Insight into excitation and acquisition mechanism and mode control of Lamb waves with piezopolymer coating-based array transducers: Analytical and experimental analysis

Li, Yehai; Wang, Kai; Feng, Wei; Wu, Hefeng; Su, Zhongqing; Guo, Shifeng

doi:10.1016/j.ymssp.2022.109330

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…Lamb waves (Lamb, 1917) were obtained by H. Lamb in England in 1917 when solving the fluctuation equations by the flat plate free boundary condition. Lamb waves have dispersion characteristics and multimodal characteristics (Li et al, 2022). The dispersion characteristic refers to the different propagation speed of the waves with different frequencies.…”

Section: Basic Theory Of Lamb Wavesmentioning

confidence: 99%

Analysis and quantitative identification of guided wave propagation mechanism in concrete

Su,

Zhang,

Tang

et al. 2023

Front. Earth Sci.

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Concrete is widely used in bridges, tunnels, nuclear power plants and other buildings, the damage of concrete will bring significant safety hazards for the building, therefore, detecting concrete damage is of great significance. In this paper, the propagation characteristics of guided waves in concrete plates are investigated, and finite element simulation is used to analyze the sensitivity of guided waves to the damage of concrete materials under different excitation frequencies. Simulation experiments on guided wave propagation are performed on concrete materials containing damage in the excitation frequency range from 25 to 100 kHz. The signals received by the sensors are analyzed in the time domain, while the reflected wave signals resulting from the contact of the signals with the damage are analyzed in the frequency domain. The results show that the excitation frequencies of 25 and 60 kHz are more sensitive to damage, and the quantitative identification of damage without reference can be realized by using the peak signals in the frequency domain at different excitation frequencies.

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Section: Basic Theory Of Lamb Wavesmentioning

confidence: 99%

Analysis and quantitative identification of guided wave propagation mechanism in concrete

Su,

Zhang,

Tang

et al. 2023

Front. Earth Sci.

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“…where is the transducer operating frequency. It is well known that Equation (2) defines a straight line in the phase velocity vs domain, and the intersections with the different dispersion modes define the selection of the desired mode [33,34].…”

Section: Analysis Of Idt Geometriesmentioning

confidence: 99%

Design of Piezopolymer Interdigital Transducers with Scaled Electrode Geometries Based on FEM Analysis

2022

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The design of interdigital transducers (IDT) for active structural health monitoring (SHM) systems often requires a tuning of their characteristics for specific applications. IDTs are generally preferred for the selectivity of Lamb’s guided modes, but the directivity of the radiation pattern is a design parameter that is often difficult to customize for complex mechanical structures. This work proposes a comprehensive experimental study of the IDT with regular geometry, highlighting the dimensional parameters that can optimize the overall performance. From this study, a scaled electrode geometry emerged as a possible solution to shape the directivity diagram while maintaining the selectivity of the guided wave modes. This study based on FEM simulators led to a more versatile design of IDTs built with piezopolymer films of polyvinylidene fluoride (PVDF). The experimental validation showed the directivity diagrams and the ultrasonic guided mode selection were in very good agreement with the simulations. Another outcome of the investigation was the off axis propagation due to the contribution of the bus bars for connecting the IDT fingers to the excitation electronic circuit.

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“…In order to accurately measure ZGV waves, following requirements on the actuators/sensors must be satisfied: (1) the actuators/sensors are sufficiently light so that their effects on the wave propagation are negligible; (2) the actuators/sensors are flexible enough to conform with inspected structures; (3) the actuators/ sensors are capable of exciting and sensing elastic waves at frequencies of ZGV modes. Recent advancements in the piezoelectric film sensors and coatings based on PVDF-TrFE, [28][29][30][31][32][33] which can accommodate above requirements, have opened a novel avenue for the in situ measurement of ZGV waves. With specific fabrication and processing technologies, coatings made of PVDF-TrFE polymers can be polarized and demonstrate a piezoelectric effect which enables its service as actuators and sensors.…”

Section: Introductionmentioning

confidence: 99%

Advancing measurement of zero-group-velocity Lamb waves using PVDF-TrFE transducers: first data and application to in situ health monitoring of multilayer bonded structures

Liu

Guan

et al. 2022

Structural Health Monitoring

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Driven by the rapid advancement in manufacturing technologies, engineering structures with complex geometries are increasingly applied in various industries, posing challenges to the applicability and adaptability of existing structural health monitoring methods based on guided ultrasonic waves. To fulfill the characterization of defects in complex structures, a novel approach featuring a conjunction of zero-group-velocity (ZGV) Lamb waves and polarized poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE) transducers is proposed. In this approach, the PVDF-TrFE solvent is deposited and in situ polarized on the structure surface to form thin and flexible coatings, with which the ZGV waves can be excited efficiently and measured reliably. On this basis, the defect can be characterized by investigating the defect-induced alteration in ZGV wave features. In experimental validations, disbond defects in multilayer bonded structures are evaluated using the ZGV waves measured with fabricated PVDF-TrFE transducers. For the first time, the ZGV waves are measured in a contact and in situ manner. Compared with conventional noncontact measurement of ZGV waves, the proposed approach features a remarkably improved reliability, convenience for narrowband excitation, immunity to measurement uncertainty and capability of in situ monitoring. The proposed approach can advance the ZGV wave-based methods toward the in situ health monitoring and enable the defect evaluation in emerging complex structures.

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Insight into excitation and acquisition mechanism and mode control of Lamb waves with piezopolymer coating-based array transducers: Analytical and experimental analysis

Cited by 8 publications

References 35 publications

Analysis and quantitative identification of guided wave propagation mechanism in concrete

Analysis and quantitative identification of guided wave propagation mechanism in concrete

Design of Piezopolymer Interdigital Transducers with Scaled Electrode Geometries Based on FEM Analysis

Advancing measurement of zero-group-velocity Lamb waves using PVDF-TrFE transducers: first data and application to in situ health monitoring of multilayer bonded structures

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