Research of Integrated Ultrasonic Auto Detecting Method on Curved Surfaces

Abstract

Processing and technology of ultrasonic nondestructive test (NDT) for curved surface is complex. To improve the detection quality and efficiency of detection of parts of curved surface, modeling data must be obtained for path planning so that detection path can fit the surface of complex surfaces part. So, current situation of curved surfaces detection is surveyed. Then, an integrated ultrasonic NDT system is put forward, which is characterized by: ① Use of ultrasonic measurement and reverse of curved surface to solve the CAD data problem; ② Establish kinematics model for ultrasonic NDT robot with Denavit-Hartenberg theory, then, discretize the CAD model of curved surface, and then, create file of kinematics points for the manipulators by kinematics backward analysis; ③ Use of an automatic sensitivity compensation algorithm based on the part’s modeling information obtained in surface reverse to fit the variety of the thickness. The system features integration of low cost and mature technologies, and is suitable for detection of various parts of different complex surfaces in medium-and-small-scale enterprises. The test results showed that the system can automatically detect parts of complex surface successfully, and the inspection result is good and reliable.