Damage Detection Using Mode Shape of Beam Structures with Multiple Damages

概要

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Health monitoring is important technique in aerospace and other mechanical engineering structures to prevent structures from breaking down by hidden damages. Damages in a structure change its dynamic behavior such as natural frequencies, damping and mode shapes. Use of this phenomenon is effective for global health monitoring of structures. Flexural vibration analysis of damaged beams is made in Fourier transform to discuss a method of damage detection of beam structures with multiple damages. To analyze an inhomogeneous beam due to existing damages, a damaged beam is modeled as a piecewise continuous beam. Solution of dynamic response of the beam is obtained by taking account of continuity of piecewise connected boundaries. The mode shape of the beam is estimated using value of the peak at first response frequency in Fourier transform under a set of positions of impulse load. It is found that positions of damages can be predicted using wavelet transform of difference between mode shapes for damaged beam and undamaged beam. Validity of the method on the damage detection is also illustrated with experimental result.
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