Dynamics of Damaged Plates

초록

It is very important to well understand the dynamic characteristics of damaged structures to successfully develop or choose a most appropriate structural damage identification method (SDIM) as the means of non-destructive testing. Thus, the dynamic equation of motion for damaged plates is derived in this paper by introducing a damage distribution function, which may characterize the state of damage. It is found that damages induce the coupling between modal coordinates. The effects of damages on the vibration characteristics of a plate depending on their locations, sizes, and magnitudes are numerically investigated in a systematic way. The numerical investigations are also given to the effects of damage-induced modal coupling on the changes in vibration characteristics and to the mini- mum number of natural modes required to predict sufficiently accurate vibration characteristics of damaged plate