Detection of fatigue crack on a rotating steel shaft using air-coupled nonlinear ultrasonic modulation

Song, Byeongju; Park, Byeongjin; Sohn, Hoon; Lim, Cheol-Woo; Park, Jae-Roung

doi:10.1117/12.2084982

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In this study, the performance of the proposed technique is experimentally validated by ultrasonic responses obtained from the half-scale and full-scale steel shaft specimens. Song [23] and Lim [24] also have done a lot of researches in this field and gained significant achievements.…”

Section: Introductionmentioning

confidence: 99%

Method for evaluation of surface crack size of wind turbine main shaft by using ultrasonic diffracted waves

Cheng¹,

He²,

Lyu³

et al. 2020

Smart Mater. Struct.

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The structural damage in the main shaft threatens the service safety of the wind turbine directly. The mechanical properties of the in-service main shaft tend to degrade severely due to the transverse cracks extending from the outer circumference. In the health monitoring of the shaft, it is of great importance not only to identify the cracks, but also to accurately evaluate the crack size. In this research, a novel quantitative method is proposed for the transverse crack characterization. The diffracted waves from the crack tip received in the central hole of the shaft are used to construct elliptic trajectories of beam path. The crack position and its depth can be determined by the intersection of the trajectories. Furthermore, a crack size quantification model is established, and the numerical demonstration is given for evaluation of crack position and depth. Meanwhile, an acoustic finite element model is developed, in which the path of the acoustic waves radiated from the end face of the shaft is analyzed in detail. The quantitative method is well confirmed by the simulation of cracks at different locations with different depths. Considering the accuracy of crack evaluation from a large size zone, the time of diffracted echo is calibrated by measuring the time shift of the transducers. A shaft sample with a transverse crack was used to implement the experimental verification. Totally, the sizing error is less than 5 mm, which indicates that this proposed method is effective for the evaluation of surface cracks in the main shaft.

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Section: Introductionmentioning

confidence: 99%