Research on Bridge Cable Damnification Positioning Based on Magnetostriction Technology

The basic theory and test principle of magnetostrictive technology were described.The nondestructive testing equipment for cable based on magnetostrictive technology was developed.Three systems in the equipment,including incentive signal generating system,power amplifying system and guided wave testing system,were explained.Moreover,the principle of cable damnification positioning by the equipment was analyzed.Testing cables with defects were designed and manufactured,and the experiment data were acquired and analyzed.The results show that(1) the magnetostrictive technology and the developed testing equipment can realize the cable damnification positioning well;(2) the sensor can detect damage in the distance,without contacting the damage position;(3) the testing precision and deficiency of guided wave are related to the distance between sensors,the closer the sensor nears damage,the higher the testing precision in the testing range of guided wave.