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The cab vibration and ride comfort of off-highway vehicles were analyzed using a multi-body system dynamics model that consists of cab and four isolation mounts. The vibrational Power Spectral Density (PSD) data measured on four mounting brackets was used as excitation input to the model to represent real-world situations. As specified in the SAE and ISO recommendations, a weighted rms acceleration was used as a measure of ride comfort or human perception of vibration severity of vehicles. The analytically predicted results have shown excellent agreement to the measured data. Design optimization process or sensitivity analysis was demonstrated to investigate the effects on vehicle ride quality of isolation mount characteristics (axial and radial stiffness) and mounting configuration (mount location and orientation).

Tractor cab interior noise has been predicted by using a numerical method whereby cab structural and acoustic characteristics are described, respectively, by finite element and boundary element models. The spectral vibrational data measured below cab isolation mounts is used as mechanical excitations to cab-mount system. Responses on each grid point are calculated in structural analysis and subsequently converted to velocity boundary conditions in acoustic prediction of interior noise. The analytical results match reasonably well with the measured regarding cab vibration and the noise level at operator ear. Panel contribution analysis is also performed to examine the relative importance of concerned portions of cab structure or enclosure.