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Distributed control synthesis for manufacturing systems using customers' decision behaviour for mass customisation.Walker, Anthony John. January 2013 (has links)
The mass customisation manufacturing (MCM) paradigm has created a problem in manufacturing
control implementation, as each individual customer has the potential to disrupt
the operations of production. The aim of this study was to characterise the manufacturing
effects of customers’ decisions in product configuration, in order to research steady state
control requirements and work-in-process distributions for effective MCM operations. A
research method involving both analytic and empirical reasoning was used in characterising
the distributed control environment of manufacturing systems involved in MCM.
Sequences of job arrivals into each manufacturing system, due to customers’ decisions in
product configuration, were analysed as Bernoulli processes. A customer model based on
this analysis captured the correlation in product configuration decisions over time. Closed
form analytic models were developed from first principles, which described the steady state
behaviour of flow controlled manufacturing systems under generalised clearing policy and
uncorrelated job arrival sequences. Empirical analysis of data sets achieved through discrete
event simulation was used in adjusting the models to account for more complex cases
involving multiple job types and varying correlation. Characteristic response surfaces were
shown to exist over the domains of manufacturing system load and job arrival sequence
correlation.
A novel manufacturing flow control method, termed biased minimum feedback (BMF) was
developed. BMF was shown to posses the capability to distribute work-in-process within
the entire manufacturing facility through work-in-process regulation at each manufacturing
system, so as to increase the performance of downstream assembly stations fed from parallel
upstream processing stations. A case study in the production of a configurable product
was used in presenting an application for the models and methods developed during this
research. The models were shown to be useful in predicting steady state control requirements
to increase manufacturing performance. / Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2013.
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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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Hardware mapping of critical paths of a GaAs core processor for solid modelling accelerator / by Song Cui.Cui, Song January 1996 (has links)
Bibliography: leaves 200-207. / xi, 207 leaves : ill. ; 20 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The aim of this thesis is to design and implement the hardware mapping of critical paths of a GaAs Core Processor for a Solid Modelling Accelerator. The solid modelling accelerator is designed using GaAs/CMOS/B:CMOS unified technology. High speed GaAs technology is used in the core processor to deal with floating point intensive calculations, while CMOS technology is used where high speed outputs are not required. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1996
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Virtual manufacturing of pockets using end milling with multiple tool pathsPisipati, Deepak. January 2004 (has links)
Thesis (M.S.)--Ohio University, June, 2004. / Title from PDF t.p. Includes bibliographical references (leaves 96-99).
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Study of fixturing accessibilities in computer-aided fixture designGhatpande, Puja Sudhakar. January 2008 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Accessibility; CAM; CAD; Integration; Fixture Design. Includes bibliographical references (leaves 108-109).gh
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Computer-aided manufacturing planning (CAMP) of mass customization for non-rotational part productionYao, Suqin. January 2003 (has links)
Dissertation (Ph.D.) -- Worcester Polytechnic Institute. / Keywords: Computer aided manufacturing planning; Object-oriented systems analysis (OSA); Feature; manufacturing resource capability; setup planning; multi-part fixture Includes bibliographical references (p.146-154).
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A platform independent process data exchange mechanism between Java applications and computer aided manufacturing systemsJain, Vikesh. January 2003 (has links)
Thesis (M.S.)--Ohio University, November, 2003. / Title from PDF t.p. Includes bibliographical references (p. 112-115)
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Intelligent STL file correctionVan Niekerk, G.J. 05 September 2012 (has links)
M.Sc. / Layered Manufacturing (LM), also known as "Rapid Prototyping", is that process in terms of which a computer-designed model is created layer by layer with the aid of specific LM hardware. Telemanufacturing constitutes an extension of this technology that allows remote submission of manufacturing jobs or assignments across a communication medium, typically the Internet, to be built at the manufacturing bureau concerned. The de facto standard of LM is the STL file. Simply put, this file consists of a number of triangles that are used to describe an object in its entirety. This file format has several advantages over other known formats and allows easy 2D rendering. Unfortunately, however, the limitations of the latter format outweigh its advantages. Since the entire model is described in terms of a collection of triangles, the original geometry of the model is lost. As a result, a certain level of degradation will occur, especially around curvatures in the model. Although an increase in the number of triangles around such areas will enhance precision, it will also result in a much larger STL file. Triangles that get lost somewhere inside the file could also give rise to holes, orphaned surfaces and zero-width walls in the projected object. It is vital, therefore, that the manufacturing bureau verify the correctness of the entire file before it is built in order to prevent machine time and materials from being wasted. Instead of transmitting the entire file again, the bureau could attempt automatically to correct and repair less critical errors, thereby saving valuable resources and time.
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An implementation framework for knowledge-based engineering projectsMvudi, Yannick 27 May 2013 (has links)
M.Ing. (Engineering Management) / The growing need for customized solutions and faster product delivery obliges the product development industry to develop new strategies that can enable the rapid and flexible design of products. Several design approaches have been developed to address this issue: one such is Knowledge-Based Engineering (KBE), which is a design technique that enables the automation of the design process. This approach consists of using computational intelligence to capture the design rules related to a product family in order to generate automatically customized designs adapted to particular customer requirements. Knowledge-Based Engineering is also used to facilitate the performance of design evaluation activities such as finite element analysis (FEA) and computational fluid dynamics (CFD) as part of multi-disciplinary design optimization (MDO). The application of this approach led to impressive results mostly in the automotive and aeronautical industry. Owing to this method, some companies manage to reduce the duration of the design process by 90%. Despite the excellent results obtained through the use of Knowledge-Based Engineering, there are still very few companies that make use of this approach in their design process. The review of the relevant literature showed that the lack of a standard easy-to-use methodology of implementation is one of the major obstacles to the expansion of Knowledge-Based Engineering. The knowledge processing phase constitutes one of the main challenges of the KBE implementation process. This phase consists of extracting and documenting the knowledge embedded in the design team in order to convert it in a programming code. Available methodologies such as MOKA and KNOMAD do not seem to provide easy-to-use methods to represent the design knowledge in a form that makes it easy to be programmed. The lack of a preliminary stage that justifies the adequacy of KBE for a particular design process is also an important gap identified in the literature.This dissertation discusses a detailed method that addresses issues related to knowledge processing and suitability analysis in KBE implementation. The knowledge processing method suggested is based on the Work Breakdown Structure (WBS) which is used widely in the system engineering approach and consists of a very logical classification of the design knowledge. The strength of this method lies in its ability to represent the design knowledge in a form that makes it understandable for both engineers and programmers. Appropriate representation of this sort shortens the duration of the knowledge processing and facilitates the knowledge programming phase. Regarding the rationale for choosing of KBE, a detailed suitability assessment method is proposed.
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Komplexní využití konstrukčních podkladů pro CNC programování turbínových skříní. / Total usage of design dates for CNC programming of turbine casingMatejková, Monika January 2010 (has links)
This thesis aims at designing a solution to the comprehensive use of construction underlying documents for the CNC programming of turbine casings. The introductory part of the thesis contains a description of the CNC programming and CAD/CAM systems. The following is mapping of the current state of the construction underlying documents, and mapping of the situation in the department of technology in Siemens Industrial Turbomachinery, s.r.o., Brno. The further section presents an analysis of the problem that arose when processing and sharing the construction underlying documents with the aim of streamlining the CNC programming process. The closing part presents the evaluation and conclusions for implementation of the proposed solutions.
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