Recognition method for damage differentiation and damage expansion of guided wave detection
An identification method and guided wave technology are applied in the processing of detection response signals and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., which can solve problems such as missed or misjudgment, incompletely clear mechanisms, and complex guided wave modes. achieve high accuracy
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Embodiment 1
[0053] Such as figure 1 As shown, this embodiment provides a damage discrimination and damage extension recognition method, the method includes the following steps:
[0054] S1. Obtain the guided wave signal of the comparison member.
[0055] The comparison component is an intact component, which has the same specifications as the tested component. To obtain the guided wave signal of the comparison component, firstly, according to the actual detection requirements, a guided wave is excited in the comparison component, so that the guide wave The wave propagates in the detection area, and then the guided wave is received by the transducer, and the guided wave signal is used as the guided wave signal of the comparison member; preferably, the excited guided wave is one or more specific types suitable for nondestructive testing. Modal guided waves.
[0056] In the detection process of the above-mentioned guided wave, the same probe can be used for the excitation and reception of ...
Embodiment 2
[0075] This embodiment is used for the damage discrimination and damage expansion identification of rail flaw detection. For the convenience of explanation, the basic rail with a length of 5.62 meters is selected as the detection object without loss of generality. The side cracked rail was used as the tested member, and its damage extended from 5.5mm deep to 7.7mm deep.
[0076] The damage discrimination and damage extension recognition method in this embodiment includes the following steps:
[0077] 1) Near one end of the intact rail, 50kHz is used as the excitation center frequency to excite the vertical bending mode guided wave propagating along the length direction of the rail, which is used for rail flaw detection, and a transducer with broadband characteristics is used to receive the wave in the rail at the same end guided wave, the received signal as Figure 4 As shown, it is easy to see the excitation wave, the front (excitation end) echo and the end echo.
[0078] 2...
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