Identification of random force acting on a layered structure

Abstract

In this study, we proposed a method for identifying random forces, assuming the case where random forces such as wind act on the layered structure. The identification method is to identify the power and cross spectrum of random force from the power and cross spectrum of measured response and the frequency response function of the structure identified in advance. After constructing the identification method for a general layered structure, we specifically took up a three-layered structure and verified the proposed method. In numerical examples, experiments, and numerical examples reproducing experiments, the power spectrum of the random force acting on the structure in the direct analysis could be identified with sufficient accuracy by the proposed method, so it was shown that the proposed method was effective for identification of random excitation.