장대 현수교 보강거더의 가설순서는 다양한 방식에 대해서 검토가 이루어지며, 플러터 안정성의 확보를 위한 가설계획 수립에는 3차원 전체교량 모형실험과 정밀한 플러터 해석기술이 적용되고 있다. 본 연구에서는 구조적 특이성으로 인해 다양한 진동모드간의 상호간섭이 예측되는 3차원 경사주탑 현수교를 대상으로, 풍하중에 의한 정적변형을 고려한 고유치해석과 영각변화에 따른 비정상공기력계수의 변화를 동시에 고려한, 플러터 해석방법의 적용성을 검토하였다.

In this study, a MFL (Magnetic Flux Leakage) image based 3D inspection system which is incorporated into a cable climbing robot was investigated for Steel Cable NDT of Cable-stayed Bridge and Suspension Bridge. Firstly, a MFL sensor head prototype composed of two permanent magnets and eight hall sensors was designed and fabricated. A steel cable specimen with several types of damage was inflicted and scanned by the MFL sensor head to measure the magnetic flux density of the specimen. The measured MFL signals were used to interpret the healthy condition of the steel cable. For improving the resolution and quantification of the damage level, digital signal processing techniques were performed. Finally, the measured MFL signals were visualized by using 3D imaging method.