A method for detecting defects of power tower stay rods based on piezoelectric transducer side-loaded f-mode guided waves
A technology of piezoelectric transducers and modal guided waves, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problem of high requirements for testing equipment and achieve the effect of ensuring stability
Active Publication Date: 2019-11-22
NANCHANG HANGKONG UNIVERSITY
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Beijing University of Technology uses piezoelectric sensors to load multiple piezoelectric chip arrays on the side of the round steel rod, and excites the L-mode guided wave to detect the defects of the round steel rod. Although this method can detect the defects of the rod-shaped member, the It is necessary to use multi-channel instruments to control multiple piezoelectric wafers at the same time, which requires high requirements for testing equipment
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[0019] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.
[0020] Such as figure 1 Shown, the present invention works and implements like this, based on the method for piezoelectric transducer side-loaded F mode guided wave detection power tower cable rod defect, it is characterized in that method steps are as follows:
[0021] Step 1: Calculate the phase velocity and group velocity dispersion curve of the ultrasonic guided wave in the component according to the geometric dimensions and material parameters of the stay rod, and determine the excitation frequency of the F(1,1) mode within the frequency range of 50-150kHz ;
[0022] Step 2: According to the phase velocity of the F(1,1) ...
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Abstract
The invention discloses a method for detecting defect of a power iron tower anchor pole based on F mode guide wave loaded on side of a piezoelectric transducer and belongs to the nondestructive examination field of power facilities. According to the method, a piezo-electric wafer and a wedge are combined to form an angle probe which is fixed on the side of the anchor pole, and F (1,1) mode guide wave is excited to detect defect of the power iron tower anchor pole; the method comprises the following steps: step one: determining excitation frequency of the F (1,1) mode; step two: selecting the wedge angle of the excited F (1,1) mode; step three: fixing the angle probe on the side of the anchor pole; step four: building a detection device by using a computer, an arbitrary waveform generator and the angle probe; step five: adjusting detection parameters, and positioning the defect according to the defect reflection back wave time and group velocity of the F(1,1) mode. The method has the technical effects that the defect in the power iron tower anchor pole can be quickly and effectively detected by using the F(1,1) mode guide wave, and the defect can be quickly positioned.
Description
technical field [0001] The invention relates to an ultrasonic guided wave detection method in the field of non-destructive testing, in particular to a method for detecting defects of electric tower pull rods based on piezoelectric transducer side-loaded F-mode guided waves. Background technique [0002] The power tower is a key facility for erecting high-voltage transmission lines. In order to make the power tower stable and reliable, it needs to be reinforced with guy rods. The stay rod is actually a kind of anchor rod, and its quality status has a great influence on the reinforcement of the power tower. It needs to be monitored and evaluated by effective non-destructive testing methods. Ultrasonic guided wave detection technology has the advantages of one excitation, large area and large-scale transmission, so it is suitable for long-distance rapid detection. [0003] At present, many researchers at home and abroad use L-mode to detect rod-shaped components with ultrasoni...
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IPC IPC(8): G01N29/07
Inventor 卢超戴翔陈果
Owner NANCHANG HANGKONG UNIVERSITY