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.

Keywords

• boring bar,cyclostationary,lathe,power spectral density,second-order statistics

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