Skip to Main content Skip to Navigation
Theses

Méthode d'identification d'un impact appliqué sur une structure admettant des modes de vibration basse fréquence faiblement amortis et bien séparés

Abstract : Many industrial structures operate in an environment with a high risk of collision. The detection of impacts and the assessment of their severity is a major preoccupation in Structural Health Monitoring. This work deals with the development of an impact identification technique that is applicable to a large composite structure, numerically robust and time efficient, and that requires a low number of sensors. The first step was to describe the image of the impact point in the vibration response as a modal participation vector. The idea was to introduce the existence of a discriminating modes familly to make a bijective link between the modal participations and the impact point. A least-squares procedure is developed to estimate those modal participations by measuring the vibration response of a single point on the structure. The second step was to extend the procedure to the identification of a parametric law representing the impact load history. Some conditions on measurement parameters and modal properties of the structure are identified to guarantee both the accuracy and the robustness of the procedure. The approach developed in this work is new regarding the state of the art: only one measurement point is considered for identifying an impact event. An experimental validation on an A350 crown panel indicates that the methodology is valid for large composite structures.
Complete list of metadatas

Cited literature [73 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02125320
Contributor : Abes Star :  Contact
Submitted on : Friday, May 10, 2019 - 12:58:10 PM
Last modification on : Friday, June 26, 2020 - 2:26:38 PM
Long-term archiving on: : Thursday, October 10, 2019 - 1:54:32 PM

File

TheseGOUTAUDIER.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02125320, version 1

Citation

Dimitri Goutaudier. Méthode d'identification d'un impact appliqué sur une structure admettant des modes de vibration basse fréquence faiblement amortis et bien séparés. Mécanique [physics.med-ph]. Conservatoire national des arts et metiers - CNAM, 2019. Français. ⟨NNT : 2019CNAM1225⟩. ⟨tel-02125320⟩

Share

Metrics

Record views

633

Files downloads

302