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Computer-aided design and manufacturing of tactile mapsChan, Chi-fung, 陳智鋒 January 2007 (has links)
published_or_final_version / abstract / Mechanical Engineering / Master / Master of Philosophy
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Incorporating GIS and CAD technologies in the modelling of three-dimensional urban landscape of Hong KongHo, Lee-kin, Joe., 何利堅. January 1999 (has links)
published_or_final_version / Geography and Geology / Master / Master of Philosophy
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Automated feature recognition system for supporting engineering activities downstream of conceptual design.Jones, Timothy, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW January 2007 (has links)
Transfer of information between CAD models and downstream manufacturing process planning software typically involves redundant user interaction. Many existing tools are process-centric and unsuited for selection of a "best process" in the context of existing concurrent engineering design tools. A computer based Feature-Recognition (FR) process is developed to extract critical manufacturing features from engineering product CAD models. FR technology is used for automating the extraction of data from CAD product models and uses wire-frame geometry extracted from an IGES neutral file format. Existing hint-based feature recognition techniques have been extended to encompass a broader range of manufacturing domains than typical in the literature, by utilizing a combination of algorithms, each successful at a limited range of features. Use of wire-frame models simplifies product geometry and has the potential to support rapid manufacturing shape evaluation at the conceptual design stage. Native CAD files are converted to IGES neutral files to provide geometry data marshalling to remove variations in user modelling practice, and to provide a consistent starting point for FR operations. Wire-frame models are investigated to reduce computer resources compared to surface and solid models, and provide a means to recover intellectual property in terms of manufacturing design intent from legacy and contemporary product models. Geometric ambiguity in regard to what is ?solid? and what is not has plagued wire-frame FR development in the past. A new application of crossing number theory (CNT) has been developed to solve the wire-frame ambiguity problem for a range of test parts. The CNT approach works satisfactorily for products where all faces of the product can be recovered and is tested using a variety of mechanical engineering parts. Platform independent tools like Extensible Mark-up Language are used to capture data from the FR application and provide a means to separate FR and decision support applications. Separate applications are composed of reusable software modules that may be combined as required. Combining rule-based and case-based reasoning provides decision support to the manufacturing application as a means of rejecting unsuitable processes on functional and economic grounds while retaining verifiable decision pathways to satisfy industry regulators.
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Computer-aided design and manufacturing of tactile mapsChan, Chi-fung, January 2007 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.
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The design capture system : capturing back-of-the-envelope sketchesHwang, Teng-shang 16 July 1990 (has links)
A system which allows the computer to capture sketches
made by a mechanical designer is described. The system not
only recognizes basic features as they are sketched, but it
also reasons the spatial relationships between features and
builds a high level abstract representation (feature model)
of the artifact. The temporal nature of the capture, one
feature at a time, serves to form a feature graph that
allows for parametric design. The system is composed of
three subsystems: a two-dimensional freehand sketching
subsystem¹ , a three-dimensional features recognition
subsystem, and a spatial reasoning subsystem.
The freehand sketching subsystem takes the user's
input sketching actions and interprets them as simple, two-dimensional
geometric elements, such as line segments,
circles, and ellipses, etc. The features recognition
subsystem interprets the collection of two-dimensional
geometric elements to extract three-dimensional information
from them and creates high level abstract representations,
features. The spatial reasoning subsystem finds
relationships between a new feature and existing features
and integrates features to form a single part.
The work of the Design Capture System is aimed at
capturing sketches of a specific application domain:
injected molding plastic parts. Twenty injected molding
plastic parts were collected and analyzed to understand the
distribution of features.
Isometric sketching is selected as the basic
constructing method for the system. The processes of
freehand sketching and computer-aided drafting were studied
to find a better scheme for computer-aided sketching.
Conclusions are also presented.
¹The Freehand Sketching Subsystem was accomplished by
Roger Fang as a Master project in 1987 at the Department of
Mechanical Engineering, Oregon State University, Corvallis,
Oregon. / Graduation date: 1991
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A CAD/CAM system for sheet metal blanking dies黃啓榮, Wong, Kai-wing. January 1991 (has links)
published_or_final_version / Industrial and Manufacturing Systems Engineering / Master / Master of Philosophy
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Data base optimisation for an I.C. design layout package on the VAX.Figg, P. G. January 1987 (has links)
The performance of an interactive graphics/computer aided design system, such as the IC layout and rule checking package implemented as part of the
schematic drawing application on the Gerber Systems Technology IDS-80, is
very closely related to the performance of the system's data base. This is due to the fact that most editing functions on an interactive graphics/CAD system are data base intensive functions and the data base and its management routines form one of the major building blocks of a CAD system. It can therefore be said that the performance of a CAD system is directly dependent on the data base access time and the efficiency of the managing routines.
The primary objective of this project was to enhance the performance of the IC
layout and rule checking package. This was done by improving the performance of the data base of the system. This was achieved by following two mutually supportive paths. The first was the transportation of the software to a new host machine which had a 32-bit processor and virtual memory capabilities. The second was to try and improve the performance of the transported data base by utilising sophisticated data base structures and memory management·techniques facilitated by the larger available memory of the new host to optimise the data base operations. The effectiveness of the two paths in achieving their respective goals was evaluated using evaluation programs which simulated characteristic data base activities.This thesis documents the above process, as well as expounds on some of the
background related theory which was instrumental in the progress of the project and the drawing of the final conclusions. / Thesis (M.Sc.)-University of Natal, Durban, 1987.
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A hybrid reconfigurable computer integrated manufacturing cell for mass customisation.Hassan, N. January 2011 (has links)
Mass producing custom products requires an innovative type of manufacturing environment.
Manufacturing environments at present do not possess the flexibility to generate mass
produced custom products. Manufacturers’ rapid response in producing these custom
products in relation to demand, yields several beneficial results from both a customer and
financial perspective. Current reconfigurable manufacturing environments are yet neither
financially feasible nor viable to implement. To provide a solution to the production of mass
customised products, research can facilitate the development of a distinctive hybrid
manufacturing cell, composed of characteristics inherent in existing manufacturing
paradigms.
Distinctive hybrid manufacturing cell research and development forms an environment
where Computer Integrated Manufacturing (CIM) cells operate in a Reconfigurable
Manufacturing environment. The development of this Hybrid Reconfigurable Computer
Integrated Manufacturing (HRCIM) cell resulted in functionalities that enabled the
production of mass customised products. Manufacturing characteristics of the HRCIM cell
were composed of key Reconfigurable Manufacturing System (RMS) features and CIM
capabilities.
This project required hardware to be used in developing an integrated HRCIM cell.
The cell consisted of storage systems, material handling equipment and processing stations.
Specific material handling equipment was enhanced in its functionality by incorporating
RMS characteristics to its existing structure. The hardware behaviour was coordinated from
software. This facilitated the autonomous HRCIM cell behaviour which was derived from
the mechatronic approach. The software composed of HRCIM events that were defined by
its unique programming language. Highlighted software functionalities included
prioritisation scheduling that resulted from customer order input. Performance data, extracted
from each type of equipment, were used to parameterise a simulated HRCIM cell. During
operation, the cell was frequently introduced to an irregular flow of different product
geometries, which required different processing requirements. This irregularity represented
mass customisation. The simulated HRCIM cell provided detailed manufacturing results.
Significant results consisted of storage times, queueing times and cycle times. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2011.
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Accuracy models for SLA build style decision supportLynn, Charity M. 12 1900 (has links)
No description available.
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The analyzable product model representation to support design-analysis integrationTamburini, Diego Romano 05 1900 (has links)
No description available.
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