Research on damage detection of reticulated shell

Based upon the characteristics of reticulated shells, the representation of residual modal force is derived The concept of sensitive mode shape corresponding to the local damage is introduced and the modal assurance criterion (MAC) is used to determine it. Guyan reduction technique is employed to reduce the analytical model to the test DOFs. The residual modal force and the minimum rank perturbation theory are used to identify the location and extent of the damage using the sensitive mode shapes. Meanwhile, the effect of measurement noise is considered. A single-layer Kiewitt spherical reticulated shell with three simulated damage scenarios is used to demonstrate the approach. The results show that the proposed method can determine the single and multiple damages and evaluate the damage extent in stiffness and mass. It is feasible to damage detection in reticulated shells.