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Tesis sobre el tema "Computer-aided engineering"
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Akbary-Safa, Mahnaz. "Computer aided inspection in engineering manufacture." Thesis, Imperial College London, 1992. http://hdl.handle.net/10044/1/8346.
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Sivaloganathan, Sangarappillai. "Sketching input for computer aided engineering." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292733.
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Shahdad, Mir Abubakr. "Engineering innovation (TRIZ based computer aided innovation)." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3317.
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This thesis describes the approach and results of the research to create a TRIZ based computer aided innovation tools (AEGIS and Design for Wow). This research has mainly been based around two tools created under this research: called AEGIS (Accelerated Evolutionary Graphics Interface System), and Design for Wow. Both of these tools are discussed in this thesis in detail, along with the test data, design methodology, test cases, and research. Design for Wow (http://www.designforwow.com) is an attempt to summarize the successful inventions/ designs from all over the world on a web portal which has multiple capabilities. These designs/innovations are then linked to the TRIZ Principles in order to determine whether innovative aspects of these successful innovations are fully covered by the forty TRIZ principles. In Design for Wow, a framework is created which is implemented through a review tool. The Design for Wow website includes this tool which has been used by researcher and the users of the site and reviewers to analyse the uploaded data in terms of strength of TRIZ Principles linked to them. AEGIS (Accelerated Evolutionary Graphics Interface System) is a software tool developed under this research aimed to help the graphic designers to make innovative graphic designs. Again it uses the forty TRIZ Principles as a set of guiding rules in the software. AEGIS creates graphic design prototypes according to the user input and uses TRIZ Principles framework as a guide to generate innovative graphic design samples. The AEGIS tool created is based on TRIZ Principles discussed in Chapter 3 (a subset of them). In AEGIS, the TRIZ Principles are used to create innovative graphic design effects. The literature review on innovative graphic design (in chapter 3) has been analysed for links with TRIZ Principles and then the DNA of AEGIS has been built on the basis of this study. Results from various surveys/ questionnaires indicated were used to collect the innovative graphic design samples and then TRIZ was mapped to it (see section 3.2). The TRIZ effects were mapped to the basic graphic design elements and the anatomy of the graphic design letters was studied to analyse the TRIZ effects in the collected samples. This study was used to build the TRIZ based AEGIS tool. Hence, AEGIS tool applies the innovative effects using TRIZ to basic graphic design elements (as described in section 3.3). the working of AEGIS is designed based on Genetic Algorithms coded specifically to implement TRIZ Principles specialized for Graphic Design, chapter 4 discusses the process followed to apply TRIZ Principles to graphic design and coding them using Genetic Algorithms, hence resulting in AEGIS tool. Similarly, in Design for Wow, the content uploaded has been analysed for its link with TRIZ Principles (see section 3.1 for TRIZ Principles). The tool created in Design for Wow is based on the framework of analysing the TRIZ links in the uploaded content. The ‘Wow’ concept discussed in the section 5.1 and 5.2 is the basis of the concept of Design for Wow website, whereby the users upload the content they classify as ‘Wow’. This content then is further analysed for the ‘Wow factor’ and then mapped to TRIZ Principles as TRIZ tagging methodology is framed (section 5.5). From the results of the research, it appears that the TRIZ Principles are a comprehensive set of innovation basic building blocks. Some surveys suggest that amongst other tools, TRIZ Principles were the first choice and used most .They have thus the potential of being used in other innovation domains, to help in their analysis, understanding and potential development.
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CAMPANELLA, Davide. "COMPUTER AIDED ENGINEERING OF SOLID BONDING PHENOMENA." Doctoral thesis, Università degli Studi di Palermo, 2014. http://hdl.handle.net/10447/95507.
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Joining is a fundamental technological process in manufacturing used to
create a single piece from two or more parts. Welding is still today one of the
most popular joining techniques used in manufacturing allowing a permanent
junction. Traditional welding processes are based on the melting of the materials
to be joined. In this way, several defects may arise because of solidification
problems, joints deformation due to elevated residual stress and metallurgical
integrity of the joints (intermetallic, porosities, etc). As an example, some
aluminum alloys present considerable problems the junction is carried out by
traditional fusion welding methods. During the melting process, in fact, the liquid
material can react with the surrounding atmosphere oxidizing and creating a weak
joint.
On the other hand, Solid Bonding based welding processes allow for
defect free joints with low residual stress and low distortion. However, these
processes are usually characterized by complex mechanics due to peculiar
material flow. Hence, the engineering and optimization of solid bonding
processes is difficult and requires a large number of time and cost consuming
test trials. In this way, proper numerical models are essential tools permitting
effective process design.
