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Cardiff University
1.
Al-Jabbouli, Hasan.
Data clustering using the Bees Algorithm and the Kd-tree structure.
Degree: PhD, 2009, Cardiff University
URL: http://orca.cf.ac.uk/54947/ 
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653
► Data clustering has been studied intensively during the past decade. The K-means and C-means algorithms are the most popular of clustering techniques. The former algorithm…
(more)
▼ Data clustering has been studied intensively during the past decade. The K-means and C-means algorithms are the most popular of clustering techniques. The former algorithm is suitable for 'crisp' clustering and the latter, for 'fuzzy' clustering. Clustering using the K-means or C-means algorithms generally is fast and produces good results. Although these algorithms have been successfully implemented in several areas, they still have a number of limitations. The main aim of this work is to develop flexible data management strategies to address some of those limitations and improve the performance of the algorithms. The first part of the thesis introduces improvements to the K-means algorithm. A flexible data structure was applied to help the algorithm to find stable results and to decrease the number of nearest neighbour queries needed to assign data points to clusters. The method has overcome most of the deficiencies of the K-means algorithm. The second and third parts of the thesis present two new clustering algorithms that are capable of locating near optimal solutions efficiently. The proposed algorithms combine the simplicity of the K-means algorithm and the C-means algorithm with the capability of a new optimisation method called the Bees Algorithm to avoid local optima in crisp and fuzzy clustering, respectively. Experimental results for different data sets have demonstrated that the new clustering algorithms produce better performances than those of other algorithms based upon combining an evolutionary optimisation tool and the K-means and C-means clustering methods. The fourth part of this thesis presents an improvement to the basic Bees Algorithm by applying the concept of recursion to reduce the randomness of its local search procedure. The improved Bees Algorithm was applied to crisp and fuzzy data clustering of several data sets. The results obtained confirm the superior performance of the new algorithm.
Subjects/Keywords: 670
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APA (6th Edition):
Al-Jabbouli, H. (2009). Data clustering using the Bees Algorithm and the Kd-tree structure. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653
Chicago Manual of Style (16th Edition):
Al-Jabbouli, Hasan. “Data clustering using the Bees Algorithm and the Kd-tree structure.” 2009. Doctoral Dissertation, Cardiff University. Accessed September 21, 2019.
http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653.
MLA Handbook (7th Edition):
Al-Jabbouli, Hasan. “Data clustering using the Bees Algorithm and the Kd-tree structure.” 2009. Web. 21 Sep 2019.
Vancouver:
Al-Jabbouli H. Data clustering using the Bees Algorithm and the Kd-tree structure. [Internet] [Doctoral dissertation]. Cardiff University; 2009. [cited 2019 Sep 21].
Available from: http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653.
Council of Science Editors:
Al-Jabbouli H. Data clustering using the Bees Algorithm and the Kd-tree structure. [Doctoral Dissertation]. Cardiff University; 2009. Available from: http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653
Cardiff University
2.
Petkov, Petko.
Laser milling : surface integrity, removal strategies and process accuracy.
Degree: PhD, 2011, Cardiff University
URL: http://orca.cf.ac.uk/13705/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142
► Laser milling is capable of processing a large range of materials which are not machinable with conventional manufacturing processes. Engineering materials such as glass, metals…
(more)
▼ Laser milling is capable of processing a large range of materials which are not machinable with conventional manufacturing processes. Engineering materials such as glass, metals and ceramics can be machined without requiring expensive special tools and without any limitations on the 3D complexity of the component. Laser milling is still in its infancy. Laser material interactions are not yet fully understood. Much effort in research and development of the available laser sources is still needed. Ultrafast lasers are beginning to be applied. They can offer more precise machining without the thermal damage that accompanies long-pulse laser manufacturing. Laser pulse duration and its effect on resulting surface integrity has been studied as well as material removal strategy and process accuracy. In order to characterise the resulting surface after laser ablation, the heat affected zone is usually specified. In most cases, visual inspection would be performed without further analysis, resulting in variance of the findings attributed to the operator. A new methodology was required to accurately and impartially assess the heat penetration and quantify the findings. Based on material grain refinement, a comprehensive new methodology was created. By monitoring the changes in grain sizes, a chart of the heat penetration could be created accurately with automated routines. Surface integrity is a critical factor for many applications and a methodology based on analysis of grain refinement in the vicinity of the processed area would create a full map of - iii - the changes happening after laser ablation. Furthermore, the impact of the laser pulse duration is studied utilising the above mentioned development. Further to the surface roughness and heat affected zone, an in-depth analysis was completed on the micro hardness of the material in order to create a comprehensive chart of the changes induced by the laser milling process. Material removal is based on the overlapping of single craters, and the way the craters overlap is referred to as material removal strategy. Generally there are many strategies formulated for material removal but none of them takes into account the specifics of laser milling. Based on surface orientation, dimensions and feature importance, an assessment of material removal strategies is presented. Although ‘laser milling’ is a term used for a number of material removal processes, there are significant differences between them. New strategies for material removal are formulated and reported based on surface topography and orientation. Advanced programming is realised using a commercially available generic CAM package but taking into account the specifics of the laser milling process. The accuracy of the laser milling process depends on the laser-material interaction, and also on the machine hardware, control system and software. Most of the factors affecting accuracy cannot be changed once the machine is built, but there are some that can be optimised to improve process accuracy. The laser source with its…
Subjects/Keywords: 670
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APA (6th Edition):
Petkov, P. (2011). Laser milling : surface integrity, removal strategies and process accuracy. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142
Chicago Manual of Style (16th Edition):
Petkov, Petko. “Laser milling : surface integrity, removal strategies and process accuracy.” 2011. Doctoral Dissertation, Cardiff University. Accessed September 21, 2019.
http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142.
MLA Handbook (7th Edition):
Petkov, Petko. “Laser milling : surface integrity, removal strategies and process accuracy.” 2011. Web. 21 Sep 2019.
Vancouver:
Petkov P. Laser milling : surface integrity, removal strategies and process accuracy. [Internet] [Doctoral dissertation]. Cardiff University; 2011. [cited 2019 Sep 21].
Available from: http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142.
Council of Science Editors:
Petkov P. Laser milling : surface integrity, removal strategies and process accuracy. [Doctoral Dissertation]. Cardiff University; 2011. Available from: http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142
Cardiff University
3.
Buckley, Jake.
Queer Fordism : technological bodies moving otherwise.
Degree: PhD, 2010, Cardiff University
URL: http://orca.cf.ac.uk/54379/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879
► This thesis analyses the temporal logic that informs the shift from Fordism to post-Fordism, a highly influential narrative for understanding how developments in technology affect…
(more)
▼ This thesis analyses the temporal logic that informs the shift from Fordism to post-Fordism, a highly influential narrative for understanding how developments in technology affect the body in western nation-states from the late nineteenth century to the present. The thesis reads this shift as a history of touch and bodily mobility. First, I study the techniques of factory management known as Taylorism, which provided the basis for the Fordist socioeconomic system. Taylorized Fordism, I show, made working bodies touch technological objects in order to time, represent, and control bodily movements. However, I argue that Taylorized Fordist techniques organize bodies into a space of tactility, which is not the same as invoking Fordism as a predictable system of domination. Second, I discuss socio-historical accounts that outline the reasons for Fordism's eventual failure and replacement, all of which emphasize bodily flexibility as the quality that determines a post-Fordist time. I consider the fate of Taylorism in Fordism's ostensible demise, by explicating the subtlety with which Taylorism is superseded by the more flexible practice of ergonomics. Third, I conduct a philosophical analysis of what it means for bodies to be affected by post-Fordist changes in technological objects, most prominently the transition towards digital media. I refute the notion of a post-Fordist digital age, by arguing that Taylorized Fordism can be interpreted as a model of digital bodily function that persists uncomfortably in the present. The thesis concludes by arguing for the significance of touching tactile technological objects—and tactile technological bodies making contact with one another—in ways that produce stasis, rigidity, and hardness—Fordist qualities that are unfairly subordinated in a post-Fordist temporal frame. I call these relations 'queer Fordism', whereby a technological body's activity is not contemporaneous with a presumed Fordist-to-post-Fordist continuum.
Subjects/Keywords: 670
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APA (6th Edition):
Buckley, J. (2010). Queer Fordism : technological bodies moving otherwise. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879
Chicago Manual of Style (16th Edition):
Buckley, Jake. “Queer Fordism : technological bodies moving otherwise.” 2010. Doctoral Dissertation, Cardiff University. Accessed September 21, 2019.
http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879.
MLA Handbook (7th Edition):
Buckley, Jake. “Queer Fordism : technological bodies moving otherwise.” 2010. Web. 21 Sep 2019.
Vancouver:
Buckley J. Queer Fordism : technological bodies moving otherwise. [Internet] [Doctoral dissertation]. Cardiff University; 2010. [cited 2019 Sep 21].
Available from: http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879.
Council of Science Editors:
Buckley J. Queer Fordism : technological bodies moving otherwise. [Doctoral Dissertation]. Cardiff University; 2010. Available from: http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879
Loughborough University
4.
Read, Craig.
Complexity characteristics and measurement within engineering systems.
