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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (13): 262-272.doi: 10.7527/S1000-6893.2022.27919

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Chatter online monitoring of robotic longitudinal⁃torsional ultrasonic edge trimming

Tao WANG1, Xuefeng GAO2, Jinping ZHU3, Song DONG1, Lianjun SUN1, Kan ZHENG1()   

  1. 1.School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
    2.Shanghai Institute of Spacecraft Equipment,Shanghai 200240,China
    3.AVIC Changhe Aircraft Industry (Group) Corporation Ltd. ,Jingdezhen 333002,China
  • Received:2022-08-12 Revised:2022-08-30 Accepted:2022-10-19 Online:2023-07-15 Published:2023-03-21
  • Contact: Kan ZHENG E-mail:zhengkan@njust.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52075265);The Project on the Technological Leading Talent Teams Led by Frontiers Science Center for Complex Equipment System Dynamics(FSCCESD220401)

Abstract:

To address the problem of chatter misjudgment in robotic longitudinal-torsional ultrasonic edge trimming due to isolated information, this paper proposes a chatter monitoring method based on multi-source features fusion. Firstly, the Maximum Correlation Minimum Redundancy (MRMR) algorithm is applied for studying the sensitivity of different features to chatter, and a multi-source feature classification model is constructed. Then, Principal Component Analysis (PCA) is used to fuse the top 3 sensitive features (energy entropy, center of gravity frequency, and waveform factor) into a new chatter feature. Meanwhile, the chatter threshold of the system is determined to be 0.44 based on the PauTa criterion. The robotic longitudinal-torsional ultrasonic edge trimming process is divided into three states: stable, slight chatter and severe chatter. Finally, the online monitoring software of the robotic longitudinal-torsional ultrasonic edge trimming chatter is written to achieve accurate detection and identification of chatter state. Experimental results of this study show that the response time of fused features can be 1.536 s earlier than that of the traditional single feature.

Key words: robotic longitudinal-torsional ultrasonic edge trimming, chattering online monitoring, feature selection, multi-source information fusion, chatter threshold

CLC Number: