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research-article

Multifractal Detrended Fluctuation Analysis on Friction Coefficient during the Friction Process

[+] Author and Article Information
Guodong Sun

School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
guodongsun@cumt.edu.cn

Hua Zhu

School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
zhuhua83591917@163.com

Cong Ding

School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
dingcong@cumt.edu.cn

Yuankai Zhou

School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003; Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang, 212003
zhouyuankai@just.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4036912 History: Received October 24, 2016; Revised April 19, 2017

Abstract

The dynamic evolutionary law and tribological behavior of tribopair AISI 52100-AISI 1045 was studied via the multifractal method. Friction experiment was performed on a ring-on-disc tribometer under lubrication, and the Multifractal detrended fluctuation analysis (MF-DFA) method was adapted to characterize the multifractality of the friction coefficient. The multifractal spectra first exhibited a left-hook, then right-hook, and left-hook respectively during the friction stages. The multifractal spectrum width W decreases in running-in friction process, maintains at small values in steady friction process, and increases rapidly in increasing friction process. Corresponding shuffled series was analyzed to distinguish that the multifractality of friction coefficient is due to the long-rang correlation of the fluctuations. The results inform quantitative interpretations of friction system's tribological behavior and friction process identification.

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