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Structural Engineering and Mechanics
  Volume 72, Number 6, December25 2019 , pages 689-712
DOI: https://doi.org/10.12989/.2019.72.6.689
 


Multi constrained optimization combining ARMAX with differential search for damage assessment
Lakshmi K and Rama Mohan Rao A

 
Abstract
    Time-series models like AR-ARX and ARMAX, provide a robust way to capture the dynamic properties of structures, and their residuals can be effectively used as features for damage detection. Even though several research papers discuss the implementation of AR-ARX and ARMAX models for damage diagnosis, they are basically been exploited so far for detecting the time instant of damage and also the spatial location of the damage. However, the inverse problem associated with damage quantification i.e. extent of damage using time series models is not been reported in the literature. In this paper, an approach to detect the extent of damage by combining the ARMAX model by formulating the inverse problem as a multi-constrained optimization problem and solving using a newly developed hybrid adaptive differential search with dynamic interaction is presented. The proposed variant of the differential search technique employs small multiple populations which perform the search independently and exchange the information with the dynamic neighborhood. The adaptive features and local search ability features are built into the algorithm in order to improve the convergence characteristics and also the overall performance of the technique. The multi-constrained optimization formulations of the inverse problem, associated with damage quantification using time series models, attempted here for the first time, can considerably improve the robustness of the search process. Numerical simulation studies have been carried out by considering three numerical examples to demonstrate the effectiveness of the proposed technique in robustly identifying the extent of the damage. Issues related to modeling errors and also measurement noise are also addressed in this paper.
 
Key Words
    Damage assessment, multi constraint optimization, time series analysis, ARMAX model, cepstral distance, Subspace angles, measurement noise
 
Address
CSIR-Structural Engineering Research Centre, Chennai, Tamil Nadu, India
 

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