9 June 1999 Real-time impact identification of stiffened composite panels
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An investigation was conducted to develop a real-time identification technique for the prediction of location and force history of low-velocity impacts on composite panels with beam stiffeners. Both analysis and experiments were conducted during the investigation. The technique used measurements from built-in piezoceramic sensors to reconstruct the force history using the smoother-filter algorithm. Impact location was determined by minimizing the difference between modeled response and actual response. A computer code was developed from a model for composite plates that allowed for the variation of structural properties (mass and stiffness) due to the presence of the stiffeners. The model was generalized so that it could potentially be used for any panel that has discontinuous material properties. Extensive experiments were conducted to verify the model and the computer code for impacts both in the bay and on the stiffener. The identification technique, as implemented on a personal computer, demonstrated real- time capability, and good agreement was found between predicted and actual force history and location. Parametric studies on the effects of sensor placement and impact mass on impact prediction were conducted.
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Robert E. Seydel, Robert E. Seydel, Fu-Kuo Chang, Fu-Kuo Chang, } "Real-time impact identification of stiffened composite panels", Proc. SPIE 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems, (9 June 1999); doi: 10.1117/12.350708; https://doi.org/10.1117/12.350708

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