An Optimal Weighted Wavelet Packet Entropy Method With Application to Real-Time Chatter Detection

An Optimal Weighted Wavelet Packet Entropy Method With Application to Real-Time Chatter Detection
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一种应用于实时颤振检测的最优加权小波包熵方法

DOI:
10.1109/tmech.2016.2547481
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发表时间:
2016-03
影响因子:
6.4
通讯作者:
Xiong Zhenhua
Xiong Zhenhua
中科院分区:
工程技术1区
文献类型:
--
作者:
Sun Yuxin;Xiong Zhenhua

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颤振检测对于防止加工过程中颤振产生的有害影响,提高生产率和零件质量具有重要意义。颤振导致频域中能量分布的均匀性降低。这种均匀性变化可以通过加权小波包熵(WWPE)来捕捉。本文提出了一种用于实时颤振检测的最优WWPE方法。我们研究了最优权值,使稳定状态和颤振状态之间的相对距离在WWPE上最大化。提出了一种视觉极值统计方法,通过对分布尾部进行建模,计算出理论上严格的阈值。该方法利用小波包矩阵实现了毫秒级的计算效率,适合于实时应用。最后,通过加工实验得出了最优权重,验证了所提方法的有效性。
Chatter detection is important for preventing harmful effects induced by chatter in machining processes, and for improving productivity and part quality. Chatter leads to decreased uniformity of energy distribution in the frequency domain. Such uniformity variation can be captured by the weighted wavelet packet entropy (WWPE). In this paper, an optimal WWPE method is proposed for a real-time chatter detection. We investigate the optimal weight, with which the relative distance between stable and chatter states is maximized in terms of the WWPE. Extreme value statistics with a visual method is proposed to compute a theoretically rigorous threshold by modeling tails of the distribution. Using the wavelet packet matrix, the proposed method achieves computational efficiency in milliseconds, and is thus suitable for real-time applications. Finally, machining experiments are conducted to derive the optimal weight and verify the effectiveness of the proposed method.
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发表时间: 2005-12
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