画像処理を用いた構造物の損傷探知 (第1報,接合部の損傷探知)

In this paper, we intended to develop a new method for detecting a join failure in the structure by using the image processing technique. The failure reduces the stiffness at the joint and affects the vibration mode of the structure. First, the deflection and the rotation of the joint were measured by processing the captured joint image data. Then, the rotational stiffness of the joint was estimated by calculating the stiffness of the finite element model of the structure. To this purpose, we developed two methods ; one method could estimated the rotational stiffness coefficient directly and the other updated this coefficient re-cursively by using the simulate annealing method. The joint failure was precisely identified as the reduction of the rotational stiffness coefficient of the joint.