Simulation Technology Research On Circular Array Ultrasonic Inspection

The quality of Column Product have affected directly the overall performance of the system, there is certain practical significance to research column product quality ultrasonic test technology. In recent years, with the development of ultrasonic test mathematical model and popularization of high-capacity personal computer, the analog of process for ultrasonic nondestructive testing and simulation become a research hotspot.The paper analyzed the ultrasonic propagation behavior, and described the model of the sound field analysis for multi-Gaussian beam theory. This model can simulate the wave fields of planar transducers radiating at oblique incident through a curved fluid-solid interface. The MGB model is highly efficient. Then ultrasonic wave field is simulated an visualized on a personal computer in a highly efficient manner based on the multi-gaussian beam model. In order to verify the simulation field, the ultrasonic wave field radiating by a planar transducer was measured by Rayleigh-Sommerfeld integral model. By comparing the simulation field with the measured field, it is found that MGB is accurate in the far-field and most near-field region. Thus it is reasonable and valid to analyze the actual ultrasonic inspection field using the MGB model.Towards the structure of columnar product, it was proposed annular array ultrasonic testing program. Based on multi-Gaussian beam theory, it was established array ultrasonic testing model, and simulated superimposed sound field of the array ultrasound probe, analyses the range of array ultrasonic test radiated sound field from the result of simulation, simulate analyses the beam propagation process when ultrasonic meet the defect during the propagation, it made the process visualization become true. The results proves there are wider range for array ultrasonic testing, it provided theoretical basis for the feasibility of quality test on line for the columnar products. On the basis of multi-Gaussian beam theory and Kirchhoff's approximation theory, according to the measurement model of spherical pore, it was predicted the pulse echo signal for the spherical pore array ultrasonic testing. Compared with the experimental signal, it verified the effectiveness of the model. By adopting the intersection location method to process and analysis simulated pulse echo signal, the defect type was reconstructed. The results proves that , the deviation of the location and size is smaller between reconstruction defect parts and actual defect parts, it is fully demonstrated that this test proposal adopting array ultrasonic to test columnar products quality is feasible.