Configuration optimization of magnetostrictive transducers for longitudinal guided wave inspection in seven-wire steel strands

Liu, Zenghua; Zhao, Jun; Wu, Bin; Zhang, Yinong; He, Cunfu

doi:10.1016/j.ndteint.2010.05.003

Cited by 61 publications

(38 citation statements)

References 17 publications

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“…It employs two solenoid coils, whereby one supplies a bias static field, and the other either provides a dynamic magnetic field to a waveguide or measures the induced magnetic field through the propagation of elastic waves in the waveguide. MsT applications include dispersion analysis in waveguides [29,30] and defect identification in steel pipes and tubes [31][32][33][34], steel plates with a T joint [35], and steel cables and strands [36][37][38]; a particularly interesting application is condition monitoring of an internal combustion engine [39]. Further developments of MsTs and their characterization were also reported [40][41][42][43][44][45][46][47] including measurement of bending waves or vibrations [48,49] and an attempt at MsT usage in a rotating shaft for crack detection [50].…”

Section: Introductionmentioning

confidence: 99%

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

2015

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A magnetostrictive patch transducer (MPT) is a transducer that exploits the magnetostrictive phenomena representing interactions between mechanical and magnetic fields in ferromagnetic materials. Since MPT technology was mainly developed and applied for nondestructive ultrasonic testing in waveguides such as pipes and plates, this paper will accordingly review advances of this technology in such a context. An MPT consists of a magnetic circuit composed of permanent magnets and coils, and a thin magnetostrictive patch that works as a sensing and actuating element which is bonded onto or coupled with a test waveguide. The configurations of the circuit and magnetostrictive patch therefore critically affect the performance of an MPT as well as the excited and measured wave modes in a waveguide. In this paper, a variety of state-of-the-art MPT configurations and their applications will be reviewed along with the working principle of this transducer type. The use of MPTs in wave experiments involving phononic crystals and elastic metamaterials is also briefly introduced.

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Section: Introductionmentioning

confidence: 99%

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

2015

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“…Electronic mail: bsyoo@umd.edu inspection of cables, pipes, and plates. [4][5][6][7][8][9][10] Nickel and Fe-Co alloy are popular materials for MPT configuration. We have attempted to employ a highly-textured polycrystalline Fe-Ga alloy (Galfenol) patch to develop a unique MPT with directional sensing capability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the use of uniaxial comb-shaped Galfenol patches for a guided wave-based magnetostrictive phased array sensor

Yoo

Pines

2018

AIP Advances

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This paper investigates the use of uniaxial comb-shaped Fe-Ga alloy (Galfenol) patches in the development of a Magnetostrictive Phased Array Sensor (MPAS) for the Guided Wave (GW) damage inspection technique. The MPAS consists of six highly-textured Galfenol patches with a <100> preferred orientation and a Hexagonal Magnetic Circuit Device (HMCD). The Galfenol patches individually aligned to distinct azimuthal directions were permanently attached to a thin aluminum plate specimen. The detachable HMCD encloses a biasing magnet and six sensing coils with unique directional sensing preferences, equivalent to the specific orientation of the discrete Galfenol patches. The preliminary experimental tests validated that the GW sensing performance and directional sensitivity of the Galfenol-based sensor were significantly improved by the magnetic shape anisotropy effect on the fabrication of uniaxial comb fingers to a Galfenol disc patch. We employed a series of uniaxial comb-shaped Galfenol patches to form an MPAS with a hexagonal sensor configuration, uniformly arranged within a diameter of 1”. The Galfenol MPAS was utilized to identify structural damage simulated by loosening joint bolts used to fasten the plate specimen to a frame structure. We compared the damage detection results of the MPAS with those of a PZT Phased Array Sensor (PPAS) collocated to the back surface of the plate. The directional filtering characteristic of the Galfenol MPAS led to acquiring less complicated GW signals than the PPAS using omnidirectional PZT discs. However, due to the detection limit of the standard hexagonal patterned array, the two array sensors apparently identified only the loosened bolts located along one of the preferred orientations of the array configuration. The use of the fixed number of the Galfenol patches for the MPAS construction constrained the capability of sensing point multiplication of the HMCD by altering its rotational orientation, resulting in such damage detection limitation of the MPAS.

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“…In recent years, the giant magnetostrictive (GMS) materials are widely used in many fields and tend to replace the piezoelectric materials due to their advantages of large deformation ratio, high energy conversion rate, rapid response, good reliability, wide bandwidth, and ease to actuate [16,17,18,19,20,21,22,23,24,25,26]. The interpretation of the data obtained from the GMS transducer plays important role in assessing the condition of the tested structures accurately.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Length of Installed Rock Bolt Based on Stress Wave Reflection by Using a Giant Magnetostrictive (GMS) Actuator and a PZT Sensor

Luo

Wang

et al. 2017

Sensors

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Rock bolts, as a type of reinforcing element, are widely adopted in underground excavations and civil engineering structures. Given the importance of rock bolts, the research outlined in this paper attempts to develop a portable non-destructive evaluation method for assessing the length of installed rock bolts for inspection purposes. Traditionally, piezoelectric elements or hammer impacts were used to perform non-destructive evaluation of rock bolts. However, such methods suffered from many major issues, such as the weak energy generated and the requirement for permanent installation for piezoelectric elements, and the inconsistency of wave generation for hammer impact. In this paper, we proposed a portable device for the non-destructive evaluation of rock bolt conditions based on a giant magnetostrictive (GMS) actuator. The GMS actuator generates enough energy to ensure multiple reflections of the stress waves along the rock bolt and a lead zirconate titantate (PZT) sensor is used to detect the reflected waves. A new integrated procedure that involves correlation analysis, wavelet denoising, and Hilbert transform was proposed to process the multiple reflection signals to determine the length of an installed rock bolt. The experimental results from a lab test and field tests showed that, by analyzing the instant phase of the periodic reflections of the stress wave generated by the GMS transducer, the length of an embedded rock bolt can be accurately determined.

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Configuration optimization of magnetostrictive transducers for longitudinal guided wave inspection in seven-wire steel strands

Cited by 61 publications

References 17 publications

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides

Investigation of the use of uniaxial comb-shaped Galfenol patches for a guided wave-based magnetostrictive phased array sensor

Measurement of the Length of Installed Rock Bolt Based on Stress Wave Reflection by Using a Giant Magnetostrictive (GMS) Actuator and a PZT Sensor

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