论文部分内容阅读
为保证静电悬浮微陀螺在工作状态下具有期望的动态特性,需要得到微陀螺六自由度运动的空气阻尼模型。根据流体力学和分子动力学的基本理论,在考虑空气流动状态、温度和气膜可压缩性的基础上,构建了描述微陀螺压膜阻尼特性的Reynolds方程,以及描述滑膜阻尼特性的Couette流模型。将微陀螺表头内部气膜分成了8个区,推导了气膜在大间隙振动、径向摆动和轴向旋转时的气膜阻尼系数。根据微陀螺的结构参数进行气膜阻尼仿真,结果表明:轴向压膜阻尼对微陀螺支承系统的动态特性影响最大,气膜间隙-气膜阻尼系数曲线呈抛物线型,气膜阻尼系数随温度呈线性变化。
In order to ensure that the electrostatic suspended micro-gyroscope has the desired dynamic characteristics under the working condition, an air damping model of the micro-gyro six-degree-of-freedom motion needs to be obtained. According to the basic theory of fluid mechanics and molecular dynamics, Reynolds equations describing the damping characteristics of the micro gyro membrane and the Couette flow model describing the damping characteristics of the synovial membrane were constructed based on the air flow state, temperature and the compressibility of the membrane. . The gas film inside the micro-gyro head is divided into 8 zones, and the damping coefficient of the gas film during the vibration, radial swing and axial rotation of the large gap is deduced. According to the structure parameters of micro-gyroscope, the simulation of the air-film damping is carried out. The results show that the axial compression-damping has the greatest influence on the dynamic characteristics of the micro-gyroscopic support system. The curve of the film-air-film damping coefficient is parabolic, A linear change.