| 小波包分解Welch平均法在焊接电弧声功率谱估计中的应用 |
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| 引用本文： | 马跃洲,张鹏贤,梁卫东,王春柏. 小波包分解Welch平均法在焊接电弧声功率谱估计中的应用[J]. 兰州理工大学学报, 2001, 27(2): 5-8 |
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| 作者姓名： | 马跃洲 张鹏贤 梁卫东 王春柏 |
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| 作者单位： | 甘肃工业大学材料科学与工程学院, |
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| 摘 要： | 对试验系统采集到的焊接电弧声进行了小波包多层分解 ,并利用周期图法、Welch平均法及AR模型法 ,对各频段信号进行功率谱估计 .根据不同谱估计方法的对比结果 ,提出小波包分解结合Welch平均法对焊接电弧声进行功率谱估计的新方法 .通过对几种规范与飞溅率下的电弧声功率谱的初步分析 ,发现其功率谱分布具有一定的规律性 ,并且不同频段谱峰值及其对应频率与焊接飞溅具有相关性
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| 关 键 词： | 焊接电弧声 小波包分解 功率谱估计 周期图法 Welch平均法 AR模型法 |
| 文章编号： | 1000-5889（2001）02-0005-04 |
| 修稿时间： | 2000-09-07 |
Application of wavelet packet analysis and Welch method in power spectrum evaluation of arc sound |
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| MA Yue zhou,ZHANG Peng xian,LIANG Wei dong,WANG Chun bai. Application of wavelet packet analysis and Welch method in power spectrum evaluation of arc sound[J]. Journal of Lanzhou University of Technology, 2001, 27(2): 5-8 |
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| Authors: | MA Yue zhou ZHANG Peng xian LIANG Wei dong WANG Chun bai |
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| Abstract: | The welding arc sound collected by an experimental system is decomposed into multiple layers by means of wavelet packet analysis and the power spectrum evaluation on different frequency bands is conducted by using period map, Welch, and auto regression model methods. According to the results of comparison between these methods of spectrum evaluation, a new method of power spectrum evaluation of welding arc sound is advanced by means of association of wavelet packet analysis with the Welch average method. It is found after preliminary analysis of arc sound power spectrum under different welding conditions and spatter rates that there is a certain regularity with the power spectrum distribution and, moreover, there is a correlation of peak power and its corresponding frequency on different frequency band to the welding spatter. |
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| Keywords: | arc sound wavelet packet analysis power spectrum evaluation period map method Welch average method auto regression model method |
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