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

Jhinaoui, Ahmed and Mevel, Laurent and Morlier, Joseph A new SSI algorithm for LPTV systems: Application to a hinged-bladed helicopter. (2014) Mechanical Systems and Signal Processing, 42 (1-2). 152-166. ISSN 0888-3270

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.ymssp.2013.08.006


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.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Mechanical Systems and Signal Processing website: http://www.sciencedirect.com/science/journal/aip/08883270
HAL Id:hal-00863703
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Institut National de la Recherche en Informatique et en Automatique - INRIA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Laboratory name:
Deposited On:27 Sep 2013 10:00

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