Poisson’s ratio is 0.3, the density of 7800 kg, and unit type is solid 45 units.

For the transient dynamics analysis type, we select the FULL method, select the superposition of a single audio signal after 5 cycles hanning window regulator, the signal frequency is 100 kHz. The finite element model was shown in Figure 2. The defects are Circumferential defects, and the defect length is divided into an integer multiple of the grid.