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Identification of machining force model parameters from acceleration measurements

This paper presents a method, which does not require the use of a force dynamometer, for estimating the mechanistic cutting force model coefficients in milling. The cutting forces are reconstructed from acceleration signals measured during machining, and from experimentally evaluated Frequency Response Functions (FRFs). The quality of reconstruction is improved by the application of the Tikhonov regularisation technique, for which the measurement noise is estimated beforehand. Since the DC component of the FRF and of the acceleration signals is unknown when using piezoelectric accelerometers and impact hammers, the cutting force model estimation requires the knowledge of the cutting force pattern for a particular cutting scenario.