have been recently applied for production. AM methods can process a direct 3-D shape of the final product, decrease total production time and cost. However, high residual stress of the final product limits the application of AM components, especially the ones that are exposed to cyclic loading. In the present study, the initial microstructures and impact toughness of Ti6Al4V processed by EBM and CMT, and CP:Ti processed by SLM were experimented. In addition to initial microstructure and impact toughness, their response to different heat treatments were examined. Gleeble® 3500 was used for rapid heat treatment process. The change of mechanical properties due to different heat treatments were monitored with impact tests. Phase transformation kinetics of CP:Ti and Ti6Al4V were investigated with a Differential Scanning Calorimeter at slow heating and cooling rates. Microstructure examination was done with a scanning electron microscope. EBSD data was used to analyze the microstructure behavior. It is observed that toughness of the samples that are produced by powder-based AM methods were improved. Overall, residual stress, strain values, and grain orientation are the key elements that affected impact toughness AM produced components.
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Palanivel, Sivanesh. "Thermomechanical Processing, Additive Manufacturing and Alloy Design of High Strength Mg Alloys." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849628/.
Повний текст джерелаАнотація:
The recent emphasis on magnesium alloys can be appreciated by following the research push from several agencies, universities and editorial efforts. With a density equal to two-thirds of Al and one-thirds of steel, Mg provides the best opportunity for lightweighting of metallic components. However, one key bottleneck restricting its insertion into industrial applications is low strength values. In this respect, Mg-Y-Nd alloys have been promising due to their ability to form strengthening precipitates on the prismatic plane. However, if the strength is compared to Al alloys, these alloys are not attractive. The primary reason for low structural performance in Mg is related to low alloying and microstructural efficiency. In this dissertation, these terminologies are discussed in detail. A simple calculation showed that the microstructural efficiency in Mg-4Y-3Nd alloy is 30% of its maximum potential. Guided by the definitions of alloying and microstructural efficiency, the two prime objectives of this thesis were to: (i) to use thermomechanical processing routes to tailor the microstructure and achieve high strength in an Mg-4Y-3Nd alloy, and (ii) optimize the alloy chemistry of the Mg-rare earth alloy and design a novel rare—earth free Mg alloy by Calphad approach to achieve a strength of 500 MPa.
Experimental, theoretical and computational approaches have been used to establish the process-structure-property relationships in an Mg-4Y-3Nd alloy. For example, increase in strength was observed after post aging of the friction stir processed/additive manufactured microstructure. This was attributed to the dissolution of Mg2Y particles which increased the alloying and microstructural efficiency. Further quantification by numerical modeling showed that the effective diffusivity during friction stir processing and friction stir welding is 60 times faster than in the absence of concurrent deformation leading to the dissolution of thermally stable particles. In addition, the investigation on the interaction between dislocations and strengthening precipitate revealed that, specific defects like the I1 fault aid in the accelerated precipitation of the strengthening precipitate in an Mg-4Y-3Nd alloy. Also, the effect of external field (ultrasonic waves) was studied in detail and showed accelerated age hardening response in Mg-4Y-3Nd alloy by a factor of 24.
As the bottleneck of low strength is addressed, the answers to the following questions are discussed in this dissertation: What are the fundamental micro-mechanisms governing second phase evolution in an Mg-4Y-3Nd alloy? What is the mechanical response of different microstructural states obtained by hot rolling, friction stir processing and friction stir additive manufacturing? Is defect engineering critical to achieve high strength Mg alloys? Can application of an external field influence the age hardening response in an Mg-4Y-3Nd alloy? Can a combination of innovative processing for tailoring microstructures and computational alloy design lead to new and effective paths for application of magnesium alloys?
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Perini, Matteo. "Additive manufacturing for repairing: from damage identification and modeling to DLD processing." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/268434.
