长悬臂坐标测量机动态力引起的误差分析与控制

Analysis and Control of the Error Coursed by Dynamic Force of the Long Cantilever CMM

根据长悬臂测量机具有长悬臂和弱刚度的特性,分析了测量机动态力的来源,研究了动态力对测量机测量误差的影响和测头附加动态误差的来源,得出测量机测头附加动态误差具有三维特性,各个方向附加动态误差与3个方向导轨系统振动特性有关。推导了悬臂测杆系统振动数学模型,根据该模型采取了相应的动态力控制措施,实验结果证明了所采取控制措施的有效性。

According to the long cantilever and non-rigid characteristic of long cantilever coordinate measuring machine, the detailed analysis on the dynamic forces sources of the measuring machine was studied. The influences of the dynamic forces on the measuring error of CMM, and the additive dynamic error sources of the probe were investigated respectively. The conclusions that the additive dynamic error of the CMM probe had three-dimension character and the additive dynamic error in each dimension related to the vibration characteristic of the guide strip system were obtained. The mathematics model of vibration in the group system composed by the cantilever and the measuring staff was deduced subsequently. Based on the model, the corresponding means was adopted to control the vibration. The experimental results proved that the control means is valid and suitable.