Optimal Sensor Positioning for Damage Detection in Composite Sensorised Panels

2016 ◽  
Vol 713 ◽  
pp. 191-194 ◽  
Author(s):  
Laure Sainfort ◽  
Zahra Sharif Khodaei ◽  
M.H. Ferri Aliabadi
Keyword(s):  
Damage Detection ◽  
Ray Tracing ◽  
Lamb Waves ◽  
Damage Index ◽  
Optimization Methods ◽  
Composite Panel ◽  
Index Method ◽  
Average Probability ◽  
Detection And Localization ◽  
Optimal Configurations

In this work the optimal configuration of transducers for damage detection and localization has been investigated. A particular interest is given to three optimization methods: mini-max, average Probability of Non Detection (POND) and ray tracing approach, coupled with genetic algorithm. After optimal configurations have been computed for each technique, they are experimentally tested and compared on a composite panel with one or two damages by generating and receiving Lamb waves signals. Damage detection is carried out with the Probability Based Damage Index Method (PBDIM). It was found that, in most cases, the ray tracing method and the average POND technique give better results, with a good detection of damages in comparison to the minimax POND technique, even if the latter seems numerically better.

Guided Lamb Wave Interrogation of a Curved Composite Plate [0/90] Using the Hilbert-Huang Transform Approach

2008 ◽  
Author(s):  
Byungseok Yoo ◽  
Darryll Pines ◽  
Ashish S. Purekar
Keyword(s):  
Structural Damage ◽  
Lamb Waves ◽  
Damage Index ◽  
Composite Panel ◽  
Progressive Damage ◽  
Damage Growth ◽  
Monitoring Tool ◽  
Hilbert Huang Transform ◽  
Mode Decomposition ◽  
Torque Load

This paper discusses a study of the Hilbert-Huang transform approach as a structural health monitoring tool for a curved composite panel with a [90/0/0/90]sym lay-up sequence. The Hilbert amplitude, phase, and frequency coupled with empirical mode decomposition (EMD) process are defined as the Hilbert-Huang transform (HHT) and used to evaluate structural damage in the curved composite panel as the level of damage increases. Piezoelectric (PZT) sheets are used as an actuator and receivers, akin to the pitch-catch method to excite the guided Lamb waves and to obtain the vibratory response of the curved composite panel. In this paper, a new damage metric using the Hilbert-Huang transformed energy and amplitude in conjunction with the Hilbert-Huang transformed phase are proposed and investigated as a new structural damage index. Results show that these damage metrics are capable of tracking progressive damage growth in the form of loss of torque load.

Диагностика ударных повреждений монолитных и сотовых углепластиков с помощью ультразвуковых волн Лэмба

2021 ◽  
pp. 33-43
Author(s):  
М.В. Бурков ◽  
А.В. Еремин ◽  
А.В. Бяков ◽  
П.С. Любутин ◽  
С.В. Панин
Keyword(s):  
Damage Detection ◽  
Impact Energy ◽  
Cross Correlation ◽  
Lamb Waves ◽  
Impact Damage ◽  
Damage Index ◽  
The Other ◽  
State Testing ◽  
Accurate Data ◽  
Damage Location

The paper presents the results on Lamb waves based technique for impact damage detection and severity identification. The PZT network operates in the round-robin mode changing the actuator and sensor roles of the transducers in order to detect the response of the system in the presence of damage. The monitoring is performed via the analysis of three parameters: change of the amplitude (dA), change of the energy (dP) and cross-correlation (NCC) of the signals in baseline and damaged state. Testing of laminate CFRPs shows that the damage location is estimated within the 5–15 mm error, while the computed Damage index linearly is dependent on the applied impact energy. For honeycomb CFRPs the NCC parameter do not provide accurate results, however, the other parameters allow identification within the 5–20 mm error and reflect accurate data on the severity of the damage.

scholarly journals Impact Damage Detection in Laminate and Honeycomb CFRPs using Lamb Wave Ultrasonic Sensing

2021 ◽  
Vol 57 (2) ◽  
pp. 114-124
Author(s):  
M. V. Burkov ◽  
A. V Eremin ◽  
A. V. Byakov ◽  
P. S. Lyubutin ◽  
S. V. Panin
Keyword(s):  
Damage Detection ◽  
Impact Energy ◽  
Cross Correlation ◽  
Lamb Waves ◽  
Impact Damage ◽  
Damage Index ◽  
State Testing ◽  
Accurate Data ◽  
Damage Location ◽  
Ultrasonic Sensing

Abstract The paper presents the results on application of Lamb waves based technique for impact damage detection and severity identification. The PZT network operates in the round-robin mode changing the actuator and sensor roles of the transducers in order to detect the response of the system in the presence of damage. The monitoring is performed via the analysis of three parameters: change of the amplitude (dA), change of the energy (dP) and cross-correlation (NCC) of the signals in baseline and damaged state. Testing of laminate CFRPs shows that the damage location is estimated with an error of 5–15 mm, while the computed Damage index is linearly dependent on the applied impact energy. For honeycomb CFRPs the NCC parameter do not provide accurate results, however, other parameters allow identification within the 5–20 mm error and reflect accurate data on the severity of the damage.

