Substructural damage detection in shear structures via ARMAX model and optimal subpattern assignment distance

2019 ◽  
Vol 191 ◽  
pp. 625-639 ◽  
Author(s):  
Liu Mei ◽  
Huaguan Li ◽  
Yunlai Zhou ◽  
Weilun Wang ◽  
Feng Xing
Keyword(s):  
Damage Detection ◽  
Shear Structures ◽  
Armax Model

scholarly journals Damage Location Index of Shear Structures Based on Changes in First Two Natural Frequencies

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hien HoThu ◽  
Akira Mita
Keyword(s):  
System Identification ◽  
Damage Detection ◽  
Natural Frequencies ◽  
Detection Method ◽  
Identification Methods ◽  
Damage Location ◽  
Shear Structures ◽  
Stiffness Reduction ◽  
Shear Building

A method of detecting the location of damage in shear structures by using only the changes in first two natural frequencies of the translational modes is proposed. This damage detection method can determine the damage location in a shear building by using a Damage Location Index (DLI) based on two natural frequencies for undamaged and damaged states. In this study, damage is assumed to be represented by the reduction in stiffness. This stiffness reduction results in a change in natural frequencies. The uncertainty associated with system identification methods for obtaining natural frequencies is also carefully considered. Some simulations and experiments on shear structures were conducted to verify the performance of the proposed method.

scholarly journals Real-time fast damage detection of shear structures with random base excitation

Measurement ◽  
2015 ◽  
Vol 74 ◽  
pp. 92-102 ◽  
Author(s):  
Yonghui An ◽  
Billie F. Spencer ◽  
Jinping Ou
Keyword(s):  
Damage Detection ◽  
Real Time ◽  
Base Excitation ◽  
Shear Structures

A New Algorithm for the System Identification of Shear Structures

2012 ◽  
Vol 457-458 ◽  
pp. 495-499 ◽  
Author(s):  
Behnam Adhami ◽  
Hamed Niroumand ◽  
Karen Khanlari
Keyword(s):  
System Identification ◽  
Damage Detection ◽  
Frequency Characteristics ◽  
Mode Shapes ◽  
Noise Attenuation ◽  
Structural System ◽  
Coulomb Damping ◽  
Shear Structures ◽  
General Terms ◽  
Shear Structure

In general terms, the aim of "System Identification" is to determine the dynamic characteristics of mechanical systems. These characteristics include both frequency characteristics (frequencies, mode shapes, and damping ratios) and the system's characteristic matrices (the matrices of mass, viscous damping, stiffness, Coulomb damping or coefficients of friction, and the Duffing stiffness). In such fields as "Damage Detection" in structures, identification of the system's characteristic matrices is of the same importance as the identification of the frequency characteristics, or even more so, by identifying these matrices, the intended goals in Damage Detection can be achieved. In line with such identification, a new algorithm for the system identification of shear structures is presented in the paper. Taking into account the fundamental and significant effect of noise attenuation in boosting the levels of precision and the correctness of system identification, this method helps to achieve noise attenuation by trimming noisy records in the frequency domain, in parallel with the identification of the structural system. The efficiency and precision of the method have been examined through the application of a "closed loop solution" to a five storey model of shear structure.

scholarly journals Damage Location and Quantification Indices of Shear Structures Based on Changes in the First Two or Three Natural Frequencies

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Hien HoThu ◽  
Akira Mita
Keyword(s):  
Damage Detection ◽  
Natural Frequencies ◽  
Effective Means ◽  
Cost Effective ◽  
Identification Methods ◽  
Detection Algorithms ◽  
Damage Location ◽  
Shear Structures ◽  
Stiffness Reduction ◽  
Damage Quantification

This study proposes damage detection algorithms for multistory shear structures that only need the first two or three natural frequencies. The methods are able to determine the location and severity of damage on the basis of damage location indices (DLI) and damage quantification indices (DQI) consisting of the changes in the first few squared natural frequencies of the undamaged and damaged states. The damage is assumed to be represented by a reduction in stiffness. This stiffness reduction causes a shift in the natural frequencies of the structure. The uncertainty associated with system identification methods for obtaining natural frequencies is also carefully considered. The methods are accurate and cost-effective means only requiring the changes in the natural frequencies.

Antioptimization for comparison of alternative structural models and damage detection

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 857-864
Author(s):  
S. N. Gangadharan ◽  
E. Nikolaidis ◽  
K. Lee ◽  
R. T. Haftka ◽  
R. Burdisso
Keyword(s):  
Damage Detection ◽  
Structural Models
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