The aim of this research was the computer aided engineering of two
different manufacturing processes taking advantage of the same metallurgical
phenomenon, namely solid boding. Linear Friction Welding (LFW), used to weld
non-axisymmetric components and Accumulative Roll Bonding (ARB), used to
increase the mechanical properties of sheet metals, were selected. Experiments,
both of LFW and ARB, were run with the aim to study the effects of the process
input parameters on the final product quality, to define proper process windows
and to acquire the data needed for the numerical models set up and validation.
In particular, as far as LFW is regarded, a dedicated experimental machine, able
to produce LFWed joints with varying pressure, oscillation frequency and
amplitude, was designed and built.
Numerical models were set up, validated and used to design the process
by studying the complex material behavior during the solid bonding of different
aluminum alloys. In particular, as far as ARB is regarded, two different numerical models were considered, using an explicit and implicit approach, respectively, in
order to study the process. An implicit approach was used for the LFW process,
leading to the understanding of the main process variables influence on the field
variables distribution and the occurrence of actual bonding. The simulation tools
used in this work were DEFORM3D and ABAQUS CAE/6.9 (2D and 3D modes).
The first prototype of the LFW machine was designed and developed during the
first doctorate year. During the second doctorate year, the Accumulative Roll
Bonding process was studied at the University of Erlangen-Nuremberg while,
during the third year, the Linear Friction Welding process was analyzed at the
University of Palermo.
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Song, Guangming. "An application of computer aided design and computer aided draughting techniques to gearing." Thesis, City, University of London, 1988. http://openaccess.city.ac.uk/19505/.
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The thesis describes the development of a computer-aided design and computer-aided draughting package of industrial gearboxes for transmitting power between shafts having parallel major axes. The package mainly consists of the following functions: (a) Determination of gear tooth numbers from the properties of continued and conjugate fractions (b) Generation of gear teeth by a rack-type cutter (c) Calculation of gear tooth profile and production of gear tooth grid for finite element stress analysis (d) Detailed strength analysis and design of a spur or helical, external or internal, standard or modified, single- or double- reduction gear set based on the ISO gear standards (e) Shaft design and analysis (f) Bearing selection and analysis (g) Production of the working drawings of the main gearbox components. This package works on the IBM PC and its compatible machines, operates in an interactive mode, combines the experience of the designer with the power of the computer, and produces substantial savings in time and cost over conventional design methods. Design examples illustrating this package are given. In addition, the maximum tooth root bending stresses have been studied by using finite element techniques and the results have been compared with those using the ISO gear standards.
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Le, Gal Thierry. "Re-engineering software for integration using computer aided software engineering." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06232009-063016/.
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Panton, Stephen M. "Computer aided form roll design." Thesis, Aston University, 1987. http://publications.aston.ac.uk/11928/.
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Cold roll forming is an extremely important but little studied sheet metal forming process. In this thesis, the process of cold roll forming is introduced and it is seen that form roll design is central to the cold roll forming process. The conventional design and manufacture of form rolls is discussed and it is observed that surrounding the design process are a number of activities which although peripheral are time consuming and a possible source of error. A CAD/CAM system is described which alleviates many of the problems traditional to form roll design. New techniques for the calculation of strip length and controlling the means of forming bends are detailed. The CAD/CAM system's advantages and limitations are discussed and, whilst the system has numerous significant advantages, its principal limitation can be said to be the need to manufacture form rolls and test them on a mill before a design can be stated satisfactory. A survey of the previous theoretical and experimental analysis of cold roll forming is presented and is found to be limited. By considering the previous work, a method of numerical analysis of the cold roll forming process is proposed based on a minimum energy approach. Parallel to the numerical analysis, a comprehensive range of software has been developed to enhance the designer's visualisation of the effects of his form roll design. A complementary approach to the analysis of form roll design is the generation of form roll design, a method for the partial generation of designs is described. It is suggested that the two approaches should continue in parallel and that the limitation of each approach is knowledge of the cold roll forming process. Hence, an initial experimental investigation of the rolling of channel sections is described. Finally, areas of potential future work are discussed.
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Cevheri, Necmettin. "Computer Aided Engineering Of An Unmanned Underwater Vehicle." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610754/index.pdf.
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Hydrodynamic and thermal analyses performed during the conceptual design of an
unmanned underwater vehicle are presented in this study. The hull shape is
determined by considering alternative shapes and the dimensions are determined
from the internal arrangement of components. Preliminary thermal analyses of the
watertight section are performed with a commercial software called FLUENT to
check the risk of over-heating due to the heat dissipation of devices.
