基于VMD和FFT的变切深侧铣颤振特征提取方法

doi:10.12068/j.issn.1005-3026.2018.08.018

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (8): 1153-1157.DOI: 10.12068/j.issn.1005-3026.2018.08.018

基于VMD和FFT的变切深侧铣颤振特征提取方法

刘长福¹，朱立达¹，仇健²，李明¹

(1. 东北大学机械工程与自动化学院，辽宁沈阳110819; 2. 沈阳机床集团有限责任公司高档数控机床国家重点实验室，辽宁沈阳110142)

收稿日期:2017-04-21 修回日期:2017-04-21 出版日期:2018-08-15 发布日期:2018-09-12
通讯作者: 刘长福
作者简介:冯明杰(1971-)，男，河南禹州人，东北大学副教授; 王恩刚(1962-)，男，辽宁沈阳人，东北大学教授，博士生导师.刘长福(1986-)，男，内蒙古赤峰人，东北大学博士研究生; 朱立达(1979-)，男，吉林长春人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51171041).国家自然科学基金资助项目(51475087).

Chatter Feature Extraction Method in Variable Cutting Depth Flank Milling Based on VMD and FFT

LIU Chang-fu¹， ZHU Li-da¹， QIU Jian²， LI Ming¹

1. School of Mechanical Engineering & Automation， Northeastern University， Shenyang 110819， China; 2. State Key Laboratory of High Grade NC Machine Tools， Shenyang Machine Tool

Received:2017-04-21 Revised:2017-04-21 Online:2018-08-15 Published:2018-09-12
Contact: ZHU Li-da
About author:-
Supported by:
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摘要/Abstract

摘要： 针对铣削过程中颤振频带不明显的问题，采用变分模态分解(VMD)和快速傅里叶变换(FFT)相结合的方法来提取颤振频带，为进一步提取颤振特征值奠定基础.为获得包含颤振频率的频带，采用变切深侧铣薄壁件实验获取铣削力信号.提出结合FFT频谱来选择VMD中模态个数的方法，并采用此方法对仿真信号和实验信号进行颤振频带提取，结果表明VMD和FFT相结合的方法能有效提取铣削颤振频带.

关键词: 侧铣颤振, 特征提取, 变分模态分解, 变切深, 薄壁件

Abstract: A chatter frequency band extracting method combining the variational mode decomposition (VMD) and fast Fourier transform (FFT) was proposed for extracting the obscure chatter frequency band in milling process， making good basis of further extracting the chatter feature value. To obtain the frequency band including chatter frequency， the variable cutting depth flank milling experiment was carried out and the forces were measured in the experiment. A method of choosing the number of modes in the VMD by combining the FFT spectrum was proposed. The simulation signal and experiment signal were extracted by the above method. The results show that the method of combining the VMD and FFT can effectively extract the chatter frequency bands in milling， which offers a new method to extract the chatter feature.

Key words: chatter in flank milling, feature extraction, VMD, variable cutting depth, thin-walled workpiece

中图分类号:

TH17

刘长福，朱立达，仇健，李明. 基于VMD和FFT的变切深侧铣颤振特征提取方法[J]. 东北大学学报:自然科学版, 2018, 39(8): 1153-1157.

LIU Chang-fu， ZHU Li-da， QIU Jian， LI Ming. Chatter Feature Extraction Method in Variable Cutting Depth Flank Milling Based on VMD and FFT[J]. Journal of Northeastern University Natural Science, 2018, 39(8): 1153-1157.

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基于VMD和FFT的变切深侧铣颤振特征提取方法

Chatter Feature Extraction Method in Variable Cutting Depth Flank Milling Based on VMD and FFT

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