Abstract
Previous work on machine-tool dynamics has identified three mechanisms that lead to the dynamic instability known as chatter, namely the regenerative effect, velocity-dependent friction or stick-slip, and modecoupling. It has long been recognized that the underlying physics of these mechanisms is nonlinear, yet traditional treatments of the problem focus on linearized reduced-order approaches.
In this paper, we report our efforts to examine and control the complex dynamic response of a boring tool. We have designed and fabricated a boring bar system with sensors and actuators to aid our investigations. Experiments with this so-called “smart” tool reveal evidence of a subcritical transition from stable to unstable cutting. We examine a nonlinear machinetool dynamics model from the literature that possesses a similar instability. Local analysis of this system suggests that the bifurcation is supercritical. However, the created small-amplitude limit cycle quickly loses stability via a cyclic-fold bifurcation. We find theoretically and experimentally that such a behavior can be controlled by enhancing the structural damping.
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© 1999 Springer Science+Business Media Dordrecht
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Nayfeh, A.H., Pratt, J.R. (1999). Chatter Identification and Control for a Boring Process. In: Moon, F.C. (eds) IUTAM Symposium on New Applications of Nonlinear and Chaotic Dynamics in Mechanics. Solid Mechanics and its Applications, vol 63. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5320-1_21
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DOI: https://doi.org/10.1007/978-94-011-5320-1_21
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