Performance of the proposed hull design is analyzed by FLUENT. Before
simulations of the vehicle, validation studies are performed. Models 4159, 4158 and
4154 of Series 58 are chosen as the experimental reference. Their total resistance
coefficients are compared with the results of the validations analyses. Mesh densities,
turbulence models, near wall modeling approaches and inlet turbulence intensities
are varied to understand their effects on the accuracy of predictions. A suitable
turbulence modeling approach is chosen to analyze forward and vertical motions of
the vehicle to check whether speed requirements are fulfilled. Hull configurations
with and without appendages are used to observe their effects on total drag. It is
observed that the proposed design satisfies speed requirements of the vehicle and no
overheating is expected in the watertight section.
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Zullo, Luca Costantino. "Computer aided design of experiments : an engineering approach." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/8323.
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Oltikar, Akhil Manohar. "Computer-Aided Engineering of Plywood Upholstered Furniture Frames." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20001221-130641.
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<p>Until the early 1900s, furniture was built by hand, one piece at a time. The industrial revolution and modern manufacturing technology has changed all of that. Today, as the furniture industry moves firmly into the next century, computerized systems and automated manufacturing have become more common to the industry. This thesis represents an effort to analyze the current practices in computer-aided design of upholstered furniture, specifically plywood frame furniture, and to develop new procedures for reducing the lead-time in upholstery product development. Different 3-D modeling techniques for designing plywood furniture frames and their features have been developed and implemented. A plywood frame feature library has been created, and geometric relations needed to fully constrain each feature type have been developed. This reduces modeling time and also increases consistency in the solid models. A new reverse engineering procedure, using an articulating arm, has been proposed, implemented, and tested for 3-D digitization of plywood frames. The proposed methodology eliminates some of the traditional processes currently followed in the industry, thus making the product development faster and more streamlined. Further, an algorithm has been developed, implemented and tested for automatically mirroring plywood upholstery frame assemblies in a CAD system. The algorithm considerably reduces the modeling lead-time in the product development process. Finally, some future work that considers currently available 3-D CAD technologies has been recommended which would help close the gap between upholstery designers and manufacturers.<P>
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Altenhof, Jeffrey L. "Computer-aided concurrent engineering in refrigeration system design." Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020010/.
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Hatchell, Brian. "Data base design for integrated computer-aided engineering." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/16744.
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Gabbay, Lynn Daniel. "Computer aided macromodeling for MEMS." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9955.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.<br>Includes bibliographical references (p. 85-87).<br>by Lynn Daniel Gabbay.<br>Ph.D.
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Ong, Chee Fatt. "Computer-aided design of tension structures." Thesis, City University London, 1992. http://openaccess.city.ac.uk/7994/.
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This thesis consists of three parts. Part I (chapters 1-4) gives a review and description of the basis for the numerical modelling of tension structures. The discussion in Part I leads to the conclusion of a need for an interactive design procedure for tension structures which is the subject under consideration in Part II (chapters 5-7). In the design of tension structures, an area which requires special attention is the dynamic response often initiated by the action of a natural wind. In Part III (chapters 8 and 9), this area is examined in detail and a strategy is proposed to give an improved modelling of dynamic response. The numerical procedure developed is assessed by comparison with previously reported test results for a pneumatic dome. Chapter 1 gives a general introduction to tension structures, and their main characteristics and behaviour are briefly described. From both the structural and architectural points of view, tension structures (classified as either prestressed cable nets or doubly curved membranes) do offer a number of benefits which arise from their characteristics and behaviour. The different types of cable nets which can be contructed are outlined, and various possible types of membrane structures and membrane materials which can be used are described. In addition, the form-finding and load analysis stages in the design process of tension structures are briefly discussed. An overview of Parts I, II and III of this thesis is also included. As a result of the flexible nature of a tension structure, large deformations often occur under loads acting normal to the surface. In addition, the coated woven fabrics exhibit material non-linearities, ie. the material properties vary under loads. In other words, a full non-linear structural analysis accounting for both material and geometric non-linearities is required in order to give a realistic modelling of the behaviour of a tension structure. Chapter 2 reviews numerical methods which have been widely reported for dealing with nonlinear structural analysis. From the review, it will be noted that the dynamic relaxation (DR) method is well suited to solving the highly non-linear problems which occur particularly in the case of tension structures. The dynamic relaxation method with a finite element idealisation of the structure is chosen as the solution scheme for all the analysis work in this thesis, and a detailed description of the method is given in chapter 3. Features of the method which are particularly useful for the design of tension structures are: (a) the effective decoupling of the equations of compatibility and equilibrium which allows complex material properties modelling and the use of slip cables, etc., and (b) the use of a 'kinetic' damping procedure which permits gross changes in support geometries to be made during interactive form-finding without the possibility of