电主轴-刀具系统不平衡振动的主动控制

摘要

A new active control strategy for suppressing unbalanced vibration of grinding electric spindle-tool system is proposed to effectively control unbalanced vibration caused by mass unbalance of electric spindle-tool system. First, the winding arrangement and the induction principle of electric spindle with two windings and the radial control force model were investigated. The dynamic model of flexible electric spindle-tool with two induction windings was established by Finite Element Method and the FBLMS adaptive digital filter control algorithm was investigated. The test system was designed. By using FEM the coefficients of the control force and unbalanced magnetic pull were determined. The vibration control effect of the tool was studied by comparing the classic PID and FBLMS adaptive filter controller. The results show that the FBLMS adaptive digital filter controller has a better control effect on suppressing the unbalanced vibration of electric spindle-tool system.%为了有效抑制由刀具的质量不平衡引起的电主轴系统不平衡振动,提出了一种电主轴系统不平衡振动的主动控制方案,首先研究了双绕组感应型电主轴的结构、工作原理及径向控制力模型,借助有限元法建立了感应型柔性电主轴系统的动力学模型以及研究了FBLMS(Fast Block Least Mean Square)自适应滤波控制算法,设计了感应型柔性电主轴-刀具系统不平衡振动的主动控制系统,通过有限元法确定了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不平衡振动的控制效果,结果表明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.