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probleme dans l'analyse modale sur Robot


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bonjour 

lors d'analyse modale je trouve toujours une fréquence inférieur a 33Hz et la masse modale cumulé j'atteint pas 90% même  lorsque j'ajoute des modes 

voici le tableau de l'analyse modale 

merci pour l'aide

image.thumb.png.20bb4bd2788e89cae1b61d3fd3d4acee.png

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