numerical instability. Although the main surface spanning elements may be purely tensile, many tension structures will employ compression and bending elements for their support. For example, as a means of providing support to a large span tension structure, a compression boundary is considered to be an efficient alternative to tension anchorages. In a sense, a compression boundary is complimentary to the tension elements in the structure as these elements also act as supports to the compression boundary. This gives the advantage of a compression boundary comprising of slender sections. The compression boundary is modelled as a series of beam elements. The moment-curvature equations of a beam element expressed in the form of natural stiffness relations, are developed in chapter 4. In addition, the non-linearities, both geometric and material, and boundary conditions which can be dealt with by the beam elements are considered. An outline is given of the implementation of the beam elements using the dynamic relaxation method. Included in chapter 4 are also the results to test problems which have been set up in order to validate the underlying theory and implementation of the beam elements. As tension structures often exhibit complex surface curvatures, a study of surfaces, their properties and behaviour is appropriate, and useful in the understanding of concepts applied in the design process. This study is the subject of chapter 5 which focusses on the relevant topics of differential geometry. A few useful ideas from differential geometry form the basis of certain procedures implemented into the form-finding and patterning stages being considered in chapter 6. The derivation of the equilibrium equations for a surface when acted on by applied loads is also given in chapter 5. The discussion in chapter 6 is about the stages of form-finding and static load analysis in the design process. A review of the available solution methods for the form-finding problem are given in this chapter. In these methods, the solution can be for either the unknown geometry or unknown stresses, or both. The adopted approach in this thesis is to solve for the unknown equilibrium geometry given the stress distributions, and initial and boundary conditions. The controls which can be used during form-finding to achieve the desired geometries of cable nets and membrane structures are discussed. The equilibrium geometry derived from the form-finding stage has to be subsequently evaluated for its performance under loads at the load analysis stage. After an equilibrium geometry which behaves satisfactorily under loads has been achieved, the corresponding cutting patterns are developed in the case of membrane structures. Recent advances in interactive computer graphics technology have made it possible to develop a fully interactive CAD system for tension structures. The development of such a CAD system is the subject of discussion in chapter 7. The CAD system integrates together the form-finding, load analysis and fabrication patterning stages, resulting in a continuous design process. It demonstrates how the various concepts discussed in Part I of this thesis fit together within an interactive environment implemented with an effective and functional user interface. It is illustrated in chapter 7 how such a user interface has been achieved. The CAD system fully exploits the capabilities offered by the available computer hardware such that the computations involved during analysis of the structure, in generation of surface shaded graphic images and so on, can be executed at very high speeds. As a result, the CAD system can respond quickly to the user and is thus consistent with the interactive nature of the design process. The discussion in chapter 7 also provides an insight into the various procedures involved throughout the design process. The CAD system has produced a number of benefits of which the main one is the saving in design time which has been achieved. As the CAD system is highly user friendly, only a short learning period is required, thus enabling it to be used more widely among designers. The CAD system also serves as a useful tool for the communication of ideas between the engineer and the architect. In the design of a tension structure unlike that of a conventional building, there is often close cooperation between the engineer and the architect right from the early stages of conceptual development. In chapter 8, the possible loads which may act on a tension structure during its service life are considered. These loads are applied to the structure at the load analysis stage in the design process. In most cases, the design loads are those due to snow and wind. An accurate assessment of the loads is essential in order to achieve a structurally sound and economic design. In addition, it should be possible to represent the loads in a form which can be easily applied in the structural analysis. The considerations which are involved in the assessments of the snow and wind loads are outlined.
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Patil, Dilip Madhusudan. "Feature based computer aided process planning." Thesis, University of Warwick, 1995. http://wrap.warwick.ac.uk/110865/.
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This research attempts to study, plan and develop an integrated feature based CAPP system that generates automated process plans for machining prismatic components. The CAPP system comprises a STEP compliant feature based commercial CAD system and the Smalltalk object oriented system. A library of features has been developed that is based on STEP based form feature taxonomy but modified to communicate the manufacturing intent and feature aggregation. The CAPP system has been developed to represent the product, process and resource domain knowledge with a number of object hierarchies, communication methods, and the user interface that would suit the concurrent engineering needs. In addition, suitable geometric and process reasoning methods have been developed in the CAPP system that use the feature based component design data to generate automated process plans. The research also attempts to identify the problems in feature based process planning and discusses the possible solutions. A solution to the side feature interaction problem has been implemented in the CAPP system. The CAPP system test results have demonstrated that the proposed approach has been successful and has a great potential for further improvements in terms of flexibility, modularity, emerging data exchange standards, and case in customising the CAPP system.
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Varma, Ambrish Kant. "COMPUTER AIDED TOOLSFORSEAMLESS HIGH DENSITY INTERCONNECTS." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010410-171850.
