Sensitivity of stability charts with respect to modal parameter uncertainties for turning operations

Stability prediction of machining operations is often not reliable due to the inaccurate mechanical modeling. A major source of this inaccuracy is the uncertainties in the dynamic parameters of the machining center at different spindle speeds. The measured frequency response functions of the tool are usually loaded by noise and identification of the operational modal behavior based on static measurements is not straightforward. In this paper, the effect of small changes of the frequency response function on the stability of turning processes is analyzed using the semi-discretization method and the single-frequency solution.