A wavelet filtering method for cumulative gamma spectroscopy used in wear measurements

Bianchi, Davide; Lenauer, Claudia; Betz, G.; Vernes, A.

doi:10.1016/j.apradiso.2016.11.019

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…There are a few mature gamma spectrum denoising methods, such as the empirical mode decomposition method (EMD) [10], gravity centre method [4], least squares fitting method [11], Gaussian function method [12], sliding average method [3], Fourier transform method [13] and wavelet transform method [5][6][7]. However, most of traditional spectrum denoising methods need the operators to manually operate.…”

Section: Traditional Denoising Methodsmentioning

confidence: 99%

“…Traditional gamma spectrum denoising methods mainly adopt hardware methods and threshold methods, including the sliding average method [3], gravity centre method [4], and wavelet threshold denoising method [5][6][7]. Although the traditional denoising methods are easy to understand and operate, they are susceptible to external factors, and the operator must have some experience in analysis.…”

Section: Introductionmentioning

confidence: 99%

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Segmentation‐enhanced gamma spectrum denoising based on deep learning

Lu,

Zheng,

Liu

et al. 2024

IET Communications

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Gamma spectrum denoising can reduce the adverse effects of statistical fluctuations of radioactivity, gamma ray scattering, and electronic noise on the measured gamma spectrum. Traditional denoising methods are intricate and require analytical expertise in gamma spectrum analysis. This paper proposes a segmentation‐enhanced Convolutional Neural Network‐Stacked Denoising Autoencoder (CNN‐SDAE) method based on convolutional feature extraction network and stacked denoising autoencoder to achieve gamma spectrum denoising, which adopts the idea of data segmentation to enhance the learning ability of the neural network. By dividing the complete gamma spectrum into multiple segments and then using the segmentation‐enhanced CNN‐SDAE method for denoising, the method can achieve adaptive denoising without manually setting the threshold. The experimental results show that our method can effectively achieve gamma spectrum denoising while retaining the characteristics of the gamma spectrum. Compared with traditional methods, the denoising speed and effectiveness have been significantly improved, and the proposed method demonstrates an approximately 1.72‐fold enhancement in smoothing performance than the empirical mode decomposition method. Furthermore, in terms of retaining gamma spectrum characteristics, it also achieves a performance improvement of approximately three orders of magnitude than the wavelet method.

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Section: Traditional Denoising Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Segmentation‐enhanced gamma spectrum denoising based on deep learning

Lu,

Zheng,

Liu

et al. 2024

IET Communications

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“…2.3 Wear measurement 2.3.1 Wear measurementradio isotope concentration method The radioactive isotope concentration (RIC) method (Jech, 2012;Bianchi et al, 2017) was used to measure wear continuously throughout the tests, including running-in and steady-state wear. To determine the amount of wear of the cylinder liner materials, radioactive tracer isotopes were produced within a thin surface layer of the cylinder samples at the designated contact zone.…”

Section: Tribometer Setupmentioning

confidence: 99%

Wear of different material pairings for the cylinder liner – piston ring contact

Wopelka

Cihak-Bayr

Lenauer

et al. 2018

ILT

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Purpose-This paper aims to investigate the wear behaviour of different materials for cylinder liners and piston rings in a linear reciprocating tribometer with special focus on the wear of the cylinder liner in the boundary lubrication regime. Design/methodology/approach-Conventional nitrided steel, as well as diamond-like carbon and chromium nitride-coated piston rings, were tested against cast iron, AlSi and Fe-coated AlSi cylinder liners. The experiments were carried out with samples produced from original engine parts to have the original surface topography available. Radioactive tracer isotopes were used to measure cylinder liner wear continuously, enabling separation of running-in and steady-state wear. Findings-A ranking of the material pairings with respect to wear behaviour of the cylinder liner was found. Post-test inspection of the cylinder samples by scanning electron microscopy (SEM) revealed differences in the wear mechanisms for the different material combinations. The results show that the running-in and steady-state wear of the liners can be reduced by choosing the appropriate material for the piston ring. Originality/value-The use of original engine parts in a closely controlled tribometer environment under realistic loading conditions, in conjunction with continuous and highly sensitive wear measurement methods and a detailed SEM analysis of the wear mechanisms, forms an intermediate step between engine testing and laboratory environment testing.

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