Method for detecting defect of power iron tower anchor pole based on F mode guide wave loaded on side of piezoelectric transducer

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...

AI Technical Summary

Problems solved by technology

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

Images