The ultrasonic phased array focusing model of cylindrical component
When planar phased array ultrasonic transducer is used to detect cylindrical components,the wave front of the scanned acoustic beam is bent due to the impact of incident wave and echo delay caused by the curved interface structure.The traditional iterative traversal algorithm has low efficiency and accuracy error in calculating the delay time,so it can not give full play to the advantages of phased array transducer.Aiming at the above problems,a focusing model of ultrasonic phased array scanning imaging based on the characteristics of cylindrical components and coupled media is established in this paper.Based on the material properties and geometric relations of transducer,coupling medium,cylindrical component,sound model and refraction law,the delay time focusing control model is established to correlate the sound velocity,curvature radius of surface,distance between array and surface of the coupling medium and the component under test.The delay time calculated by the model is used to control the emission time of each array,so as to realize the focus of the scanning sound beam.This paper takes liquid and plexiglass wedges as examples to simulate the phased array beam focusing of cylindrical steel surfaces.The results show that the computational efficiency of the proposed method is significantly improved,and the beam can be focused at a preset position,which verifies the advantages and effectiveness of the proposed model in computational efficiency.
Phased array ultrasonic testingCylindrical memberFocusing model
NETL
NSTL
万方数据
维普
