Design of Adjustable-force Piezoelectric Array Ultrasonic Guided Waves Sensor for Messenger Cable and Damage Detection
For the existing non-destructive testing methods are difficult to accurately detect the damage of messenger cable in anchor clamp zone,a novel adjustable-force piezoelectric array ultrasonic guided waves sensor is designed,and applied to the damage detection of the outer strand of the messenger cable in the cladding area.Firstly,the ultrasonic guided waves propagation characteristics was analyzed by solving the dispersion curve of helical curved rod structure based on helical coordinate system.Secondly,the piezoelectric ultrasonic guided waves sensing module,the adjustable force pressing base module and the probe calibration module were developed.Thirdly,the influence of detection contact forces on the amplitude of the first wave was analyzed.Finally,an experimental platform was built and the damage detection effect of the adjustable force piezoelectric array ultrasonic guided waves sensor for the outer strand of messenger cable in anchor clamp zone was verified.The results show that the L(0,1)mode guide waves in the range of 0-200 kHz and the detection contact force of 300-500 N have better detection effect.The reflection signal has a great detection and localization ability for broken strand of messenger cable in anchor clamp zone,and the damage location error can reach 0.38％.
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