同时，对小波变换后管壁内、外表面局部缺陷信号的特征进行分析，探讨了基于小波变换的内、外表面局部缺陷的分类方法。
The difference of signals derived from the outside flaw and the inside flaw is analyzed, and the flaw recognition method is also discussed based on wavelet analysis.
介绍了避免无填料和衬芯的长矩形管弯曲成形后管壁出现内陷及折痕的工艺，模具结构特点及设计中注意的事项，模具结构合理，便于加工、装配及使用。
The technology to avoid the dishing and folding of pipe shell appearing at the bending of long rectangular non-stuffing and coreless tube was introduced.
通常，对流换热系数是在实验中以电加热试验管壁面后根据牛顿冷却定律计算得来的。
Normally, coefficient of convective heat transfer is gotten through experiments which is heating testing tube by electricity and computed through Newton cooling law.
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