Guided wave generation and source energy partition in acoustic fluid with an immersed elastic plate

2016 ◽  
Author(s):  
E. V. Glushkov ◽  
N. V. Glushkova ◽  
O. A. Miakisheva
Keyword(s):  
Elastic Plate ◽  
Wave Generation ◽  
Guided Wave ◽  
Energy Partition ◽  
Acoustic Fluid

scholarly journals Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 860
Author(s):  
Mikhail V. Golub ◽  
Alisa N. Shpak ◽  
Inka Mueller ◽  
Sergey I. Fomenko ◽  
Claus-Peter Fritzen
Keyword(s):  
Damage Detection ◽  
Elastic Plate ◽  
Lamb Wave ◽  
Wave Scattering ◽  
Hybrid Approach ◽  
Guided Wave ◽  
Open Crack ◽  
Damage Indices ◽  
Impulse Function ◽  
Thin Walled

Since stringers are often applied in engineering constructions to improve thin-walled structures’ strength, methods for damage detection at the joints between the stringer and the thin-walled structure are necessary. A 2D mathematical model was employed to simulate Lamb wave excitation and sensing via rectangular piezoelectric-wafer active transducers mounted on the surface of an elastic plate with rectangular surface-bonded obstacles (stiffeners) with interface defects. The results of a 2D simulation using the finite element method and the semi-analytical hybrid approach were validated experimentally using laser Doppler vibrometry for fully bonded and semi-debonded rectangular obstacles. A numerical analysis of fundamental Lamb wave scattering via rectangular stiffeners in different bonding states is presented. Two kinds of interfacial defects between the stiffener and the plate are considered: the partial degradation of the adhesive at the interface and an open crack. Damage indices calculated using the data obtained from a sensor are analyzed numerically. The choice of an input impulse function applied at the piezoelectric actuator is discussed from the perspective of the development of guided-wave-based structural health monitoring techniques for damage detection.

scholarly journals Development of a Novel Guided Wave Generation System Using a Giant Magnetostrictive Actuator for Nondestructive Evaluation

Sensors ◽  
2018 ◽  
Vol 18 (3) ◽  
pp. 779 ◽  
Author(s):  
Mingzhang Luo ◽  
Weijie Li ◽  
Junming Wang ◽  
Ning Wang ◽  
Xuemin Chen ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Wave Generation ◽  
Guided Wave ◽  
Generation System ◽  
Magnetostrictive Actuator

scholarly journals Signal Strength Enhancement of Magnetostrictive Patch Transducers for Guided Wave Inspection by Magnetic Circuit Optimization

2019 ◽  
Vol 9 (7) ◽  
pp. 1477 ◽  
Author(s):  
Jianjun Wu ◽  
Zhifeng Tang ◽  
Keji Yang ◽  
Fuzai Lv
Keyword(s):  
Magnetic Field ◽  
Magnetic Circuit ◽  
Energy Conversion Efficiency ◽  
Wave Generation ◽  
Guided Wave ◽  
Shear Mode ◽  
Circuit Optimization ◽  
Affecting Factors ◽  
Long Distance ◽  
Dynamic Magnetic Field

Magnetostrictive patch transducers (MPT) with planar coils are ideal candidates for shear mode generation and detection in pipe and plate inspection with the advantages of flexibility, lightness and good directivity. However, the low energy conversion efficiency limits the application of the MPT in long distance inspection. In this article, a method for the enhancement of the MPT was proposed by dynamic magnetic field optimization using a soft magnetic patch (SMP). The SMP can reduce the magnetic resistance of the magnetic circuit, which increases the dynamic magnetic field intensity in the magnetostrictive patch during wave generation and restricts the induced dynamic magnetic field within the area around the coils for sensing during wave detection. Numerical simulations carried out at different frequencies verified the improvement of the dynamic magnetic fields by the SMP and influence of different affecting factors. The experimental validations of the signal enhancement in wave generation and detection were performed in an aluminum plate. The amplitude magnification could reach 12.7 dB when the MPTs were covered by the SMPs. Based on the numerical and experimental results, the SMP with a large relative permeability and thickness and close fitting between the SMP and coils were recommended when other application conditions were met.

Integrated guided wave generation and sensing using a single laser source and optical fibers

2010 ◽  
Vol 21 (10) ◽  
pp. 105207 ◽  
Author(s):  
Hyeonseok Lee ◽  
Hyun-Jun Park ◽  
Hoon Sohn ◽  
Il-Bum Kwon
Keyword(s):  
Optical Fibers ◽  
Wave Generation ◽  
Guided Wave ◽  
Laser Source ◽  
Single Laser

Guided Wave Generation and Sensing in an Elastic Beam Using MFC Piezoelectric Elements: Theory and Experiment

2010 ◽  
Vol 21 (16) ◽  
pp. 1617-1625 ◽  
Author(s):  
Evgeny Glushkov ◽  
Natalia Glushkova ◽  
Oleg Kvasha ◽  
Dominik Kern ◽  
Wolfgang Seemann
Keyword(s):  
Elastic Beam ◽  
Wave Generation ◽  
Guided Wave ◽  
Piezoelectric Elements ◽  
Theory And Experiment

scholarly journals Fault Zone Guided Wave generation on the locked, late interseismic Alpine Fault, New Zealand

2015 ◽  
Vol 42 (14) ◽  
pp. 5736-5743 ◽  
Author(s):  
J. D. Eccles ◽  
A. K. Gulley ◽  
P. E. Malin ◽  
C. M. Boese ◽  
J. Townend ◽  
...  
Keyword(s):  
New Zealand ◽  
Fault Zone ◽  
Wave Generation ◽  
Guided Wave ◽  
Alpine Fault
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