Spectral analysis and second-order cyclostationary analysis of the non-stationary stochastic motion of a boring bar on a lathe

Abstract

In turning and boring, vibration is a frequent problem. Themotion of a boring bar is frequently influenced by force modulation, i.e.the dynamic motion of the workpiece related to the residual rotor massimbalance influences the motion of the motion of the boring bar via therelative dynamic motion between the cutting tool and the workpiece.Second-order cyclostationary analysis of the non-stationary stochasticmotion of a boring on a lathe is carried out and compared with theconventional spectrum estimation method of the power spectral density.It is observed that the periodic nature of this dynamic motion suits wellin the cyclostationary framework because of the rotating motion on thelathe. Also, it is found that cyclostationary analysis contains the timeinformation in the metal cutting process and it can provide insight on themodulation structure of the frequencies involved in the boring operation.