Reconstruction and separation of vibratory field using structural holography - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Sound and Vibration Année : 2016

Reconstruction and separation of vibratory field using structural holography

(1) , (1) , (2) , (1)
1
2

Résumé

A method fo rreconstructing and separating vibratory field on a plate-like structure is presented. The method, called “Structural Holography” is derived from classical Near-field Acoustic Holography (NAH) but in the vibratory domain. In this case, the plate displacement is measured on one-dimensional lines (the holograms) and used to reconstruct the entire two-dimensional displacement field. As a consequence, remote measurements on non directly accessible zones are possible with Structural Holography. Moreover, as it is based on the decomposition of the field into forth and back waves, Structural Holography permits to separate forces in the case of multi-sources excitation. The theoretical back- ground of the Structural Holography method is described first. Then, to illustrate the process and the possibilities of Structural Holography, the academic test case of an infinite plate excited by few point forces is presented. With the principle of vibratory field separation, the displacement fields produced by each point force separately is reconstructed. However, the displacement field is not always meaningful and some additional treatments are mandatory to localize the position of point forces for example. From the simple example of an infinite plate, a post-processing based on the reconstruction of the structural intensity field is thus proposed. Finally, Structural Holography is generalized to finite plates and applied to real experimental measurements.
Fichier non déposé

Dates et versions

hal-01470442 , version 1 (17-02-2017)

Identifiants

Citer

C. Chesnais, N. Totaro, Jean-Hugh Thomas, Jean-Louis Guyader. Reconstruction and separation of vibratory field using structural holography. Journal of Sound and Vibration, 2016, 389 (2), pp.134 - 152. ⟨10.1016/j.jsv.2016.10.042⟩. ⟨hal-01470442⟩
103 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More