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. The motion of a boring bar is frequently influenced by force modulation, i.e. the dynamic motion of the workpiece related to the residual rotor mass imbalance influences the motion of the motion of the boring bar via the relative dynamic motion between the cutting tool and the workpiece. Second-order cyclostationary analysis of the non-stationary stochastic motion of a boring on a lathe is carried out and compared with the conventional spectrum estimation method of the power spectral density. It is observed that the periodic nature of this dynamic motion suits well in the cyclostationary framework because of the rotating motion on the lathe. Also, it is found that cyclostationary analysis contains the time information in the metal cutting process and it can provide insight on the modulation structure of the frequencies involved in the boring operation.