讨论了基于高分辨距离像(hrrp)的目标长度特征提取原理。

The basic theory of extraction of target projection length using high resolution range profile (HRRP) is discussed.

youdao

在考虑管道长度特征的前提下，把管道近似地看作长梁或薄壳，然后以“含裂纹零维度单元”模型（即垂直于裂纹面方向的单元尺度为零）计算出裂纹对管道动态特性的影响。

This paper treats a pipe as a beam or as a thin shell. Then, the effect of cracks on the dynamic characteristics of pipes is calculated by means of the model of zero dimension element with crack.

youdao

他分析了鸣叫声的特征，包括每支“曲子”的发音次数——或者说音节、音节的长度以及鸣声频率。

He analysed the songs' traits, including the number of single sounds - or syllables - per song, the length of the syllables and the song's frequency.

youdao