1) axis of a pencil of planes
平面束的轴
2) semimajor axis of beam cross-section
束流截面的长半轴
3) constraint plane
约束平面
4) collimated beam of sound
平面波束
1.
On the base of the Westervelt equation, this paper studied the acoustic field of the second harmonic of a collimated beam of sound, in particular the directional characteristics.
以Westervelt方程为理论基础,推导了平面波束二次谐波的声压和声强分布,得出平面波束的二次谐波的指向特性主要与波束的尺寸和波长的相对比值、波束的频率有关,高频时也会有旁瓣出现,但在所有频率范围以内都有较尖锐的指向特性。
5) pencil of planes
平面束
1.
Its main ideas are as follows: (1) dividing the quartic implicit algebraic surface into several patches; (2) computing the intersection curves of each surface patch with a pencil of planes rotated successively along a certain fixed axis; (3) parametrizing the curves.
首先对四次代数曲面进行分片 ,然后对每一个分片曲面利用一组同轴平面束与其求交线 ,通过对求得交线的参数化来完成对整个分片曲面的参数化 。
6) planar constraint
平面约束
1.
In a narrow plot,ground can be hypothesized a planar plane,so the planar constraint can be used to acquire planar points.
介绍了一种利用平面约束条件对LIDAR点云数据进行滤波的方法,利用每个数据点的邻域点拟合平面,根据平面约束条件和平面点分类方法得到地面点,最后利用地面点内插该区域的DTM。
补充资料：束流
1.狭窄的水流。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条