On the basis of 3-D reconstruction of the solid rocket motor volume data

the three-dimensional similarity transformation templates compliant with the volume data features of debonding

bubbles and slag inclusion were built.The volume data fields of various defects were located by 3-D similarity transformation.The defect geometric center was selected as the mark point for defect accurate positioning

and the calculation method in volume space of the defect geometric center was given.The simulated solid rocket motor with preset typical defects was designed.Through the experiment

the ratio of the measured distance between the geometric center and the actual geometric center

to the maximum diameter is less than 10%.That's to say

the measured geometric center and the actual geometric center are very close

and the positioning of the geometric center of defects is accurate.