DAMAGE QUANTIFICATION OF BEAMS USING FREQUENCY SIGNATURE

2017 ◽  
Vol 13 (35) ◽  
Author(s):  
Bryan Josef T. Medrano
Keyword(s):  
Damage Quantification

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.

scholarly journals Fluorescently-labelled CPD and 6-4PP photolyases: new tools for live-cell DNA damage quantification and laser-assisted repair

2019 ◽  
Vol 47 (7) ◽  
pp. 3536-3549 ◽  
Author(s):  
Barbara Steurer ◽  
Yasemin Turkyilmaz ◽  
Marvin van Toorn ◽  
Wessel van Leeuwen ◽  
Paula Escudero-Ferruz ◽  
...  
Keyword(s):  
Dna Damage ◽  
Live Cell ◽  
Damage Quantification

scholarly journals An Efficient Damage Quantification Method for Cylindrical Structures Enhanced by a Dry-Point-Contact Torsional-Wave Transducer

2022 ◽  
Vol 12 (2) ◽  
pp. 572
Author(s):  
Shengbo Shan ◽  
Yongdong Pan ◽  
Shengyu Xiao
Keyword(s):  
Point Contact ◽  
Low Frequency ◽  
Wave Interaction ◽  
Torsional Wave ◽  
Wave Reflections ◽  
Cylindrical Structures ◽  
Quantification Method ◽  
Damage Quantification ◽  
Torsional Waves ◽  
Theoretical Analyses

Quantification of damage sizes in cylindrical structures such as pipes and rods is of paramount importance in various industries. This work proposes an efficient damage quantification method by using a dry-point-contact (DPC) transducer based on the non-dispersive torsional waves in the low-frequency range. Theoretical analyses are first carried out to investigate the torsional wave interaction with different sizes of defects in cylindrical structures. A damage quantification algorithm is designed based on the wave reflections from the defect and end. Capitalizing on multiple excitations at different frequencies, the proposed algorithm constructs a damage image that identifies the geometric parameters of the defects. Numerical simulations are conducted to validate the characteristics of the theoretically-predicted wave-damage interaction analyses as well as the feasibility of the designed damage quantification method. Using the DPC transducer, experiments are efficiently carried out with a simple physical system. The captured responses are first assessed to confirm the capability of the DPC transducer for generating and sensing torsional waves. The sizes of the defects in two representative steel rods are then quantified with the proposed method. Both numerical and experimental results demonstrate the efficacy of the proposed damage quantification method. The understandings of the wave-damage interaction and the concept of the damage quantification algorithm lay out the foundation for engineering applications.

In situ Damage Quantification in Bolts

2004 ◽  
Vol 3 (1) ◽  
pp. 19-31 ◽  
Author(s):  
D. W. Barke ◽  
W. K. Chiu ◽  
S. Fernando
Keyword(s):  
Damage Quantification
Sign in / Sign up

Export Citation Format

Share Document