Degree: PhD, 2008, Loughborough University
URL: https://dspace.lboro.ac.uk/2134/8140
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506212
► Complexity is a significant factor in the development of new products and systems; generally speaking, the higher the complexity, the more difficult products and systems…
(more)
▼ Complexity is a significant factor in the development of new products and systems; generally speaking, the higher the complexity, the more difficult products and systems are going to be to design and develop. There are a number of different factors that influence complexity within systems, namely: interoperability; upgradability; adaptability; evolving requirements; system size; automation requirements; performance requirements; support requirements; sustainability; reliability; the need for increased product lifespan; and finally, the length of time systems take to develop. There is, at present, no common language to describe complexity within engineered systems; this language needs to be developed in order to help industry cope with increasing product complexity and thus meet customer demands. This thesis represents a start in the development of that language, and thus an understanding of systems complexity. The thesis offers a framework for complexity analysis within systems, one which identifies some of the key complexity characteristics that need to be taken into consideration, and which embraces complexity problems, definitions, concepts and classifications, origins and coping mechanisms. It has also has been developed in terms of a measurement approach, thereby allowing for a meaningful comparison between products, and an understanding of the complexities within them. This framework was developed using information collected from academic literature and from more specific case studies. Each complexity characteristic was investigated, and the interactions between characteristics were identified; these interactions allow us to understand complexity and help to develop a common language. The thesis develops a measurement technique that quantifies various complexity characteristics in terms of the framework laid down, thus enabling a quantified understanding of complexity within systems. This new measurement approach was tested on a set of recent case studies, and the complexity characteristics produced by the measurement technique were, in turn, tested against attributes of the system. The framework itself is always evolving - it incorporates new complexity characteristics. Nevertheless, such evolution can only further our understanding of complexity. Further work, to explore and integrate the approach demonstrated in this thesis into an automated tool, and test its robustness, along with a continual development of other elements of the framework, such as a classification of complexity, is recommended.
Subjects/Keywords: 670
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APA (6th Edition):
Read, C. (2008). Complexity characteristics and measurement within engineering systems. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/8140 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506212
Chicago Manual of Style (16th Edition):
Read, Craig. “Complexity characteristics and measurement within engineering systems.” 2008. Doctoral Dissertation, Loughborough University. Accessed September 21, 2019.
https://dspace.lboro.ac.uk/2134/8140 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506212.
MLA Handbook (7th Edition):
Read, Craig. “Complexity characteristics and measurement within engineering systems.” 2008. Web. 21 Sep 2019.
Vancouver:
Read C. Complexity characteristics and measurement within engineering systems. [Internet] [Doctoral dissertation]. Loughborough University; 2008. [cited 2019 Sep 21].
Available from: https://dspace.lboro.ac.uk/2134/8140 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506212.
Council of Science Editors:
Read C. Complexity characteristics and measurement within engineering systems. [Doctoral Dissertation]. Loughborough University; 2008. Available from: https://dspace.lboro.ac.uk/2134/8140 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506212
Loughborough University
5.
Lee, Michael.
Product modularity : a multi-objective configuration approach.
Degree: PhD, 2010, Loughborough University
URL: https://dspace.lboro.ac.uk/2134/6208
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519961
► Product modularity is often seen as a means by which a product system can be decomposed into smaller, more manageable chunks in order to better…
(more)
▼ Product modularity is often seen as a means by which a product system can be decomposed into smaller, more manageable chunks in order to better manage design, manufacturing and after-sales complexity. The most common approach is to decompose the product down to component level and then group the components to form modules. The rationale for module grouping can vary, from the more technical physical and functional component interactions, to any number of strategic objectives such as variety, maintenance and recycling. The problem lies with the complexity of product modularity under these multiple (often conflicting) objectives. The research in this thesis presents a holistic multi-objective computer aided modularity optimisation (CAMO) framework. The framework consists of four main steps: 1) product decomposition; 2) interaction analysis; 3) formation of modular architectures and; 4) scenario analysis. In summary of these steps: the product is first decomposed into a number a basic components by analysis of both the physical and functional product domains. The various dependencies and strategic similarities that occur between the product s components are then analysed and entered into a number of interaction matrixes. A specially developed multi-objective grouping genetic algorithm (MOGGA) then searches the matrices and provides a whole set of alternative (yet optimal) modular product configurations. The solution set is then evaluated and explored (scenario analysis) using the principles of Analytic Hierarchy Process. A software prototype has been created for the CAMO framework using Visual Basic to create a multi-objective genetic algorithm (GA) based optimiser within an excel environment. A case study has been followed to demonstrate the various steps of the framework and make comparisons with previous works. Unlike previous works, that have used simplistic optimisation algorithms and have in general only considered a limited number of modularisation objectives, the developed framework provides a true multi-objective approach to the product modularisation problem.
Subjects/Keywords: 670
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APA ·
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APA (6th Edition):
Lee, M. (2010). Product modularity : a multi-objective configuration approach. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/6208 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519961
Chicago Manual of Style (16th Edition):
Lee, Michael. “Product modularity : a multi-objective configuration approach.” 2010. Doctoral Dissertation, Loughborough University. Accessed September 21, 2019.
https://dspace.lboro.ac.uk/2134/6208 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519961.
MLA Handbook (7th Edition):
Lee, Michael. “Product modularity : a multi-objective configuration approach.” 2010. Web. 21 Sep 2019.
Vancouver:
Lee M. Product modularity : a multi-objective configuration approach. [Internet] [Doctoral dissertation]. Loughborough University; 2010. [cited 2019 Sep 21].
Available from: https://dspace.lboro.ac.uk/2134/6208 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519961.
Council of Science Editors:
Lee M. Product modularity : a multi-objective configuration approach. [Doctoral Dissertation]. Loughborough University; 2010. Available from: https://dspace.lboro.ac.uk/2134/6208 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519961
6.
See-Toh, Yoong Chiang.
Paints supply chain optimisation.
Degree: PhD, 2008, Imperial College London
URL: http://hdl.handle.net/10044/1/7504
► In production planning for strong seasonal demand products, it is uneconomical to configure the supply chain for throughputs equivalent to the demand peaks. Instead, a…
(more)
▼ In production planning for strong seasonal demand products, it is uneconomical to configure the supply chain for throughputs equivalent to the demand peaks. Instead, a holistic approach to supply chain optimisation is adopted where forward demand forecasts drive the production planning process. In this thesis, the medium-term supply chain planning components of forecasting, production planning and evaluation are addressed through studies on a paints production facility. With a large number of specialised products, family-level forecasting is adopted for its simplicity and practicality in applying forecast techniques, coupled with its benefits on the inception of new products into markets. A time-series component was incorporated into traditional clustering techniques for segmenting products into families. The dominant cluster profiles identified are attributed as the seasonal component for the subsequent generation of demand profiles. In multi-purpose batch plants, production planning involves the twin decisions of batch sizing and lot sizing, often performed in series. This campaign is optimised through augmenting the batch sizing operation within a lot-sizing model. In the Mixed Integer Linear Programming model developed here, the degrees of freedom are the monthly batch sizes of each product, integer number of batches of each product produced each month, amount of monthly overtime working and outsourcing required as well as the time-varying inventory positions across the chain. Values for these are selected to balance the trade-offs in batch costs and inventory costs as well as the overtime and outsourcing costs. The final section sees the development of stochastic, dynamic supply chain models to predict the effect of different inventory policies, taking into account forecast accuracy, as derived from clustering. Using Monte Carlo based simulations, the various supply and production decisions are assessed against process manufacturing performance indicators. These planning components are then reconfigured to derive an optimal paints supply chain.
Subjects/Keywords: 670
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APA (6th Edition):
See-Toh, Y. C. (2008). Paints supply chain optimisation. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/7504
Chicago Manual of Style (16th Edition):
See-Toh, Yoong Chiang. “Paints supply chain optimisation.” 2008. Doctoral Dissertation, Imperial College London. Accessed September 21, 2019.
http://hdl.handle.net/10044/1/7504.
MLA Handbook (7th Edition):
See-Toh, Yoong Chiang. “Paints supply chain optimisation.” 2008. Web. 21 Sep 2019.
Vancouver:
See-Toh YC. Paints supply chain optimisation. [Internet] [Doctoral dissertation]. Imperial College London; 2008. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/10044/1/7504.
Council of Science Editors:
See-Toh YC. Paints supply chain optimisation. [Doctoral Dissertation]. Imperial College London; 2008. Available from: http://hdl.handle.net/10044/1/7504
Cardiff University
7.
Lagos, Nikolaos.
Knowledge-based product support systems.
Degree: 2007, Cardiff University
URL: http://orca.cf.ac.uk/54573/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020
► This research helps bridge the gap between conventional product support, where the support system is considered as a stand-alone application, and the new paradigm of…
(more)
▼ This research helps bridge the gap between conventional product support, where the support system is considered as a stand-alone application, and the new paradigm of responsive one, where the support system frequently communicates with its environment and reacts to stimuli. This new paradigm would enable product support knowledge to be captured, stored, processed, and updated automatically, being delivered to the users when, where and in the form they need it. The research reported in this thesis first defines Product Support Systems (PRSSs) as electronic means that provide accurate and up-to-date information to the user in a coherent and personalised manner. Product support knowledge is then identified as the integration of product, task, user, and support documentation knowledge. Next, the thesis focuses on an ontology-based model of the structure, relations, and attributes of product support knowledge. In that model product support virtual documentation (PSVD) is presented as an aggregation of Information Objects (IOs) and Information Object Clusters (IOCs). The description of PSVD is followed by an analysis of the relation between IOs, IOCs, and domain knowledge. Then, the thesis builds on the ontology-based representation of product support knowledge and explores the synergy between product support, problem solving, and knowledge engineering. As a result, a structured problem solving approach is introduced that combines case-based adaptation and model-based generation techniques. Based on that approach a knowledge engineering framework for product support systems is developed. A conceptual model of context-aware product support systems that extends the framework is then introduced. The conceptual model includes an ontology-based representation of knowledge related to the users, their activities, the support environment, and the device being used. An approach to semi-automatically integrating design and documentation data is also proposed as part of context-aware product support systems development process.
Subjects/Keywords: 670
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APA ·
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APA (6th Edition):
Lagos, N. (2007). Knowledge-based product support systems. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020
Chicago Manual of Style (16th Edition):
Lagos, Nikolaos. “Knowledge-based product support systems.” 2007. Doctoral Dissertation, Cardiff University. Accessed September 21, 2019.
http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020.
