Assessment of debonding in sandwich CF/EP composite beams using A0 Lamb wave at low frequency

2011 ◽  
Vol 93 (2) ◽  
pp. 483-491 ◽  
Author(s):  
Samir Mustapha ◽  
Lin Ye ◽  
Dong Wang ◽  
Ye Lu
Keyword(s):  
Lamb Wave ◽  
Low Frequency ◽  
Composite Beams

Equation Chapter 1 Section 1Precise and target-oriented control of the low-frequency Lamb wave bandgaps

2021 ◽  
pp. 116367
Author(s):  
Yanzheng Wang ◽  
Chuanzeng Zhang ◽  
Weiqiu Chen ◽  
Zhengyang Li ◽  
Mikhail V. Golub ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Low Frequency

scholarly journals Low Frequency Generation and Detection of the Lamb Wave A0 Mode Using EMAT

2007 ◽  
Vol 127 (3) ◽  
pp. 367-372 ◽  
Author(s):  
Songsong Li ◽  
Toshimi Okada ◽  
Xiaoming Chen ◽  
Hongwei Dai
Keyword(s):  
Lamb Wave ◽  
Low Frequency ◽  
Frequency Generation

scholarly journals Control of low-frequency Lamb wave propagation in plates by boundary condition manipulation

2021 ◽  
Vol 129 (9) ◽  
pp. 094903
Author(s):  
Cliff J. Lissenden ◽  
Christopher N. Hakoda ◽  
Parisa Shokouhi
Keyword(s):  
Boundary Condition ◽  
Wave Propagation ◽  
Lamb Wave ◽  
Low Frequency ◽  
Lamb Wave Propagation

scholarly journals Model-Based Design of Low Frequency Lamb Wave EMATs for Mode Selectivity

2015 ◽  
Vol 34 (3) ◽  
Author(s):  
Matthias Seher ◽  
Peter Huthwaite ◽  
Michael J. S. Lowe ◽  
Peter B. Nagy
Keyword(s):  
Lamb Wave ◽  
Low Frequency ◽  
Model Based ◽  
Mode Selectivity

Localization of Lamb Wave Scattering Source Based on Time-Frequency Analysis

2013 ◽  
Vol 281 ◽  
pp. 276-281
Author(s):  
Ding Ma ◽  
Li Hua Shi ◽  
Shang Chen Fu ◽  
Hong Fu Cao
Keyword(s):  
Lamb Wave ◽  
Low Frequency ◽  
Wave Dispersion ◽  
Frequency Component ◽  
Localization Method ◽  
Time Frequency ◽  
Mode Decomposition ◽  
Frequency Components ◽  
Scattering Signal ◽  
Frequency Curves

Considering the influence of Lamb wave dispersion on the precision of damage detection, a new detection method of scattering source based on time-frequency curves and ellipse localization method is proposed. Empirical mode decomposition(EMD) is used to decompose the scattering signal into finite narrowband signals, and a modified continuous wavelet transform(CWT) is further used to get the time-frequency distribution(TFD) of the detected signal, and the arriving time of different frequency component is estimated based on TFD. A series of location results can be obtained from different frequency components using ellipse localization method. The damage position can finally be estimated by synthesizing localization results at different frequencies. Experiments on aluminum plate are conducted to demonstrate the efficiency of the proposed method. EMD-CWT analysis can get precise time-frequency curves in highly dispersive low frequency band of A0 mode. The damage location results is more accurate and the influence from occasional factors can be suppressed by using the synthesized method.

scholarly journals Clamping Resonators for Low-Frequency S0 Lamb Wave Reflection

2019 ◽  
Vol 9 (2) ◽  
pp. 257 ◽  
Author(s):  
Christopher Hakoda ◽  
Cliff Lissenden ◽  
Parisa Shokouhi
Keyword(s):  
Band Gap ◽  
Lamb Wave ◽  
Wave Reflection ◽  
Stop Band ◽  
Low Frequency ◽  
Wave Mode ◽  
Design Concept ◽  
The Other ◽  
Transmitted Signal ◽  
Wave Modes

A recent elastic metamaterial study found that resonators that “clamp” a plate waveguide can be used to create a frequency stop-band gap. The result was that the resonator array can prohibit the propagation of an A0 Lamb wave mode. This study investigates whether the concept can be extended to S0 Lamb wave modes by designing resonators that can prohibit the propagation of S0 Lamb wave modes in a 1-mm aluminum plate waveguide at 50 kHz. The frequency-matched resonators did not reduce the transmitted signal, leading to the conclusion that the design concept of frequency-matched resonators is not always effective. On the other hand, the resonators designed to clamp the upper surface of the plate were very effective and reduced the transmitted signal by approximately 75%.

Extremely low-frequency Lamb wave band gaps in a sandwich phononic crystal thin plate

2015 ◽  
Vol 29 (05) ◽  
pp. 1550027 ◽  
Author(s):  
Li Shen ◽  
Jiu Hui Wu ◽  
Zhangyi Liu ◽  
Gang Fu
Keyword(s):  
Lamb Wave ◽  
Vector Fields ◽  
Displacement Vector ◽  
Phononic Crystal ◽  
Lower Boundary ◽  
Low Frequency ◽  
Sound Insulation ◽  
Geometrical Parameters ◽  
Wave Band ◽  
Reduction Effect

In this paper, a kind of sandwich phononic crystal (PC) plate with silicon rubber scatterers embedded in polymethyl methacrylate (PMMA) matrix is proposed to demonstrate its low-frequency Lamb wave band gap (BG) characteristics. The dispersion relationship and the displacement vector fields of the basic slab modes and the locally resonant modes are investigated to show the BG formation mechanism. The anti-symmetric Lamb wave BG is further studied due to its important function in reducing vibration. The analysis on the BG characteristics of the PC through changing their geometrical parameters is performed. By optimizing the structure, a sandwich PC plate with a thickness of only 3 mm and a lower boundary (as low as 23.9 Hz) of the first anti-symmetric BG is designed. Finally, sound insulation experiment on a sandwich PC plate with the thickness of only 2.5 mm is conducted, showing satisfactory noise reduction effect in the frequency range of the anti-symmetric Lamb BG. Therefore, this kind of sandwich PC plate has potential applications in controlling vibration and noise in low-frequency ranges.

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