Enhancing numerical modelling efficiency for electromagnetic simulation of physical layer components.

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dc.contributor.author Sasse, Hugh Granville
dc.date.accessioned 2010-11-26T12:03:16Z
dc.date.available 2010-11-26T12:03:16Z
dc.date.issued 2010
dc.identifier.uri http://hdl.handle.net/2086/4406
dc.description.abstract The purpose of this thesis is to present solutions to overcome several key difficulties that limit the application of numerical modelling in communication cable design and analysis. In particular, specific limiting factors are that simulations are time consuming, and the process of comparison requires skill and is poorly defined and understood. When much of the process of design consists of optimisation of performance within a well defined domain, the use of artificial intelligence techniques may reduce or remove the need for human interaction in the design process. The automation of human processes allows round-the-clock operation at a faster throughput. Achieving a speedup would permit greater exploration of the possible designs, improving understanding of the domain. This thesis presents work that relates to three facets of the efficiency of numerical modelling: minimizing simulation execution time, controlling optimization processes and quantifying comparisons of results. These topics are of interest because simulation times for most problems of interest run into tens of hours. The design process for most systems being modelled may be considered an optimisation process in so far as the design is improved based upon a comparison of the test results with a specification. Development of software to automate this process permits the improvements to continue outside working hours, and produces decisions unaffected by the psychological state of a human operator. Improved performance of simulation tools would facilitate exploration of more variations on a design, which would improve understanding of the problem domain, promoting a virtuous circle of design. The minimization of execution time was achieved through the development of a Parallel TLM Solver which did not use specialized hardware or a dedicated network. Its design was novel because it was intended to operate on a network of heterogeneous machines in a manner which was fault tolerant, and included a means to reduce vulnerability of simulated data without encryption. Optimisation processes were controlled by genetic algorithms and particle swarm optimisation which were novel applications in communication cable design. The work extended the range of cable parameters, reducing conductor diameters for twisted pair cables, and reducing optical coverage of screens for a given shielding effectiveness. Work on the comparison of results introduced ―Colour maps‖ as a way of displaying three scalar variables over a two-dimensional surface, and comparisons were quantified by extending 1D Feature Selective Validation (FSV) to two dimensions, using an ellipse shaped filter, in such a way that it could be extended to higher dimensions. In so doing, some problems with FSV were detected, and suggestions for overcoming these presented: such as the special case of zero valued DC signals. A re-description of Feature Selective Validation, using Jacobians and tensors is proposed, in order to facilitate its implementation in higher dimensional spaces. en
dc.language.iso en en
dc.publisher De Montfort University en
dc.subject parallel TLM en
dc.subject transmission line matrix method en
dc.subject TLM en
dc.subject feature selective validation en
dc.subject FSV en
dc.subject optimization en
dc.subject genetic algorithms en
dc.subject particle swarm optimization en
dc.subject communication cable design en
dc.subject computational electromagnetics en
dc.subject CEM en
dc.subject validation en
dc.subject electromagnetics en
dc.subject electromagnetic compatibility en
dc.subject EMC en
dc.subject IEEE Standard 1597.1 en
dc.subject IEEE Standard 1597.2 en
dc.subject Ruby programming language en
dc.subject two dimensional feature selective validation en
dc.subject mathematical foundations of higher dimensional FSV en
dc.title Enhancing numerical modelling efficiency for electromagnetic simulation of physical layer components. en
dc.type Thesis or dissertation en
dc.publisher.department Faculty of Technology en
dc.publisher.department Department of Engineering en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD en

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