Castro-Moura, Eslie R.

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    Vibration-based stiffness and damping matrices updating of a sandwich composite bean
    (2004-05) Castro-Moura, Eslie R.; Just-Agosto, Frederick A.; College of Engineering; Serrano, David; Shafiq, Abdul Basir; Department of Mechanical Engineering; Suárez, Luis E.
    This investigation seeks to develop a dynamic model capable of predicting the dynamic behavior of a sandwich composite beam. This work is based on the previous works of Lancaster, Pilkey and Ortiz. A vibration-based methodology is presented to calculate and update both the damping and stiffness matrices of the model. Initially a Finite Element Model (FEM) of the beam is developed. Along with this model, modal properties of the beam system are obtained from Frequency Response Functions (FRF). With this information, an iterative computational algorithm is used to identify the damping matrix of the system and update the stiffness matrix. These two updated matrices, along with the mass matrix obtained from the FEM, make up the analytical model of the structure. This analytical model is used to generate FRF’s, which are in turn compared to their experimental counterparts. Damage was induced in the beams and studied. The results showed that the analytical models could be adjusted to the damaged beams. The dynamic behavior of the beam system could be predicted with the analytical model. Therefore, the damping and stiffness matrices identified and updated by the algorithm adequately represent the structure’s damping and stiffness characteristics.