Because of the characteristics of wind turbine,it is not convenient to disassemble and test the high-strength bolts of blades and other components during maintenance.Based on the theoretical analysis,the testing technology of phased array ultrasonic guided wave is studied,the testing technology and scheme of in-service bolts are established,and the in-service bolts can be tested without disassembly,the u-tility model can effectively avoid the risk of the bolt fracture caused by the harmful defects such as cracks.
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