PDF(1929 KB)
Parameters identification method for machine tool support joints
Hui ZHANG,Changliang YU,Renche WANG,Peiqing YE,Wenyong LIANG
Journal of Tsinghua University(Science and Technology) ›› 2014, Vol. 54 ›› Issue (6) : 815-821.
PDF(1929 KB)
PDF(1929 KB)
Parameters identification method for machine tool support joints
The dynamic behavior of the support directly affects the dynamic behavior of a machine tool. Thus, the support joint parameters are needed for accurate dynamic models of machine tools. This paper presents a method to identify the equivalent stiffness and damping of support joints. A 3-D stiffness-damping model is used to replace the support joint of the machine tool bed in the dynamic model. The support joint parameters are identified by modal testing which shows the natural frequencies and the damping ratios of several vibration mode shapes of the machine tool bed. However, the method is unable to identify the joint parameters for all support states. To solve this problem, this model first identifies the joint parameters for a bed with a uniform mass in the symmetrical support state, and then repeats the modal testing as the normal force on the support joint is changed to relate the joint parameters to the normal force to identify the joint parameters for any support state. The results show that the stiffness and damping both increase with increasing normal force on the support joint. Finite element method (FEM) simulations are used to verify the parameters identification results with the FEM model for the support joint parameters consistent with the experimental results.
machine tool / modal testing / support joint / parameters identification / dynamic modeling
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