Location sensitivity of fundamental and higher mode shapes in localization of damage within a building

Ghosh, Gourab; Ray-Chaudhuri, Samit

doi:10.1016/j.jsv.2015.12.005

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…e change in natural frequency varies directly with the square root of the change in stiffness and inversely with the square root of the change in mass. e same changes in natural frequency are produced by a change in stiffness or mass [37,38]. Both stiffness and mass perturbation modify the modal parameters of the structures.…”

Section: Objective Function For Selecting the Mass Perturbationmentioning

confidence: 99%

Mass‐Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Zhang

Xia

Galant

et al. 2019

Shock and Vibration

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Identification of the mode shapes through monitoring is one of the key problems in damage diagnosis based on modal parameters especially for damaged structures. In order to obtain mode shapes of damaged structures easily and accurately, the mass-stiffness combined perturbation (MSCP) method is proposed in this paper. To do so, the relationship between the stiffness perturbation mode shapes of damaged and intact structures is firstly derived and established. Then, the principle of similar frequency is applied to optimize the objective function of the most suitable mass perturbation model. Both numerical analyses and experimental tests on simple and complex structures demonstrate that the proposed MSCP method achieves higher precision than traditional mode shape identification methods. The additional advantages of the MSCP method include (i) lower requirement on the frequency analysis of only damaged structures and (ii) higher effectiveness for minor damage scenarios. In fact, the lower the damage, the higher the precision achieved by the MSCP method. As illustrated in the paper, the proposed technique has excellent applications in mode shapes identification and structural health monitoring.

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Section: Objective Function For Selecting the Mass Perturbationmentioning

confidence: 99%

Mass‐Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Zhang

Xia

Galant

et al. 2019

Shock and Vibration

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“…The statistical features of time-history responses can be used to define damage indicators [29]. In the frequency domain, mode shapes and modal curvatures are early used for model-free damage location purpose [15,30]. Damage locations are estimated by comparing the mode shape vectors or modal curvatures of a structure before and after damage.…”

Section: Introductionmentioning

confidence: 99%

Model-free damage localization of structures using wavelet based grey relational analysis

Fang¹,

Chen²

2020

Smart Mater. Struct.

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Damage detection of real-life civil structures is generally performed under a condition of poor information, mainly referring to our insufficient knowledge of structures, uncertainties and limited sensors. Moreover, most damage detection methods require the numerical or mathematical models of a structure, whose stiffness parameters are sought by inverse solutions such as model updating. However, ill-conditioning problems are often found when updating complex structures. Hence, a model-free damage localization strategy has been proposed incorporating wavelet packet transform with grey relation analysis. First acceleration response signals are decomposed into different frequency subbands using wavelet packet transform. The wavelet packet energies of specific frequency subbands corresponding to fundamental modal frequencies are extracted and then normalized by the total energy of all the accelerometers. After that, wavelet packet energy curvatures are constructed and incorporated with grey relation analysis to propose a wavelet grey correlation coefficient. Damage locations are determined according to magnitude changes in these coefficients. Lastly, the feasibility of the proposed method has been successfully verified against an experimental steel beam. The validation also found that direct damage localization based on mode shapes or modal curvatures could not provide effective judgment.

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Modal sensitivity analysis of acoustic metamaterials for structural damage detection

Huang

2023

International Journal of Mechanical Sciences

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Location sensitivity of fundamental and higher mode shapes in localization of damage within a building

Cited by 6 publications

References 23 publications

Mass‐Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Mass‐Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Model-free damage localization of structures using wavelet based grey relational analysis

Modal sensitivity analysis of acoustic metamaterials for structural damage detection

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