Modal moment index for damage detection in beam structures

2000 ◽  
Vol 144 (3-4) ◽  
pp. 155-167 ◽  
Author(s):  
D. W. Nicholson ◽  
K. A. Alnefaie
Keyword(s):  
Damage Detection ◽  
Beam Structures ◽  
Moment Index

FEM Free Damage Detection of Beam Structures Using the Deflections Estimated by Modal Flexibility Matrix

2021 ◽  
pp. 2150128
Author(s):  
Wen-Yu He ◽  
Wei-Xin Ren ◽  
Lei Cao ◽  
Quan Wang
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Damage Index ◽  
Element Model ◽  
Mode Shapes ◽  
Beam Structures ◽  
Flexibility Matrix ◽  
Damage Quantification ◽  
Modal Flexibility ◽  
The Cost

The deflection of the beam estimated from modal flexibility matrix (MFM) indirectly is used in structural damage detection due to the fact that deflection is less sensitive to experimental noise than the element in MFM. However, the requirement for mass-normalized mode shapes (MMSs) with a high spatial resolution and the difficulty in damage quantification restricts the practicability of MFM-based deflection damage detection. A damage detection method using the deflections estimated from MFM is proposed for beam structures. The MMSs of beams are identified by using a parked vehicle. The MFM is then formulated to estimate the positive-bending-inspection-load (PBIL) caused deflection. The change of deflection curvature (CDC) is defined as a damage index to localize damage. The relationship between the damage severity and the deflection curvatures is further investigated and a damage quantification approach is proposed accordingly. Numerical and experimental examples indicated that the presented approach can detect damages with adequate accuracy at the cost of limited number of sensors. No finite element model (FEM) is required during the whole detection process.

An experimental study for decentralized damage detection of beam structures using wireless sensor networks

2015 ◽  
Vol 2 (3) ◽  
pp. 237-252 ◽  
Author(s):  
Madhuka Jayawardhana ◽  
Xinqun Zhu ◽  
Ranjith Liyanapathirana ◽  
Upul Gunawardana
Keyword(s):  
Experimental Study ◽  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Damage Detection ◽  
Wireless Sensor ◽  
Beam Structures

Passive Tap‐scan damage detection method for beam structures

2020 ◽  
Vol 27 (4) ◽  
Author(s):  
Zhuyou Hu ◽  
Zhihai Xiang ◽  
Qiuhai Lu
Keyword(s):  
Damage Detection ◽  
Detection Method ◽  
Beam Structures

Damage Detection for Cantilever Beam Structures Using Two-Stage Method

2013 ◽  
Vol 351-352 ◽  
pp. 1084-1087
Author(s):  
Cui Hong Li ◽  
Qiu Wei Yang ◽  
Xue Shen
Keyword(s):  
Damage Detection ◽  
Cantilever Beam ◽  
Measurement Errors ◽  
Damage Identification ◽  
Static Displacement ◽  
Two Stage ◽  
Beam Structures ◽  
Static Test ◽  
Second Stage ◽  
Promising Tool

This paper presents a two-stage method for damage identification in cantilever beam structures using the incomplete measured static and dynamic paramenters. The first stage locates damages preliminary by using the static displacement changes, which is obtained by the static test of structure. It has been shown that the point from which the static displacement difference starts increasing linearly is the location of damage. After the suspected damaged elements are determined in the first stage, the first order sensitivity of the structural natural frequency is used to identify damages more precise in the second stage. The significant advantage of the proposed method is that it is economical in computation and is simple to implement. A cantilever beam structure is analyzed as a numerical example to verify the present method. Results show that the proposed method performs well even if the measurement errors inevitably make the damage assessment more difficult. It has been shown that the presented two-stage methodology may be a promising tool to be used by research groups working on experimental damage detection.

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