An ultrasonic phased array nondestructive test method based on fractal
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An ultrasonic phased array, non-destructive testing technology, applied in the direction of processing the response signal of the detection, can solve the problems of high cost and difficult implementation.
Active Publication Date: 2015-04-22
CIVIL AVIATION UNIV OF CHINA
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To achieve non-destructive testing of composite materials with unknown defects, the cost of hardware implem
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Embodiment 1
[0078] Such as Figure 1 to Figure 13 Shown: the tested object of embodiment 1 is the stainless steel block that does not have defect, and each element 1#-8# of ultrasonic phased array emits the wave form picture separately Figure 4 — Figure 11 , it can be seen that the eight graphics are not exactly the same, that is, the signal characteristics collected by each array element are different. In order to comprehensively utilize the useful information characteristics provided by each signal and eliminate the wrong information characteristics, a Bayesian information fusion algorithm is used. The concrete algorithm of embodiment 1 goes out figure 1 — figure 2 flow chart.
[0079] The steps of embodiment 1 are as follows:
[0080] (1) Import the text data obtained by the single emission of 1#-8# array elements into MATALB to form 8 arrays A1, A2, A3, A4, A5, A6, A7, A8 of 1088 dimensions and 1 column;
[0081] (2) Calculate the effective fusion elements of 8 arrays respecti...
Embodiment 2
[0088] The measured object of embodiment 2 is a composite material with unwelded defects, and the waveform diagrams of each array element 1#-8# of the ultrasonic phased array emitted separately are as follows: Figure 14 — Figure 21 .
[0089] Embodiment 2 steps are as follows:
[0090] (1) Import the text data obtained by the single emission of 1#-8# array elements into MATALB to form 8 arrays A1, A2, A3, A4, A5, A6, A7, A8 of 704 dimensions and 1 column;
[0091] (2) Calculate the effective fusion elements of 8 arrays respectively by the bitmap method to form matrix Y;
[0092] (3) Establishment of Bayesian estimation
[0093] The effective data obtained by each column of the matrix X is fused using Bayesian estimation, and each column finally obtains a best estimate, and the best estimate of each column forms an array x with 1-dimensional 704 columns, and uses MATLAB for simulation to obtain Figure 22 .
[0094] (4) Establishment of fractal algorithm
[0095] The sc...
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Abstract
An ultrasonic phased array nondestructive test method based on fractal is disclosed. The method comprises following two parts: Bayesian information fusion algorithm and signal fractal processing. The Bayesian information fusion algorithm includes following steps of: taking each array element of a ultrasonic phased array probe, separately collecting a median, an upper quartile and a lower quartile in signals in sequence to obtain a quartile dispersion, solving an eliminative point to obtain an effective data fusion set, solving characteristic functions and decision functions of effective data to obtain a risk function, and extracting Bayesian risk of the decision functions to obtain optimal estimated values of parameters. The signal fractal processing includes following steps of: analyzing image fractal characteristics through a wavelet decomposition coefficient figure to determine a scale-free zone, calculating a fractal dimension, and determining whether a flaw exists and determining a flaw type according to the fractal dimension. Based on adoption of the Bayesian information fusion algorithm to improve the information utilization rate, the method adopts a fractal technology to process nonlinear modern signals so as to determine whether a flaw exists in a composite material and to determine a flaw type.
Description
technical field [0001] The invention belongs to the field of modern ultrasonic signal processing, in particular to a fractal-based ultrasonic phased array nondestructive testing method. Background technique [0002] Ultrasonic phased array technology was proposed in the 1980s, and it was mainly used in medical ultrasound imaging diagnosis in the early stage. In recent years, ultrasonic phased array technology has developed rapidly at home and abroad, and research in medical diagnosis and industrial testing is very popular. With the continuous development of ultrasonic phased array system design, system simulation and practical application, phased array technology is gradually going digital. With the continuous development of ultrasonic phased array technology development and application, phased array technology has been used in non-destructive testing of composite materials and so on. However, due to the variety of composite structures, the requirements for use are also di...
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