基于自适应滤波的电主轴-刀具系统不平衡振动的主动控制

为了有效抑制由质量不平衡引起的电主轴-刀具系统的不平衡振动,本文提出了一种基于最小方差的分块(FBLMS)自适应滤波的电主轴-刀具系统不平衡振动的主动控制方案,该控制方案中用来抑制振动的力源于无轴承电机径向磁悬浮力产生的原理。本文首先研究了双绕组感应型电主轴的结构及工作原理和径向控制力的模型,借助有限元法建立了感应型柔性电主轴-电主轴-刀具系统的动力学模型以及研究了FBLMS自适应滤波控制算法,设计了感应型柔性电主轴-电主轴-刀具系统不平衡振动的主动控制系统,通过有限元法来确定径向控制力的系数以及单边磁拉力的系数,研究了经典PID控制器以及FBLMS自适应滤波控制器对刀具端的不平衡振动的控制效果,结果表明采用FBLMS自适应滤波控制器对抑制电主轴-刀具系统端不平衡振动具有更佳控制效果。

The active control for unbalanced vibration control of electric spindle-tools system based on the FBLMS adaptive filter

To control effectively unbalanced vibration caused by mass unbalance of electric spindle-tools system, the paper proposes a new active control strategy for suppressing grinding electric spindle-tools system unbalance vibration,which bases on the LMS algorithm adaptive filter. Suppressing vibration force in control scheme originates from the principle of a bearingless motor having a radial magnetic force generation. First, the winding arrangement and principle of the induction-type two windings electric spindle and radial control force model are investigated. The dual windings induction-type flexural electric spindle-tools dynamic model is established by finite element and the FBLMS adaptive filter control algorithm is investigated, the coefficients of the control force and unilateral magnetic pull are determined. The tools vibration control effect is investigated by comparing the classic PID controller and FBLMS adaptive filter controller. The results show that the FBLMS adaptive filter controller have a better control effect on suppressing the unbalanced vibration of electric spindle-tools system.