234 research outputs found
The analysis and design of multirate sampled-data feedback systems via a polynomial approach
This thesis describes the modelling, analysis and design of multirate sampled-data feed-back via the polynomial equations approach. The key theoretical contribution constitutes the embedding of the principles underpinning and algebra related to the switch and frequency decomposition procedures within a modern control framework, thereby warranting the use of available computer-aided control systems design software. A salient feature of the proposed approach consequently entails the designation of system models that possess dual time- and frequency-domain interpretations. Expositionally, the thesis initially addresses scalar systems excited by deterministic inputs, prior to introducing stochastic signals and culminates in an analysis of multivariable configurations. In all instances, overall system representations are formulated by amalgamating models of individual sub-systems. The polynomial system descriptions are shown subsequently to be compatible with the Linear Quadratic Gaussian and Generalised Predictive Control feedback system synthesis methods provide causality issues are dealt with appropriately. From a practical perspective, the polynomial equations approach proffers an alternative methodology to the state-variable techniques customarily utilised in this context and affords the insights and intuitive appeal associated with the use of transfer function models. Numerical examples are provided throughout the thesis to illustrate theoretical developments
Interpolatory Methods for Generic BizJet Gust Load Alleviation Function
The paper's main contribution concerns the use of interpolatory methods to
solve end to end industrial control problems involving complex linear dynamical
systems. More in details, contributions show how the rational data and function
interpolation framework is a pivotal tool (i) to construct (frequency-limited)
reduced order dynamical models appropriate for model-based control design and
(ii) to accurately discretise controllers in view of on-board computer-limited
implementation. These contributions are illustrated along the paper through the
design of an active feedback gust load alleviation function, applied on an
industrial generic business jet aircraft use-case. The closed-loop validation
and performances evaluation are assessed through the use of an industrial
dedicated simulator and considering certification objectives. Although
application is centred on aircraft applications, the method is not restrictive
and can be extended to any linear dynamical systems.Comment: 23 pages, 9 figures, submitted to journa
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