Resonant activation of different intermodulation frequencies using dual excitations

Hanuman, N. S. V. N.; Roy, Subhankar; Bose, Tanmoy

doi:10.1016/j.ultras.2020.106138

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…The generation of the second harmonic frequency response is very significant to characterize the material nonlinearity. So a relative acoustic nonlinearity parameter ( β 2 ) is described by the ratio of the second harmonic frequency response amplitude to the square of first harmonic response amplitude as follows 22,24,25 where A 1 and A 2 : amplitudes of fundamental and second harmonic frequency, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Relative acoustic nonlinearity parameter variation with local defect resonance frequencies and its different harmonics

Hanuman

Bose

2022

Noise & Vibration Worldwide

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In recent times, nonlinear ultrasonic inspection has become a very reliable technique to characterize micro-scale cracks and small-scale delaminations. In this paper, an analytical framework is developed for the orthotropic composite plate to calculate the variation of relative acoustic nonlinearity parameter, a quantitative measurement of nonlinearity at the delamination region. The analytical investigation is justified with numerical and experimental research using a carbon fiber-reinforced polymer (CFRP) plate with three delaminations. Two incident waves are used for excitation, out of which the first wave frequency is varied as local defect resonance (LDR) frequency ( fd), subharmonic LDR frequency (2 fd), second-order superharmonic LDR frequency ( fd/2), and third-order superharmonic LDR frequency ( fd/3) while the second incident wave is taken as a single periodic frequency. Different delamination sizes, positions, and depths were used to understand the second-order relative acoustic nonlinearity parameter ( β2) with other LDR frequencies as well as its harmonics. It has been observed from analytical, numerical, and experimental results that the relative acoustic nonlinearity parameter is maximum at LDR frequencies. It increases in case of surface level delaminations.

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Section: Methodsmentioning

confidence: 99%

“…23 In the similar fashion, the nonlinear behavior of the delaminations with their respective sizes has been presented. 24 The higher harmonic responses are not sufficient to find the fundamental frequency. But the second harmonic response provides accurate fundamental frequency, and efficient nonlinearity is located in the flaw region.…”

Section: Introductionmentioning

confidence: 99%

Relative acoustic nonlinearity parameter variation with local defect resonance frequencies and its different harmonics

Hanuman

Bose

2022

Noise & Vibration Worldwide

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“…Both the numerical and experimental results show intermodulation peaks that are in good agreement and hence proves the efficacy of bicoherence analysis in LDR frequency detection. The technique is further used in the case of multiple delamination in the glass fibre reinforced polymer (GFRP) plate (Hanuman et al, 2020). An acoustic nonlinearity parameter was considered that shows a relation with delamination diameter and order of harmonics.…”

Section: Introductionmentioning

confidence: 99%

Detection of mode frequencies for spherical cavity embedded within a mild steel plate

Roy

Bose

2022

Journal of Vibration and Control

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The modern era of structures has observed a vast increase in non-destructive evaluation techniques in order to detect unwanted damages or porosities within the structure. Detection of defect frequencies will play a vital role in local defect resonance–based defect imaging in the future. In this paper, a technique for porosity and cavity detection in metals is discussed. A numerical investigation is carried out first on a square mild steel plate with a spherical cavity and a square mild steel block with multiple cavities. Different resonance frequencies and corresponding mode shapes in the case of the single cavity are calculated using steady state dynamic analysis. Six fundamental mode shapes are identified as Rocking (R), Torsional (T), Bouncing (B), 4-noded (4 N), 6-noded (6 N) and 8-noded (8 N) modes. Moreover, an explicit dynamic analysis is performed by exciting the model with a chirp signal for both cases of single and multiple cavities. The numerical study is supported by experimental results, performed on a mild steel plate embedded with a single spherical cavity and previously published literature. It is observed that the analytical, numerical as well as the experimental results obtained for all the modes are in close agreement with each other. The bouncing mode is found to be the promising one for pore imaging due to its uniform displacement across all the directions.

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Low-Power Fully Acoustic Non-Destructive Testing of Glass Fiber-Reinforced Composite Plate Utilizing Local Defect Resonance

Hanuman,

Bose

2023

Strength Mater

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Resonant activation of different intermodulation frequencies using dual excitations

Cited by 5 publications

References 23 publications

Relative acoustic nonlinearity parameter variation with local defect resonance frequencies and its different harmonics

Relative acoustic nonlinearity parameter variation with local defect resonance frequencies and its different harmonics

Detection of mode frequencies for spherical cavity embedded within a mild steel plate

Low-Power Fully Acoustic Non-Destructive Testing of Glass Fiber-Reinforced Composite Plate Utilizing Local Defect Resonance

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