15 Nonlinear Gear Transmission System Numerical Dynamic Analysis and Experimental Validation 165 Fig. 15.4 (a) Effective value of the gear meshing stiffness. (b) Backlash modeling of the gear teeth Fig. 15.5 Lumped mass of the gear-pair system, coupled with a finite element model of the flexible shafts and the gearbox 15.5 Results In this section presented results of the experimental data that generated from the gearbox device, with the corresponding numerical results of the gearbox model. First Fig. 15.6 shows the power spectral density of the acceleration time history of measurement point 2, in the vertical (Z) direction, in a frequency range of 0–2000 Hz, for input rotation speed at 290 RPM. Also in this figure presented with the dashed line the gear mesh frequency (GMF) with sub-harmonics and super-harmonics. Similar results presented and in the Fig. 15.6 for the rotation speed at 790 RPM.
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