An Frequency Response Function-Based Damage Identification Method for Cylindrical Shell Structures

초록

In this paper, a structural damage identification method (SDIM) is developed for cylindrical shells. The SDIM is derived from the frequency response function solved from the structural dynamic equa-tions of damaged cylindrical shells. A damage distri-bution function is used to represent the distribution and magnitudes of local damages within a cylindrical shell. In contrast with most existing modal parame-ters-based SDIMs which require the modal parame-ters measured in both intact and damaged states, only the FRF-data measured in the damaged state is re-quired in the present SDIM. By virtue of utilizing FRF-data, one is able to make the inverse problem of damage identification well-posed by choosing as many sets of excitation frequency and FRF meas-urement point as needed to obtain a sufficient num-ber of equations. The numerically simulated damage identification tests are conducted to study the feasi-bility of the present SDIM.