Change monitoring of earth rotation parameter with Maglev gyroscope precessional torque

Through analyzing the relationship between gyro dynamic torques produced by the changes of earth rotation parameters (ERP), a method of measuring the earth rotation parameters was proposed and explored by using gyroscope. The preliminary experiments were carried out using GAT Maglev Gyro Station (which is self-developed by China). Considering the measurement and expanding-application of the earth rotation parameters, some ideas and opinions about the structure design, measurement methods and data processing of gyro were proposed, and some outlook of the expanding-application of the gyroscope in geodetic and geophysical fields were done. The experimental results show that using the high-precision gyroscope to determine the changes of ERP is feasible, with the emergence of ultra-high precision gyro; it is possible for determining the earth rotation parameters by gyro in stead of by current complex space surveying technology.

转子进动定理的扩充和完善

为更深入地揭示转子进动的轨迹特征,提出了关于转子进动轨迹的2个定理。定理1表明,转子进动的任一阶轨迹分量所围面积可直接由同阶频率成分构成的轨迹方程系数矩阵行列式求得。定理2证明,转子进动轨迹矢径在单位时间内所扫过的面积是恒定的,而与起始点无关。同时,提出了欧拉复向量的内积法则,即2个欧拉复向量的内积等于2个复向量的幅值与欧拉角之差的余弦三者之积,且符合交换律。利用2个定理和内积法则对转子进动理论进行了补充和完善。结果表明,在转子的运动中,作用力所做的功关于转子的进动是正交的。所得结论对于揭示转子的进动规律和机理、诊断转子故障具有参考价值。

早期碰摩故障下转子进动信号变化规律的仿真分析

针对早期碰摩时转子振动特征与其它旋转机械常见故障(如不对中)特征相重复的问题,研究转子进动信号中蕴含的早期碰摩故障特征。建立了转子动力学模型并求解得到仿真转子振动信号,从中计算出4项转子进动信号(公转半径、径向运动速度、公转转速、公转加速度)并进行了分析。结果表明发生早期碰摩时,转子进动信号的波动幅度会急剧加大,其中公转加速度信号会在碰摩点处发生瞬间剧烈波动,可用来指示碰摩部位;频谱中高阶倍频成分大大增加,大部分情况下高阶倍频代替转频成为主要成分。这些特征与正常状况有显著区别,可望用于碰摩故障的诊断。

SS433在进动不稳定情形下的拍现象及多普勒频移残差的轮廓分布

本文得出了SS433在进动不稳定情形下,章动所引起的短周期变化中仍存在拍现象.并考虑到章动和进动不稳定性两种因素的共同影响,计算出了残差(Z-(?))分布的理论曲线,用计算机作出轮廓图,与由观测点偏离拟合进动曲线的残差分布轮廓图比较吻合得较好.