An Algorithm for Acoustic Ray Tracing in the r-zone of Curved Fiber Reinforced Resin Matrix Composite Multidirectional Plates

Abstract

The invention discloses an acoustic ray tracing algorithm in the R zone of a multi-directional plate of a curved fiber-reinforced resin-based composite material, which belongs to the technical field of ultrasonic detection of composite materials. The algorithm includes meshing the R zone along the circumferential direction and the thickness direction; establishing the functional relationship of the sound velocity in the R zone of the FRP composite multi-directional plate with respect to the spatial position and the sound propagation direction angle, that is, the sound velocity model; according to the starting and target points The relative position relationship between grid nodes defines the connection relationship and connection weight value between grid nodes; according to the principle of Fermat's shortest sound time, use Dijkstra's shortest path search algorithm to search and calculate the ultrasonic wave between the starting point and the target point from the grid nodes transmission path and time. This algorithm can realize the accurate and fast inversion calculation of the sound propagation path and time between any two points in the R zone of the FRP composite multi-directional plate, which lays the foundation for quantitative evaluation of the influence of materials on the sound propagation behavior, and provides a basis for phased array ultrasonic imaging detection and inversion. Provides tools for playing a large number of ray paths.

Description

technical field [0001] The invention relates to a sound ray tracing algorithm in the R zone of a curved fiber reinforced plastic (FRP) multi-directional plate, which belongs to the technical field of ultrasonic detection of composite materials. Background technique [0002] Due to its light weight, high strength and strong designability, fiber reinforced resin matrix composites (Fiber Reinforced Plastics, CFRP) are increasingly replacing metals in load-bearing components of aircraft, rockets and wind turbine blades. These components are generally large in size and complex in shape, and there are a large number of corner areas (that is, R areas), which are weak links in the manufacturing and service stages. In order to realize the quality control of FRP components, it is necessary to detect internal defects in the R zone in time with the help of non-destructive testing technology. Among them, ultrasonic testing technology is the most widely used and has the greatest developme...

AI Technical Summary

Problems solved by technology

However, if the above two acoustic ray tracing methods are used for post-processing and reconstruction of ultrasound images, a large number of iterative operations need to be performed, the efficiency is low, and the application is limited.

Moreover, for the R zone of the FRP multi-directional panel with more complex acoustic characteristics, the sound ray path will not only change the propagation direction continuously inside the single ply, but also deflect when passing through the ply interface. R area is more complicated

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