精密离心机动平衡新方法的研究

New method of dynamic balance of precision centrifuge

为了减小动不平衡对惯导用精密离心机工作半径允差的影响 ,提出了硬支承外盘刚性转子动平衡的一种新方法 .精密离心机动平衡系统由 2个测试面 (每个测试面上放置 2个电容测微仪 )、2个校正面 (每个校正面上放置 4个由步进电机驱动的可移动的平衡块 )及测角元件组成 .移动平衡块设置一个新的静不平衡 ,根据振动矢量幅值的变化 ,确定静不平衡的相位及大小 ,移动平衡块消除静不平衡 .此时能够直接测得偶不平衡的相位 ,移动平衡块设置一个新的偶不平衡 ,根据振动矢量幅值的变化 ,确定偶不平衡的大小 ,移动平衡块消除偶不平衡 .应用计算机 ,从数据采集、处理到控制动平衡执行机构 ,实现了精密离心机现场高精度高效率调平衡的自动化 .

A new method of dynamic balance for a solid rotor supported by stiff supporting is proposed to diminish the impact of dynamic unbalance in the precision centrifuge used for inertial navigation with the permitted error of working radius. The system consists of two measurement planes mounted on two capacitance displacement instruments, two correcting planes mounted on four movable balance blocks driven by stepping motors, and angle measuring units. Setting a new unbalance by moving balance blocks, the amplitude and the phrase of the unbalance are then determined by vibration vector modification, and the unbalance is eventually diminished by the moving blocks. In the meantime, the phase of couple unbalance is directly measured, setting a new couple unbalance by moving the blocks, while the couple unbalance is determined by the modification of vibration vectors and the coupled unbalance is also diminished by moving the blocks. The acquisition, processing and controlling of data in the executive mechanism are controlled by computer, and thus the high-efficiency and high-precision automation of the on-the-spot dynamic balance of precision centrifuge is realized.