Experimental Investigation and Vibration Control of Semi-active Hydraulic-Pneumatic Mounts for Vibratory Roller Cab

In this paper, a combined hydraulic-pneumatic mount (CHPM) of the cab isolation system is proposed for the improvement of the vibratory roller's ride quality. The semi-active hydraulic-pneumatic mount (SHPM) is then developed to further improve the ride quality. Based on the actual structure of vibratory rollers, a three-dimensional model of the vibratory roller and lumped parameter model of the cab isolation systems including the traditional rubber mount (TRM), CHPM, and SHPM are established to evaluate the performance of the cab isolation systems under the various vibration excitations of the deformable ground and the vibratory drum (at excitation frequencies of 28 Hz and 35 Hz). The experimental investigation of the vibratory roller cab equipped with the TRM is also performed to verify the reliability of the lumped parameter models and numerical simulation results. Two performance indices of power spectral density (PSD) and root mean square (RMS) acceleration responses of the driver's seat and cab are chosen to assess the effectiveness of cab isolation systems. Contrastive analysis of the vibration isolation characteristics of the TRM, CHPM, and SHPM is carried out, respectively. The investigation results indicate that the CHPM has an obvious effect on improving the ride quality and reducing the cab shaking compared to the TRM under various simulation conditions. Additionally, the SHPM controlled by the proportional-integral-derivative (PID)-Fuzzy control can further improve the vibratory roller ride quality in comparison with the CHPM under the same simulation conditions.