Denoising of LCR Wave Signal of Residual Stress for Rail Surface Based on Lifting Scheme Wavelet Packet Transform

Li, Peilu; Xu, Chunguang; Pan, Qinxue; Lu, Yuren; Shuangyi, Li

doi:10.3390/coatings11050496

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…In order to effectively reduce the errors caused by different microstructure, Zhu et al [27] proposed the LCR wave attenuation velocity method and applied it to the residual stress assessment of A7N01 welded joint. Li et al [28] proposed an application enhancement scheme of wavelet packet transform to solve the problem of LCR wave signal and noise superposition. And the experimental results show that the proposed method can realize fast calculation and has good anti-noise effect.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Jia,

Lu,

Song

et al. 2024

Preprint

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Thin-walled aerospace parts have the characteristics of large size, thin wall thickness and complex shape, etc. In the process of machining, poor rigidity and high material removal rate are easy to cause machining deformation due to uneven distribution of residual stress, and conventional detection methods and regulation means can not meet the needs of on-site production. In order to solve these problems, an effective method of ultrasonic nondestructive in-situ stress detection and ultrasonic stress regulation is proposed in this paper. Firstly, the ultrasonic residual stress detection and ultrasonic stress regulation are analyzed theoretically, and their working principles are explained, which provides a theoretical basis for the subsequent use of the equipment. Then, according to the deformable sections of large thin-walled parts in the production site, the typical characteristics are extracted to complete the design of the experimental part, and the residual stress detection and regulation of the whole machining process are studied. Finally, through two groups of comparison experiments, the changes of residual stress values in different depth ranges of parts and the changes of the flatness of the final parts are analyzed. The results show that the ultrasonic critical refraction longitudinal wave (LCR wave) method can be used to detect the residual stress of thin-walled parts in different depth ranges, and the ultrasonic stress regulation method can reduce and homogenize the stress of thin-walled parts, and the machining deformation and conformal ability of the parts are significantly improved after the stress regulation.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Jia,

Lu,

Song

et al. 2024

Preprint

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show abstract

“…Egle and Bray [ 25 ] measured acoustoelastic constants for rail steel. Li et al [ 41 ] utilized lifting scheme wavelet packet transform (LSWPT) as a denoising method on L CR wave signals obtained by measuring the residual stress on the rail surface.…”

Section: Introductionmentioning

confidence: 99%

Methodology for Mapping the Residual Stress Field in Serviced Rails Using LCR Waves

et al. 2022

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Non-destructive stress measurement by ultrasonic testing is based on calculating the acoustoelastic modulus obtained from the relationship between material stress and sound wave velocity. A critically refracted longitudinal (L CR ) wave, which is a bulk longitudinal wave penetrating below and parallel to the surface below an effective depth, is most suitable for ultrasonic stress measurement tests because it exhibits a relatively large change in travel time in response to a change in stress. In particular, the residual stress distribution through the thickness of the subject can be calculated if transducers of different frequencies are applied because of the characteristic of propagation to different depths of penetration depending on the frequency. The main purpose of this study was to visualize the internal or residual stress distribution through the thickness of rails using L CR waves. To this end, L CR probes with different center frequencies were designed and manufactured, and the residual stress values of an unused railroad rail and two used railroad rails operated under different conditions were calculated. This was done using the ultrasonic signals received from each probe, of which the distributions were mapped. Through these mapping results, different residual stress values could be calculated according to the depth. The differences in residual stress generation and distribution according to the conditions surrounding the contact between train wheels and rails, and their characteristics, were visualized and analyzed. As a result, it could be concluded that the non-destructive evaluation technique using L CR waves could detect differences in the residual stress of a rail, and thus can be used to measure the residual stress of the rail accurately.

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Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Jia,

Lu,

Song

et al. 2024

Int J Adv Manuf Technol

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Denoising of LCR Wave Signal of Residual Stress for Rail Surface Based on Lifting Scheme Wavelet Packet Transform

Cited by 6 publications

References 25 publications

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Methodology for Mapping the Residual Stress Field in Serviced Rails Using LCR Waves

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

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