Identification of complex crack damage for honeycomb sandwich plate using wavelet analysis and neural networks

Yam, L.H.; Yan, Yi; Li, Cheng; Jiang, Jie

doi:10.1088/0964-1726/12/5/301

Cited by 23 publications

(11 citation statements)

References 14 publications

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“…Materials with periodic pore structures are widely used as sandwich structures because of light weight, strong strength and stiffness. Due to the low density and low thermal conductivity of sandwich core structure materials can perform anisotropic design and manufacture according to special requirements, and the combination of stealth technology and sandwich core structures can form a dual functional structure that can not only carry load but also transmit wave, therefore, it has attracted much attention in aviation, aerospace and other fields 5–10 …”

Section: Figurementioning

confidence: 99%

Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole‐core structure wave‐transmitting materials

Qin

Gao

et al. 2023

Micro & Optical Tech Letters

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The variation law of equivalent dielectric properties of sandwich hole-core structure materials are investigated based on the analysis method, where the hole-core structure can be three kinds of structures, such as square, hexagon, and circle. Considering the hole-core structure is anisotropic, the calculation method of the electromagnetic parameters on the sandwich hole-core structure wave-transmitting materials are first derived. The accuracy of this method is validated by a numerical example of a plane wave incidence on a sandwich hole-core structure materials in free space. In addition, an S-parameter inversion method is proposed to calculate the equivalent dielectric and the results using phase-compensated to solve the inaccurate calculation of the dielectric around the S-parameter half-wavelength resonance. Finally, according to this model, the equivalent dielectric constant increases with increasing the incident angle for transverse electric (TE) polarized wave incidence and transverse magnetic (TM) polarized wave incidence, while an opposite phenomenon occurs for TE polarized wave incidence and TM polarized wave incidence on equivalent loss tangent.analysis method, sandwich hole-core structure wave-transmitting materials, The variation law of equivalent dielectric properties How to cite this article: Qin L, Yu C-Y, En L, Tu Y-H, Long J-W. Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole-core structure wave-transmitting materials.

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Section: Figurementioning

confidence: 99%

Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole‐core structure wave‐transmitting materials

Qin

Gao

et al. 2023

Micro & Optical Tech Letters

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“…Recently, some researchers have reported new methods to evaluate the dynamic responses of sandwich structures. Yam et al (24) studied crack detection in the facesheet of a honeycomb sandwich structures using energy spectra of the dynamic responses decomposed by wavelet transform and an artificial neural network (ANN). Nichols et al (25) showed a procedure for detecting impact damage in foam core sandwich utilizing concepts from the field of information theory.…”

Section: Damage Detection Using Dynamic Responsementioning

confidence: 99%

Smart Composite Sandwich Structures for Future Aerospace Application -Damage Detection and Suppression-: a Review

Takeda

Minakuchi

Okabe

2007

JMMP

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Sandwich structures with advanced composite facesheets are attracting much attention as a solution to maximize the potential of composite materials. However, the composite sandwich structures are prone to damage, such as impact damage and debonding. Although these damages are difficult to detect using conventional nondestructive inspection method, they cause significant reduction in the mechanical properties. Hence, several researchers have attempted to detect and suppress the damages using smart sensors and actuators. In this paper recent developments on smart technologies to improve reliability of the composite sandwich structures are reviewed. First, the state-of-the-art sandwich technology in aerospace application is presented. Next, typical damages in composite sandwich structures are described, which is essential to effectively apply the smart technologies to sandwich structures. Then, smart technologies which have been applied to sandwich structures are briefly shown with focusing specific properties of sandwich structures. It includes damage detection using dynamic response, wave propagation and optical fiber sensors. Finally, a smart honeycomb sandwich concept is also presented. State-of-the-art sandwich technology in aerospace structuresSandwich concept has wide range of advantages and potentials over quasi metal-derived design. Since the facesheets are continuously sustained by the core, the global and local stiffening can be achieved. Moreover, the integral simple stiffening reduces the complexity in analysis, manufacturing and maintenance, resulting in cutting the total life cycle cost of the structure. Introduction of sandwich structures in fuselage shells reduces the noise level inside the cabin, because of high damping properties of the core materials, and thus increases passengers' comfort. In this application, an integration of thermal isolation is also possible.

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“…In other cases, structural response is analyzed using techniques for signal processing, as the wavelet transform, to recover structural parameters and, from them, to determine possible structural damage. () In other works, damage detection is studied as a parameter identification problem where the stiffness, mass, and damping coefficient are recovered and then used to obtain the natural frequencies and mode shapes. For example, in Ling et al() and Kuwabara et al,() an autoregressive with exogenous input model is used to identify the stiffness of all the stories.…”

Section: Introductionmentioning

confidence: 99%

Shear building stiffness estimation by wave traveling time analysis

Morales‐Valdez

Álvarez-Icaza

Sánchez‐Sesma

2017

Struct Control Health Monit

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SummaryA novel damage identification technique to estimate stiffness in a multistory building supported on solid ground is presented. Based on a shear building model, a 1-dimensional wave equation for a vertically propagating shear wave is derived. A Ricker pulse is used as excitation signal and propagated through the building. Wave propagation in the building is based on the Thomson-Haskell method, where each story is represented as a single layer in a multiple stratum model. The wave arrival times of the pulse at each story are used to calculate the stiffness of the columns. The involved calculations in this method grow only linearly with the number of stories, as opposed to other identification methods, as modal analysis, that grow geometrically; this makes this approach an interesting alternative method to asses building integrity. Simulation result for a building with heterogeneous characteristics across the stories confirms the feasibility of the proposal.

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Identification of complex crack damage for honeycomb sandwich plate using wavelet analysis and neural networks

Cited by 23 publications

References 14 publications

Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole‐core structure wave‐transmitting materials

Study on dielectric properties of electromagnetic wave oblique incidence on sandwich hole‐core structure wave‐transmitting materials

Smart Composite Sandwich Structures for Future Aerospace Application -Damage Detection and Suppression-: a Review

Shear building stiffness estimation by wave traveling time analysis

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