Повний текст джерелаАнотація:
The arrival on the market of a new kind of CNC machines which can both add and remove material to an object paved the way to a new approach to the problem of repairing damaged components. The additive operation is performed by a Direct Laser Deposition (DLD) tool, while the subtractive one is a machining task. Up to now, repair operations have been carried out manually and for this reason they are errors prone, costly and time consuming. Refurbishment can extend the life of a component, saving raw materials and resources. For these reasons, using a precise and repeatable CNC machine to repair valuable objects is therefore very attractive for the sake of reliability and repeatability, but also from an economical and environmental point of view. One of the biggest obstacles to the automation of the repairing process is represented by the fact that the CAM software requires a solid CAD model of the damage to create the toolpaths needed to perform additive operations. Using a 3D scanner the geometry of the damaged component can be reconstructed without major difficulties, but figuring out the damage location is rather difficult. The present work proposes the use of octrees to automatically detect the damaged spot, starting from the 3D scan of the damaged object. A software named DUOADD has been developed to convert this information into a CAD model suitable to be used by the CAM software.
DUOADD performs an automatic comparison between the 3D scanned model and the original CAD model to detect the damaged area. The detected volume is then exported as a STEP file suitable to be used directly by the CAM. The new workflow designed to perform a complete repair operation is described placing the focus on the coding part. DUOADD allows to approach the repairing problem from a new point of view which allows savings of time and financial resources.
The successful application of the entire process to repair a damaged die for injection molding is reported as a case study. In the last part of this work the strategies used to apply new material on the worn area are described and discussed. This work also highlights the importance of using optimal parameters for the deposition of the new material. The procedures to find those optimal parameters are reported, underlying the pros and cons. Although the DLD process is very energy efficient, some issues as thermal stresses and deformations are also reported and investigated, in an attempt to minimize their effects.
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王日昇 and Yat-sing Wong. "Production scheduling for virtual cellular manufacturing systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31239468.
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Samalot, Rivera Francis J. "Processing, characterization and modeling of carbon nanofiber modified carbon/carbon composites." Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2008r/rivera.pdf.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--University of Alabama at Birmingham, 2007.Additional advisors: Krishan K. Chawla, Derrick Dean, Yogesh Vohra, Mark Weaver. Description based on contents viewed Feb. 13, 2009; title from PDF t.p. Includes bibliographical references (p. 174-186).
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Zarei, Hanzaki Abbass. "Transformation characteristics of Si-Mn TRIP steels after thermomechanical processing." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41798.
Повний текст джерелаАнотація:
Thermomechanical processing, which is a combination of deformation and heat treatment, is an optimum method to control the microstructural evolution and, accordingly, to generate the desired mechanical properties of materials. TRIP (Transformation-Induced-Plasticity) behavior is a powerful mechanism with which to improve mechanical properties. The basis of TRIP behavior is the retention of austenite with optimum characteristics (volume fraction, stability, size, morphology and composition) at room temperature. The transformation of retained austenite to martensite during deformation can lead to TRIP-enhanced properties. This work deals with the effects of thermomechanical processing parameters on the microstructural characteristics of TRIP steels, primarily from the point of view of the retained austenite condition in Si-Mn and Si-Mn-Nb bearing TRIP steels. Initially, a new test technique based on continuous cooling compression (CCC) testing was developed to find the critical temperatures of thermomechanical processing (TMP). A major finding from the CCC test is the ability to determine the $Ae sb3$ (equilibrium austenite-to-ferrite transformation) temperature. In the CCC test, the $Ae sb3$ appeared to be associated with an increase in the rate of increase in flow stress with decreasing temperature. In order to further evaluate this result, neutron diffractometry at high temperatures was used to monitor any crystallographic changes associated with the metastable region. The results revealed an increase in the rate of contraction of the austenite lattice as the temperature decreases through the metastable state (below $Ae sb3),$ compared with that observed as the temperature decreases through the stable austenite region. Having defined the critical TMP temperatures, the effects of processing parameters on the state of the retained austenite were examined by changing the thermomechanical processing conditions. These effects were more fundamentally considered by tak
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Ozkaya, Yasar A. "Evaluation of yarn characteristics using computer vision and image processing." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/36038.
