The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper aims to highlight the possibility of interactively determining the performance of dynamic systems using virtual instrumentation which include Matlab scripts, so as through this combination it can obtain the of virtual tools that work as simulators for certain systems or processes.
The computational complexity of the finite difference (FD) schemes for the solution of the plate equation prevents them from being used in musical applications. The explicit FD schemes can be parallelized to run on multi-processor arrays for achieving real-time performance. Field Programmable Gate Arrays (FPGAs) provide an ideal platform for implementing these architectures with the advantages of...
In this communication the use of AR modelling in the estimation of cubic phase coupling is studied. After obtaining the trispectrum of an harmonic signal with cubic phase couplings, the parametric modelling is used to design a method that models this trispectrum and allows the locatation of the cubic couplings. This method is based on a twofold AR modelling of the data using their fourth-order cumulants,...
The exciting research concerning the description, analysis, simulation, controller design, and deployment of hybrid systems is reviewed, and perspectives for future developments are discussed. The review attempts to relate precursors to this research, practical motivations, and actual developments. The discussion follows a similar pattern in an attempt to identify topics for future research. Practical...
The open loop optimal control (dynamic optimization) of distributed parameter systems is considered here. These problems are usually solved by the Control Vector Parameterization (CVP) approach, which transforms the original dynamic optimization method into an outer nonlinear programming problem, which requires the solution of an inner initial value problem (IVP). The solution of this IVP (set of...
The paper presents a nodal technique for modeling a large Pressurized Heavy Water Reactor (PHWR). Model equations have been derived from the two group diffusion equations and validated by applying it to a benchmark problem for a large heavy water reactor. The computational results obtained from the model are compared with the benchmark results.
The aim of this paper is to find a fixed structure transfer matrix, whose dynamics (i.e. whose poles) are not a priori fixed, and whose frequency response is the closest as possible to a target one. This non convex optimization problem is recast into a generalized μ problem. A generalized n lower bound is proposed, which provides an a priori suboptimal solution (i.e. a local minimum), namely a transfer...
This paper deals with the robust control of an Autonomous Underwater Vehicle (AUV), using the ℋ∞ approach for Linear Parameter Varying (LPV) polytopic systems. This method seems to be adapted to this kind of system because of the important non-linearities and the uncertainties on the hydrodynamics parameters. After the presentation of the nonlinear model of the AUV considered for the study, an LPV...
In this work a new approach to the control of a simulated moving bed (SMB) plant is presented. The approach is based on the combination of Nonlinear Model Predictive Control (NMPC) and the wave theory. The latter will provide the theoretical framework in which the control law will be designed while NMPC will be employed for determining the appropriate parameters of the controller. On the other hand,...
This work considers efficient methods for the optimal control of a bilinear distributed parameter system representing the evolution of a scalar field in a fluid flow. The aim is to influence the flow field in order to maximize fluid mixing. The cost by which performance is judged is the ‘mix-norm’ defined in Mathew, Mezic and Petzold (Physica D 2005). The problem is particularly challenging as a large...
An inverse method is developed to recover for unknown stochastic inputs. The proposed approach relies on an approximate finite impulse response model of the system which is seen as a linearization around the current input estimation. The inversion itself is done within the frequency domain in order to lower the computation cost. This classical approach requires a regularization technique to be used...
The current trend in robotics is to achieve robust, high-speed and precise robots that fulfill the industry's requirements. Parallel robots are proposed as the best solution for some of these tasks due to the advantages offered by their parallel kinematic structure. However, in order to take the most of these advantages, advanced model-based control approaches are needed. In this paper, the dynamic...
The paper deals with the comparison of different mathematical models with regard to their usage in the model-based leak-monitoring scheme. The pipeline is represented as a two-port system. Three models are compared: a nonlinear distributed parameters model, a linearised model whose transcendent transfer function is obtained by a Laplace transformation and corresponding initial and boundary conditions...
A model-based fault management system for a Three Mass Torsion Oscillator is described. Fault management includes fault detection, fault diagnosis and fault compensation. A process model of system dynamics is derived. Friction effects are modelled by a neuro-fuzzy Local Linear Model Tree (LOLIMOT) approach. Parameter estimation is obtained with two simple experiments. A friction estimation stage is...
We consider here the problem of finding a controller for a system such that when interconnected to the plant, we get a system which is bisimilar to the desired system. We give necessary and sufficient conditions for the existence of such a controller. The systems we consider are ordinary linear time invariant dynamical systems described by state space equations. We briefly compare our results with...
This article presents an application of a control strategy developed by the authors to a nonlinear model. The control strategy is based on a sliding mode controller that uses a generalized predictive controller for the reaching mode part. The proposed Predictive Sliding Mode Controller is developed for a First-Order-Plus-Deadtime model that represents a good approximation to many processes. The Predictive...
Model-based Predictive Control (MPC) strategies for discrete time bilinear systems are developed, which incorporate the guarantee of nominal closed loop stability. It is demonstrated how the structure of the bilinear model can be exploited, both for a MPC strategy which is based on the combined use of an end point weighting and end point inequality constraint, and for a MPC strategy which uses the...
Plagiarism is known as illegal use of others' part of work or whole work as one's own in any field such as art, poetry, literature, cinema, research and other creative forms of study. Plagiarism is one of the important issues in academic and research fields and giving more concern in academic systems. The situation is even worse with the availability of ample resources on the web. This paper focuses...
Electrogram-guided ablation has been recently developed for allowing better detection and localization of abnormal atrial activity that may be the source of arrhythmogeneity. Nevertheless, no clear indication for the benefit of using electrograms guided ablation over empirical ablation was established thus far, and there is a clear need of improving the localization of cardiac arrhythmogenic targets...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.