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Abstract
This thesis contains theoretical and experimental studies of the
hyDROPneumatic vehicle suspensions. Depending on the well-known quarter
car model, first techniques for modeling the vehicle and road surface are
discussed. The standard linear and nonlinear analysis methods are reviewed.
The performances of the proposed suspension systems are compared with
both the baseline passive system and an idealized fully active suspension
one.
Secondly, the analysis and the descriptions of a hyDROPneumatic suspension
system is studied based on the existing hyDROPneumatic passive suspension
system of CITROEN-BX type. Predicted results for this existing
hyDROPneumatic passive suspension system are generated in terms of the
I.S.0. weighted body acceleration; dynamic tyre load, and suspension
working space.
Thirdly, the control laws for active suspension systems using the full and
limited state feedback gains are generated. The controller design for the
proposed suspension is based on limited state feedback, and the Nelder
Mead simplex algorithm is used to calculate the gains to optimise the
performance index. The effects of the control law time delay, and the payload
variations on the active suspension system performance are discussed.
Fourth, two versions of slow active (limited bandwidth) hyDROPneumatic
suspension. systems are studied and developed. By using existing
hyDROPneumatic suspension system components, that taken off Citroen-BX
type, it is capable to form a practical slow active hyDROPneumatic suspension
system. By inserting a PlO controller into the error correction signal with the
suspension working space feedback signal, a self leveling effect can be
obtained,
Fifth, the characteristics of the practical hyDROPneumatic passive suspension
system (i.e. gas spring stiffness and throttling valve-damping coefficients) are
measured, and the quarter car (single wheel station) test rig is designed to
evaluate the performance of the hyDROPneumatic passive suspension system
which taken off CITROEN-BX type. A controller is designed to drive the
practical slow active hyDROPneumatic suspension system using Labview
software with the pc mIc, and the data acquisition card. Finally, the theoretical
and the experimental results of the slow active hyDROPneumatic suspension
system are reasonable and encourage continuing the work in this field with
the limited state feedback gains.