Chaotic insonification for health monitoring of an adhesively bonded composite stiffened panel

Fasel, Timothy R.; Todd, Michael D.

doi:10.1016/j.ymssp.2009.12.002

Cited by 13 publications

(6 citation statements)

References 33 publications

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“…Most previous research using Lamb wave–based damage detection approaches focused on simple composite structures, such as plates and beams. Fasel and Todd (2010) used ultrasonic chaotic excitations to detect various damage conditions of the composite bonded joint. A statistical classification algorithm was used to correlate the real damage state with the classification results.…”

Section: Introductionmentioning

confidence: 99%

Damage assessment of CFRP composites using a time–frequency approach

Liu

Fard

Chattopadhyay

et al. 2012

Journal of Intelligent Material Systems and Structures

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A damage assessment methodology using a time–frequency signal processing technique is presented in this article. Delaminations are detected in composite structures with multiple stiffeners. Because Lamb waves are complex in nature, due to wave dispersion and scattering, a robust signal processing technique is required to extract features from Lamb wave signals. In this article, the matching pursuit decomposition algorithm is used for extracting wavelets from the Lamb wave signals in the time–frequency domain. A small time–frequency atom dictionary is defined to avoid the exhaustive search over the time–frequency domain and to reduce the computation costs. The propagation characteristics of Lamb waves in stiffened composite panels are investigated. The delaminations are detected by identifying the converted Lamb wave modes introduced by the structural imperfection. A two-step damage detection approach, which uses both pulse-echo and pitch-catch active sensing schemes, is developed for the identification of delaminations. The delamination is quantified using a signal energy-based damage index. The matching pursuit decomposition algorithm is further used to localize the delamination position by solving a set of nonlinear equations. The results show that the matching pursuit decomposition algorithm can be used to identify and localize the seeded delaminations in composite structures with complex geometries and material properties.

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Section: Introductionmentioning

confidence: 99%

Damage assessment of CFRP composites using a time–frequency approach

Liu

Fard

Chattopadhyay

et al. 2012

Journal of Intelligent Material Systems and Structures

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“…After preliminary tests and signal processing, the optimal frequency selected was 250 kHz. 3 American Institute of Aeronautics and Astronautics The experiment consisted of two stages. In the first stage, the healthy plate was subjected to temperature changes ranging from 0 ⁰C to 60 ⁰C at 10 ⁰C intervals.…”

Section: Methodsmentioning

confidence: 99%

“…The use of guided waves for damage detection and localization in simple composite structures, such as plates, has been reported. Fasel et al [3] used ultrasonic chaotic wave excitations to 2 American Institute of Aeronautics and Astronautics detect various damage conditions in the composite bonding joint. A statistical classification algorithm was used to correlate the real damage state with the classification results.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Approach to Investigate Temperature Effects on Guided Wave Based Structural Health Monitoring

Liu

Fard

Chattopadhyay³

2012

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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Temperature variations can have significant effects on guide wave propagation, and therefore can increase the detection uncertainty of the structural health monitoring (SHM) system. The effect of this variation has been investigated for detecting impact damage in carbon fiber reinforced composites. Surface instrumented piezoelectric wafers are used in this work to detect the low velocity impact damage in a braided carbon fiber reinforced composite plate over a temperature range of 0 ⁰C to 60 ⁰C. The effects of temperature variation and thermal cycles on guided wave propagations in healthy composite plates are characterized first. The information is then used to develop a compensation algorithm to minimize the thermal effects on detection. A statistical damage detection and quantification approach is developed using and Auto-Regressive with eXogenous (ARX) model and local outlier analysis. The developed methodology is experimentally validated using the pitch-catch guided wave testing approach within the temperature range.

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“…Low-frequency HIFU is widely used clinically for drug delivery, fractured bone and cartilage, nerve stimulation, inflamed tendons, wound healing and ligaments repairing 52,53 . Compared with the thermal therapy of highenergy US, the non-thermal effects of low-frequency HIFU mainly display in the mechanical stimulation induced by microbubbles, microjets, cavitation and acoustic steaming [54][55][56][57] . In fact, low-frequency FUS can reach deep into the body, which allows precise local treatment and avoids possible disadvantageous side effects to surrounding healthy tissues 58 .…”

Section: Medical Application Of Low-frequency Hifumentioning
confidence: 99%

Low-frequency HIFU induced cancer immunotherapy: tempting challenges and potential opportunities
Shi
¹
,
Zhong
²
,
Fu-li
³

et al. 2019
Cancer Biol Med
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Immunotherapy is playing an increasingly important role in the treatment of tumors. Different from the traditional direct killing or excision therapies, immunotherapy depends on autologous immunity to kill tumor cells and tissues by activating or enhancing the bodys immune system. Large numbers of recent studies suggest that low-frequency HIFU can not only enhance the intensity of the bodys anti-cancer immune response, but also improve the efficiency of immunotherapy drug delivery to strengthen the effects of tumor immunotherapy. The focused ultrasound (FUS) destructs the tumor and simultaneously generates tumor debris and tumor-associated antigens, which enhances the immunogenicity of the tumor and stimulates the immune cells, inducing the bodys immune response. Microbubbles are clinically used as a contrast. As a matter of fact, the addition of microbubbles can reinforce the destructive effect of FUS on the tumor and activate a stronger immune response. The combined application of ultrasound and microbubbles can more effectively open the blood brain barrier (BBB), which is beneficial to improving the intake of immune cells or immunotherapy drugs and exerting a positive influence in the lesion area. Currently, microbubbles and nanoparticles are commonly used as gene and drug carriers. Using ultrasound, the immune-related gene or antigen delivery itself can enhance the immune response and improve the efficacy of the immunotherapy.

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Chaotic insonification for health monitoring of an adhesively bonded composite stiffened panel

Cited by 13 publications

References 33 publications

Damage assessment of CFRP composites using a time–frequency approach

Damage assessment of CFRP composites using a time–frequency approach

A Statistical Approach to Investigate Temperature Effects on Guided Wave Based Structural Health Monitoring

Low-frequency HIFU induced cancer immunotherapy: tempting challenges and potential opportunities

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