MLA Handbook (7th Edition):
Lagos, Nikolaos. “Knowledge-based product support systems.” 2007. Web. 21 Sep 2019.
Vancouver:
Lagos N. Knowledge-based product support systems. [Internet] [Doctoral dissertation]. Cardiff University; 2007. [cited 2019 Sep 21].
Available from: http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020.
Council of Science Editors:
Lagos N. Knowledge-based product support systems. [Doctoral Dissertation]. Cardiff University; 2007. Available from: http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020
Cranfield University
8.
Martina, Filomeno.
Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing.
Degree: PhD, 2014, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/9270
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979
► Wire+arc additive manufacturing is a technique suitable for the deposition of large components; a variety of materials can be processed, including titanium. For the alloy…
(more)
▼ Wire+arc additive manufacturing is a technique suitable for the deposition of large components; a variety of materials can be processed, including titanium. For the alloy Ti{6Al{4V, an experimental model based on design of experiment and linear regression was developed to control layer geometry during deposition. The modelled variables were wall width and layer height; the former was dependent on the heat input, and the latter on the heat input as well as on the wire feed speed to travel speed ratio. Equations enabled the automatic selection of process parameters based on geometric requirements speci c to the part being built. This could ensure minimisation of production time and material waste. Additively manufactured parts are a ected by distortion and residual stress; the e ect of high pressure rolling on these two, as well as on geometry, microstructure and mechanical properties was studied. Due to plastic deformation, rolled linear deposits were characterised by a larger width and smaller height. The variability of the layer height was reduced, a bene cial e ect from a production implementation viewpoint. Distortion was less than half in rolled components, a change associated with the reduction in residual stress which were still tensile in the bottom of the parts and compressive in their top; however their overall magnitude was smaller than in the unrolled samples. The contour method showed relatively good agreement with the neutron di raction measurements, and although destructive it proved to be a fast way to characterise residual stress in additively manufactured components. Microstructurally, the columnar prior grains con guration observed in all unrolled deposits, also a ected by a strong texture developed in the building direction, was changed to equiaxed grains due to the recrystallisation triggered by both the strain introduced by rolling and the repeated thermal cycles induced by each layer deposition. The microstructure was overall considerably ner and the texture randomised. A fundamental study was performed to discern the extent of the deformed zone from the one a ected thermally. While the deformed zone could not be identi ed precisely, the thermally in uenced zone showed a relationship between rolling load and depth of the recrystallised volume. Finally, testing of hardness and tensile strength showed superior properties of rolled specimens than in the unrolled specimens. The mechanical performance of rolled samples was fully isotropic too. This project was entirely sponsored by Airbus Group Innovations (formerly EADS Innovation Works).
Subjects/Keywords: 670
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APA (6th Edition):
Martina, F. (2014). Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979
Chicago Manual of Style (16th Edition):
Martina, Filomeno. “Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing.” 2014. Doctoral Dissertation, Cranfield University. Accessed September 21, 2019.
http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979.
MLA Handbook (7th Edition):
Martina, Filomeno. “Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing.” 2014. Web. 21 Sep 2019.
Vancouver:
Martina F. Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing. [Internet] [Doctoral dissertation]. Cranfield University; 2014. [cited 2019 Sep 21].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979.
Council of Science Editors:
Martina F. Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing. [Doctoral Dissertation]. Cranfield University; 2014. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979
Durham University
9.
Shetwan, Ali Gassim M.
Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System.
Degree: PhD, 2013, Durham University
URL: http://etheses.dur.ac.uk/7730/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766
► In multistage manufacturing processes it is common to locate inspection stations after some or all of the processing workstations. The purpose of the inspection is…
(more)
▼ In multistage manufacturing processes it is common to locate inspection stations after some or all of the processing workstations. The purpose of the inspection is to reduce the total manufacturing cost, resulted from unidentified defective items being processed unnecessarily through subsequent manufacturing operations. This total cost is the sum of the costs of production, inspection and failures (during production and after shipment). Introducing inspection stations into a serial multistage manufacturing process, although constituting an additional cost, is expected to be a profitable course of action. Specifically, at some positions the associated inspection costs will be recovered from the benefits realised through the detection of defective items, before wasting additional cost by continuing to process them. In this research, a novel general cost modelling for allocating a limited number of inspection stations in serial multistage manufacturing processes is formulated. In allocation of inspection station (AOIS) problem, as the number of workstations increases, the number of inspection station allocation possibilities increases exponentially. To identify the appropriate approach for the AOIS problem, different optimisation methods are investigated. The MAX-MIN Ant System (MMAS) algorithm is proposed as a novel approach to explore AOIS in serial multistage manufacturing processes. MMAS is an ant colony optimisation algorithm that was designed originally to begin an explorative search phase and, subsequently, to make a slow transition to the intensive exploitation of the best solutions found during the search, by allowing only one ant to update the pheromone trails. Two novel heuristics information for the MMAS algorithm are created. The heuristic information for the MMAS algorithm is exploited as a novel means to guide ants to build reasonably good solutions from the very beginning of the search. To improve the performance of the MMAS algorithm, six local search methods which are well-known and suitable for the AOIS problem are used. Selecting relevant parameter values for the MMAS algorithm can have a great impact on the algorithm’s performance. As a result, a method for tuning the most influential parameter values for the MMAS algorithm is developed. The contribution of this research is, for the first time, a methodology using MMAS to solve the AOIS problem in serial multistage manufacturing processes has been developed. The methodology takes into account the constraints on inspection resources, in terms of a limited number of inspection stations. As a result, the total manufacturing cost of a product can be reduced, while maintaining the quality of the product. Four numerical experiments are conducted to assess the MMAS algorithm for the AOIS problem. The performance of the MMAS algorithm is compared with a number of other methods this includes the complete enumeration method (CEM), rule of thumb, a pure random search algorithm, particle swarm optimisation, simulated annealing and genetic algorithm. The…
Subjects/Keywords: 670
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APA (6th Edition):
Shetwan, A. G. M. (2013). Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System. (Doctoral Dissertation). Durham University. Retrieved from http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766
Chicago Manual of Style (16th Edition):
Shetwan, Ali Gassim M. “Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System.” 2013. Doctoral Dissertation, Durham University. Accessed September 21, 2019.
http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766.
MLA Handbook (7th Edition):
Shetwan, Ali Gassim M. “Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System.” 2013. Web. 21 Sep 2019.
Vancouver:
Shetwan AGM. Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System. [Internet] [Doctoral dissertation]. Durham University; 2013. [cited 2019 Sep 21].
Available from: http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766.
Council of Science Editors:
Shetwan AGM. Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System. [Doctoral Dissertation]. Durham University; 2013. Available from: http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766
University of Sheffield
10.
McLeay, T. E.
Unsupervised monitoring of machining processes.
Degree: PhD, 2016, University of Sheffield
URL: http://etheses.whiterose.ac.uk/16556/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041
► Machining processes, such as milling, drilling, turning and grinding, concern the removal of material from a workpiece using a cutting tool. These processes are sensitive…
(more)
▼ Machining processes, such as milling, drilling, turning and grinding, concern the removal of material from a workpiece using a cutting tool. These processes are sensitive to parameters such as cutting tool properties, workpiece materials, coolant application, machine selection, fixturing and cutting parameters. The focus of the work in this thesis is to devise a method to monitor the changing conditions of a machining process over time in order to detect faulty machining conditions and diagnose fault types and causes. A key aim of this thesis is to develop a monitoring regime that has minimal cost of implementation and upkeep in a production environment, therefore an unsupervised monitoring system which applies non-intrusive sensing hardware is proposed.
Subjects/Keywords: 670
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APA (6th Edition):
McLeay, T. E. (2016). Unsupervised monitoring of machining processes. (Doctoral Dissertation). University of Sheffield. Retrieved from http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041
Chicago Manual of Style (16th Edition):
McLeay, T E. “Unsupervised monitoring of machining processes.” 2016. Doctoral Dissertation, University of Sheffield. Accessed September 21, 2019.
http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041.
MLA Handbook (7th Edition):
McLeay, T E. “Unsupervised monitoring of machining processes.” 2016. Web. 21 Sep 2019.
Vancouver:
McLeay TE. Unsupervised monitoring of machining processes. [Internet] [Doctoral dissertation]. University of Sheffield; 2016. [cited 2019 Sep 21].
Available from: http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041.
Council of Science Editors:
McLeay TE. Unsupervised monitoring of machining processes. [Doctoral Dissertation]. University of Sheffield; 2016. Available from: http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041
University of Surrey
11.
Howard, Kevin Richard.
The application of entropy in optimising systems.
Degree: PhD, 2009, University of Surrey
URL: http://epubs.surrey.ac.uk/842681/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971
► A novel application of entropy to support Systems Engineering is presented with the specific objective of providing unambiguous and objective decision support to the engineer…
(more)
▼ A novel application of entropy to support Systems Engineering is presented with the specific objective of providing unambiguous and objective decision support to the engineer from the earliest stages of system development. Three facets of entropy are identified: How information passes around the system, How elements are oriented within the system, How the structured of the system is realized. From the outset, the Unified Modelling Language (UML) has been used as the language of choice for capturing system description and the work described in this thesis has made a significant contribution to its use within Thales for Systems Engineering. At the beginning of the project this was a novel application but the use of UML is now commonplace across the SE community. In order to capture the measures of entropy within the UML, a new generalised framework for interface definition is proposed covering six aspects: Information Protocol Management Security Carrier Physical, The work explores a range of techniques that are in common use, and through discussion of two specific, real-world examples conclude that minimising the entropy is entirely consistent with improvements suggested by other means; A wireless house alarm will reduce entropy but only for the larger house Clustering at the lower levels of networks reduces their entropy This new, unambiguous and objective measure of entropy provides engineers with a decision aid that can be applied early in the development lifecycle. The UML is used to describe systems and lends itself to incorporating this entropy measure. However, three simple rules result from the thesis that can be applied without formal calculation: 1 Minimise the number interfaces between entities and their bandwidth. 2 Either ensure all interfaces of an entity the same or ensure each is unique. 3 Ensure an entity has no more than one dependency on other system entities.
