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Damping characterisation of glued structures, extracting damping parameters needed

This results consist of methodologies and procedures to be used to characterise new material (e.g. glues and composite), especially for damping point of view, and to validate Fem model of structures regarding dynamic behaviour of proposed LDS solutions (through numerical-experimental comparison of natural frequencies and amplitude of vibration response).

The requirements for this objectives were an accurate estimation of natural frequencies and a description of the mode shapes using just sufficient detail and accuracy to permit their identification and correlation with those obtained from FEM.

The study involved forced vibration analysis (FRF) assuming a harmonic excitation, involving mass, stiffness, viscous damping and structural damping as matrixes. This problem needed a more complicated FE model than those used in the conventional free vibration calculation. As the required solution needed a definition of the ‘mobility matrix’, the first stage was to determine test procedures and an appropriate set of mobility functions by experimental tests.

The second stage was to define the appropriate parameters of the chosen FE model. Theoretical and experimental damping data were then compared to evaluate and review simulation tools. Test based on the proposed method were performed on different kinds of glues and on five LDS samples manufactured by EDERENA.

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