DOI QR코드

DOI QR Code

Bayesian in-situ parameter estimation of metallic plates using piezoelectric transducers

  • Asadi, Sina (New Technologies Research Center, Amirkabir University of Technology (Tehran Polytechnic)) ;
  • Shamshirsaz, Mahnaz (New Technologies Research Center, Amirkabir University of Technology (Tehran Polytechnic)) ;
  • Vaghasloo, Younes A. (Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic))
  • 투고 : 2020.02.22
  • 심사 : 2020.09.11
  • 발행 : 2020.12.25

초록

Identification of structure parameters is crucial in Structural Health Monitoring (SHM) context for activities such as model validation, damage assessment and signal processing of structure response. In this paper, guided waves generated by piezoelectric transducers are used for in-situ and non-destructive structural parameter estimation based on Bayesian approach. As Bayesian approach needs iterative process, which is computationally expensive, this paper proposes a method in which an analytical model is selected and developed in order to decrease computational time and complexity of modeling. An experimental set-up is implemented to estimate three target elastic and geometrical parameters: Young's modulus, Poisson ratio and thickness of aluminum and steel plates. Experimental and simulated data are combined in a Bayesian framework for parameter identification. A significant accuracy is achieved regarding estimation of target parameters with maximum error of 8, 11 and 17 percent respectively. Moreover, the limitation of analytical model concerning boundary reflections is addressed and managed experimentally. Pulse excitation is selected as it can excite the structure in a wide frequency range contrary to conventional tone burst excitation. The results show that the proposed non-destructive method can be used in service for estimation of material and geometrical properties of structure in industrial applications.

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참고문헌

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