Damage Detection in Thick Steel Beam Using Lamb Waves

2008 ◽  
Author(s):  
Kai Sun ◽  
Guang Meng ◽  
Fucai Li ◽  
Lin Ye ◽  
Ye Lu
Keyword(s):  
Damage Detection ◽  
Lamb Wave ◽  
Lamb Waves ◽  
Fem Simulation ◽  
Wave Mode ◽  
Thin Plates ◽  
Steel Beams ◽  
Thick Steel ◽  
Number Of Cycles ◽  
Detection And Localization

Different from the mostly concerned Lamb wave-based damage detection for thin plates, this paper presents a diagnosis procedure on thick steel beams with thickness of 34 mm. The diagnosis strategy and specimens were first described, and some parameters, such as the frequency and the number of cycles of the diagnostic waveform, were discussed. Based on finite element method (FEM) simulation, the experiment configuration was addressed, results from which show good similarity between the outcomes from the simulations and those from the experiments. Wavelet transform was further used to process the acquired Lamb wave signals for the purpose of damage detection and localization. Meanwhile, the velocity of the Lamb waves was calculated, illustrating that the fundamental anti-symmetric (A0) Lamb wave mode was excited in this case. The results demonstrate that Lamb waves can also be applied to some thick structures for the purpose of structural health monitoring.

Investigations of Vibration Based Condition Assessment of Timber Beams Strengthened with Fiber Reinforced Polymer

2013 ◽  
Vol 831 ◽  
pp. 53-57
Author(s):  
Run Hua Xiao ◽  
Jian Chun Li ◽  
Ri Jun Shrestha
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Damage Index ◽  
Fiber Reinforced Polymer ◽  
Research Trend ◽  
Experimental Program ◽  
Fiber Reinforced ◽  
Index Method ◽  
Reinforced Polymer ◽  
Timber Beams

In recent years, research trend on structural condition assessments have largely shifted toward utilizing vibration based methods for structural damage detection and evaluation. On the other hand, research and applications on use of fiber reinforce polymer (FRP) on timber for strengthening or repair damaged timber members in various types of timber structures has also become increasingly popular. Although the application of FRP for repair and/or strengthening of structures has been researched for a long time, research on non-destructive assessment or evaluation of the effectiveness and reliability after FRP repairing or strengthening is yet to be carried out. In this paper, the authors made an attempt on investigation of such issue utilizing Damage Index method, which is a robust vibration-based approach for damage detection. The investigation was aiming at localizing and quantifying damage in timber beams and, more importantly evaluating the effectiveness after the damage was repaired. An experimental program was carried out on five laminated veneer lumber (LVL) beams. Various damage scenarios (i.e. severe, medium, light damage) are introduced on these beams and then repaired with carbon fiber reinforced polymer (CFRP). Experimental results indicate that the use of CFRP was effective in repairing the damaged timber beams. Utilizing Damage Index method can accurately detect the damage location. However, the investigation also shows that direct application of the Damage Index for evaluation of the effectiveness of rehabilitation of the damaged timber beam is not satisfactory. Further investigation and modification of the Damage Index method will be carried out in next stage research.

scholarly journals Damage Detection and Localization on Real Structures Subjected to Strong Motion Earthquakes Using the Curvature Evolution Method: The Navelli (Italy) Case Study

2021 ◽  
Vol 11 (14) ◽  
pp. 6496
Author(s):  
Rocco Ditommaso ◽  
Chiara Iacovino ◽  
Gianluca Auletta ◽  
Stefano Parolai ◽  
Felice Carlo Ponzo
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Evaluation Method ◽  
Empirical Relationship ◽  
Computing Time ◽  
Damage Index ◽  
Strong Motion ◽  
Critical Event ◽  
Curvature Variation ◽  
Detection And Localization

In recent years, structural health monitoring (SHM) has received increasing interest from both research and professional engineering communities. This is due to the limitations related to the use of traditional methods based on visual inspection for a rapid and effective assessment of structures and infrastructures when compared with the great potential offered by newly developed automatic systems. Most of these kinds of systems allow the continuous estimation of structural modal properties that are strictly correlated to the mechanical characteristics of the monitored structure. These can change as a result of material deterioration and structural damage related to earthquake shaking. Furthermore, a suitable configuration of a dense sensor network in a real-time monitoring system can allow to detect and localize structural and non-structural damage by comparing the initial and a final state of the structure after a critical event, such as a relevant earthquake. In this paper, the modal curvature evaluation method, used for damage detection and localization on framed structures, considering the mode curvature variation due to strong earthquake shaking, is further developed. The modified approach is validated by numerical and experimental case studies. The extended procedure, named “Curvature Evolution Method” (CEM), reduces the required computing time and the uncertainties in the results. Furthermore, in this work, an empirical relationship between curvature variation and damage index has been defined for both bare and infilled frames.

scholarly journals Mode Shape-Based Damage Detection Method (MSDI): Experimental Validation

2021 ◽  
Vol 11 (10) ◽  
pp. 4589
Author(s):  
Ivan Duvnjak ◽  
Domagoj Damjanović ◽  
Marko Bartolac ◽  
Ana Skender
Keyword(s):  
Boundary Conditions ◽  
Damage Detection ◽  
Mode Shape ◽  
Experimental Validation ◽  
Detection Method ◽  
Dynamic Properties ◽  
Damage Index ◽  
Main Principle ◽  
The Difference ◽  
Different Levels

The main principle of vibration-based damage detection in structures is to interpret the changes in dynamic properties of the structure as indicators of damage. In this study, the mode shape damage index (MSDI) method was used to identify discrete damages in plate-like structures. This damage index is based on the difference between modified modal displacements in the undamaged and damaged state of the structure. In order to assess the advantages and limitations of the proposed algorithm, we performed experimental modal analysis on a reinforced concrete (RC) plate under 10 different damage cases. The MSDI values were calculated through considering single and/or multiple damage locations, different levels of damage, and boundary conditions. The experimental results confirmed that the MSDI method can be used to detect the existence of damage, identify single and/or multiple damage locations, and estimate damage severity in the case of single discrete damage.

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