Fig 1.
Diagram of traditional hydropneumatic suspension system.
Fig 2.
Parameter to project the compensator.
(a) Maximum gain in function of damping coefficient. (b) Dimensionless factor in function of damping coefficient.
Fig 3.
Diagram: Steps to project a hydropneumatic PHC.
Fig 4.
Control diagram of SAHC.
Fig 5.
(a) Low damping value. (b) High damping value.
Fig 6.
(a) Frequency response with and without bulk modulus for 350t. (b) Normalized transmittance error without bulk modulus.
Fig 7.
Frequency response semi-active control in function of mass.
(a) Control with maximum gain of 10dB (b) Control with maximum gain of 3dB.
Table 1.
Summary of frequency response for SAHC in function of sprung mass.
Fig 8.
Compensator performance for random ocean wave.
(a) Input signal and semi-active control responses for 150tonnes mass. (b) Responses of 3dB and 10dB semi-active controls.
Fig 9.
(a) Sprung mass of 350tonnes. (b) Sprung mass of 150tonnes.
Table 2.
Summary of frequency response for balance control.
Fig 10.
(a) Sprung mass of 350tonnes. (b) Sprung mass of 150tonnes.
Table 3.
Summary of frequency response for skyhook control.
Table 4.
Control systems comparison for sprung mass of 150tonnes.
Fig 11.
Compensator performance for random ocean wave with skyhook control and balance control.
Fig 12.
(a)Schematic illustration of the prototype. (b) Experimental setup.
Table 5.
Experiment setup.
Fig 13.
Dimensionless factor vs. ζ and its confidence interval for experimental setup.
Table 6.
Theoretical parameters for pipe length of 200mm.
Table 7.
Damping coefficients for sprung mass of 8kg and 6kg.
Fig 14.
Bode diagram for 8kg sprung mass considering different dampings and their confidence intervals.
Fig 15.
Bode diagram of 8kg and 6kg sprung masses with same damping and their confidence intervals.