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<p><B>Varma, Ambrish Kant. Computer - Aided Tools for Seamless High DensityInterconnects. (Under the direction of Paul D. Franzon)</B><BR>This thesis presents the tool-set designed to demonstrate the possibility of using theCadence tools to design, verify and extract circuitry on the substrate along with theon-chip design. This circuitry could be an inter-chip connection that connects twodifferent chips or an intra-chip connection where a long interconnect is taken off fromthe active area of the chip to the substrate and back on to the same chip.<BR>To be able to do this task, the work for this project is broadly classified into fourdifferent categories. These are writing<BR> The technology file and the display.drf file The Design Rule Check deck The Layout Verses Schematic deckAfter having completed the above-mentioned tasks, the tool-set was also tested andimplemented on a circuit.<P>
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Kyratzoglou, I. M. (Ioannis M. ). "Computer aided design for Petri Nets." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14669.
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Mavrovouniotis, Michael L. (Michael Loizos). "Computer-aided design of biochemical pathways." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14449.
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Tanga, Rajan M. "Computer aided software engineering tool for generating C code." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182872759.
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Varsamidis, Thomas. "Object-oriented information modelling for computer-aided control engineering." Thesis, Bangor University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245177.
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Hoyer, Markus. "Catalogue based computer aided engineering (CAE) of process models." Thesis, University of South Wales, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441212.
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Chow, Yi-Mei Maria 1974. "Computer-aided engineering methodology for structural optimization and control." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/80921.
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Pensulo, Emilius M. "Integrating computer aided engineering functions: the management of information." Thesis, Aston University, 1987. http://publications.aston.ac.uk/11853/.
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Ilango, Sankaralingam. "Computer-aided underground mining machine sequencing." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183047349.
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Kitano, Akira. "A prototype computer-aided assembly planning system." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14059.
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Critz, David Karl. "Computer aided fatigue life prediction for polymers." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10489.
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Rosen, Jacob (Jacob Benjamin). "Computer aided tax avoidance policy analysis." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98541.
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Thesis: S.M. in Technology and Policy, Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2015.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Title as it appears in MIT Commencement Exercises program, June 5, 2015: Computer aided tax evasion policy analysis: partnership calculation. Includes bibliographical references (pages 81-83).<br>his thesis presents a three part methodology for analyzing the ow of taxable income in large partnership structures. The method forms the basis for prototypical software which would clarify many complicated basis adjustment issues associated with partnership taxation. Partnerships, the most common form of "flow-through" tax entities, have rapidly increased in size, complexity and economic relevance between 2005 to 2015, as well as resulting in an estimated $91 billion in underreported income. Many of these partnerships have upwards of one million direct and indirect partners, as well as 100 tiers of additional large partnerships. This surge in the number of partnerships, combined with the highly complicated nature of US partnership taxation law, requires novel techniques to evaluate the tax consequences of increasingly complex financial activity. A computational methodology is presented in this thesis for understanding and analyzing the allocation of taxable income in large partnership structures, with particular focus on characterizing abusive tax behavior. First, a formal notation is established to fully describe how taxable income is allocated in partnerships, forming the basis of a functioning partnership tax calculator. Next, a simulation is described that processes transaction sequences through partnership structures, as well as a method for assigning audit likelihood to potentially suspicious combinations of financial activity. Finally, a means by which to optimize a) transaction sequences that minimize both tax liability and audit likelihood and b) auditing procedures that characterize abusive tax behavior in a compact form is established. The proposed methodology offers taxpayers, auditors and policy-makers a computational approach to resolve uncertainty in partnership taxation, lower the cost of the auditing process through automation and provide a conceptual exploration of tax policy implications.<br>by Jacob Rosen.<br>S.M. in Technology and Policy
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Irwin, Dennis M. "Re-engineering of the computer-aided prototyping system for portability." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA322566.
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Thesis (M.S. in Computer Science) Naval Postgraduate School, September 1996.<br>"September 1996." Thesis advisor(s): Luqi and Valdis Berzins. Includes bibliographical references (p. 35-37). Also Available online.
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Yetkin, Recep Erdinc Enriquez Sotero. "Re-engineering portabililty of the Computer Aided Prototyping System (CAPS) /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333411.
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Bérard, Adrien. "Method Development for Computer Aided Engineering for Aircraft Conceptual Design." Licentiate thesis, KTH, Aeronautical and Vehicle Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9240.
