68 S. Manzoni et al. Fig. 7.17 Acouple of accelerators used for response accelerometers 0 10 20 30 40 50 60 70 80 90 100 110 10-2 100 102 Frequency[Hz] Amplitude [m/s2/N] FRF Hyy 0 10 20 30 40 50 60 70 80 90 100 110 -200 -100 0 100 200 Frequency [Hz] Phase [°] Fig. 7.18 Experimental measured FRF 7.4 Results Diagram shown in Fig. 7.19 shows the results achieved by means to the technique earlier described, in terms of comparison between measured data and evaluated axial load, including a couple of band of relative error. The results shown were obtained applying the various steps of the method suggested. Initially, the natural frequencies of the tie-rod were experimentally identified. Then the investigation of CoMAC index in the measuring point led to evaluate the constraints stiffness. Finally, minimization process was applied, yielding results close to the measured axial load values.
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