ひずみ応答を用いたモード形状計測に基づくはり構造の損傷位置推定

概要

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To detect damage at possible stage is important in aerospace and other mechanical engineering industries. Damages in a structure change its dynamic behavior such as natural frequencies, damping and mode shapes. Vibration analysis of a beam is made to estimate the mode shape from measuring strain response under impulse loads. The analysis is illustrative of the validity of the mode shape from experimental strain response of a beam. As an experimental validation, cantilever beams with damage are tested. The damage is modeled as a notch. Continuous wavelet transform is applied to the mode shape which is estimated by strain response under impulse loads. Position of the damage is shown as a negative peak of the wavelet transform. The identified positions of damage are very close to the actual positions of damage except for existing damage near free edge of the beam.
2009-05-25