TY - JOUR
T1 - A compact self-adaptive recursive least square approach for real-time structural identification with unknown inputs
AU - Askari, Mohsen
AU - Li, Jianchun
AU - Samali, Bijan
PY - 2016
Y1 - 2016
N2 - A new online tracking technique, based on recursive least square with adaptive multiple forgetting factors, is presented in this article which can estimate abrupt changes in structural parameters during excitation and also identify the unknown inputs to the structure, for example, earthquake signal. The method considers an adaptive rule for each of the forgetting factors assigned to each of the unknown parameters and thus enables simultaneous identification of different time-varying parameters of the system. The method is validated through both linear and nonlinear case studies, with different excitations and damage scenarios. The results show that the proposed algorithm can effectively identify the time-varying parameters such as damping, stiffness as well as unknown excitations with high computational efficiency, even when the measured data are contaminated with different levels of noise. However, when damage occurs while the excitation is small, the identification error remains at a small range, and therefore, covariance cannot be amplified to effectively track the changes in unknown parameters.
AB - A new online tracking technique, based on recursive least square with adaptive multiple forgetting factors, is presented in this article which can estimate abrupt changes in structural parameters during excitation and also identify the unknown inputs to the structure, for example, earthquake signal. The method considers an adaptive rule for each of the forgetting factors assigned to each of the unknown parameters and thus enables simultaneous identification of different time-varying parameters of the system. The method is validated through both linear and nonlinear case studies, with different excitations and damage scenarios. The results show that the proposed algorithm can effectively identify the time-varying parameters such as damping, stiffness as well as unknown excitations with high computational efficiency, even when the measured data are contaminated with different levels of noise. However, when damage occurs while the excitation is small, the identification error remains at a small range, and therefore, covariance cannot be amplified to effectively track the changes in unknown parameters.
KW - least squares
KW - recursive functions
KW - structural health monitoring
KW - system identification
UR - http://handle.uws.edu.au:8081/1959.7/uws:34596
UR - http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=116343416&site=ehost-live&scope=site
U2 - 10.1177/1369433216634480
DO - 10.1177/1369433216634480
M3 - Article
SN - 1369-4332
VL - 19
SP - 1118
EP - 1129
JO - Advances in Structural Engineering
JF - Advances in Structural Engineering
IS - 7
ER -