Structural nonlinear damage detection using improved Dempster-Shafer theory and time domain model
Huiyong Guo1 , Rong Zhou2 , Feng Zhang3
1, 2, 3School of Civil Engineering, Chongqing University, Chongqing, 400045, P. R. China
1, 2, 3Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing, 400045, China
Journal of Vibroengineering, Vol. 21, Issue 6, 2019, p. 1679-1693.
Received 14 June 2019; received in revised form 6 September 2019; accepted 16 September 2019; published 30 September 2019
In the service period, a crack may appear in some engineering structures. The development of accurate and effective methods for crack damage detection has become a topic of great importance. In this paper, a nonlinear damage detection method based on the improved Dempster-Shafer (D-S) theory and time domain model is presented. First, acceleration responses in the undamaged and damaged states are measured by using accelerometers. Then, acceleration responses are utilized to establish an autoregressive (AR) model, and residual time series of acceleration responses are used to establish an autoregressive conditional heteroskedasticity (ARCH) model. A cepstral metric conversion (CMC) method based on the AR model is employed to obtain local damage solution and an autoregressive conditional heteroskedasticity conversion (ARCHC) method based on ARCH model is presented to acquire another local damage solution. Finally, the D-S theory is applied to detect damages by integrating these local damage solutions, and an improved D-S theory is further presented to enhance the detection accuracy. The numerical and experimental examples show that the improved D-S theory has high detection accuracy and good performance.
- An efficient method based on Dempster-Shafer theory and time domain model is proposed to detect crack damage.
- A cepstral metric conversion method based on the AR model is employed to obtain local damage solution.
- An autoregressive conditional heteroskedasticity conversion method based on ARCH model is presented to acquire another local damage solution.
- An improved probability quantity method based on different importance is presented to enhance the detection accuracy of the D-S theory.
Keywords: damage detection, Dempster-Shafer theory, time domain model, nonlinearity, acceleration response.
This work was supported by the National Natural Science Foundation of China (Grant No. 51578094).
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