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• W2748761736 abstract "This paper investigates the effects of bistability in a nonsmooth time-delayed dynamical system, which is often manifested in science and engineering. Previous studies on cutting dynamics have demonstrated persistent coexistence of chatter and chatter-free responses in a bistable region located in the linearly stable zone. As there is no widely accepted definition of basins of attraction for time-delayed systems, bistable regions are coined as unsafe zones (UZs). Hence, we have attempted to define the basins of attraction and stability basins for a typical delayed system to get insight into the bistability in systems with time delays. Special attention was paid to the influences of delayed initial conditions, starting points, and states at time zero on the long-term dynamics of time-delayed systems. By using this concept, it has been confirmed that the chatter is prone to occur when the waviness frequency in the workpiece surface coincides with the effective natural frequency of the cutting process. Further investigations unveil a thin ``boundary layer'' inside the UZ in the immediate vicinity of the stability boundary, in which we observe an extremely fast growth of the chatter basin stability. The results reveal that the system is more stable when the initial cutting depth is smaller. The physics of the tool deflection at the instant of the tool-workpiece engagement is used to evaluate the cutting safety, and the safe level could be zero when the geometry of tool engagement is unfavorable. Finally, the basins of attraction are used to quench the chatter by a single strike, where the resultant ``islands'' offer an opportunity to suppress the chatter even when the cutting is very close to the stability boundary." @default.
• W2748761736 created "2017-08-31" @default.
• W2748761736 creator A5024727666 @default.
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• W2748761736 date "2017-09-06" @default.
• W2748761736 modified "2023-10-17" @default.
• W2748761736 title "Basins of attraction of the bistable region of time-delayed cutting dynamics" @default.
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• W2748761736 doi "https://doi.org/10.1103/physreve.96.032205" @default.
• W2748761736 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29347033" @default.
• W2748761736 hasPublicationYear "2017" @default.
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