Chatter is one of the most important limitations on the productivity of milling process. In order to avoid the poor surface quality and potential machine damage due to chatter, the material removal rate is usually reduced. The analysis and modeling of chatter is complicated due to the time varying dynamics of milling chatter which can be avoided without sacrificing the productivity by using ana...

Abstract In this research, a generalized tool life modelling for considering non-stationary cutting conditions was developed . particular, the first time in literature, model conceived predicting of when spindle speed variation SSV , one most effective techniques suppressing regenerative chatter vibrations, is used. The proposed formulation takes into account main parameters and associated to A...

In this paper the nonlinear dynamics of a state-dependent delay model of the turning process is analyzed. The size of the regenerative delay is determined not only by the rotation of the workpiece, but also by the vibrations of the tool. A numerical continuation technique is developed that can be used to follow the periodic orbits of a system with implicitly defined state-dependent delays. The ...

First part of the thesis deals with the dynamics and stability of nonlinear delay gyroscopic systems with periodically varying delay. The aim is to demonstrate that greater depths of cut may be achieved in a boring process (2 DOF) when the speed of the spindle is modulated sinusoidally instead of being kept constant. Since the variation of spindle speed is small and independent of the tool moti...

exit states Abstract State Both techniques eliminate distinctions within unconstrained regions of the solution space by abstracting these regions into a single state within the search tree. (The gure above is a generalized representation of the search space explored during simulation.) By identifying the boundaries of the unconstrained region, both algorithms are able to generate an abstract st...