A new SSI algorithm for LPTV systems: application to a hinged-bladed helicopter

Ahmed Jhinaoui 1 Laurent Mevel 1 Joseph Morlier 2
1 I4S - Statistical Inference for Structural Health Monitoring
IFSTTAR/COSYS - Département Composants et Systèmes, Inria Rennes – Bretagne Atlantique
Abstract : Many systems such as turbo-generators, wind turbines and helicopters show intrinsic time-periodic behaviors. Usually, these structures are considered to be faithfully modeled as linear time-invariant (LTI). In some cases where the rotor is anisotropic, this modeling does not hold and the equations of motion lead necessarily to a linear periodically time- varying (referred to as LPTV in the control and digital signal field or LTP in the mechanical and nonlinear dynamics world) model. Classical modal analysis methodologies based on the classical time-invariant eigenstructure (frequencies and damping ratios) of the system no more apply. This is the case in particular for subspace methods. For such time-periodic systems, the modal analysis can be described by characteristic exponents called Floquet multipliers. The aim of this paper is to suggest a new subspace-based algorithm that is able to extract these multipliers and the corresponding frequencies and damping ratios. The algorithm is then tested on a numerical model of a hinged-bladed helicopter on the ground.
Liste complète des métadonnées

Littérature citée [10 références]  Voir  Masquer  Télécharger

Contributeur : Laurent Mevel <>
Soumis le : lundi 30 juillet 2018 - 14:45:07
Dernière modification le : mardi 12 mars 2019 - 16:12:38
Document(s) archivé(s) le : mercredi 31 octobre 2018 - 13:22:44


Fichiers produits par l'(les) auteur(s)




Ahmed Jhinaoui, Laurent Mevel, Joseph Morlier. A new SSI algorithm for LPTV systems: application to a hinged-bladed helicopter. Mechanical Systems and Signal Processing, Elsevier, 2014, 42 (1), pp.152--166. 〈10.1016/j.ymssp.2013.08.006〉. 〈hal-00863703〉



Consultations de la notice


Téléchargements de fichiers