Design and experiment of array Rayleigh wave-EMAT for plane stress measurement

Li, Haibo; Liu, Tianran; Yang, Peixun; Liu, Yankun; Gao, Sijia; Li, Yapeng; Li, Te; Wang, Yongqing

doi:10.1016/j.ultras.2021.106639

Cited by 11 publications

(2 citation statements)

References 36 publications

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“…The ultrasound energy is mainly concentrated within one wavelength depth under the structure surface. This feature makes Rayleigh waves suitable for the evaluation of surface and near-surface conditions, including nondestructive testing of closed fatigue cracks [1] and surface-breaking defects [2], measurement of material plane stress [3] and nonlinearity [4] etc Electromagnetic acoustic transducers (EMATs) can generate and detect Rayleigh waves on metal samples through the electromechanical coupling. No direct contact with the sample is required for EMATs, making them an ideal solution for some applications that direct coupling can't be achieved, such as high speed scanning of rails [5] and high temperature applications [6].…”

Section: Introductionmentioning

confidence: 99%

Generation of ultrashort Rayleigh wave pulses using the combination of temporal and spatial pulse compression technique

Jiang,

Li,

Wang

2023

Phys. Scr.

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Rayleigh waves generated by electromagnetic acoustic transducers (EMATs) have been widely used in nondestructive testing and evaluations. To improve the signal to noise ratio (SNR) and spatial resolution of Rayleigh waves simultaneously, the combination of temporal and spatial pulse compression (TSPC) technique is proposed. By analyzing the topology diagram of the typical pulse compression technique, a frequency modulated signal acts as the stretcher and a wavelength modulated meander line coil acts as the compressor. Experimental results indicate that the ultrasound fields of Rayleigh waves using the proposed TSPC technique show a spike shape in the spatial domain. Compared with the typical meander-line coil EMATs, the TSPC technique shows significant improvement of the generated Rayleigh waves. The SNR has increased by 12 dB while the main lobe width has decreased by about 98%.

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Section: Introductionmentioning

confidence: 99%

Generation of ultrashort Rayleigh wave pulses using the combination of temporal and spatial pulse compression technique

Jiang,

Li,

Wang

2023

Phys. Scr.

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“…Further, Zha et al [9] designed a fertilizer applicator, which could adjust the amount of fertilizer by adjusting the opening width of the gear wheel, and designed and analyzed each working parameter. Liu et al [10,11] designed a fertilizer device for the cavitation fertilization of granular fertilizer. The fertilizer discharging mechanism of the fertilizer device was mainly composed of the stator and rotor of the fertilizer discharging plate.…”

Section: Introductionmentioning

confidence: 99%

The Design and Experiment of Vertical Variable Cavity Base Fertilizer Fertilizing Apparatus

et al. 2022

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A vertical variable cavity organic fertilizer and compound fertilizer apparatus were designed according to tobacco farming requirements to overcome issues of unstable fertilizer discharge and blocking in the fertilizer disk of an existing fertilizer apparatus. The structure and working principle of the fertilizer apparatus were described. Combined with the principle of anti-arch and the requirements of fertilizer application, the structure size of the fertilizer apparatus was determined. Using the opening degree and rotational speed of the fertilizer disk as the test factors and the fertilizer rate and variation coefficient of fertilizer application rate as the indices, the EDEM was used to conduct the single factor test and obtain the appropriate rotational speed range. The results indicated that the variation coefficient of the fertilizer uniformity apparatus was 0.96–5.22% under different rotation speeds and fertilizer disk openings, which satisfied design requirements. The orthogonal experiment explored the interaction between rotational speed and the opening. The influence of the opening adjustment on the fertilizer application rate and the coefficient of variation of uniformity were greater than the change in fertilizer disk speed. The bench and field tests aligned with the simulation test. These findings provide a reference and theoretical basis to design a fertilizer apparatus.

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