Coherence 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Frequency [Hz] 0 2 4 6 Magnitude [N/N] 0 0 0.5 1 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Frequency [Hz] H yy H yx H yy H yx Fig. 1.2 Measured FRFs of the force dynamometer from impulse excitation. The dynamometer is excited in the y-direction and responses collected in y- and x-directions 0 500 1000 1500 2000 2500 3000 −600 −400 −200 0 Phase [Deg] Frequency [Hz] 0 500 1000 1500 2000 2500 3000 0 2 4 6 8 10 Frequency [Hz] Magnitude [N/N] Measured FRF, H xx Estimated (ETFE), H xx(min) Combined FRF Measured FRF, H xx Estimated (ETFE), H xx(min) Combined FRF Combined FRF without linear phase Fig. 1.3 Magnitude and phase responses of Hxx(ω), Hxx(min)(ω) and the combined FRF, nb ¼200 and na ¼55: The dynamometer’s dominant modes are: 1110 Hz, 1725 Hz, 2700 Hz 1 Improved Cutting Force Measurements in Milling Using Inverse Filtering 5
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