An FFT-based approach for dynamic response prediction of non-periodic systems

In this work, a combined experimental and numerical approach, called Extended Load Confluence Algorithm (ELCA), is presented to effectively improve the accuracy of the dynamic modeling of a structural system through an iterative approach. ELCA reconstructs the full-field dynamic response based on a numerical model of the system, its modal expansion and a few experimental measurements. From an initial guess of the applied loads, the algorithm updates it at each iteration to improve the accuracy in the representation of the dynamic response. Numerical validation cases are presented to show the effectiveness of proposed approach. The convenience of the proposed approach can be considerably beneficial when applied to structures with complex loading conditions in aerospace and mechanical applications.