Structure damage detection method-based on modal strain energy

In order to identify structural damage locations and extent, a method based on ridge estimation and modal strain energy is presented in this paper. First, structural modal strain energy is given and a modal strain energy sensitivity damage equation is obtained. Then, considering the TikhonovTT regularization theoryTT, a ridge estimation method is proposed to solve the damage equation and ridge parameter of the method is optimized. Simulation results demonstrate that the proposed damage detection method based on ridge estimation and modal strain energy can identify structural damage locations and extent with good accuracy.

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Damage Detection Method for Composite Structures Based on a Combined Technique of Cross Modal Strain Energy and Niche Genetic Algorithms

Journal of Vibration and Control ◽

10.1177/1077546309104879 ◽

2010 ◽

Vol 16 (11) ◽

pp. 1673-1683 ◽

Cited By ~ 6

Author(s):

Y.J. Yan ◽

H.F. Yang ◽

Z.Y. Wu ◽

X. Ge

Keyword(s):

Genetic Algorithms ◽

Damage Detection ◽

Composite Structures ◽

Strain Energy ◽

Detection Method ◽

Modal Strain Energy ◽

Niche Genetic Algorithms ◽

Combined Technique

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A Damage Detection Method: CMSE Combined with Niche GA

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.929 ◽

2007 ◽

Vol 334-335 ◽

pp. 929-932 ◽

Cited By ~ 2

Author(s):

Xu Ge ◽

Yun Ju Yan ◽

Huan Guo Chen

Keyword(s):

Composite Material ◽

Damage Detection ◽

Composite Structures ◽

Structural Damage ◽

Strain Energy ◽

Detection Method ◽

Detection Methods ◽

Damage Localization ◽

Complex Structures ◽

Modal Strain Energy

The paper presents an effective damage detection method of complex composite structures. It can be carried out through the experimental modal analysis of the damaged structure. The method using the improved Cross Modal Strain Energy (CMSE) technique and Niche GA has many advantages compared with other damage detection methods. The CMSE method can use any modes of the structure and the modes don’t need to be normalized or consistent in scale. The Niche GA improves the efficiency of the calculation and enhances the capacity of identifying structural damage localization. The model is the composite material airfoil case. The numerical results show that the method proposed in this paper is successful for damage detection of complex structures.

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Composite Skin/Stringer Panel Damage Detection Based on Modal Strain Energy and Neural Network Technique

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.322 ◽

2011 ◽

Vol 66-68 ◽

pp. 322-327 ◽

Cited By ~ 3

Author(s):

Jia Hui ◽

Xiao Peng Wan ◽

Mei Ying Zhao

Keyword(s):

Neural Network ◽

Numerical Simulation ◽

Damage Detection ◽

Strain Energy ◽

Modal Strain Energy ◽

Structure Damage ◽

Damage Indicator ◽

Material Stiffness ◽

Stiffness Properties

This paper proposed a new method to detect the damage of composite skin/stringer panel structure using modal strain energy combined with neural network. The change ratio of element modal strain energy is choosen as damage indicator because of it’s highly sensitivity to the location and severity of structure damage. Neural network here play the role of a tool to indentity the damage according to the change ratio of modal strain energy. To achive this, a three layers neural network model is built and the BP arithmetic is used. The proposed method is validated using a numerical simulation of a composite skin/stringer panel with damages in some elements of its FEM mode, which are simulated by reducing elements’ material stiffness properties. The result shows that, this method is robust, accurate and highly efficient with the maximal error limited in 10%.

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Structural Damage Detection Based on Strain Energy and Evidence Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.48-49.1122 ◽

2011 ◽

Vol 48-49 ◽

pp. 1122-1125 ◽

Cited By ~ 5

Author(s):

Hui Yong Guo ◽

Zheng Liang Li

Keyword(s):

Damage Detection ◽

Structural Damage ◽

Strain Energy ◽

Energy Equation ◽

Damage Identification ◽

Detection Method ◽

Evidence Theory ◽

Modal Strain Energy ◽

New Energy ◽

Damage Extent

In order to solve the damage detection problem, a damage detection method based on strain energy and evidence theory is presented in this paper. First, an evidence theory method is proposed to identify structural damage locations. Then, structural modal strain energy is utilized to quantify structural damage extents. In general, structural strain energy dissipation should be equal to the change of modal strain energy, according to this theory, a new energy equation is deduced, and structural damage extent can be obtained through the solution of the equation. The simulation results show that the method can perfectly identify damage locations and extents. Therefore, the proposed method is effective for the structural damage identification.

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