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<p>This thesis presents the work done to implement new computational tools and methods dedicated to aircraft conceptual design sizing and optimization. These tools have been exercised on different aircraft concepts in order to validate them and assess their relevance and applicability to practical cases.First, a geometry construction protocol has been developed. It is indeed essential to have a geometry description that supports the derivation of all discretizations and idealizations used by the different analysis modules (aerodynamics, weights and balance, stability and control, etc.) for which an aircraft concept is evaluated. The geometry should also be intuitive to the user, general enough to describe a wide array of morphologies and suitable for optimization. All these conditions are fulfilled by an appropriate parameterization of the geometry. In addition, a tool named CADac (Computer Aided Design aircraft) has been created in order to produce automatically a closed and consistent CAD solid model of the designs under study. The produced CAD model is easily meshable and therefore high-fidelity Computational Fluid Dynamics (CFD) computations can be performed effortlessly without need for tedious and time-consuming post-CAD geometry repair.Second, an unsteady vortex-lattice method based on TORNADO has been implemented in order to enlarge to scope of flight conditions that can be analyzed. It has been validated satisfactorily for the sudden acceleration of a flat plate as well as for the static and dynamic derivatives of the Saab 105/SK 60.Finally, a methodology has been developed to compute quickly in a semi-empirical way the buffet envelope of new aircraft geometries at the conceptual stage. The parameters that demonstrate functional sensitivity to buffet onset have been identified and their relative effect quantified. The method uses a combination of simple sweep theory and fractional change theory as well as the buffet onset of a seed aircraft or a provided generic buffet onset to estimate the buffet envelope of any target geometry. The method proves to be flexible and robust enough to predict within mainly 5% (and in any case 9%) the buffet onset for a wide variety of aircrafts, from regional turboprop to long-haul wide body or high-speed business jets.This work was done within the 6<sup>th</sup> European framework project SimSAC (Simulating Stability And Control) whose task is to create a multidisciplinary simulation environment named CEASIOM (Computerized Environment for Aircraft Synthesis and Integrated Optimization Methods), oriented toward stability and control and specially suited for aircraft conceptual design sizing and optimization.</p><br>SimSAC
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Ladner, Amy Lynn. "FREE-FORM DEFORMATION FOR COMPUTER-AIDED ENGINEERING ANALYSIS AND DESIGN." MSSTATE, 2007. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07022007-131403/.
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Toward support of the use of geometry in advanced simulation, a free-form deformation (FFD) tool was designed, developed, and tested using object oriented (OO) techniques. The motivation for creating this FFD tool in-house was to provide engineers and researchers a cost efficient, quick, and easy way to computationally manipulate models without having to start from scratch while readily seeing the resulting geometry. The FFD tool was built using the OO scripting language, Python, the OO GUI toolkit, Qt, and the graphics toolkit, OpenGL. The tool produced robust and intuitive results for two-dimensional shapes especially when multiple point manipulation was utilized. The use of ?grouping? control points also provided the user the ability to maintain certain desired shape features such as straight lines and corners. This in-house FFD tool could be useful to engineers due to the ability to customize source code.
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Yetkin, Recep Erdinc, and Sotero Enriquez. "Re-engineering portabililty of the Computer Aided Prototyping System (CAPS)." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8897.
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Approved for public release; distribution is unlimited<br>The Computer-Aided Prototyping System (CAPS) currently runs only on SPARC workstations ruling SunOS version 4.1.3. This limits the usefulness of CAPS, since Sun Microsystems has publicly announced that they have no interest in continuing support for SunOS version 4.x. A solution to this problem is to port CAPS to a PC platform running the Linux operating system. Towards this end, the graphical editor portion of CAPS was ported onto a 100Mhz Pentium, with 32 MB of RAM, Linux 3.0, running Motif 2.0 on X windows. Modifications to both, the Makefile and the graphical editor source code were required for a successful compilation. These modifications were items such as having to compile using various compilers, providing pointers to the Motif and X windows Libraries needed to produce the static builds of the graphical editor, and a number of recompilations of the Linux kernel. As a result of these efforts, the graphical editor, a functional component of CAPS, was successfully ported to this system. The software database, project control and execution support components still remain to be ported as a future development
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Manley, Gary W. "The classification and evaluation of Computer-Aided Software Engineering tools." Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/34910.
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Approved for public release; distribution unlimited.<br>The use of Computer-Aided Software Engineering (CASE) tools has been viewed as a remedy for the software development crisis by achieving improved productivity and system quality via the automation of all or part of the software engineering process. The proliferation and tremendous variety of tools available have stretched the understanding of experienced practitioners and has had a profound impact on the software engineering process itself. To understand what a tool does and compare it to similar tools is a formidable task given the existing diversity of functionality. This thesis investigates what tools are available, proposes a general classification scheme to assist those investigating tools to decide where a tool falls within the software engineering process and identifies a tool's capabilities and limitations. This thesis also provides guidance for the evaluation of a tool and evaluates three commercially available tools.
