643 research outputs found
Interval Prediction for Continuous-Time Systems with Parametric Uncertainties
The problem of behaviour prediction for linear parameter-varying systems is
considered in the interval framework. It is assumed that the system is subject
to uncertain inputs and the vector of scheduling parameters is unmeasurable,
but all uncertainties take values in a given admissible set. Then an interval
predictor is designed and its stability is guaranteed applying Lyapunov
function with a novel structure. The conditions of stability are formulated in
the form of linear matrix inequalities. Efficiency of the theoretical results
is demonstrated in the application to safe motion planning for autonomous
vehicles.Comment: 6 pages, CDC 2019. Website:
https://eleurent.github.io/interval-prediction
Homological mirror symmetry for punctured spheres
We prove that the wrapped Fukaya category of a punctured sphere ( with
an arbitrary number of points removed) is equivalent to the triangulated
category of singularities of a mirror Landau-Ginzburg model, proving one side
of the homological mirror symmetry conjecture in this case. By investigating
fractional gradings on these categories, we conclude that cyclic covers on the
symplectic side are mirror to orbifold quotients of the Landau-Ginzburg model.Comment: 38 pages, 5 figures; v2: minor revisions (similar to published
version
Moment Matching Based Model Reduction for LPV State-Space Models
We present a novel algorithm for reducing the state dimension, i.e. order, of
linear parameter varying (LPV) discrete-time state-space (SS) models with
affine dependence on the scheduling variable. The input-output behavior of the
reduced order model approximates that of the original model. In fact, for input
and scheduling sequences of a certain length, the input-output behaviors of the
reduced and original model coincide. The proposed method can also be
interpreted as a reachability and observability reduction (minimization)
procedure for LPV-SS representations with affine dependence
Enhancement of adaptive observer robustness applying sliding mode techniques
This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.The problem studied in this paper is one of improving the performance of a class of adaptive observer in the presence of exogenous disturbances. The H1 gains of both, a conventional and the newly proposed sliding-mode adaptive observer, are evaluated to assess the effect of disturbances on the estimation errors. It is shown that if the disturbance is \matched" in the plant equations, then including an additional sliding-mode feedback injection term, dependent on the plant output, improves the accuracy of observation
On the robust synchronization of Brockett oscillators
International audienceIn this article, motivated by a recent work of R. Brockett Brockett (2013), we study a robust synchronization problem for multistable Brockett oscillators within an Input-to-State Stability (ISS) framework. Based on a recent generalization of the classical ISS theory to multistable systems and its application to the synchronization of multistable systems, a synchronization protocol is designed with respect to compact invariant sets of the unperturbed Brockett oscillator. The invariant sets are assumed to admit a decomposition without cycles (i.e. with neither homoclinic nor heteroclinic orbits). Contrarily to the local analysis of Brockett (2013), the conditions obtained in our work are global and applicable for family of non-identical oscillators. Numerical simulation examples illustrate our theoretical results
The Alestle - Vol. 58 No. 22 - 11/08/2005
Vol. 58 No. 2
Oscillatority Conditions for Nonlinear Systems with Delay
Sufficient conditions for oscillatority in the sense of Yakubovich for
a class of time delay nonlinear systems are proposed. Under proposed conditions,
upper and lower bounds for oscillation amplitude are given. Examples illustrating
analytical results by computer simulation are presented
Robust Estimation of Fundamental Frequency Positive-Sequence Component for Grid-Integration Applications in Energy Systems
This article studies the problem of fundamental frequency positive-sequence component separation in unbalanced three-phase systems for grid-integration applications. We propose a-simple-to-implement approach involving a modified delayed signal cancellation method and moving average filtering. A delay-based linear-regression framework is considered to make the sequence component separation frequency-adaptive, providing fast and accurate frequency estimation. Comparative experimental results demonstrate the suitability of the proposed method over conventional approaches
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