铅垂面

该机械臂附加有约束层和粘弹性材料层在铅垂面内转动，末端承受一集中质量。

The manipulator rotates in a vertical plane and carries an end mass .

针对座椅在铅垂面内弹射的简化模型，建立了系统的非线性运动方程；

A series of nonlinear dynamic equations of ejection seat are derived according to simplified model which is established in the vertical plane .

CCD光靶的原理是利用两个线阵CCD相机作为探测器组成光学成像系统，其主光轴在铅垂面内交汇构成虚拟靶面，该光靶的核心部分是CCD数据采集系统。

The principle of CCD optical target is that 2 linear-array CCD cameras are used as detecting devices to compose optical imaging system and its main light-axis is crossing in vertical-side to compose virtual target screen , whose core part is CCD data acquiring system .

在同一铅垂面内，当视线在水平线上方时，视线与水平线的夹角。

Trying on drilling with high water level and large elevation angle ;

当瞄准镜光轴与枪膛轴线不在同一铅垂面内时，对武器射击精度有影响。

Improving the firing accuracy is the final aim in the structural optimization of machine guns .

涡流比太大，铅垂面内的湍流或滚流太弱，会削弱喷雾射流对燃烧室底部空气的卷吸，降低燃烧室底部的空气利用率。

If the swirl ratio is too high , and the turbulence or tumble in the vertical plane is too weak , the entrainment of the spray jet to the air at the bottom of the combustion chamber will be impaired , and the air utilization ratio will be reduced .