scholarly journals Finite difference analysis and experimental validation of 3D photonic crystals for structural health monitoring

2017 ◽  
Author(s):  
Valentina Piccolo ◽  
Andrea Chiappini ◽  
Alessandro Vaccari ◽  
Antonino Calà Lesina ◽  
Maurizio Ferrari ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Finite Difference ◽  
Photonic Crystals ◽  
Health Monitoring ◽  
Experimental Validation ◽  
Difference Analysis ◽  
Structural Health ◽  
Finite Difference Analysis

Elasto-Plastic Modeling of Beams for Impedance Based Structural Health Monitoring

2018 ◽  
Author(s):  
Naserodin Sepehry ◽  
Firooz Bakhtiari-Nejad ◽  
Weidong Zhu
Keyword(s):  
Structural Health Monitoring ◽  
Linear System ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Frequency Response ◽  
Health Monitoring ◽  
Difference Method ◽  
Impedance Method ◽  
Structural Health ◽  
System Equations

The structural health monitoring by piezoelectric wafer active sensor (PWAS) using electromechanical impedance method used for monitoring of structure. In present work impedance method of elasto-plastic beam structure is studied. In order to model the effect of a plastic in beam, the moment-curvature relationship for elasto-plastic region for loading and unloading is used. The finite difference method is used to discretize beam with piezoelectric. The piezoelectric actuator is modeled by equivalent moment. Then output current of piezoelectric sensor is calculated. Firstly, elastic modeling of beam is considered that this is leads to linear system equation. In linear system, time domain system equations are calculated and Fourier transform of current output obtained, and then impedance of PWAS in frequency domain is calculated. Secondly, the elasto-plastic of beam is modeled. This phenomenon leads to the nonlinear system equations. These nonlinear equations are solved using finite difference method for any harmonic voltage applied to actuator. Then impedance of PWAS is calculated. Two methods are used to detect elasto-plastic modeling on PWAS impedance. At the first, frequency response of elastic beam as intact model is compared with elasto-plastic results in a desired frequency range. Second, only frequency response of one harmonic is computed with its super-harmonics. Finally, the detection method of linear is compared with nonlinear model.

Optimized Actuator/Sensor Combinations for Structural Health Monitoring: Simulation and Experimental Validation

2015 ◽  
Author(s):  
SRIDARAN VENKAT ◽  
C. BOLLER ◽  
N.B. RAVI ◽  
N. CHAKRABORTY ◽  
G.S. KAMALAKAR ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Experimental Validation ◽  
Structural Health

Design and Experimental Validation of a Structural Health Monitoring Fastener

2007 ◽  
Author(s):  
Alexi Rakow ◽  
Fu-Kuo Chang
Keyword(s):  
Structural Health Monitoring ◽  
Eddy Current ◽  
Health Monitoring ◽  
Experimental Validation ◽  
Early Stage ◽  
Fatigue Cracks ◽  
Flaw Detection ◽  
In Situ Monitoring ◽  
Structural Health ◽  
Current Sensors

In this study a structural health monitoring (SHM) fastener, with built-in eddy current sensors for in-situ monitoring of fatigue cracks at hole locations in layered metallic joints was developed. This presents an optimal method of sensor integration for early stage detection of these cracks, which are among of the most common forms of damage in airframes. Thin, conformable eddy current sensors optimized for in-hole flaw detection [1] and a method of mechanical integration and complete data acquisition and software system are discussed. Results from fatigue tests of single layer and multi-layer specimens are presented in addition to results from bench-top flaw detection tests as a means of experimental validation of the system.

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