论文部分内容阅读
Position and size monitoring of fatigue cracks in metal structures is of great concern to manufacturers as well as maintenance personnel for significantly improving safety and reliability of aircraft.Much progress has been made for crack position monitoring in the past few years.However, crack size monitoring is still very challenging.In this study, Fastest Time of Flight Diffraction (FTOFD) method was developed to monitor both the position and size of a crack.FTOFD method uses an integrated sensor network to activate and receive ultrasonic waves in a structure.Diffraction waves will be generated when ultrasonic waves pass a crack.These diffraction waves are then received and analyzed to get the position and size of the crack.Experiment results showed that the monitored size of the simulated crack is very close to the real size of the crack.