Subjects/Keywords: 670
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APA (6th Edition):
Howard, K. R. (2009). The application of entropy in optimising systems. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971
Chicago Manual of Style (16th Edition):
Howard, Kevin Richard. “The application of entropy in optimising systems.” 2009. Doctoral Dissertation, University of Surrey. Accessed September 21, 2019.
http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971.
MLA Handbook (7th Edition):
Howard, Kevin Richard. “The application of entropy in optimising systems.” 2009. Web. 21 Sep 2019.
Vancouver:
Howard KR. The application of entropy in optimising systems. [Internet] [Doctoral dissertation]. University of Surrey; 2009. [cited 2019 Sep 21].
Available from: http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971.
Council of Science Editors:
Howard KR. The application of entropy in optimising systems. [Doctoral Dissertation]. University of Surrey; 2009. Available from: http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971
12.
Lukaszewicz, Dirk Hans-Joachim Adrian.
Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.
Degree: PhD, 2011, University of Bristol
URL: http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad
► Automated lay-up of prepreg is slowly replacing manual layup during the production of composite parts for aerospace, automotive and renewable energy applications. This is driven…
(more)
▼ Automated lay-up of prepreg is slowly replacing manual layup during the production of composite parts for aerospace, automotive and renewable energy applications. This is driven by a need for higher manufacturing rates from aerospace manufacturers and a need for high quality manufacture for wind and tidal power blades. The main methods for automated layup are Automated Tape Laying (ATL) and Automated Fibre Placement (AFP). However, despite its industrial importance the amount of research into both processes is limited, in particular with respect to productivity and process reliability. The study outlined in this presentation aims to investigate feasible processing conditions for automated layup that may improve laminate quality and productivity both analytically and experimentally whilst curing out-of-autoclave. Prepreg properties relevant to automated processing are identified. Lastly, requirements for an optimised layup system are proposed. A detailed study of the resin content of automation grade prepreg shows a significant variability of resin content that may affect tack and lead to unsuccessful layup. High product quality is governed by the amount of voidage entrapped in the uncured plies. A study of the surface roughness of uncured prepreg shows the potential for significant entrapment of air during layup. Since debulking is commonly omitted for continuous processing a large amount of voidage is entrapped in the uncured laminate and may have detrimental impact on mechanical performance. A model was developed that takes into account the prepreg interface and forming behaviour during automated processing to predict the amount of entrapped air and allow optimisation of processing conditions. A two-stage layup model was implemented in Abaqus/Implicit to study the process in detail. First, the interaction between ply and layup system was studied in detail, the results were then used to predict the forming behaviour of uncured prepreg on a microscopic scale. To understand the effect of processing conditions in more detail a laboratory Iayup system was built that enables layup at conditions currently not achievable with industrial equipment. The interaction between layup temperature and pressure was studied experimentally to validate previously developed models
Subjects/Keywords: 670
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APA (6th Edition):
Lukaszewicz, D. H. A. (2011). Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. (Doctoral Dissertation). University of Bristol. Retrieved from http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad
Chicago Manual of Style (16th Edition):
Lukaszewicz, Dirk Hans-Joachim Adrian. “Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.” 2011. Doctoral Dissertation, University of Bristol. Accessed September 21, 2019.
http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad.
MLA Handbook (7th Edition):
Lukaszewicz, Dirk Hans-Joachim Adrian. “Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.” 2011. Web. 21 Sep 2019.
Vancouver:
Lukaszewicz DHA. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. [Internet] [Doctoral dissertation]. University of Bristol; 2011. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad.
Council of Science Editors:
Lukaszewicz DHA. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. [Doctoral Dissertation]. University of Bristol; 2011. Available from: http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad
13.
Melèndez Mezquita, Yocary Vanessa; Hernàndez Canales, Misael Ricardo.
"Propuesta de diseño arquitectònico de vivienda de bajo costo utilizando principalmente el bambù como material constructivo.".
Degree: other, Facultad Multidisciplinaria De Occidente, 2013, Universidad de El Salvador
URL: http://ri.ues.edu.sv/14095/1/ARCHIVOS%20DE%20TESIS.rar
► La realidad nacional con la que cuenta El Salvador es que mucha de la población no cuenta con vivienda que le ofrezca la solución básica…
(more)
▼ La realidad nacional con la que cuenta El Salvador es que mucha de la población no cuenta con vivienda que le ofrezca la solución básica a sus necesidades, muchas comunidades llamadas “ilegales” se vuelven comunes y se tiene el concepto denigrante excluyente de ser “marginales” que son personas y grupos de personas que van en busca de un espacio en el que puedan “vivir” y relacionarse con sus demás individuos. Muchas de esas viviendas son elaboradas con materiales que no son aptos para la construcción de una vivienda, sin embargo son las herramientas con la que cuenta este tipo de personas en su diario vivir.
Subjects/Keywords: 670 Manufactura
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APA (6th Edition):
Melèndez Mezquita, Yocary Vanessa; Hernàndez Canales, M. R. (2013). "Propuesta de diseño arquitectònico de vivienda de bajo costo utilizando principalmente el bambù como material constructivo.". (Thesis). Universidad de El Salvador. Retrieved from http://ri.ues.edu.sv/14095/1/ARCHIVOS%20DE%20TESIS.rar
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Melèndez Mezquita, Yocary Vanessa; Hernàndez Canales, Misael Ricardo. “"Propuesta de diseño arquitectònico de vivienda de bajo costo utilizando principalmente el bambù como material constructivo.".” 2013. Thesis, Universidad de El Salvador. Accessed September 21, 2019.
http://ri.ues.edu.sv/14095/1/ARCHIVOS%20DE%20TESIS.rar.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Melèndez Mezquita, Yocary Vanessa; Hernàndez Canales, Misael Ricardo. “"Propuesta de diseño arquitectònico de vivienda de bajo costo utilizando principalmente el bambù como material constructivo.".” 2013. Web. 21 Sep 2019.
Vancouver:
Melèndez Mezquita, Yocary Vanessa; Hernàndez Canales MR. "Propuesta de diseño arquitectònico de vivienda de bajo costo utilizando principalmente el bambù como material constructivo.". [Internet] [Thesis]. Universidad de El Salvador; 2013. [cited 2019 Sep 21].
Available from: http://ri.ues.edu.sv/14095/1/ARCHIVOS%20DE%20TESIS.rar.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Melèndez Mezquita, Yocary Vanessa; Hernàndez Canales MR. "Propuesta de diseño arquitectònico de vivienda de bajo costo utilizando principalmente el bambù como material constructivo.". [Thesis]. Universidad de El Salvador; 2013. Available from: http://ri.ues.edu.sv/14095/1/ARCHIVOS%20DE%20TESIS.rar
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
14.
Linares Rebollo, Francisco Estebàn; Rivas Ramos, Jorge Alberto.
"Propuesta de una guìa metodològica para la elaboraciòn y ejecuciòn del programa de gestiòn de prevenciòn de riesgos ocupacionales en proyectos de construcciòn de obras civiles De El Salvador".
Degree: other, Facultad Multidisciplinaria de Occidente, 2014, Universidad de El Salvador
URL: http://ri.ues.edu.sv/15276/
► Desde los comienzos de la vida el ser humano se ha visto en la necesidad de protegerse de las adversidades y peligros del diario vivir;…
(more)
▼ Desde los comienzos de la vida el ser humano se ha visto en la necesidad de protegerse de las adversidades y peligros del diario vivir; mostrándose desde el inicio de la civilización con la creación de lugares de habitación y resguardo; así, evolucionando día a día todos los componentes de protección del mismo. En los últimos siglos aumentó el auge de la Seguridad Humana, en los lugares de trabajo, en lugares de esparcimiento y dondequiera que éste se encuentre, aún más, en el trayecto a ellos; es por ello que surge la iniciativa de reglamentar las condiciones de seguridad en los lugares de trabajo.
Subjects/Keywords: 670 Manufactura
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APA (6th Edition):
Linares Rebollo, Francisco Estebàn; Rivas Ramos, J. A. (2014). "Propuesta de una guìa metodològica para la elaboraciòn y ejecuciòn del programa de gestiòn de prevenciòn de riesgos ocupacionales en proyectos de construcciòn de obras civiles De El Salvador". (Thesis). Universidad de El Salvador. Retrieved from http://ri.ues.edu.sv/15276/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Linares Rebollo, Francisco Estebàn; Rivas Ramos, Jorge Alberto. “"Propuesta de una guìa metodològica para la elaboraciòn y ejecuciòn del programa de gestiòn de prevenciòn de riesgos ocupacionales en proyectos de construcciòn de obras civiles De El Salvador".” 2014. Thesis, Universidad de El Salvador. Accessed September 21, 2019.
http://ri.ues.edu.sv/15276/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Linares Rebollo, Francisco Estebàn; Rivas Ramos, Jorge Alberto. “"Propuesta de una guìa metodològica para la elaboraciòn y ejecuciòn del programa de gestiòn de prevenciòn de riesgos ocupacionales en proyectos de construcciòn de obras civiles De El Salvador".” 2014. Web. 21 Sep 2019.