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Virk, Gurmej Singh. "A computer-aided learning and design system for control engineering." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364270.
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Gavin, Carl Jospeh. "The application of Computer-Aided Software Engineering within manufacturing industry." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241486.
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Blake, Etoile Saint-Melson. "Computer aided techniques for the reliability assessment of engineering systems." Thesis, London South Bank University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279708.
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Potgieter, L. "Circuit tutor : a computer-aided learning package for electrical engineering." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/23322.
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The development of Circuit Tutor, the subject of this dissertation, resulted from a conviction that computers can further enrich the Electronic Engineering curriculum. After an investigation into the different roles of the computer in education the use of modelling and simulation was selected as an effective Computer Aided Learning method. It was realised that the development of any non-trivial simulation program is however not an easy task. The programmer must not only model the circuit behaviour, but also write the man-machine interface (MMI). The main goal of Circuit Tutor was to provide a ready-made simulation environment which makes effective use of the graphics capabilities of the microcomputer for the simulation of a whole class of electrical circuit simulations. To facilitate rapid prototyping the installer is provided with: (1) a man-machine interface which provides the user with a graph, 3 meters, a circuit diagram of the circuit, a menu facility, windows to view circuit parameters and outputs: (2) a program scheduler; (3) a library of maths functions, including Gauss-Jordan elimination of complex matrices; and (4) Circuit Draw: a utility to draw a circuit diagram. Particular emphasis was placed on the design of the user's interface. It has been possible to restrict the effort to link in a new circuit model to 3 modifications to the man-machine interface (MMI) part of the program. Present software and MMI design were investigated. Circuit Tutor and Circuit Draw were developed using modular software design techniques. A modular design chart similar to that proposed by Wiener (1984) was found to be useful during the design stages of both Circuit Tutor and Circuit Draw. Available computer languages for the IBM PC were evaluated and Turbo Pascal selected, as it offered most of the features necessary for the implementation of a modern, modular software design. Four circuits were implemented to serve as examples. The documentation was structured in a manner appropriate to a software project: Part 1 gives an introduction to computers in education and provides the rationale for the use of simulation. A brief overview of Circuit Tutor and Circuit Draw is presented. Part 2 contains the User's Reference Manual for Circuit Tutor and the Circuit Draw Utility. Part 3 contains the Designer's Reference Manual for Circuit Tutor and the Circuit Draw Utility.
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Bérard, Adrien. "Method development for computer aided engineering for aircraft conceptual design /." Stockholm : School of Engineering Sciences, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9240.
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Mehta, Bhavin V. "Computer aided design of streamlined dies." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182867408.
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Kang, Yuezhuang. "Computer-aided fixture design verification." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0108102-163543.
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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: Fixture stiffness matrix; Jacobian matrix; kinetic model; geometric model; fixture design verification; stability analysis; tolerance analysis; tolerance assignment. Includes bibliographical references (p. 92-97).
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Magill, W. R. "A generative Computer Aided Process Planning system." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328585.
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Nakamura, Takatoshi. "A computer-aided system for space welding." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/38350.
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Chen, Weng-Jen. "Manufacturing information for engineering design." Thesis, University of Cambridge, 1998. https://www.repository.cam.ac.uk/handle/1810/272428.
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Amin, Nada. "Computer-aided design for multilayer microfluidic chips." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53122.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.<br>Includes bibliographical references (leaves 63-66).<br>Microfluidic chips fabricated by multilayer soft lithography are emerging as "lab-on-a-chip" systems that can automate biological experiments. As we are able to build more complex microfluidic chips with thousands of components, it becomes possible to build devices which can be programmatically changed to solve multiple problems. However, the current design methodology does not scale. In this thesis, we introduce design automation techniques to multilayer soft lithography microfluidics. Our work focuses on automating the design of the control layer. We present a method to define an Instruction Set Architecture as a hierarchical composition of flows. From this specification, we automatically infer and generate the logic and signals to control the chip. To complete the design automation of the control layer, we suggest a routing algorithm to connect control channels to peripheral I/O ports. To the microfluidic community, we offer a free computer-aided design tool, Micado, which implements our ideas for automation in a practical plug-in to AutoCAD. We have evaluated our work on real chips and our tool has been used successfully by microfluidic designers.<br>by Nada Amin.<br>M.Eng.
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Heng, Fock Lee. "Computer-aided analysis and design for extrusion dies." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5444.
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Lord, Patrick Jean. "Computer aided intertrochanteric osteotomy planning and surgery simulation." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/33814.
