Cross Modal Strain Energy Method for Damage Localization and Severity Estimation

2007 ◽  
Author(s):  
Shuqing Wang ◽  
Huajun Li ◽  
Sau-Lon James Hu
Keyword(s):  
Strain Energy ◽  
Numerical Study ◽  
Element Model ◽  
Damage Localization ◽  
Modal Strain Energy ◽  
Damage Diagnosis ◽  
Damage Scenarios ◽  
Severity Estimation ◽  
Modal Strain Energy Method ◽  
Diagnosis Method

A cross modal strain energy (CMSE) damage diagnosis method, which is capable of localizing the damages and estimating their severities, is presented. The numerical study uses measurements synthesized from a finite element model of a laboratory-scaled offshore platform. Several damage scenarios are investigated, including: single/double damaged element(s), with/without measurement noise. Numerical results suggest that good performance on both damage location and severity assessment can be achieved by implementing the CMSE method.

Cross Modal Strain Energy Method for Damage Detection Using Limited Modal Data

2013 ◽  
Vol 284-287 ◽  
pp. 1285-1289 ◽  
Author(s):  
Shu Qing Wang ◽  
Min Zhang ◽  
Fu Shun Liu
Keyword(s):  
Iterative Process ◽  
Strain Energy ◽  
Numerical Study ◽  
Damage Localization ◽  
Modal Strain Energy ◽  
Modal Data ◽  
Severity Estimation ◽  
Modal Strain Energy Method ◽  
Numerical Result ◽  
Strain Energy Method

This paper extends the recently developed cross modal strain energy (CMSE) method for damage localization and severity estimation, using limited modal data, with iterative process. For investigating the performance and verifying the effectiveness of the present CMSE method, the numerical study of this article chooses a damaged beam that was investigated in a published article. The numerical result indicates that the CMSE method is capable of detecting the damage locations and estimating their severities properly, even when only few spatially incomplete, noisy modes are utilized.

scholarly journals Damage localization and quantification in the Catwalk of Foroozan offshore complex using improved modal strain energy method

2021 ◽  
Vol 5 (2) ◽  
pp. 11-21
Author(s):  
Mehdi Alavinezhad ◽  
Madjid Ghodsi Hassanabad ◽  
Mohammad Javad Ketabdari ◽  
Masood Nekooei ◽  
◽  
...  
Keyword(s):  
Energy Method ◽  
Strain Energy ◽  
Damage Localization ◽  
Modal Strain Energy ◽  
Modal Strain Energy Method ◽  
Strain Energy Method

Infrastructure Sustainability

2011 ◽  
pp. 186-201
Author(s):  
Hoi Wai Shih ◽  
David Thambiratnam ◽  
Tommy Chan
Keyword(s):  
Energy Method ◽  
Strain Energy ◽  
Health State ◽  
Modal Strain Energy ◽  
Structural Health ◽  
Modal Strain Energy Method ◽  
Modal Flexibility ◽  
Before And After ◽  
Composite Bridges ◽  
Strain Energy Method

Assessing the structural health state of urban infrastructure is crucial in terms of infrastructure sustainability. This chapter uses dynamic computer simulation techniques to apply a procedure using vibration-based methods for damage assessment in multiple-girder composite bridges. In addition to changes in natural frequencies, this multi-criteria procedure incorporates two methods, namely, the modal flexibility and the modal strain energy method. Using the numerically simulated modal data obtained through finite element analysis software, algorithms based on modal flexibility and modal strain energy change, before and after damage, are obtained and used as the indices for the assessment of structural health state. The feasibility and capability of the approach is demonstrated through numerical studies of a proposed structure with six damage scenarios. It is concluded that the modal strain energy method is capable of application to multiple-girder composite bridges, as evidenced through the example treated in this chapter.

Influence of Sandwich Damping on the Loss Factor of Multi-Plies Bellows

2010 ◽  
Vol 44-47 ◽  
pp. 2998-3002 ◽  
Author(s):  
Wei Ma ◽  
Yong Chao Lu ◽  
Yong Gang Liu ◽  
Ji Shun Li ◽  
Yu Jun Xue
Keyword(s):  
Finite Element ◽  
Loss Factor ◽  
Strain Energy ◽  
Vibration Isolation ◽  
Mechanical Performance ◽  
Finite Element Models ◽  
Modal Strain Energy ◽  
Modal Strain Energy Method ◽  
Thin Walled ◽  
Strain Energy Method

Multi-plies bellows is a kind of cylindrical thin-walled container with curved shape. It is effective in seal, energy storage and vibration isolation. In the paper, the modal loss factor of multi-plies bellows was analyzed based on the modal strain energy method. Then the finite element models of multi-piles bellows were given by ANSYS. The mechanical performance of bellows was analyzed in detail. The strain energy distribution of multi-plies bellows and viscoelsticity layer were given. According to the strain energy, the influence of sandwich damping on the loss factor was studied. The results show that the loss factor can be improved by employing the sandwich damping with big thickness and elastic modulus 200MPa.

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