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Applied Mathematics and Mechanics (English Edition) ›› 2011, Vol. 32 ›› Issue (4): 469-478.doi: https://doi.org/10.1007/s10483-011-1431-x

• Articles • 上一篇    下一篇

Damage detection method in complicated beams with varying flexural stiffness

冯侃 励争 高桂云 苏先越   

  1. Department of Mechanics and Aerospace Engineering, State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
  • 收稿日期:2011-01-25 修回日期:2011-02-21 出版日期:2011-03-29 发布日期:2011-04-01

Damage detection method in complicated beams with varying flexural stiffness

FENG Kan, LI Zheng, GAO Gui-Yun, SU Xian-Yue   

  1. Department of Mechanics and Aerospace Engineering, State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2011-01-25 Revised:2011-02-21 Online:2011-03-29 Published:2011-04-01

PDF

955

被引次数

12

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 flexural 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.

Abstract: 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 flexural 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.

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