Vancouver:
Linares Rebollo, Francisco Estebàn; Rivas Ramos JA. "Propuesta de una guìa metodològica para la elaboraciòn y ejecuciòn del programa de gestiòn de prevenciòn de riesgos ocupacionales en proyectos de construcciòn de obras civiles De El Salvador". [Internet] [Thesis]. Universidad de El Salvador; 2014. [cited 2019 Sep 21].
Available from: http://ri.ues.edu.sv/15276/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Linares Rebollo, Francisco Estebàn; Rivas Ramos JA. "Propuesta de una guìa metodològica para la elaboraciòn y ejecuciòn del programa de gestiòn de prevenciòn de riesgos ocupacionales en proyectos de construcciòn de obras civiles De El Salvador". [Thesis]. Universidad de El Salvador; 2014. Available from: http://ri.ues.edu.sv/15276/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
15.
García Henriquez, Mauricio Alberto; Rivera Linares, José Rubén.
"Propuesta de diseño de una sección de desarrollo de habilidades industriales en el laboratorio de ingenieria industrial, en La Facultad Multidisciplinaria De Occidente De La Universidad De El Salvador".
Degree: other, Facultad Multidisciplinaria De Occidente, 2017, Universidad de El Salvador
URL: http://ri.ues.edu.sv/15526/
► A lo largo de la formación de una persona como futuro Ingeniero Industrial, esta adquiere habilidades y destrezas que le serán útiles en el campo…
(more)
▼ A lo largo de la formación de una persona como futuro Ingeniero Industrial, esta adquiere habilidades y destrezas que le serán útiles en el campo laboral, permitiendo, a su vez, que ésta obtenga las competencias necesarias para la resolución de problemas y toma de decisiones.
Estas habilidades y destrezas son adquiridas en el desarrollo práctico de las clases teóricas que reciben los estudiantes. Actualmente las prácticas de Tecnología Industrial I, II y III se llevan a cabo en el taller de Ingeniería Industrial, dejando de lado el desarrollo práctico de otras materias fundamentales de la carrera que también lo requieren. En este contexto se hace necesario la creación de una sección de desarrollo de habilidades industriales que dependa y a su vez auxilie la demanda de estudiantes que el actual taller de Ingeniería Industrial no logra cubrir.
Subjects/Keywords: 670 Manufactura
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APA (6th Edition):
García Henriquez, Mauricio Alberto; Rivera Linares, J. R. (2017). "Propuesta de diseño de una sección de desarrollo de habilidades industriales en el laboratorio de ingenieria industrial, en La Facultad Multidisciplinaria De Occidente De La Universidad De El Salvador". (Thesis). Universidad de El Salvador. Retrieved from http://ri.ues.edu.sv/15526/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
García Henriquez, Mauricio Alberto; Rivera Linares, José Rubén. “"Propuesta de diseño de una sección de desarrollo de habilidades industriales en el laboratorio de ingenieria industrial, en La Facultad Multidisciplinaria De Occidente De La Universidad De El Salvador".” 2017. Thesis, Universidad de El Salvador. Accessed September 21, 2019.
http://ri.ues.edu.sv/15526/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
García Henriquez, Mauricio Alberto; Rivera Linares, José Rubén. “"Propuesta de diseño de una sección de desarrollo de habilidades industriales en el laboratorio de ingenieria industrial, en La Facultad Multidisciplinaria De Occidente De La Universidad De El Salvador".” 2017. Web. 21 Sep 2019.
Vancouver:
García Henriquez, Mauricio Alberto; Rivera Linares JR. "Propuesta de diseño de una sección de desarrollo de habilidades industriales en el laboratorio de ingenieria industrial, en La Facultad Multidisciplinaria De Occidente De La Universidad De El Salvador". [Internet] [Thesis]. Universidad de El Salvador; 2017. [cited 2019 Sep 21].
Available from: http://ri.ues.edu.sv/15526/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
García Henriquez, Mauricio Alberto; Rivera Linares JR. "Propuesta de diseño de una sección de desarrollo de habilidades industriales en el laboratorio de ingenieria industrial, en La Facultad Multidisciplinaria De Occidente De La Universidad De El Salvador". [Thesis]. Universidad de El Salvador; 2017. Available from: http://ri.ues.edu.sv/15526/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Edinburgh
16.
Mill, Frank.
Shape and topology optimisation for manufactured products.
Degree: 2003, University of Edinburgh
URL: http://hdl.handle.net/1842/12659
► The work described represents the candidate’s research in the area of engineering component representation, particularly in the context of constrained optimisation. Early papers describe a…
(more)
▼ The work described represents the candidate’s research in the area of engineering component representation, particularly in the context of constrained optimisation. Early papers describe a general approach to detail design that has since become commonplace, however, the advances that were hoped for in some downstream applications are proving more elusive. Whilst the early work describes constraint generation later work looks at different approaches to the shape and topology optimisation problems. The latest papers also include part of the candidate’s work in considering specific applications of parameterised manufacturing features.
Subjects/Keywords: 670
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APA (6th Edition):
Mill, F. (2003). Shape and topology optimisation for manufactured products. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/12659
Chicago Manual of Style (16th Edition):
Mill, Frank. “Shape and topology optimisation for manufactured products.” 2003. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/12659.
MLA Handbook (7th Edition):
Mill, Frank. “Shape and topology optimisation for manufactured products.” 2003. Web. 21 Sep 2019.
Vancouver:
Mill F. Shape and topology optimisation for manufactured products. [Internet] [Doctoral dissertation]. University of Edinburgh; 2003. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/12659.
Council of Science Editors:
Mill F. Shape and topology optimisation for manufactured products. [Doctoral Dissertation]. University of Edinburgh; 2003. Available from: http://hdl.handle.net/1842/12659
University of Edinburgh
17.
El-Kilani, Mohamad Abdullah.
A state dependent heuristic method of job shop scheduling.
Degree: 1992, University of Edinburgh
URL: http://hdl.handle.net/1842/14784
► The main object of this work is to develop a 'Fair Delivery and Shop State Dependent Scheduling dispatching rule' (FDSSD) in a job shop environment.…
(more)
▼ The main object of this work is to develop a 'Fair Delivery and Shop State Dependent Scheduling dispatching rule' (FDSSD) in a job shop environment. The fairness principle could be defined by saying that the customers who came first be given a higher priority than those who came afterwards. The basic principle behind the FDSSD rule is fairness towards customers. This is to some extent taken into account by the First Received First Served and Earliest Due Date scheduling rules. The FDSSD rule, however, takes into account both the order in which orders have been received and related delivery dates. Techniques which do not consider both of these criteria can produce unnecessary anomalies. These anomalies can often be overcome by human judgement in a relatively simple situation where results produced by logical scheduling may be immediately seen as unfair. The FDSSD rule introduces this moral element into logical scheduling. Because of this, many more anomalies which could adversely affect customers can be thrown out. The unecessary unfairness within the schedule may not be apparent to management until too much work has been done to change things. Owing to the moral principles introduced within the FDSSD rule, a direct comparison (one to one) with other scheduling rules does not exhibit the complete performance of the FDSSD rule. However, some comparisons based on tardiness criteria are made. Towards this end, a computer simulation model has been developed. The computer model is named herein as 'Job Shop Scheduling Simulation Model' (JSSM). The model has been used in improving the procedure of In-Process scheduling of the FDSSD rule. In contrast to the currently available scheduling rules which tend to be used, the FDSSD rule achieves a balance between the three main objectives of a production system. The objectives are: (i) to meet delivery dates,: (ii) to decrease Work-In-Process (WIP), and (iii) to increase machine utilisation. This balance compromises the Fairness Principle. The FDSSD rule uses First Received First Served rule (FRFS), delivery date consideration and state in the shop. The FDSSD rule offers a very close result if not better than some other known rules such as FRFS, FCFS and EDD rules.
Subjects/Keywords: 670
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APA (6th Edition):
El-Kilani, M. A. (1992). A state dependent heuristic method of job shop scheduling. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/14784
Chicago Manual of Style (16th Edition):
El-Kilani, Mohamad Abdullah. “A state dependent heuristic method of job shop scheduling.” 1992. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/14784.
MLA Handbook (7th Edition):
El-Kilani, Mohamad Abdullah. “A state dependent heuristic method of job shop scheduling.” 1992. Web. 21 Sep 2019.
Vancouver:
El-Kilani MA. A state dependent heuristic method of job shop scheduling. [Internet] [Doctoral dissertation]. University of Edinburgh; 1992. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/14784.
Council of Science Editors:
El-Kilani MA. A state dependent heuristic method of job shop scheduling. [Doctoral Dissertation]. University of Edinburgh; 1992. Available from: http://hdl.handle.net/1842/14784
De Montfort University
18.
Chen, Xi.
Component-based control system development for agile manufacturing machine systems.
Degree: PhD, 2003, De Montfort University
URL: http://hdl.handle.net/2086/13263
► It is now a common sense that manufactures including machine suppliers and system integrators of the 21 st century will need to compete on global…
(more)
▼ It is now a common sense that manufactures including machine suppliers and system integrators of the 21 st century will need to compete on global marketplaces, which are frequently shifting and fragmenting, with new technologies continuously emerging. Future production machines and manufacturing systems need to offer the "agility" required in providing responsiveness to product changes and the ability to reconfigure. The primary aim for this research is to advance studies in machine control system design, in the context of the European project VIR-ENG - "Integrated Design, Simulation and Distributed Control of Agile Modular Machinery".
Subjects/Keywords: 670
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APA (6th Edition):
Chen, X. (2003). Component-based control system development for agile manufacturing machine systems. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/13263
Chicago Manual of Style (16th Edition):
Chen, Xi. “Component-based control system development for agile manufacturing machine systems.” 2003. Doctoral Dissertation, De Montfort University. Accessed September 21, 2019.
http://hdl.handle.net/2086/13263.