Повний текст джерелаАнотація:
Irregularity, hairiness and twist are among the most important characteristics that define yarn quality. This thesis describes computer vision and image processing techniques developed to evaluate these characteristics. The optical and electronic aspects such as the illumination, lens parameters and aberrations play crucial role on the quality of yam images and on the overall performance of image processing. The depth of field limitation being the most important restraint in yam imaging as well as image distortion in line scan cameras arising from digitisation and yam movement are modelled mathematically and verified through experiments both for front-lit and back-lit illuminations. Various light sources and arrangements are tested and relative advantages and disadvantages are discussed based on the image quality. Known problems in defining the hair-core boundaries and determining the total hairiness from yam images are addressed and image enhancement and processing algorithms developed to overcome these problems are explained. A method to simulate various yam scanning resolution conditions is described. Using this method, the minimum scanning resolution limits to measure the hairiness and irregularity are investigated.
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King, Susan. "The hot isostatic processing characteristics of 70/30 cupronickel castings." Thesis, Sheffield Hallam University, 1992. http://shura.shu.ac.uk/19916/.
Повний текст джерелаАнотація:
70/30 cupronickel designated in the Naval Engineering Standard NES 824 is associated with high integrity cast components. However this specification restricts the use of welding to recover castings if they are to be wetted by sea water. Hot isostatic pressing is considered to be an alternative recovery process. The mechanisms of pore closure and the processing parameters for successful recovery have been investigated together with their effect on microstructural and mechanical property characteristics. In addition models have been identified which accurately predict pore closure rates in cupronickel castings. Hot isostatic pressing trials were carried out using processing temperatures within the range 850°C and 1025°C and argon gas pressures of 45MPa to 145MPa. Two time, temperature, pressure procedures were investigated; successive cycles of short duration and single continuous cycles. The investigations were carried out on 70/30 cupronickel (NES 824) specimens that contained artificially introduced porosity in the form of closed internal pores and surface-connected porosity: the latter required encapsulation prior to processing. These investigations have revealed that for the removal of surface-connected porosity, successive cycles of short duration were more effective in closing large pores than a single cycle of the same total duration. In addition elongated pores of small diameter were removed more quickly than pores of equivalent volume porosity but smaller aspect ratio. Shorter recovery times were required for the consolidation of internal porosity in comparison with surface-connected porosity indicating that encapsulation restricts the densification process. Initially the rate of densification during HIPping was rapid suggesting that plastic flow was occurring. Subsequent densification probably by viscous flow mechanisms occurred at a much lower rate once the sustain conditions had been reached. This fall off in the densification rate applied in particular to encapsulated castings. The optimum processing conditions for the successful densification of 70/30 cupronickel castings are short sustain times of 45 minutes, a temperature of 950°C and argon gas pressures within the range 83-103MPa. Hot isostatic processing significantly increases the ductility of 70/30 cupronickel castings without a reduction in strength and has no adverse effects on corrosion resistance.
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Ferguson, Melanie A. "Characteristics of auditory processing disorder in primary school-aged children." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14444/.
Повний текст джерелаАнотація:
The aims of this research were to identify and compare auditory processing, speech intelligibility, cognitive, listening, language and communication abilities in (i) typically developing, mainstream school (MS) children (n = 122) for direct comparison with (ii) children presenting to clinical services with auditory processing disorder (APD) (n = 19) or specific language impairment (SLI) (n = 22), and in (iii) a large population sample (n = 1469) who were categorised by their functional listening and communication abilities according to parental report rather than clinical diagnosis. All had normal hearing sensitivity. The clinically referred APD and SLI groups shared many behavioural characteristics across the broad range of measures. Both clinical groups significantly underperformed compared to the MS children, and the APD and SLI groups were virtually indistinguishable. This suggests diagnosis was based more on the referral route than on the actual differences. There was little association of auditory processing deficits with listening or language problems in either the clinical or the population sample after accounting for nonverbal IQ. The only exceptions were backward masking and frequency discrimination, the AP tests with the highest cognitive load. Poor general cognitive abilities were evident in those children with listening or language problems. These results suggest that top-down processing influences listening and language more than bottom-up sensory processing. It is argued that the term APD is a misnomer and should be renamed listening impairment. The co-occurrence of APD, or listening impairment, with both language impairment and autistic behaviours in the clinical and population samples suggests that APD is not a discrete and categorical disorder. Instead, APD as it is currently conceptualised, is dimensional, positioned more towards the language than the autistic extreme. Children with listening impairment who attend Audiology or ENT clinics should be screened for functional everyday measures of language and autistic behaviours to ensure appropriate onward referrals.