Structural Engineering and Mechanics

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Simultaneous identification of stiffness and damping based on derivatives of eigen-parameters

  • Lia, H. (Department of Applied Mechanics and Engineering, Sun Yat-sen University) ;
  • Liu, J.K. (Department of Applied Mechanics and Engineering, Sun Yat-sen University) ;
  • Lu, Z.R. (Department of Applied Mechanics and Engineering, Sun Yat-sen University)
  • Received : 2015.01.12
  • Accepted : 2015.05.15
  • Published : 2015.08.25
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Abstract

A method based on derivatives of eigen-parameters is presented for damage detection in discrete systems with dampers. The damage is simulated by decrease on the stiffness coefficient and increase of the damping coefficient. In the forward analysis, the derivatives of eigen-parameters are derived for the discrete system. In the inverse analysis, a derivative of eigen-parameters based model updating approach is used to identify damages in frequency domain. Two numerical examples are investigated to illustrate efficiency and accuracy of the proposed method. Studies in this paper indicate that the proposed method is efficient and robust for both single and multiple damages and is insensitive to measurement noise. And satisfactory identified results can be obtained from few numbers of iterations.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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