Research On Key Technology Of Hydro-pneumatic Spring Suspension System For 8×8 Wheeled Armored Vehicle

This subject originated from the industry-university-research cooperation project.It was commissioned by Shandong Wantong Hydraulic Co.,Ltd.to design the structure of the hydro-pneumatic spring for 8×8 wheeled armored vehicles and conduct in-depth research on its performance.Because the armored vehicle has been in a harsh working environment for a long time,ordinary springs and single-chamber hydro-pneumatic spring It is difficult for the spring to absorb the vibration and impact generated by the road and weapon shooting.Therefore,this paper designs a new type of dual-chamber hydro-pneumatic spring structure to improve the performance of wheeled armored vehicles.The main research contents are as follows:First of all,in order to improve the non-linear characteristics of the hydro-pneumatic spring,one of the air chambers was set on the basis of the dual-chamber hydro-pneumatic spring,and a new type of dual-chamber hydro-pneumatic spring structure is designed,and the structural dimensions of each part is rationalized according to its working principle.select.Through the simplified model of the new dual-chamber hydro-pneumatic spring,the differential equation of motion of the system is established and numerically solved,and the correctness of the theoretical analysis is verified by dynamic simulation using ADAMS.Secondly,the D’Alembert principle is further used to establish theoretical equations for the damping and stiffness nonlinear characteristics of the new dual-chamber hydro-pneumatic spring.Under the MATLAB/Simulink module,the sinusoidal excitation signal is input,and the structure size,working conditions and the outside world are investigated through the controlled variable method.The influence trends of the three types of excitation parameters on the nonlinear characteristics of the new dual-chamber hydro-pneumatic spring are verified by experiments through a simple test bench built.Third,the road time domain model is created by MATLAB to simulate the excitation generated by the real random road surface when the armored vehicle is driving,and the 1/8 vehicle vibration model is established under this road surface model,and the single-chamber hydro-pneumatic spring suspension and the new dual-chamber hydro-pneumatic spring suspension are compared and analyzed.The effect of the suspension on the ride comfort of the vehicle,the results show that the new dual-chamber hydro-pneumatic spring spring has a significant improvement in four evaluation indexes than the single-chamber hydro-pneumatic spring,which can better alleviate the vibration of the road to the vehicle body;and the D-G road surface level,Carry out research on the ride comfort of vehicles with speeds of30Km/h-50Km/h;subsequently,a 1/4 vehicle vibration model was established,and the vibration characteristics of 1/8 and 1/4 vehicles were compared,and the vibration simulation results were basically the same.Finally,the new dual-chamber hydro-pneumatic spring is installed on the Mac Pherson suspension,and the suspension system is analyzed by kinematics simulation using the ADAMS Car and ADAMS Insight modules.The test variables are selected from 8 relevant hard point coordinates,and the design objective function is as follows: Four,including wheel camber angle,toe angle,kingpin inclination angle and kingpin caster angle.256 simulation tests are carried out.After optimization,its positioning parameters are all within a reasonable range,which verifies that the handling and stability of wheeled armored vehicles with a new type of dual-chamber hydro-pneumatic spring structure has been further improved.