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Chen, Jie Ph D. Massachusetts Institute of Technology. "Computer-aided rational solvent selection for pharmaceutical crystallization." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59874.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 131-135).<br>Solvents play an important role in crystallization, a commonly used separation and purification technique in the pharmaceutical, chemical and food industries. They affect crystal properties such as particle size distribution, morphology, polymorphism etc. and therefore have consequences for the downstream processing of the solid material. Current solvent selection techniques for solution crystallization remain ad hoc and typically do not have a theoretical underpinning. Elucidation of the interactions between solvent and solute molecules and the mechanism underlying the solvent effects on each aspect of the crystal properties would be a major aid for the rational selection of solvents and also the development of crystallization processes. In this work we studied the effect of solvent on the polymorphism and morphology of organic crystals using molecular modeling techniques. The two most important contributions of this thesis are listed below. 1. We studied the self-assembly of solute molecules in solutions prior to nucleation for two polymorphic systems, tetrolic acid and glycine, using molecular dynamics simulations. We tested the existence of a link between the structure of the clusters formed in solution and the polymorphism of the crystals. Our results show that the link hypothesis succeeds in explaining the polymorph selection of tetrolic acid from different solvents. However it fails for glycine and thus should be used with caution. 2. We designed a computer-aided rational solvent selection procedure for improving the morphology of needle-like 2,6-dihydroxybenzoic acid form 2 crystal. We also experimentally grew 2,6-dihydroxybenzoic acid form 2 crystals using the solvent mixture suggested by computer simulations, which do exhibit reduced aspect ratios. This computer-aided selection procedure can not only quickly identify an effective solvent or solvent mixture, but also provide mechanistic understandings of the underlying chemistry. It can also be extended to improve the morphology of other needle-like organic crystals easily.<br>by Jie Chen.<br>Ph.D.
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Perez, Jose L. (Jose Luiz). "Computer-aided thermodynamics modeling of a pure substance." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35036.
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Davies, Daniel. "Representation of multiple engineering viewpoints in Computer Aided Design through computer-interpretable descriptive markup." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488893.
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The aim of this work was to find a way of representing multiple interpretations of a product design with the same CAD model and in a way that allowed reduction of the manual work of producing the viewpoint specific models of the product through automation The approach presented is the recording of multiple viewpoint-interpretations of a product design with a CAD product model using descriptive, by-reference (stand-off) computer interpretable markup of the model.
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Coxon, Andrew. "Computer aided analysis of paraspinal electromyography." Thesis, Teesside University, 2013. http://hdl.handle.net/10149/301616.
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Back pain is responsible for British employees taking 5 million sick days per year. Low back pain (LBP) has a controversial aetiology, with 95% of cases caused by mechanical, non-pathological causes. Current medical treatment for mechanical LBP is an exercise regime designed to restore lumbar stability. Unfortunately this is often a painful process, and therefore difficult to complete. Electromyography (EMG) variables have been shown to be able to discriminate between subjects with and without mechanical LBP. If these variables could be shown to have discriminatory abilities before the actual onset of LBP they could be used to predict future episodes of LBP in currently otherwise asymptomatic individuals and allow the rehabilitation process to begin before the onset of symptoms. However a number of problems persist with EMG measurement. The test must be administered under closely controlled conditions in order to record clean signals, and interpretation of this data requires special tools and training. This thesis aims to make contributions in three main areas; Automated Analysis: Manual analysis of a large store of EMG raw data files is a time consuming process. If outcome variables that require manual interpretation are included this effect is magnified, with necessary questions being raised as to the accuracy and consistency levels that can be maintained. A successfully implemented automated system would reduce analysis time and improve confidence in the outcome variables recorded. Investigations will also be carried out into the addition of error detection and correction algorithms that could be performed during the analysis procedure. ECG Contamination Removal: Previous studies have identified ECG as a potential source of contamination of lumbar EMG signals. Compensation for this effect is non-trivial as the ECG frequencies overlap an area of interest in the EMG spectrum, and the ECG signal characteristics would change over a fatiguing EMG test. The Independent Component Analysis method will be used to attempt to extract and remove the ECG component of a recorded signal whilst preserving the underlying EMG data. If this is successful an analysis of the effect that removing ECG contamination has on EMG outcome variables will be presented. Colour Map Diagnostic Method: Colour maps are an excellent method of presenting a large amount of signal data to a researcher, and have been used to discriminate between LBP and non-LBP subjects. The usefulness of this diagnostic display too has been somewhat limited however by the difficulty in producing such maps. Investigations will be carried out into methods that will be able to quickly and accurately produce these colour maps to the same specification as earlier studies. Colour maps of subjects that did not report LBP at the time of testing, but who then did report LBP at their next presentation, will be examined to assess whether or not EMG colour maps can be used as a predictor for low back pain.