Journal ArticleDOI
Genetic algorithm based reconstruction of the elastic moduli of orthotropic plates using an ultrasonic guided wave single-transmitter-multiple-receiver SHM array
TLDR
In this article, a single-transmitter-multiple-receiver (STMR) compact structural health monitoring (SHM) array is used to reconstruct the elastic moduli of orthotropic plate structures.Abstract:
The reconstruction of all nine unknown elastic moduli of orthotropic plate structures has been achieved using a single-transmitter-multiple-receiver (STMR) compact structural health monitoring (SHM) array. This method uses the velocity measurement of the fundamental guided Lamb wave modes (S0 and A0), generated from a central transmitter, and received by a sparse array of receivers that encircle the transmitter. The measured velocities are then used in an inversion algorithm based on genetic algorithms. A prototype compact STMR array was developed and used in the measurement. Simulated data were used to demonstrate the feasibility of the technique. Experiments were conducted on 3.15 mm graphite–epoxy composite plate using a PZT based STMR array as well as laser vibrometer based displacement measurement. Experimental Lamb wave velocity data were used to validate the present technique. This technique finds application in the areas of material characterization and SHM of anisotropic plate-like structures used in aerospace and automobile components made using fiber reinforced composites.read more
Citations
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Journal ArticleDOI
Simultaneous measurement of ultrasonic longitudinal wave velocities and thicknesses of a two layered media in the absence of an interface echo
Surya Prakash Kannajosyula,Vamshi Krishna Chillara,Krishnan Balasubramaniam,C. V. Krishnamurthy +3 more
TL;DR: The proposed method works in the absence of an interface echo and requires the total thickness of the sample to be known, and is found to be sensitive to the total sample thickness but fairly insensitive to noise in the data.
Journal ArticleDOI
Efficient mathematical representations for computing the forced wave dynamics of anisotropic laminated composites
TL;DR: Explicit integral and asymptotic representations for the total wave fields and specific guided waves generated in anisotropic laminate structures by surface loads are offered as a basis for low-cost computer models.
Dissertation
Modélisation de la propagation des ondes élastiques dans un milieu composite à microstructure 3D
TL;DR: In this paper, the authors propose a method for the homogeneisation dynamique of the structure of a meche in the context of the propagation of ultrasons in microscopiques.
Journal ArticleDOI
Messsystem zur Bestimmung akustischer Kenngrößen stark absorbierender, transversal isotroper Kunststoffe
TL;DR: In this paper, a waveguide-based approach for the determination of highly absorbing, transversely isotropic polymers for numerical simulation purposes is presented, based on a multimodal simulation of wave propagation.
Journal ArticleDOI
Guided Wave Monitoring of Nano-Fe3O4 Reinforced Thermoplastic Adhesive in Manufacturing of Reversible Composite Lap-Joints using Targeted Electromagnetic Heating
Rajendra Prasath Palanisamy,Oleksii Karpenko,Suhail Hyder Vattathurvalappil,Yiming Deng,Lalita Udpa,Mahmoodul Haq +5 more
TL;DR: In this article, an ultrasonic guided wave (GW) technique for monitoring the adhesive state and providing feedback to control the electromagnetic process is presented. But, it is essential to accurately measure the temperature of the adhesive since overheating may cause degradation and underheating may introduce inefficient bonding.
References
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Jerome P. Lynch,Kenneth J. Loh +1 more
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Tuned Lamb-Wave Excitation and Detection with Piezoelectric Wafer Active Sensors for Structural Health Monitoring
TL;DR: In this paper, the capability of embedded piezoelectric wafer active sensors (PWAS) to excite and detect tuned Lamb waves for structural health monitoring is explored.
Journal ArticleDOI
On the determination of phase and group velocities of dispersive waves in solids
Wolfgang Sachse,Yih-Hsing Pao +1 more
TL;DR: In this article, a new technique is developed to determine the dispersion relation and the propagational speeds of waves in dispersive solids, which can be applied to measurements of acoustic or electromagnetic wave speeds in other dispersive media.
Journal ArticleDOI
Detection and monitoring of hidden fatigue crack growth using a built-in piezoelectric sensor/actuator network: I. Diagnostics
Jeong-Beom Ihn,Fu-Kuo Chang +1 more
TL;DR: In this paper, a piezoelectric-based built-in diagnostic technique has been developed for monitoring fatigue crack growth in metallic structures, which consists of three major components: diagnostic signal generation, signal processing and damage interpretation.
Journal ArticleDOI
Structural health monitoring using scanning laser vibrometry: I. Lamb wave sensing
TL;DR: In this article, a non-contact method for low-frequency Lamb wave sensing using a laser Doppler velocimeter is presented, and the results are validated using classical piezoceramic-based sensing and numerical simulations.