Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Effect of noise on output-only structural identification of beams

Document Type : Original Article

Authors
Seyed Rasoul Nabavian 1
Mohammad Reza Davoodi 2
Bahram Navayi Neya 3
Seyed amin Mostafavian 4
1 Structural Engineering, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
3 Associate professor, Civil Engineering Department, Babol Noshirvani University of Technology
4 Department of Civil Engineering, Payame Noor University (PNU), Tehran, Iran
10.22065/jsce.2018.130329.1555
Abstract
Output-only structural identification is conducted by output data of the structure. These data usually include structural response together with some noise. Success of output-only methods in determining the vibration parameters of a structure depends on the signal to noise ratio (SNR) of the output data. In this paper, the vibration parameters (Natural frequency and Mode shape) of a contilever beam have been obtained using output data which have different signal to noise ratios. The vibration parameters of the beam were determined using modal analysis of finite element model and considered as reference parameters. Then, appropriate input was applied to the beam and the acceleration signal was obtained. To generate noisy data, noise with different powers compared to signal powers were added to acceleration signal. The modal parameters of the beam were obtained using two output-only methods, Peak Picking (PP) and Stochastic Subspace Identification (SSI). The vibration parameters having signal-to-noise ratios greater than 25 (lower noise level) for all considered modes were identified properly. At a signal-to-noise ratio of 0.25 to 25 (higher noise level), it was not possible to identify the modal parameters of the first mode of the beam, but the parameters of the higher modes were identified with good accuracy.
Keywords
Structural identification
Output-only method
Contilever beam
Signal to noise ratio Peak picking
Stochastic subspace identification

Subjects

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  • Receive Date 10 May 2018
  • Revise Date 23 July 2018
  • Accept Date 02 October 2018