MLA Handbook (7th Edition):
Chen, Xi. “Component-based control system development for agile manufacturing machine systems.” 2003. Web. 21 Sep 2019.
Vancouver:
Chen X. Component-based control system development for agile manufacturing machine systems. [Internet] [Doctoral dissertation]. De Montfort University; 2003. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/2086/13263.
Council of Science Editors:
Chen X. Component-based control system development for agile manufacturing machine systems. [Doctoral Dissertation]. De Montfort University; 2003. Available from: http://hdl.handle.net/2086/13263
University of Edinburgh
19.
Wang, Yongji.
Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots.
Degree: PhD, 1995, University of Edinburgh
URL: http://hdl.handle.net/1842/13201
► This dissertation presents a comprehensive and systematic investigation of some fundamental issues relating to creating an autonomous wheeled mobile robot (WMR). The forms of WMRs…
(more)
▼ This dissertation presents a comprehensive and systematic investigation of some fundamental issues relating to creating an autonomous wheeled mobile robot (WMR). The forms of WMRs with various structures developed in the past are first classified into four groups according to the method of steering and powering. The four groups are: a. ordinary car-like robots (including passenger cars, single trucks, single unit buses and articulated trucks); b. dual drive robots (dual drive motors with various casters); c. synchro drive and steering robots; and d. omnidirectional robots. The concepts of inverse and direct kinematics widely used in non-mobile manipulators are, for the first time, introduced to WMRs, and a unified treatment of the kinematics for the four kinds of WMRs is presented. A motion feasibility and smoothness analysis for each of them is carried out, revealing the motion characteristics resulting from each of the different mechanical structures. This provides a better understanding of their motion characteristics and forms the basis for discussing the path planning problem. The concept of deviation angle interval is defined and used to explain the strange phenomenon of a pirouette. The conditions and formula for pure translation, pure rotation, straight line motion and circular motion are developed. In order to verify the correctness and to illustrate the advantages of the developed kinematic model, the simulation results from the present model are compared with the existing standards from other kinematic models. Path planning is essential for creating an autonomous robot. Various methods for dealing with the find-path problem have been developed in the past. Based on the motion analysis of the four kinds of WMRs, a critical review of the presently available algorithms for moving a WMR among known static obstacles from a given start location to a given goal location is presented, and the suitability of the existing algorithms to each of the four kinds of WMRs is examined.
Subjects/Keywords: 670
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APA (6th Edition):
Wang, Y. (1995). Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/13201
Chicago Manual of Style (16th Edition):
Wang, Yongji. “Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots.” 1995. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/13201.
MLA Handbook (7th Edition):
Wang, Yongji. “Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots.” 1995. Web. 21 Sep 2019.
Vancouver:
Wang Y. Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots. [Internet] [Doctoral dissertation]. University of Edinburgh; 1995. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/13201.
Council of Science Editors:
Wang Y. Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots. [Doctoral Dissertation]. University of Edinburgh; 1995. Available from: http://hdl.handle.net/1842/13201
Loughborough University
20.
Whitworth, David P. D.
Tension variations in pliable material in production machinery.
Degree: PhD, 1979, Loughborough University
URL: https://dspace.lboro.ac.uk/2134/8427
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.477175
► Many production machines are used in which flexible material is processed. In these machines, cyclic tension variations can be induced in the material by interaction…
(more)
▼ Many production machines are used in which flexible material is processed. In these machines, cyclic tension variations can be induced in the material by interaction with the machine components. At resonance, these variations can be large and may result in breakage or distortion of the material. It is important to determine these resonant frequencies, and their dependence on the machine parameters, to help avoid these problems at the machine design stage. A mathematical model of such machines has been developed. Materials with linear elastic and linear visco-elastic tensile properties have been considered. The effects of friction between material and guide rollers have been included. A numerical method has been used to solve the resulting differential equations. This method gives accurate results even when adhesion between the material and some machine components is lost. By assuming the tension perturbations proportionately small, an approximate linear model was derived. It was found to give resonant frequencies close to those predicted by the non-linear model, but gave less accurate estimates of the amplitudes at resonance. For the linear model orthogonality relations for the eigenvectors were derived. Using these relations expressions were obtained which are first order approximations to the amplitudes of oscillation at resonance. The amplitudes are related to the angles of wrap round the rollers and, in the visco-elastic case, to the loss factor of the material. In addition, the expressions determine how the amplitudes are related to the position of the corresponding span in the system. Expressions were also found using perturbation theory. They give the local variation of the resonant frequencies with respect to the span lengths and moments of inertia of components of the system. These relations are used to carry out an analysis of certain types of system. Experimental work has been carried out, using a closed loop of material, to test the predictions of the mathematical model. A variety of materials was used with several different systems of rollers. In general, the results show that the resonant frequencies detected corresponded closely with those predicted, but the amplitudes tended to be over-estimated. Finally a programme of work was carried out on a production machine, and the results compared with model predictions.
Subjects/Keywords: 670
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APA (6th Edition):
Whitworth, D. P. D. (1979). Tension variations in pliable material in production machinery. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/8427 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.477175
Chicago Manual of Style (16th Edition):
Whitworth, David P D. “Tension variations in pliable material in production machinery.” 1979. Doctoral Dissertation, Loughborough University. Accessed September 21, 2019.
https://dspace.lboro.ac.uk/2134/8427 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.477175.
MLA Handbook (7th Edition):
Whitworth, David P D. “Tension variations in pliable material in production machinery.” 1979. Web. 21 Sep 2019.
Vancouver:
Whitworth DPD. Tension variations in pliable material in production machinery. [Internet] [Doctoral dissertation]. Loughborough University; 1979. [cited 2019 Sep 21].
Available from: https://dspace.lboro.ac.uk/2134/8427 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.477175.
Council of Science Editors:
Whitworth DPD. Tension variations in pliable material in production machinery. [Doctoral Dissertation]. Loughborough University; 1979. Available from: https://dspace.lboro.ac.uk/2134/8427 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.477175
21.
Pask, Frederick.
Systematic engineering of industrial ovens.
Degree: Thesis (Eng.D.), 2017, University of Surrey
URL: http://epubs.surrey.ac.uk/813216/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546
► This research is aimed at improving low-grade industrial ovens (less than 250°C) in the manufacturing industry. Industrial ovens have a significant bearing on the environmental…
(more)
▼ This research is aimed at improving low-grade industrial ovens (less than 250°C) in the manufacturing industry. Industrial ovens have a significant bearing on the environmental and economic impacts of a manufacturing factory due to their excessive fossil fuel consumption and influence on product quality. Therefore, this thesis’ research question is: 'How can manufacturers improve the environmental and economic performance of industrial ovens?' Research on industrial oven improvement is under-developed and there are significant improvement opportunities within many industrial-heating processes. Manufacturers traditionally prioritise economic assessment when evaluating capital investment projects and it is important that systematic engineering of industrial ovens align energy saving and process enhancement with key business interests. Furthermore, there is a need to incorporate stakeholder perspectives when improving oven processes. This thesis consists of three bodies of research, which all develop ways to improve the environmental and economic performance of industrial ovens: 1) Energy saving through process optimisation, 2) Process enhancement considering both energy consumption and product quality, 3) Developing sustainable industrial ovens. The key research outputs from this thesis are shown below: • There are two options to reduce energy consumption; to optimise the process by changing parameters, or to innovate the process by changing the way the heat is supplied to an oven. • System airflow can often be reduced by up to 30%. This was demonstrated at two factories and three oven systems, and has reduced gas energy consumption by 4,536,000 kWh and cut carbon emissions by 836 tCO2e per year. This has delivered a combined annual cost saving of £121,000. • Installing sufficient control capability enables heating processes to be optimised throughout their life, to meet changing requirements. • A novel approach of polymer cure characterisation has been developed that combines DMTA and a free phenol/CIE-Lch test. This demonstrated that temperature variation within a festoon oven results in dramatically different cure conversion (complete conversion time ranges from 73 to 40 minutes depending on location) and product quality. • A novel multi-criteria analysis method incorporating sustainability indicators from stakeholder’s perspectives has been developed for oven optimisation. • Retrofitting gas-fuelled processes with biomass technology is not economically viable. Alternative schemes that negate capital cost from the business would significantly enhance biomass viability. • Biomass technology is more viable in newly-built processes than retrofit scenarios. • EU Emission Trading Scheme (ETS) is an effective tool to encourage uptake of biomass heating technology in the manufacturing industry. This study demonstrates that there is opportunity to improve low-grade heating processes in the manufacturing industry. The environmental and economic performance of industrial ovens can, and should, be improved to help the…
Subjects/Keywords: 670
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APA (6th Edition):
Pask, F. (2017). Systematic engineering of industrial ovens. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546
Chicago Manual of Style (16th Edition):
Pask, Frederick. “Systematic engineering of industrial ovens.” 2017. Doctoral Dissertation, University of Surrey. Accessed September 21, 2019.
http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546.
MLA Handbook (7th Edition):
Pask, Frederick. “Systematic engineering of industrial ovens.” 2017. Web. 21 Sep 2019.
Vancouver:
Pask F. Systematic engineering of industrial ovens. [Internet] [Doctoral dissertation]. University of Surrey; 2017. [cited 2019 Sep 21].
Available from: http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546.
Council of Science Editors:
Pask F. Systematic engineering of industrial ovens. [Doctoral Dissertation]. University of Surrey; 2017. Available from: http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546
University of Edinburgh
22.
Wren, David Owen.
Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories.
