To extract classification features related to the helicopter rotor structure and motion parameters from radar echoes of the main rotor and hub, this paper proposes a new algorithm of feature extraction in terms of wavelet packet analysis, and carries out the corresponding simulation.

1、

The rotor and the fuselage of the helicopter are mechanically coupled at the rotor hub. A coupled rotor/ fuselage vibration analysis is performed by the matching of rotor and fuselage impedance at the rotor hub.

直升机的旋翼与机身在桨毂处是机械耦合的，用旋翼阻抗和机身阻抗在桨毂处匹配的方法分析旋翼／机身耦合系统的固有特性。

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2、

Install rotor on axle hub.

在车轴轮毂上安装转子。

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3、

A kind of double transverse arm suspending frame guiding mechanism and steering mechanism that employed in outer rotor typed hub motor has been put forward, which could make the four wheel driven electric car to realize a rotation round arbitrary point and to translate along arbitrary direction.

提出了一种用于外转子式轮毂电机的双横臂悬架导向机构和转向机构，可实现四轮驱动电动汽车绕任一点进行旋转，以及沿任一方向进行平移。

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4、

ANSYS FEM used in the stress calculations of blower hub, which overcomes the limit of the classical method on the stress calculation of complicated surface, is an ideal, accurate calculation method for the simulation on the actual operation of rotor blower hub.

采用ANSYS计算汽轮发电机转子风扇座的应力，克服了经典计算方法对复杂变化曲面应力计算的局限性，是较理想地模拟转子风扇座实际运行工况的计算方法。

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5、

The fillet structure decreases the transverse pressure difference near the rotor hub and shroud, and shifts the aerodynamic load to the latter half part of the rotor blade.

倒角结构降低了动叶根、顶处横向压差，气动负荷向动叶栅后半部分转移；

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6、

Stainless laminated strips has usually been selected as a load-bearing structure in main rotor hub and tail rotor hub of a helicopter.

拉扭条结构件是直升机主桨毂、尾桨毂通常采用的一种结构承载受力件。

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7、

The design and manufacture of stainless laminated strips of helicopter tail rotor hub

直升机尾桨毂拉扭条的设计与制造

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8、

Fatigue Design Research on Spherical Flexible Main Rotor Hub of Helicopter

球柔性主桨毂中央件疲劳设计研究

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9、

Over the past several decades there has been an emphasis on simplifying rotor hub designs. The trend is toward lower parts count, weight, drag, and maintenance cost.

在过去的几十年里，直升机旋翼系统的设计领域都强调旋翼桨毂的简单化，总体趋势是降低零部件个数，减少重量，减小阻力和降低维护成本。

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10、

Investigation on the shaft neck fatigue crack of helicopter rotor hub

直升机旋翼桨毂轴颈疲劳裂纹探讨

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11、

Hover over the move map type and drag the handle to the orderInfo parameter.

将鼠标悬停在move映射类型上，并将控制柄拖动到orderInfo参数。

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12、

Hover over any column header, and you will see the sorting icon appear.

把鼠标停留在任何列标题上，就会看到排序图标。

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13、

You can hover over vertical arrows to get details on the locks being held.

你可以循环得到垂直的箭头以获得正在保持的锁的详细信息。

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14、

His job seemed to be to help the teams, but not to hover over them.

他的工作似乎是帮助各个团队，但不凌驾于他们之上。

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15、

Hover over a counter with your mouse to see details about what that counter measures.

在计数器上晃动鼠标可以看到关于该计数器所度量的内容的详细情况。

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16、

Use your mouse to hover over the edge of the ProcessOrder component.

使鼠标悬停在ProcessOrder组件的边缘上。

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17、

To isolate a single web service, hover over the desired item in this list.

若要分离出某个单独的web服务，请将鼠标悬停在此列表中的所需项上。

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18、

Hover over New in the menu.

鼠标悬停于菜单内的New上。

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19、

Finally, numerical simulation shows that it was feasible to hover over space targets in a period of time.

通过数学仿真，验证了在一段时间内对目标卫星实现悬停的可行性。

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20、

You can now hover over images in rich text fields and see the full image preview.

现在，您可以在富文本域中悬浮图像并查看完整的图像预览。

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