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Discrete generator coordinate: Symmetry restoration in finite-dimensional spaces
(1999-12-01)
Group theoretical-based techniques and fundamental results from number theory are used in order to allow for the construction of exact projectors in finite-dimensional spaces. These operators are shown to make use only of ...
A reduced order state space model for aeroelastic analysis in time domain
(2017-02-01)
The objective of this paper is to describe a new method for modeling aeroelastic system in time domain based on a modification of the Laguerre Polynomials to represent complex quantities. These polynomials are used to ...
Inclusion of the frequency effect in the lumped parameters transmission line model: State space formulation
(2009-07-01)
The objective of this paper is to include the frequency dependence of the longitudinal parameters in the lumped parameters line model. The distributed nature of the transmission line was approximated by a cascade of π ...
The use of Gramian matrices for aeroelastic stability analysis
(2013-05-13)
Most of the established procedures for analysis of aeroelastic flutter in the development of aircraft are based on frequency domain methods. Proposing new methodologies in this field is always a challenge, because the new ...
Modeling and joint estimation of glottal source and vocal tract filter by state-space methods
(Elsevier, 2017-08)
Accurate estimation of the glottal source from a voiced sound is a difficult blind separation problem in speech signal processing. In this work, state-space methods are investigated to enhance the joint estimation of the ...
Improved method for the calculation of power systems low voltage solutions
(Elsevier Sci LtdOxfordInglaterra, 2002)
Bethe-Salpeter bound-state structure in Minkowski space
(Elsevier B.V., 2016-08-10)
The quantitative investigation of the scalar Bethe-Salpeter equation in Minkowski space, within the ladder-approximation framework, is extended to include the excited states. This study has been carried out for an interacting ...
Modified routine for decreasing numeric oscillations at associations of lumped elements
(Elsevier Science SaLausanneSuíça, 2014)
State-Space Approach to Structural Representation of Perturbed Pitch Period Sequences in Voice Signals
(Mosby-Elsevier, 2015-11)
Objectives: The aim of this study was to propose a state space-based approach to model perturbed pitch period sequences (PPSs), extracted from real sustained vowels, combining the principal features of disturbed real PPSs ...
A note on the state space representation of aeroelastic systems for time domain analysis
(2021-07-01)
The time domain state space model for describing an aeroelastic system has usually been obtained by using rational function approximations to write unsteady aerodynamics in the time domain. This strategy has been employed ...