Guided wave propagation analysis in stiffened panel using time-domain spectral finite element method

Zheng, Youqi; Xu, Chao; Sun, Jiaying; Du, Fei

doi:10.1016/j.cja.2021.11.014

Cited by 17 publications

(6 citation statements)

References 37 publications

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“…On the other hand, the detailed elastic wave propagation analysis allows us to better understand the wave-structure interactions. For this purpose (FEM) [6], [7], the semi-analytical finite element (SAFE) method [8], and the spectral element method (SEM) [9] are utilised. The SEM method in the frequency domain was utilised to model wave propagation in the stiffened structures with different cross-sections [10].…”

Section: Introductionmentioning

confidence: 99%

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Low-frequency air-coupled transducer based damage detection in composite materials

Wandowski,

Kudela,

Radzienski

2024

J. Phys.: Conf. Ser.

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In this paper results of simulations of non-contact elastic wave generation in the composite panel based on acoustic to elastic wave transformation are presented. For this purpose simulations of acoustic wave generation and processing are based on the FEM method in COMSOL. Elastic wave generation and propagation are based on the spectral element method (SEM) in the time domain. The SEM model utilises time-varying acoustic pressure distributions calculated in the FEM. The SEM allows to simulate the interactions of elastic waves with the delamination. Damage localization is based on RMS elastic wave energy maps. In this research a panel made of carbon fibre-reinforced polymer composite is investigated. Research related to low-frequency air-coupled transducer (ACT) is presented. The utilisation of low-frequency waves allows for the reduction of the effects of the wave attenuation in composite material. The proposed combination of FEM and SEM gives an efficient tool for the simulation of non-contact wave generation for non-destructive testing analysis.

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Section: Introductionmentioning

confidence: 99%

“…The SEM method in the frequency domain was utilised to model wave propagation in the stiffened structures with different cross-sections [10]. The SEM in the time domain was utilised for the investigation of stiffener influence on wave propagation and mode conversion [6].…”

Section: Introductionmentioning

confidence: 99%

Low-frequency air-coupled transducer based damage detection in composite materials

Wandowski,

Kudela,

Radzienski

2024

J. Phys.: Conf. Ser.

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“…12 Among the proposed SHM technologies, piezoelectric transducer (PZT) and guided wave (GW)-based monitoring methods have the advantages of propagating between the structural surfaces for a long distance and being sensitive to small defects. [13][14][15][16] Therefore, this method can realize structural state monitoring including ablation, while avoiding deploying PZT sensors in harsh environment areas of TPS. Chang et al 17 explored the possibility of detecting bolt loosening in carbon-carbon (C-C) TPS panels by adopting an active GW monitoring method.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on online monitoring of high temperature and high speed airflow ablation of quartz ceramic thermal protection structure using guided wave

Ren

Zheng

Qiu

2023

Structural Health Monitoring

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Thermal protection structure (TPS) plays a key role in protecting hypersonic flight vehicles from harsh service environment and has been widely used. As a common ablative thermal protection material, quartz ceramic TPS realizes thermal insulation by generating ablation during the reentry phases. The structural state of quartz ceramic TPS therefore is of great importance to the service performance and safety of hypersonic flight vehicles, and shows an urgent need for structural health monitoring (SHM). However, the monitoring of real ablation of quartz ceramic structure is barely considered in the current study, let alone online monitoring under harsh service environment, which brings a great challenge to the implementation of reliable ablation monitoring. Aiming at online ablation monitoring of quartz ceramic structure, this paper performs experimental research by taking advantage of guided wave (GW)-based monitoring method. An ablation experiment and monitoring system is built to generate real ablation under high temperature and high speed airflow and perform GW monitoring. The maximal temperature of the system can reach about 2100 °C. The feasibility of ablation monitoring is verified by analyzing ablation-induced influence on GW signals. Gaussian mixture model (GMM) is adopted to combine with GW method to suppress the high temperature variation caused by uncertainty influence on GW signals during the ablation process, so that reliable monitoring of ablation can be realized. Experimental results show that online monitoring of ablation propagation of quartz ceramic structure under high temperature variation is achieved, which can be further used for ablation quantification evaluation.

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“…It is formed by the repeated reflection and superposition of P wave and SV wave on the upper and lower surfaces of the plate, which has the characteristics of multimode and dispersion. If the general 2D numerical simulation method is used, only the section of the plate can be simulated, 32 while the entire 3D structure cannot be simulated simultaneously. 22,23 In order to obtain the wavefield of the plane on the whole structure, the 2D-FDTD method needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

A rapid 2D-FDTD method for damage detection in stiffened plate using time-reversed Lamb wave

Fan

Zhao

2023

Structural Health Monitoring

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This study proposes an improved two-dimensional finite-difference time-domain method (2D-FDTD) to simulate the propagation of guided waves in three-dimensional (3D) stiffened plates, which can greatly reduce the calculation amount and accelerate the simulation process. This method can be used for damage-detection imaging based on time-reversal with wavefield reconstruction (TR-RW) as a quick numerical simulation of wavefield is available. First, the piezoelectric wafer active sensors excite and collect Lamb wave signals in the damaged stiffening plate, after which these signals are reversed in the time domain. Second, the TR signals are again triggered by each sensor in turn on the reconstructed numerical model of the tested structure with 2D-FDTD. Third, the wavefield animation is obtained through simulation. Finally, the energy of the wavefield can be focused in certain areas, indicating the location of the damage. As an example, TR-RW, combined with 2D-FDTD method, is adopted to detect damage in an integral grid-stiffened plate, showing that the proposed 2D method can decrease the calculation time from dozens of minutes in the 3D model to dozens of seconds, which is of great significance for damage-detection applications. Furthermore, compared with the virtual TR method, the combined TR-RW and 2D-FDTD method can overcome the multipath effect and improve the damage location accuracy of stiffened structures.

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Guided wave propagation analysis in stiffened panel using time-domain spectral finite element method

Cited by 17 publications

References 37 publications

Low-frequency air-coupled transducer based damage detection in composite materials

Low-frequency air-coupled transducer based damage detection in composite materials

Experimental research on online monitoring of high temperature and high speed airflow ablation of quartz ceramic thermal protection structure using guided wave

A rapid 2D-FDTD method for damage detection in stiffened plate using time-reversed Lamb wave

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