Degree: Thesis (D.Sc.), 1997, University of Edinburgh
URL: http://hdl.handle.net/1842/30950
► In this thesis a grasp metric based on stability and kinematic feasibility is introduced. The preshaping paradigm is extended to include consideration of the trajectories…
(more)
▼ In this thesis a grasp metric based on stability and kinematic feasibility is introduced. The preshaping paradigm is extended to include consideration of the trajectories that the digits take during closure from preshape to final grasp. The resulting <I>grasp strategy </I>is dependent upon task requirements and is designed for a set of "ideal" object-hand configurations. The grasp strategy couples the degrees of freedom of the dextrous hand in an anthropomorphic manner; the resulting reduction in degrees of freedom makes the grasp planning less complex. Grasp strategies are fitted to real objects by optimisation of the grasp metric; this corresponds to fitting the real object-hand configurations as close to the ideal as possible. First, the <I>preshape aperture, </I>which defines the positions of the fingertips in the preshape, is found by optimisation of an approximation to the grasp metric (which makes simplifying assumptions about the digit trajectories and hand kinematics). Second, the full preshape kinematics and digit closure trajectories are calculated to optimise the full grasp metric. Grasps are planned on object descriptions built from laser striper range data from two viewpoints. A surface description of the object is used to prune the space of possible contact sites and to allow the accurate estimation of surface normals, which is required by the grasp metric to estimate the amount of friction required. A voxel description, built by ray-casting, is used to check for collisions between the object and the robot hand using an approximation to the Euclidean distance transform. Results are shown in simulation for a 3-digit hand model, designed to be like a simplified human hand in terms of its size and functionality. There are clear extensions of the method to any dextrous hand with a single thumb opposing multiple fingers and several different hand models that could be used are described. Grasps are planned on a wide variety of curved and polyhedral objects.
Subjects/Keywords: 670
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APA (6th Edition):
Wren, D. O. (1997). Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/30950
Chicago Manual of Style (16th Edition):
Wren, David Owen. “Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories.” 1997. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/30950.
MLA Handbook (7th Edition):
Wren, David Owen. “Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories.” 1997. Web. 21 Sep 2019.
Vancouver:
Wren DO. Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories. [Internet] [Doctoral dissertation]. University of Edinburgh; 1997. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/30950.
Council of Science Editors:
Wren DO. Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories. [Doctoral Dissertation]. University of Edinburgh; 1997. Available from: http://hdl.handle.net/1842/30950
University of Edinburgh
23.
Bispo, Edvaldo Marques.
An analysis of the inspection of mechanical parts using dense range data.
Degree: PhD, 1996, University of Edinburgh
URL: http://hdl.handle.net/1842/21612
► More than ever, efficiency and quality are key words in modern industry. This situation enhances the importance of quality control and creates a great demand…
(more)
▼ More than ever, efficiency and quality are key words in modern industry. This situation enhances the importance of quality control and creates a great demand for cheap and reliable automatic inspection systems. Taking into account these facts and the demand for systems able to inspect the final shape of machined parts, we decided to investigate the viability of automatic model-based inspection of mechanical parts using the dense range data produced by laser stripers. Given a part to be inspected and a corresponding model of the part stored in the model data base, the first step of inspecting the part is the acquisition of data corresponding to the part, in our case this means the acquisition of a range image of it. In order to be able to compare the part image and its stored model, it is necessary to align the model with the range image of the part. This process, called registration, corresponds to finding the rigid transformation that superposes model and image. After the image and model are registered, the actual inspection uses the range image to verify if all the features predicted in the model are present and have the right pose and dimensions. Therefore, besides the acquisition of range images, the inspection of machined parts involves three main issues: modelling, registration and inspection diagnosis. The application, for inspection purposes, of the main representational schemes for modelling solid objects is discussed and it is suggested the use of EDT models (see [Zeid 91]). A particular implementation of EDT models is presented. A novel approach for the verification of tolerances during the inspection is proposed. The approach allows not only the inspection of the most common tolerances described in the tolerancing standards, but also the inspection of tolerances defined according to Requicha's theory of tolerancing (see [Requicha 83]). A model of the sensitivity and reliability of the inspection process based on the modelling of the errors during the inspection process is also proposed. The importance of the accuracy of the registration in different inspections tasks is discussed. A modified version of the ICP algorithm (see [Besl &; McKay 92]) for the registration of sculptured surfaces is proposed. The maximum accuracy of the ICP algorithm, as a function of the sensor errors and the number of matched points, is determined. A novel method for the measurement and reconstruction of waviness errors on sculp¬ tured surfaces is proposed. The method makes use of the 2D Discrete Fourier Transform for the detection and reconstruction of the waviness error. A model of the sensitivity and reliability of the method is proposed. The application of the methods proposed is illustrated using synthetic and real range images.
Subjects/Keywords: 670
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APA (6th Edition):
Bispo, E. M. (1996). An analysis of the inspection of mechanical parts using dense range data. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/21612
Chicago Manual of Style (16th Edition):
Bispo, Edvaldo Marques. “An analysis of the inspection of mechanical parts using dense range data.” 1996. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/21612.
MLA Handbook (7th Edition):
Bispo, Edvaldo Marques. “An analysis of the inspection of mechanical parts using dense range data.” 1996. Web. 21 Sep 2019.
Vancouver:
Bispo EM. An analysis of the inspection of mechanical parts using dense range data. [Internet] [Doctoral dissertation]. University of Edinburgh; 1996. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/21612.
Council of Science Editors:
Bispo EM. An analysis of the inspection of mechanical parts using dense range data. [Doctoral Dissertation]. University of Edinburgh; 1996. Available from: http://hdl.handle.net/1842/21612
Cranfield University
24.
Farrell, J.
Hyperbaric welding of duplex stainless steel pipelines offshore.
Degree: PhD, 1996, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/4513
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126
► Three duplex stainless steels (Avesta 2205, Sandvik SAF2507 and Zeron 100) were successfully welded automatically at a range of pressures from 1 to 32bar. The…
(more)
▼ Three duplex stainless steels (Avesta 2205, Sandvik SAF2507 and Zeron 100) were successfully welded automatically at a range of pressures from 1 to 32bar. The gas tungsten arc (GTA) welding process was chosen as it allows a high degree of control to be exercised during welding. Initial autogenous bead on plate welds established the effects of pressure on the welding process and allowed the process parameters to be determined for subsequent experiments. Analysis of the effects of pressure on the weld thermal cycle showed that at higher pressures the precipitation of phases deleterious to the weld quality was less likely than at ambient pressure. It was also found that the arc melting efficiency increased as the pressure increased, which was taken into account when the process parameters for the joints were selected. A V-butt design with a 'land' on each side was chosen for the joints to counteract any tendency for the welding arc to wander at higher welding pressures. The root welds were performed using pulsed current welding techniques to overcome the difficulties in achieving consistent penetration that were encountered when welding at lower pressures. It was found that by employing standard welding consumables commonly used for welding duplex steels at ambient pressure satisfactory austenite-ferrite phase balances could be achieved in the weld metal at all pressures. Metallographic examination of the welds showed that the joints did not have any microstructural complications that were related to pressure and mechanical testing revealed that, in terms of impact toughness, the weld metal and heat affected zone (HAZ) performed as well as, if not better than, the parent plate material. This work shows that welding of duplex stainless steels using the hyperbaric welding method is a viable option for subsea operations up to a depth of at least 320m, automated hyperbaric welding being advantageous at depths greater than 40m.
Subjects/Keywords: 670
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APA (6th Edition):
Farrell, J. (1996). Hyperbaric welding of duplex stainless steel pipelines offshore. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126
Chicago Manual of Style (16th Edition):
Farrell, J. “Hyperbaric welding of duplex stainless steel pipelines offshore.” 1996. Doctoral Dissertation, Cranfield University. Accessed September 21, 2019.
http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126.
MLA Handbook (7th Edition):
Farrell, J. “Hyperbaric welding of duplex stainless steel pipelines offshore.” 1996. Web. 21 Sep 2019.
Vancouver:
Farrell J. Hyperbaric welding of duplex stainless steel pipelines offshore. [Internet] [Doctoral dissertation]. Cranfield University; 1996. [cited 2019 Sep 21].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126.
Council of Science Editors:
Farrell J. Hyperbaric welding of duplex stainless steel pipelines offshore. [Doctoral Dissertation]. Cranfield University; 1996. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126
University of Edinburgh
25.
Kim, Taehee.
Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot.
Degree: PhD, 1996, University of Edinburgh
URL: http://hdl.handle.net/1842/34880
► The research presented in this thesis focuses on the development of tactile event signature sensors and their application, especially in reactive behaviour-based robotic assembly systems.…
(more)
▼ The research presented in this thesis focuses on the development of tactile event signature sensors and their application, especially in reactive behaviour-based robotic assembly systems. In pursuit of practical and economic sensors for detecting part contact, the application of PVDF (polyvinylidene fluoride) film, a mechanical vibration sensitive piezo material, is investigated. A <I>Clunk Sensor</I> is developed which remotely detects impact vibrations, and a <I>Push Sensor</I> is developed which senses small changes in the deformation of a compliant finger surface. The <I>Push Sensor</I> is further developed to provide some force direction and force pattern sensing capability. By being able to detect changes of state in an assembly, such as a change of contact force, an assembly robot can be well informed of current conditions. The complex structure of assembly tasks provides a rich context within which to interpret changes of state, so simple binary sensors can conveniently supply a lot more information than in the domain of mobile robots. Guarded motions, for example, which require sensing a change of state, have long been recognised as very useful in part mating tasks. Guarded motions are particularly well suited to be components of assembly behavioural modules. In behaviour-based robotic assembly systems, the high level planner is endowed with as little complexity as possible while the low level planning execution agent deals with actual sensing and action. Highly reactive execution agents can provide advantages by encapsulating low level sensing and action, hiding the details of sensori-motor complexity from the higher levels. Because behaviour-based assembly systems emphasise the utility of this kind of qualitative state-change sensor (as opposed to sensors which measure physical quantities), the robustness and utility of the <I>Push Sensor</I> was tested in an experimental behaviour-based system. An experimental task of pushing a ring along a convoluted stiff wire is chosen, in which the tactile sensors developed here are aided by vision. Three different methods of combining these different sensors within the general behaviour-based paradigm are implemented and compared. This exercise confirms the robustness and utility of the PVDF-based tactile sensors. We argue that the comparison suggests that for behaviour-based assembly systems using multiple concurrent sensor systems, bottom-level motor control in terms of force or velocity would be more appropriate than positional control. Behaviour-based systems have traditionally tried to avoid symbolic knowledge. Considering this in the light of the above work, it was found useful to develop a taxonomy of type of knowledge and refine the prohibition.
