Corrélation entre modes propres et identification de l'état de contrainte d'une structure de tenségrité

ABSTRACT The structures of tensegrity are structures in equilibrium by an initial stress state. This stress state is the composition of elementary selfstress states which form a base. In order to identify the stress state of the structure, a nondestructive method based on the vibratory analysis has been used. The structure is subjected to a sinewave excitation for a given frequency. It appears that certain frequencies allow better an identification than others. This study tries to establish a relation between eigen mode, selfstress state and effectiveness of the identification. The article is based on a plane double layer tensegrity grid having six elementary selfstress states. The numerical simulations show the utility of the study for the identification of this structure.