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Sensor placement optimization for structural modal identification of flexible structures using genetic algorithm

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Abstract

The position of vibration sensors influences the modal identification quality of flexible structures for a given number of sensors, and the quality of modal identification is usually estimated in terms of correlation between the natural modes using the modal assurance criterion (MAC). The sensor placement optimization is characterized by the fact that the design variables are not continuous but discrete, implying that the conventional sensitivity-driven optimization methods are not applicable. In this context, this paper presents the application of genetic algorithm to the sensor placement optimization for improving the modal identification quality of flexible structures. A discrete-type optimization problem using genetic algorithm is formulated by defining the sensor positions and the MAC as the design variables and the objective function, respectively. The proposed GA-based evolutionary optimization method is validated through the numerical experiment with a rectangular plate, and its excellence is verified from the comparison with the cases using different modal correlation measures.

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea

    B. K. Jung, J. R. Cho & W. B. Jeong

Authors
  1. B. K. Jung
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  2. J. R. Cho
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  3. W. B. Jeong
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Corresponding author

Correspondence to W. B. Jeong.

Additional information

Recommended by Editor Yeon June Kang

Byung Kyoo Jung received the B.S. and M.S. from Pusan National University in 2010 and 2012. He is a Ph.D. student at the School of Mechanical Engineering in Pusan National University. His research interests are in the area of finite/boundary element analysis of noise and vibration and fluidstructure interactions.

Jinrae Cho received the B.S. in Aeronauticla Engineering from Seoul National University in 1983, and M.S. and Ph.D. from the University of Texas at Austin in 1993 and 1995, respectively. He is currently a vice director of the Research and Development Institute of MidasIT, a worldwide FEM software developing and engineering company.

Weui Bong Jeong received the B.S. and M.S. from Seoul National University in 1978 and from KAIST in 1980, respectively, and Ph.D. from Tokyo Institute of Technology in 1990. Dr. Jeong is currently a professor at the department of mechanical engineering at Pusan National University in Busan, Korea.

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Jung, B.K., Cho, J.R. & Jeong, W.B. Sensor placement optimization for structural modal identification of flexible structures using genetic algorithm. J Mech Sci Technol 29, 2775–2783 (2015). https://doi.org/10.1007/s12206-015-0606-z

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  • DOI: https://doi.org/10.1007/s12206-015-0606-z

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