Experimental and Analytical Evaluation of the Modal Parameters Changes of a Large Telescopic Structure

Abstract eng:
Experimental and analytical estimation of changing modals parameters of a 132 meters long telescopic 3D frame ship loading structure is presented. The structure consist of an external 110 meters length 3D steel truss than can move in the horizontal plane and an internal 3D trust that works as extending arm. The amount of arm extension changes continuously according to ship position and loading conditions. Due to the redistribution of mass and rigidity, the modal parameters of the structure changes continuously. To capture the space – frequency characteristic time - frequency system identification techniques were evaluated and presented in this paper: Short Time Frequency Spectrum, the Hilbert-Huang Transform (HHT) and the Wigner-Ville Distribution (WVD). Also an analytical model is used to describe the dynamic behavior of the structure to evaluate the identification methods.

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