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首页> 美国卫生研究院文献>Micromachines >Friction Reduction for a Rotational Gyroscope with Mechanical Support by Fabrication of a Biomimetic Superhydrophobic Surface on a Ball-Disk Shaped Rotor and the Application of a Water Film Bearing
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Friction Reduction for a Rotational Gyroscope with Mechanical Support by Fabrication of a Biomimetic Superhydrophobic Surface on a Ball-Disk Shaped Rotor and the Application of a Water Film Bearing

机译：机械支撑旋转陀螺仪在球形盘形转子上仿生超疏水表面的减摩及水膜轴承的应用

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摘要

Friction between contacting surfaces of metal materials restricts the application of mechanical support in the high-precision inertial device of a rotational gyroscope. Instead, a disk- or ring-shaped rotor is electrostatically or magnetically suspended. However, stability of the rotor suspension restricts further improvement of the measurement precision. In the developed rotational gyroscope, a stable mechanical rotor supporting scheme with low friction is achieved by fabrication of a superhydrophobic surface with similar nanostructures of the lotus leaf on the carbon steel ball of the ball-disk-shaped rotor and the addition of a water film between the rotor ball and bronze hemispherical supporting bowl, which forms a water film bearing. The special design of the ball-disk-shaped rotor makes it possible for the application of a low-friction water bearing in the gyroscope, with rotor tilting motion. With a superhydrophobic surface, friction is further decreased and the rated spinning speed increases 12.4%, resulting in approximately the same proportion of increase in the scale factor. Moreover, superhydrophobic surface reduces mechanical damping torque for precessional motion to one order smaller than electrostatic feedback torque. Thus, through close-loop control, stable damping characteristics for precessional motion are obtained. The gyroscope exhibits excellent performance with the parameters of the measurement range, scale factor, nonlinearity, resolution, bias stability, and dynamic setting time tested to be −30°/s to 30°/s, −0.0985 V/(°/s), 0.43%, 0.1°/s, 0.5°/h, 0.1 s, respectively.
机译：金属材料的接触表面之间的摩擦限制了机械支撑在旋转陀螺仪的高精度惯性装置中的应用。而是将盘形或环形的转子静电或磁悬浮。但是，转子悬架的稳定性限制了测量精度的进一步提高。在已开发的旋转陀螺仪中，通过在球形盘状转子的碳钢球上制造荷叶纳米结构相似的超疏水表面并添加水膜，可实现低摩擦的稳定机械转子支撑方案。转子球和青铜半球形支撑碗之间形成一个水膜轴承。球形盘形转子的特殊设计使其可以在陀螺仪中应用低摩擦的水轴承，并具有转子倾斜运动。在超疏水表面上，摩擦力进一步降低，额定纺丝速度提高了12.4％，导致比例因子的增加比例大致相同。而且，超疏水表面将进动运动的机械阻尼扭矩减小到比静电反馈扭矩小一阶。因此，通过闭环控制，可获得用于进动的稳定的阻尼特性。陀螺仪在测量范围，比例因子，非线性，分辨率，偏置稳定性和动态设置时间等参数方面表现出出色的性能，测试范围为−30°/ s至30°/ s，-0.0985 V /（°/ s）分别为0.43％，0.1°/ s，0.5°/ h，0.1 s。

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