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Damage detection method in complicated beams with varying flexural stiffness

Damage detection method in complicated beams with varying flexural stiffness
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摘要 A damage detection method for complicated beam-like structures is proposed based on the subsection strain energy method （SSEM）, and its applicability condition is introduced. For a beam with the continuously varying fiexural stiffness and an edge crack, the SSEM is used to detect the crack location effectively by numerical modal shapes. As a complicated beam, the glass fiber-reinforced composite model of a wind turbine blade is studied based on an experimental modal analysis. The SSEM is used to calculate the damage index from the measured modal parameters and locate the damage position in the blade model successfully. The results indicate that the SSEM based on the modal shapes can be used to detect the damages in complicated beams or beam-like structures for engineering applications. A damage detection method for complicated beam-like structures is proposed based on the subsection strain energy method （SSEM）, and its applicability condition is introduced. For a beam with the continuously varying fiexural stiffness and an edge crack, the SSEM is used to detect the crack location effectively by numerical modal shapes. As a complicated beam, the glass fiber-reinforced composite model of a wind turbine blade is studied based on an experimental modal analysis. The SSEM is used to calculate the damage index from the measured modal parameters and locate the damage position in the blade model successfully. The results indicate that the SSEM based on the modal shapes can be used to detect the damages in complicated beams or beam-like structures for engineering applications.
作者 冯侃 励争 高桂云 苏先樾
机构地区 Department of Mechanics and Aerospace Engineering
出处 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2011年第4期469-478,共10页 应用数学和力学（英文版）
基金 supported by the National Basic Research Program of China (973 Program)(No. 2007CB714603)
关键词 nondestructive testing modal strain energy varying flexural stiffness beam fiber reinforced composite material wind turbine blade nondestructive testing, modal strain energy, varying flexural stiffness beam fiber reinforced composite material, wind turbine blade
分类号 O347 [理学—固体力学]
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参考文献8

  • 1Farrar, C. R. and Doebling, S. W. An overview of modal-based damage identification methods. Proceedings of the DAMAS Conference, Sheffield, UK (1997).
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Applied Mathematics and Mechanics(English Edition)
2011年 第4期

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