Timely chatter identification for robotic drilling using a local maximum synchrosqueezing-based method

Jianfeng Tao (), Chengjin Qin (), Dengyu Xiao (), Haotian Shi (), Xiao Ling (), Bingchu Li () and Chengliang Liu ()
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Jianfeng Tao: Shanghai Jiao Tong University
Chengjin Qin: Shanghai Jiao Tong University
Dengyu Xiao: Shanghai Jiao Tong University
Haotian Shi: Shanghai Jiao Tong University
Xiao Ling: Shanghai Jiao Tong University
Bingchu Li: University of Shanghai for Science and Technology
Chengliang Liu: Shanghai Jiao Tong University

Journal of Intelligent Manufacturing, 2020, vol. 31, issue 5, No 12, 1243-1255

Abstract: Abstract Induced by flexibility of the industrial robot, cutting tool or the workpiece, chatter in robotic machining process has detrimental effects on the surface quality, tool life and machining productivity. Consequently, accurate detection and timely suppression for such undesirable vibration is desperately needed to achieve high performance robotic machining. This paper presents a novel approach combining the notch filter and local maximum synchrosqueezing transform for the timely chatter identification in robotic drilling. The proposed approach is accomplished through the following steps. In the first step, the optimal matrix notch filter is designed to eliminate the interference of the spindle frequency and corresponding harmonic components to the measured acceleration signal. Subsequently, the high-resolution time–frequency information of the non-stationary filtered acceleration signal is acquired by employing local maximum synchrosqueezing transform (LMSST). On this basis, the filtered acceleration signal is divided into a finite number of equal-width frequency bands, and the corresponding sub-signal for each frequency band is obtained by summing the corresponding coefficient of the LMSST. Finally, to accurately depict the non-uniformity of energy distribution during the chatter incubation process, the statistical energy entropy is calculated and utilized as the indicator to detect chatter online. The effectiveness of the proposed approach is validated by a large number of robot drilling experiments with different cutting tools, workpiece materials and machining parameters. The results show that the presented local maximum synchrosqueezing-based approach can effectively recognize the chatter at an early stage during its incubation and development process.

Keywords: Robotic drilling; Chatter identification; Optimal matrix notch filter; Local maximum synchrosqueezing-based method; Time–frequency information; Energy entropy (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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DOI: 10.1007/s10845-019-01509-5

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