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Structural Engineering and Mechanics
  Volume 26, Number 2, May30 2007 , pages 179-190

Damage identification in beam-like pipeline based
on modal information
Zhi-Rong Yang, Hong-Sheng Li, Xing-Lin Guo and Hong-Yan Li

    Damage detection based on measured vibration data has received intensive studies recently. Frequently, the damage to a structure may be reflected by a change of some system parameters, such as a degradation of the stiffness. In this paper, we apply a method to nondestructively locate and estimate the severity of damage in corrosion pipeline for which a few natural frequencies or mode shapes are available. The method is based on the strain modal sensitivity ratio (SMSR) and the orthogonality conditions sensitivities (OCS) applied to vibration features identified during the monitoring of the pipeline. The advantage of these methods is that it only requires measuring few modal parameters. The SMSR-based and OCS-based damage detection methods are illustrated using computer-simulated and laboratory testing data. The results show that the current method provides a precise indication of both the location and the extent of corrosion pipeline
Key Words
    damage identification; corrosion pipeline; the strain modal sensitivity ratio; the orthogonality conditions sensitivities; mode shape
Zhi-Rong Yang, Hong-Sheng Li and Xing-Lin Guo; Dept. of Engineering Mechanics, Dalian University of Technology, Dalian, 116024, P.R. China
Hong-Yan Li; Dalian Inspection Institute of Boiler Pressure Container, Dalian, 116013, P.R. China

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