Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"linearisation"”.
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Properties of the linearisation of the quadratic transformation of genetic algebras
In this thesis we study the linearisation of the quadratic transformation of commutative baric algebras due to Holgate (44), elaborated and applied by Abraham (1-5). Holgate studied the quadratic transformation 4-:A—* A, x<f>= x in special train algebras and showed that they possess a plenary …
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Linear Operation of Switch-Mode Outphasing Power Amplifiers
… is presented, and conventional techniques for linearisation are adapted for the particular needs of the outphasing power amplifier. More unconventional signal processing techniques are presented to aid linearisation of the outphasing power amplifier, both zero crossing and bandwidth expansion …
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Digital Pre-Distortion: The Implementation, Minimisation, & Estimation
… high efficiency and high linearity, an external linearisation technique can be applied to a PA. Digital Pre-Distortion (DPD) has been widely demonstrated in industry and academia to perform linearisation. Some issues concerning DPD are related to implementation efficiency, robust function …
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Advanced digital predistortion of power amplifiers for mobile and wireless communications
… theory of power amplifiers, overview of existing linearisation and memory-effects compensation techniques and reveals the current issues in the field. Further, the thesis depicts the proposed solutions to the problems, including the developed in-band distortion modelling technique, model …
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Robust control of nonlinear systems in the presence of uncertainties
… techniques are based. One category uses feedback linearisation, in which, besides a basic feedback linearisation controller proposed for the nominal part of the system, additional control effort is introduced to compensate the uncertainties in the system. The other category uses a variable …
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Frequency-domain modelling of floating wind turbines
… are linearised using both harmonic and tangent linearisation approaches; the harmonic linearisation gives improved results when stall occurs. The wake dynamics can also be included. The control system behaviour is linearised using the same method, which works well when the wind speed is far from …
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Ricci-flat deformations of orbifolds and asymptotically locally Euclidean manifolds
… we recover the relevant elliptic theory for the linearisation of the Ricci operator and the linearisation of the complex Monge-Ampère equation. We prove that integrability of infinitesimal deformations of the pair $(\bar{X},D)$ implies that ALE Ricci-flat deformations of ALE Ricci-flat Kähler …
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Vibro-acoustic dynamics in the presence of uncertainty and nonlinearity
… as part of the master system. A linearisation scheme for an ensemble of nonlinear systems under random loading has therefore been developed to establish a linearised Hybrid FE-SEA method. Although this motivated its development, the linearisation itself is completely general in …
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An integrated design strategy for a range of industrial electronic pressure instrumentation
… life of over 12 months, push button zeroing and linearisation, electromagnetic compliance with minimum design changes and an intrinsically safe power supply design that may be used not only in the instrument for which it was designed but for future instruments.<br/><br/>Individual design issues …
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Aerodynamic design and analysis of small horizontal axis wind turbine blades
… design and analysis of the blades. The linearisation for radial profiles of blade chord and twist angle for the FPFS wind turbine blade design was discussed. Results show that, the proposed linearisation approach leads to reduced manufacturing cost and higher annual energy production …
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Dynamics and control of flexible spacecraft : a case study
… governing equations of motion; and the Feedback Linearisation Technique (FLT) for the complete nonlinear set. The amount of information obtained through a planned parametric study of the system dynamics and control is indeed enormous. The results clearly show that under critical combinations of …
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Model Selection, Uniform Inference and Nonparametric Regression
… Under high-level assumptions, a non-asymptotic linearisation result delivers uniform rates of convergence for the series estimator. By verifying the high-level assumptions, case-specific rates can easily be derived. For example, the series estimator attains, up to a small logarithmic penalty, …
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Some applications of continuous variable neighbourhood search metaheuristic (mathematical modelling)
… methods on some problems may necessitate their linearisation. Several new ideas using heuristic approaches have been considered particularly since they tackle the problems within reasonable computational time and give an approximate solution. In this thesis, the variable neighbourhood search …
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Joint compensation of I/Q impairments and PA nonlinearity in mobile broadband wireless transmitters
… in this thesis shows promising results in the linearisation of wireless transmitters. Furthermore, the two-box model is extended for concurrent dual-band wireless transmitters and it takes into account cross-modulation (CM) products. Besides, it uses independent processing blocks for both …
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An investigation into the causes for the reduction in the variability of the El Niño-Southern Oscillation in the early Holocene in a global climate model
… mean state data, into the background states of a linearisation of the Zebiak and Cane model (Zebiak and Cane, 1987), due to Thompson and Battisti (2000). We show that when sets of background states are compiled using observations of the present climate that ENSO mode in the linearised model is …
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Single-crossover recombination and ancestral recombination trees
… a solvable system in a two-step procedure: first linearisation followed by diagonalisation. Even though the coefficients of the second step must be determined in a recursive manner, once this is done for a given system, they allow for an explicit solution of the system valid for all times. The …
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On the dynamics, stability and control of displaced lunar orbits
… of both solar sailing and SEP. Feedback linearisation is used to perform stabilisation and trajectory tracking for the nonlinear system. In addition to a detailed investigation of the dynamics and control of highly NKO, effort will be devoted to develop a strategy that uses maneuvres …
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Aspects of computational contact dynamics
… to the formalism of Contact Dynamics. Hybrid linearisation, parameter scaling and line search techniques are combined as the global convergence enhancements of the Newton algorithm. Quasi-static simulations of dry masonry assemblies exemplify performance of the presented framework.
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Deformations of Cayley submanifolds
… the operator of Dirac type that arises as the linearisation of the deformation map and show that for a generic choice of Spin(7)-structure, there are no obstructions, and hence the moduli space is a finite-dimensional smooth manifold whose dimension is equal to the index of the operator of …
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On the initial value problem in general relativity and wave propagation in black-hole spacetimes
… wave equation can be considered a “poor man’s” linearisation of the Einstein equations, these applications are of interest for a better understanding of the black hole stability conjecture, which states that the exterior of our explicit black hole solutions is stable to small perturbations, …
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