Damage detection method in complicated beams with varying flexural stiffness  

作　　者：冯侃 励争 高桂云 苏先樾 

机构地区：[1]Department of Mechanics and Aerospace Engineering,State Key Laboratory for Turbulence and Complex Systems,College of Engineering,Peking University

出　　处：《Applied Mathematics and Mechanics(English Edition)》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)

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.

关 键 词：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]