Analysis of transient mold friction under different scales based on wavelet entropy theory
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The mold friction (MDF) is an important parameter reflecting the lubrication between the mold and slab quantitatively. The mold/slab friction was detected using an online monitoring system on a slab continuous caster equipped with hydraulic oscillators. Wavelet entropy theory was introduced to describe the fluctuation characteristics of the MDF signal in order to quantitatively estimate the mold/slab lubrication. Furthermore, MDF signal and its wavelet entropy were analyzed under typical casting conditions, such as normal casting, different models (to control the relationship among the amplitude, the frequency and the casting speed), changing casting speeds and breakout. The results showed that the wavelet entropy could accurately reflect the overall changing trend of the mold friction as well as the local variation features. Besides, the wavelet entropy of the hydraulic cylinder force and the MDF was compared and analyzed, and the relationship between them was further discussed.
KeywordsMold friction Wavelet entropy theory Time–frequency analysis Feature extraction Lubrication
The project was supported by the National Natural Science Foundation of China (No. 51204063) and the Anhui Provincial Natural Science Foundation (No. 1308085QE72).
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