Research On The Design And Control Of The Active Hydro-pneumatic Suspension Of An Unmanned Combat Vehicle

Different from the traditional passive suspension,hydro-pneumatic suspension has the characteristics of nonlinear stiffness and damping,which makes the parameters of the hydro-hydraulic suspension and the performance of the vehicle more effectively match under different load conditions,the performance of the suspension is further improved;And active hydro-pneumatic suspension can control the actuator reasonably through effective control strategy in the control system,thus ensuring the suspension performance in different conditions can remain relatively optimal,this is of great significance for special vehicles equipped with electronic equipment,weapons equipment,harsh environments and higher requirements on the performance of suspension systems,therefore,research on the design and control strategy of active hydro-pneumatic suspension is necessary.In this paper,hydro-pneumatic spring which the core component of hydro-pneumatic suspension is designed,than the simulation model of the hydro-pneumatic spring is established by AMESim,by comparing the experimental data with the simulation data of the hydro-pneumatic spring characteristic analysis,get conclusion that the simulation model of the hydro-pneumatic spring is reasonable.Then analysis the mathematic model and establish simulation model of two degrees of freedom 1/4 car hydro-pneumatic suspension,based on this,study the active hydro-pneumatic suspension control mode,clarify the electro-hydraulic servo control mode of active hydro-pneumatic suspension,and set up the vibration model of two degrees of freedom 1/4 car active hydraulic suspension to prepare for the establishment of active hydro-pneumatic suspension model;Then analysis the evaluation indicators of suspension performance which is vehicle ride comfort used in this paper contains body acceleration,suspension working space and dynamic tire load;Finally,study of the control strategy of active hydro-pneumatic suspension,determine hydro-pneumatic suspension control strategy used in this paper is LQG-Fuzzy-PID.Under the same road excitation input,simulation comparative analysis the performance of passive and active hydro-pneumatic suspension in time domain and frequency domain,the results show that the active hydro-pneumatic suspension can effectively improve the performance of the suspension based on the passive hydro-pneumatic suspension.