建立了考虑刀杆柔性的球头铣刀铣削振动模型，探讨了交变轴向力对刀杆固有频率的影响。考虑刀具动态变形和工件表面波纹对切削厚度的再生反馈，建立了球头刀铣削动力学模型，对铣削中的动态铣削力和刀杆振动进行了仿真，证明了离线仿真可以对铣削过程动特性做出预测。

将一类平面磨床主轴系统简化为耦合双弹性梁结构，用模态综合法建立其动力学模型。据此，考虑实际工况，设计主轴系统动力减振器。模拟仿真和试验结果表明，在系统加入动力减振器后，主轴末端振动幅值可得到有效减小。

In order to achieve active control for improved machining accuracy and efficiency, the control commands will include a substantial amount of high frequency signals. The high frequency command signals may not be sufficiently implemented by the single actuating unit that is the wheel infeed system. To solve this problem, an additional actuating unit will be required to support the workpiece in order to implement small but fast control actions. A high performance workpiece micro-positioning table utilizing a piezoelectric translator under preloaded Hertzian contact has been developed and experimentally tested. The table has shown to have a high resolution of better than 20 nm and a high natural frequency of approximately 579.2 Hz. When implementing a 43.587 ~tm step motion, the acceleration could be up to 33.5 l g, where g is acceleration due to gravity. It is found that when large step commands are applied, the workpiece table would exhibit excessive overshoot due to the separation between the piezoelectric translator and the moving part of the table. This would cause large shock accelerations, seriously affecting the machining accuracy. Dynamic models have been established to describe the table-top motions and the occurrence of the separation, which should be significant due to the wide use of the design of preloaded Hertzian contact. The models have not been examined systematically using an experimental approach. The micro positioning table is briefly introduced and the velocity and acceleration models of the table are presented. Experimental results are analyzed to verify the established models and to validate the findings about the separation. The average modeling error was found to be less than 3 %. This gives confidence in using the system for the fast active control required in high speed machining processes.

为提高铣削加工的安全性和生产效率，有必要在加工实际进行之前准确地预测切削过程的物理信息，如铣削力、刀具振动等。给出了球头铣刀刃线几何模型，采用理论切削力分析与实验—系数识别相结合的方法建立了新的螺旋刃球头铣刀的铣削力模型。对不同切削条件下的铣削力进行了仿真，与实验测量数据吻合良好，证明离线仿真可以对铣削力做出较准确的预测。

研制了一种基于高刚度PZT作动器的超精密定位工作台，其特点是采用弹性铰链预紧和提供工作台侧向刚度，结构简单。动态响应速度快，分辨率高，为防止PZT作动器受到过大弯力作用和动平台弯曲变形，在动平台与PZT作动器间加入弹性缓冲环节和辅助性隔离板，另外，对工作台输入输出特性、静动态刚度和模态振刚、以及受外力作用时产生的静态位移误码差进行了试验研究。试验数据表明，该工作台可作为精密磨床的辅助工作台，极大地提高机床的定位精度。PZT作动器; 精密定位工作台; 动态特性