Measurement of the Acoustic Non-Linearity Parameter of Materials by Exciting Reversed-Phase Rayleigh Waves in Opposite Directions

Yan, Bingsheng; Song, Yuzhou; Nie, Shuai; Yang, Mingchao; Liu, Ziran

doi:10.3390/s20071955

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…2. Lamb waves interact with nonlinear effects to produce higher harmonics as they propagate through the bolted structure [21]. The frequency domain of the fundamental signals collected by the active sensing method has a second harmonic amplitude that is too small, and the errors in the extraction of the damage indexes are too large.…”

Section: Nonlinear Damage Index Extraction 221 Phase Reversalmentioning

confidence: 99%

A nonlinear Lamb wave-based tight contact stage identification and pretightening state quantitative monitoring method for bolts

Tian

Wang

Yang

et al. 2023

Preprint

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Bolt connections are subjected to severe service conditions, such as cyclic loading and mechanical shock, leading to loosening failure. Commonly, the degradation of the bolt pretightening state is a multistage process, consisting of the tight contact stage (TCS) and significant loosening stage. Therefore, utilizing a single model to monitor the pretightening state in the full degradation stage is difficult. Here, a method based on nonlinear Lamb waves to identify the TCS of bolts and quantitatively monitor the pretightening state to bolt loosening is proposed. In the proposed method, phase reversal technology is first adopted to enhance the sensitivity and reduce the calculation errors of nonlinear damage indexes for bolt loosening in the TCS, and then the phase reversal relative nonlinear coefficient (PRC) is constructed. This indicator overcomes the disadvantage that linear indicators are insensitive to early loosening and realizes the identification of critical points between the TCS and the significant loosening stage, which provides a prerequisite for constructing a staged loosening monitoring model. After the TCS is determined, a quantitative monitoring model for loosening, which fuses seven nonlinear damage indexes, is established based on canonical correlation forests to evaluate the pretightening state. To verify the effectiveness of the method, an experimental study of bolts is carried out, the lamb signals under different loosening states are measured, and the monitoring effects of different indicators are compared and analyzed. The comparison results show that the proposed method has higher accuracy than conventional approaches.

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Section: Nonlinear Damage Index Extraction 221 Phase Reversalmentioning

confidence: 99%

A nonlinear Lamb wave-based tight contact stage identification and pretightening state quantitative monitoring method for bolts

Tian

Wang

Yang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Nonlinear ultrasonic method is much more sensitive to micro-scale damages than linear technique [26][27][28][29][30]. Recently, nonlinear ultrasonic techniques have been applied to evaluate bone damage status including nonlinear resonant ultrasound spectroscopy [1,31], nonlinear dynamic response [32] and nonlinear modulation measurements [33,34].…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Numerical Study on the Interactions Between Nonlinear Ultrasonic Guided Waves and a Single Crack in Bone Materials With Motivation to the Evaluation of Micro Cracks in Long Bones

et al. 2020

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Fatigue damage in a bone occurs in the form of micro-scale cracks with the lengths as small as to a few microns. The evaluation of cracks in bones has recently been a hot topic. However, the current most frequently used method is based on traditional linear ultrasound, which is just sensitive to gross damages rather than micro cracks. Nonlinear ultrasonic technique, which is capable of detecting microscale damages, has been widely used in metallic structures. However, few study has been directed to employing second harmonic generation of nonlinear ultrasound to evaluate fatigue damages in bones. In this study, a preliminary study is conducted on the interactions between nonlinear guided waves and a single crack in bone materials motivating to the evaluation of micro cracks in long bones. Considering the symmetry, asymmetry, location, orientation, length and width of the crack in bone materials, their influences on second harmonic responses are discussed in detail. Our results are presented as follows. Firstly, not only the primary S0 but also A0 mode Lamb wave generates the second harmonic component of S0 mode after interacting with a symmetric crack. Secondly, along the thickness direction, the primary S0 mode Lamb wave possesses almost the same detection sensitivity, no matter where the crack is located. Thirdly, the amplitudes of S0 mode second harmonic component are increased slightly when the oblique angle of the crack is set from 0º to 45º , while the amplitudes increase dramatically when the oblique angle changes to 67.5º and 90º .Lastly, the second harmonic amplitude and the relative acoustical nonlinear parameter are increased with the length of the crack, while they possess a monotonically decreasing relationship with the width of the crack. Our preliminary studies will provide priori knowledge when using nonlinear ultrasonic guided waves for detecting micro-scale cracks in long bones in future clinical inspections.INDEX TERMS Nonlinear ultrasonic Lamb waves, bone structures, the detection of cracks in bones, second harmonic component, the relative acoustical nonlinear parameter, ultrasonic signal processing

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A quantitative monitoring method for the pretightening state of bolts based on nonlinear Lamb waves and incremental learning

Wang,

Tian,

Yang

et al. 2023

Nondestructive Testing and Evaluation

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Measurement of the Acoustic Non-Linearity Parameter of Materials by Exciting Reversed-Phase Rayleigh Waves in Opposite Directions

Cited by 4 publications

References 16 publications

A nonlinear Lamb wave-based tight contact stage identification and pretightening state quantitative monitoring method for bolts

A nonlinear Lamb wave-based tight contact stage identification and pretightening state quantitative monitoring method for bolts

A Preliminary Numerical Study on the Interactions Between Nonlinear Ultrasonic Guided Waves and a Single Crack in Bone Materials With Motivation to the Evaluation of Micro Cracks in Long Bones

A quantitative monitoring method for the pretightening state of bolts based on nonlinear Lamb waves and incremental learning

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