Application of piezoelectric patches for chatter suppression in machining processes

Abstract In this paper by applying piezoelectric patches, a new method for vibration and chatter suppression in boring bar is presented. The boring bar is modeled as an Euler–Bernoulli beam, and the nonlinear governing differential equation of motion is derived by considering nonlinear geometrical effects and viscoelastic material properties. Equation of motion is discretized via Galerkin method by using mode shapes of the beam under axial load. Moreover, an explicit equation is proposed to investigate the effects of using piezoelectric patches on the lobe instability region. In addition, the effects of system parameters on the stability lobe diagrams are studied analytically, as well as vibration behavior of the boring bar. Results reveal that piezoelectric patches have significant effect on the stability regions, and reduce the vibration amplitude of the boring bar. Intensity of the effects depends on the patches length, as well as the applied voltage. It is also observed that applying voltage to the patches increases the stability region, and translates the stability region to the left side. Therefore, steady state machining without chatter, occurs at low spindle speeds. Results show obvious improvement of stability performance in comparison with other used methods.

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