On the analysis of the double Hopf bifurcation in machining processes via centre manifold reduction

T. G. Molnar, Z. Dombovari, T. Insperger, G. Stépán

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8 Citations (Scopus)


The single-degree-of-freedom model of orthogonal cutting is investigated to study machine tool vibrations in the vicinity of a double Hopf bifurcation point. Centre manifold reduction and normal form calculations are performed to investigate the long-term dynamics of the cutting process. The normal form of the four-dimensional centre subsystem is derived analytically, and the possible topologies in the infinite-dimensional phase space of the system are revealed. It is shown that bistable parameter regions exist where unstable periodic and, in certain cases, unstable quasi-periodic motions coexist with the equilibrium. Taking into account the non-smoothness caused by loss of contact between the tool and the workpiece, the boundary of the bistable region is also derived analytically. The results are verified by numerical continuation. The possibility of (transient) chaotic motions in the global non-smooth dynamics is shown.

Original languageEnglish
Article number20170502
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2207
Publication statusPublished - Nov 1 2017



  • Centre manifold reduction
  • Double Hopf bifurcation
  • Machine tool vibration
  • Nonlinear dynamics

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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