return fan and extract fan 回风机和抽风机
Smoke extract fan 排烟风机
kitchen extract fan 橱房抽气装置
·2,447,543篇论文数据，部分数据来源于NoteExpress
In this paper, wavelet packet analysis algorithm is used to extract the characteristics of the cooling fan of inverter and a feature table of typical fault is built.
利用小波包分析算法提取某大型变频器风机的故障特征向量，并构建了典型故障特征表。
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