负角

零角动量的曲线把物质的流动分成两个正角动量区和两个负角动量区。

The lines of zero angular momentum separate the flow into two areas of negative and two areas of positive angular momentum .

根据其造成差异的原因，在高强度钢板零件容易发生的纵向回弹和负角问题方面，对补偿算法进行了修正。

Considering the longitudinal springback and undercut compensation problems occur easily in HSS , the compensation algorithm is corrected based on the different reasons .

模拟结果表明：对成形部位有一定冲压负角的车门外板及型面有较深沟槽的前翼子板，在合理的液室压力加载路径下，充液拉深成形具有良好的成形性。

The results shows that hydro-mechanical deep drawing has excellent performances for the outdoor plate with stamping undercut and the front fender with relatively deep groove , under the reasonable chamber pressure loading path .

结果表明，GT修齐的砂轮与理想砂轮相比，磨粒出刃高度、出刃体积和磨粒后角的平均值要小，但是，磨粒切削负前角要大。

The results show that average values of grain protrusion height , grain protrusion volume and clearance angle of truncated grinding wheel are smaller than the ones of ideal grinding wheel , but the grain rake angle of truncated grinding wheel is larger .

一种负承载角特殊管接头的螺纹加工工艺

A Threading Process for Negative-supporting-thread Premium Connection

负前角磨粒磨削过程磨屑形成的有限元仿真分析

Finite element analysis of grinding chip formation of single abrasive grain with negative rake angle

论述了径向负前角硬质合金滚刀的设计及切削条件。

Design and cutting condition of carbide hob with radial negative front angle were discussed .

负前角锥形前刀面硬齿面插齿刀构形误差分析

Analysis of Profiling Errors for Negative Rake Conical Face Shaping Cutter for Cutting Hardened Face Gear

不同负冲角工况下透平叶栅二次流的数值模拟及分析

Numerical simulation and analysis of secondary flows in a turbine cascade under large and small negative incidences

进口气流对静叶有较大的负冲角，在改进设计中应该改善动、静叶之间的匹配。

Because of large negative incidence in inlet the of stator , rotor and stator matching should be improved in design .

负前角增加会促进非晶化相变，并使得材料倾向于向刀具两侧流出。

Larger negative rake angle leads to greater amorphous phase transformation and forces more material to flow towards the two sides of the cutter .

可测量的位置参数有切削齿复合片的圆心坐标及负前角、侧偏角等。

Measurable parameters include the coordinates of the circle center of the cutter teeth compact and the compact 's back rake angle and side sway angle .

在齿形设计方面，引入双参数造形法，从而提高了负前角滚刀的造型精度；

Design the respect in the tooth shape , introduce the shaping law of a pair of parameters in the shape design of tooth of hobbing cutter ;

为提高硬质合金插齿刀的抗崩刃能力，需要采用负前角的特殊设计；

There is a special way of design of carbon alloy slotting tool which has minus rake angle to increase the ability of resisting the tooth edge collapse .

引起特高压输电线路雷击故障的主要因素是雷电绕击，建议特高压输电线路采用负保护角运行。

The principal cause of lightning stroke failures occurred in UHV transmission lines is the shielding failure , so it is suggested to adopt the negative protecting angle for UHVDC transmission lines .

这种误差影响了齿形精度，特别是负前角插齿刀，现行的设计方法不能满足齿形精度。

This error has influenced the precision of gear , especially , when negative rake angle of gear-shaped cutter is used , the current design method has not reguired the profile precision .

数值分析结果表明：采用标准κ-ε模型进行计算时，在较大负冲角工况下，不能在叶栅压力面前缘预测到分离的产生；

Results of numerical analysis show that , under large negative incidence angle flow conditions , separation at leading edge 's pressure surface can not been predicted by means of κ - ε models .

本文还介绍了为提高复合片钻头经济指标的诸钻头参数设计的理论根据，如负前角、旁通角、出露高度、复合片布置等等。

The present paper also introduces the theory for the design of bit parameters in order to improve the economic target , such as negative rake angle , bypass angle and the exposure height .

对前者的研究表明，车轮以正冲角脱轨所需的横向力要远小于负冲角时。

The studies on the former case show that the lateral force to derail a wheel in positive angle of attack is much less than that to derail a wheel in negative angle of attack .

试验采用简化的飞机模型（有尾翼），建立了包含一对翼尖涡及一对反向旋转的尾翼涡（通过以负迎角安装尾翼得到）的4涡尾流系统。

In the experiment , a simplified aircraft model ( with tail wing ) is employed to construct a4-vortex wake system consisting of a pair of tip vortices and a pair of counter rotating tail plane vortices .

对于山区，因地形影响（山坡、峡谷），避雷线的保护可能要取负保护角，这些有待于进一步研究，从而保证我国特高压输电线路具有较好的雷电性能。

For mountainous areas , because of the influence of landform , especially hilltop and gorge , shielding angles may be negative angle , which needs further research to ensure the great lightning performance of UHV overhead transmission lines in China .

分析讨论了导叶流道内流速突变，以及由于流速高、来流为负冲角等因素使汽蚀发生及发展，产生快速破坏。

Analysis and discussion of the damage factors are given , prompt changes of the channel current , the sudden changes of the gate vane , the current angle , and the coming current with a negative angle of attack , and others .

负前角硬质合金齿轮滚刀具有曲线刀刃，提高其齿形精度保持性比具有直线刀刃的普通齿轮滚刀更复杂、更困难。

As the carbide gear hob with negative rake angle is of the curve edge , it is more complicated and difficult to increase the accuracy life of the tooth profile of this kind of hob than that of the standard gear hob with straight edge .

针对Lockheed-AFOSRWingB的亚临界和超临界算例结果表明，厚度的非线性分布和负的扭角会改善机翼流场的流动状态，使机翼的升阻比得到提高，优化设计方法是可行的。

The subcritical and supercritical computation of Lockheed-AFOSR wing B cases show that nonlinear distribution of thickness and negative twist angle could ameliorate the condition of flow field around the wing , which leads to higher lift-to-drag ratio , the optimization method is effective .

用电镜负染技术观察角蛋白细丝并测定其直径为80～100A。

Under negative staining electron microscopy , the keratin was a filament with a diameter of 80-100A .

负双轴晶体光轴角和光线轴角推导的新方法

New inference method of the optic axial angle and the ray axial angle of the negative biaxial crystal

各向异性强的晶体实现负折射的入射角范围可能会很大。

For strong anisotropy crystal , the maximum incident angle that yields the negative refraction could be very large .

通常从一介质进入到另一介质时光束具有正折射角，但在负折射介质中它具有负折射角。

On entering another medium from one medium , light usually refracts with a positive angle . However , negative refractive media ( NRM ) may produce negative refraction , i.e. light refracts with a negative angle .