Subjects/Keywords: 670
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APA (6th Edition):
Kim, T. (1996). Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/34880
Chicago Manual of Style (16th Edition):
Kim, Taehee. “Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot.” 1996. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/34880.
MLA Handbook (7th Edition):
Kim, Taehee. “Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot.” 1996. Web. 21 Sep 2019.
Vancouver:
Kim T. Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot. [Internet] [Doctoral dissertation]. University of Edinburgh; 1996. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/34880.
Council of Science Editors:
Kim T. Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot. [Doctoral Dissertation]. University of Edinburgh; 1996. Available from: http://hdl.handle.net/1842/34880
University of Edinburgh
26.
Guo, Li.
Enacting a decentralised workflow management system on a multi-agent platform.
Degree: PhD, 2007, University of Edinburgh
URL: http://hdl.handle.net/1842/24658
► This thesis presents sets of technologies for enacting multi-agent based decentralised workflow systems. Its purpose is to tackle some of the existing problems in the…
(more)
▼ This thesis presents sets of technologies for enacting multi-agent based decentralised workflow systems. Its purpose is to tackle some of the existing problems in the conventional workflow research from the system architectural and engineering point of view. Some of the problems addressed at the beginning of this thesis have affected the wide deployment of workflow management system in an open environment (internet). This thesis argues that most of these problems are caused by the huge conceptual gap and design rationale between high level application requirements and low level system design/implementation. Specifically, it is argued that the conventional system architecture of workflow management system (client-server) could be replaced by a multi-agent based platform which is more open, collaborative and can better reflect workflow’s distributed features in the open environment. Combining existing workflow design rationale and multi-agent computing technology, a multi-agent based decentralised workflow approach is proposed in this thesis. The architecture of the intended system removes both the centralised data storage and the centralised workflow engine from the system. To achieve this goal, approaches that bridge the gap between the business process modelling and multi-agent interaction protocol production are proposed using three different techniques (namely functional properties based specifications verification, syntax based language mapping and interpretation based communication) according to the different types of business process models used. Based on such approaches, the mechanisms for decentralised process execution are explored. Moreover, our system is also able to be extended to support incompletely/partially specified processes in a distributed manner. The approach for handling such incomplete/partially specified processes at run-time are presented in this thesis. The main contributions of this research are to provide approaches for enabling decentralised workflow systems in an open environment based on a multi-agent platform without changing the conventional workflow design rationale and with maximum use of existing process models and tools.
Subjects/Keywords: 670
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APA (6th Edition):
Guo, L. (2007). Enacting a decentralised workflow management system on a multi-agent platform. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/24658
Chicago Manual of Style (16th Edition):
Guo, Li. “Enacting a decentralised workflow management system on a multi-agent platform.” 2007. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/24658.
MLA Handbook (7th Edition):
Guo, Li. “Enacting a decentralised workflow management system on a multi-agent platform.” 2007. Web. 21 Sep 2019.
Vancouver:
Guo L. Enacting a decentralised workflow management system on a multi-agent platform. [Internet] [Doctoral dissertation]. University of Edinburgh; 2007. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/24658.
Council of Science Editors:
Guo L. Enacting a decentralised workflow management system on a multi-agent platform. [Doctoral Dissertation]. University of Edinburgh; 2007. Available from: http://hdl.handle.net/1842/24658
University of Edinburgh
27.
Cranefield, Stephen John Scott.
Planning for behaviour-based robotic assembly : a logical framework.
Degree: PhD, 1991, University of Edinburgh
URL: http://hdl.handle.net/1842/23820
► This thesis describes an approach to robotic assembly planning based on a logic of <i>plan specification</i> formulae. These formulae consist of a term representing the…
(more)
▼ This thesis describes an approach to robotic assembly planning based on a logic of <i>plan specification</i> formulae. These formulae consist of a term representing the plan, a description of the states before and after the plan is performed (using a simple but structured world model), and a set of literals which can be evaluated as Prolog goals to test preconditions and generate terms to appear in the postconditions. The specifications for the atomic actions are given as axioms and planning takes place by attempting to prove the specification for the desired plan, decomposing it by the reverse application of inference rules that state how the specification for a plan can be deduced from those of its subplans. These are derived from the definitions of the temporal operators that are used to construct plans. The initial plan may be partially instantiated due to prior constraints on the form of the plan, and the remaining plan variables and atomic action parameters will be instantiated during the course of planning. The planning strategy is expressed using goal-decomposing 'tactics'. The representation of world states is defined using equational logic and (equational) unification is used to 'match' these <i>state specifications</i>. The form of this logic is designed to meet the requirements of <i>behaviour-based</i> systems such as Edinburgh's SOMASS system, which is described in this thesis, and to allow various temporal languages to be used to represent plans, in order to investigate their uses and to develop appropriate planning strategies.
Subjects/Keywords: 670
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APA (6th Edition):
Cranefield, S. J. S. (1991). Planning for behaviour-based robotic assembly : a logical framework. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/23820
Chicago Manual of Style (16th Edition):
Cranefield, Stephen John Scott. “Planning for behaviour-based robotic assembly : a logical framework.” 1991. Doctoral Dissertation, University of Edinburgh. Accessed September 21, 2019.
http://hdl.handle.net/1842/23820.
MLA Handbook (7th Edition):
Cranefield, Stephen John Scott. “Planning for behaviour-based robotic assembly : a logical framework.” 1991. Web. 21 Sep 2019.
Vancouver:
Cranefield SJS. Planning for behaviour-based robotic assembly : a logical framework. [Internet] [Doctoral dissertation]. University of Edinburgh; 1991. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/1842/23820.
Council of Science Editors:
Cranefield SJS. Planning for behaviour-based robotic assembly : a logical framework. [Doctoral Dissertation]. University of Edinburgh; 1991. Available from: http://hdl.handle.net/1842/23820
28.
Nadiri, F.
Polymer melt flow in cable covering equipment.
Degree: PhD, 1979, Imperial College London
URL: http://hdl.handle.net/10044/1/34968
Subjects/Keywords: 670
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APA (6th Edition):
Nadiri, F. (1979). Polymer melt flow in cable covering equipment. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/34968
Chicago Manual of Style (16th Edition):
Nadiri, F. “Polymer melt flow in cable covering equipment.” 1979. Doctoral Dissertation, Imperial College London. Accessed September 21, 2019.
http://hdl.handle.net/10044/1/34968.
MLA Handbook (7th Edition):
Nadiri, F. “Polymer melt flow in cable covering equipment.” 1979. Web. 21 Sep 2019.
Vancouver:
Nadiri F. Polymer melt flow in cable covering equipment. [Internet] [Doctoral dissertation]. Imperial College London; 1979. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/10044/1/34968.
Council of Science Editors:
Nadiri F. Polymer melt flow in cable covering equipment. [Doctoral Dissertation]. Imperial College London; 1979. Available from: http://hdl.handle.net/10044/1/34968
29.
Watts, Anthony Bertram.
The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling.
Degree: PhD, 1953, Imperial College London
URL: http://hdl.handle.net/10044/1/12430
Subjects/Keywords: 670
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APA (6th Edition):
Watts, A. B. (1953). The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/12430
Chicago Manual of Style (16th Edition):
Watts, Anthony Bertram. “The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling.” 1953. Doctoral Dissertation, Imperial College London. Accessed September 21, 2019.
http://hdl.handle.net/10044/1/12430.
MLA Handbook (7th Edition):
Watts, Anthony Bertram. “The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling.” 1953. Web. 21 Sep 2019.
Vancouver:
Watts AB. The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling. [Internet] [Doctoral dissertation]. Imperial College London; 1953. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/10044/1/12430.
Council of Science Editors:
Watts AB. The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling. [Doctoral Dissertation]. Imperial College London; 1953. Available from: http://hdl.handle.net/10044/1/12430
30.
Whitton, Peter William.
An investigation of the surface friction in cold rolling.
Degree: PhD, 1953, Imperial College London
URL: http://hdl.handle.net/10044/1/12431
Subjects/Keywords: 670
Record Details
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APA (6th Edition):
Whitton, P. W. (1953). An investigation of the surface friction in cold rolling. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/12431
Chicago Manual of Style (16th Edition):
Whitton, Peter William. “An investigation of the surface friction in cold rolling.” 1953. Doctoral Dissertation, Imperial College London. Accessed September 21, 2019.
http://hdl.handle.net/10044/1/12431.
MLA Handbook (7th Edition):
Whitton, Peter William. “An investigation of the surface friction in cold rolling.” 1953. Web. 21 Sep 2019.
Vancouver:
Whitton PW. An investigation of the surface friction in cold rolling. [Internet] [Doctoral dissertation]. Imperial College London; 1953. [cited 2019 Sep 21].
Available from: http://hdl.handle.net/10044/1/12431.
Council of Science Editors:
Whitton PW. An investigation of the surface friction in cold rolling. [Doctoral Dissertation]. Imperial College London; 1953. Available from: http://hdl.handle.net/10044/1/12431
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Open Access Theses and Dissertations
