A methodology based on empirical mode decomposition and synchrosqueezed wavelet transform for modal properties identification and damage detection

Sanchez, Wilson D.; Ávila, Suzana Moreira; Brito, Jose V. de

doi:10.1007/s40430-022-03818-y

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…Similarly, making m = m + 1 and repeating the above calculation yields φ m+1 . Finally, the approximate entropy is defined as the difference between φ m and φ m+1 , as shown in Equation (10):…”

Section: Coefficient Of Variation and Approximate Entropy Of Ipeimentioning

confidence: 99%

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Stability Analysis of Metal Active-Gas Welding Short-Circuiting Transfer Based on Input Pulsating Energy

Lv,

He,

2024

Materials

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In this study, a platform for a welding experiment, used to collect input and output electrical signals, was constructed, and the algorithm for the input pulsating energy interpolation line (IPEI) was given. Experiments with MAG surface straight line welding were conducted at various voltages. Analysis of the IPEI in relation to the welding current was performed while combining real-world welding occurrences with high-speed camera images of droplet transfer. It was established that the IPEI can be employed as a characteristic parameter to assess the stability of the short-circuiting transfer process in MAG welding. The three criteria for assessing the stability were the spectrum, approximation entropy, and coefficient of variation. A comparative analysis was conducted on each of these approaches. It was determined that the most effective technique is approximation entropy. The approximation entropy of the welding current and IPEI are also highly consistent, with a correlation coefficient as high as 0.9889.

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Section: Coefficient Of Variation and Approximate Entropy Of Ipeimentioning

confidence: 99%

“…A welding electrical signal is a nonsmooth signal. Time-frequency analysis is one of the best and most accessible analytic techniques for nonsmooth signal processing [10]. Kaur [11] used a two-slit probe measuring device to measure the beam current, which was then processed by Discrete Wavelet Transformation (DWT).…”

Section: Introductionmentioning

confidence: 99%