| Hydro-pneumatic suspension has not only the characteristics of traditional passive suspension,but also the performance of semi-active suspension,hence the use of hydro-pneumatic suspension could improve the vehicle's handling stability and riding comfort.It is one of the key technologies for the development of engineering vehicles.In this paper,starting from the vehicle level,the comprehensive characteristics of the hydro-pneumatic suspension system were studied:(1)For the first time,the installation angle of hydro-pneumatic suspension cylinders was considered as an influencing factor of the stiffness characteristic of the suspension,the theoretical stiffness calculation formula of the interconnected hydro-pneumatic suspension system was deduced and its model was established by MATLAB software.Calculating result shown that,with the increasing of the installation angle of hydro-pneumatic suspension cylinders,the roll stiffness of the interconnected hydro-pneumatic suspension is decreased but its vertical stiffness is increased and its non-linear characteristics become weaker.(2)The ADAMS and AMESim software were used to establish the co-simulation model,and an experimental test platform was built.The experimental tests of roll stiffness,vertical stiffness and damping characteristics were carried out for the interconnected hydro-pneumatic suspension system.The comparison between the simulation and experiment results indicated that above parameters were in very good agreement.It was verified the correctness and accuracy of the corresponding co-simulation model.(3)The indicator diagram and the speed characteristic diagram were chose as the measuring method of the damping characteristics of the vehicle's hydro-pneumatic suspension system.The theoretical stiffness and damping force or damping torque calculation formula of the vehicle's hydro-pneumatic suspension system were deduced.The influence of structural parameters on the stiffness and damping characteristics of the vehicle was studied under the roll and vertical movement modes.For the first time,the influence of the installation angle of hydro-pneumatic suspension cylinders on the stiffness and damping characteristics of the vehicle was studied.Simulation result shown that,with the increasing of the installation angle of hydro-pneumatic suspension cylinders,the roll stiffness and roll damping torque of the vehicle's hydro-pneumatic suspension are reduced but the vertical stiffness is increased,and the vertical damping force is reduced.(4)In the condition of the step input and the sine input of the steering wheel,the influence of the stiffness and damping characteristics of the vehicle on the handling performance and stability of the vehicle were analyzed.Under the condition of pulse input driving,the influence of the stiffness and damping characteristics of the vehicle on the ride comfort of the vehicle were analyzed. |
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