Study On Oil-gas Suspension System And Vehicle Ride Comfort Mechanism Based On Wide-body Mine Car

Today’s rapid social and economic development,the demand for mineral resources is also increasing,so wide-body harvesters are widely used in various large mining areas.Because of the large weight of wide-body harvesters,and the rugged road surface in mining areas,the bad working environment,resulting in poor ride comfort and ride comfort performance of vehicles.Compared with the traditional suspension system,the hydro-pneumatic suspension has good nonlinear characteristics,so that the mine car can better adapt to the ups and downs of the road when driving on the bad road surface,alleviate the impact of the road to the body,and attenuate the vibration.Hydro-pneumatic spring system is a main functional part of the hydraulic suspension structure,set vibration damping components and elastic components in one,and hydro-pneumatic spring has a strong guiding supporting role,because of its excellent nonlinear stiffness and tensile strength damping characteristics,it has been widely used in construction machinery vehicles.Firstly,the working mechanism of hydro-pneumatic spring is studied in depth by using the method of "mathematical modeling-model simulation-test verification".The working mechanism of hydro-pneumatic spring is deeply analyzed by hydrodynamics theory.An AMESim simulation model of hydro-pneumatic spring is established to analyze the performance of the hydro-pneumatic suspension system and reveal its working characteristics and rules.The influence of damping characteristics,stiffness characteristics and piston rod dynamic output force on the dynamic performance of hydro-pneumatic suspension system is studied.The correctness of the simulation model is verified by experiments.Secondly,taking the front half body of 90 T wide body car as the research object,establishes the mathematical model and simulation model of the 1/2 body dynamics of wide body car,and gives a new method of vehicle ride comfort analysis and evaluation.Mathematical modeling and simulation is carried out on random road vehicles,under the condition of different velocity and different pavement level,through the multidisciplinary simulation software AMESim for 1/2 vehicle suspension vibration system simulation for the process of road driving,reveals the body acceleration,tyre dynamic load and suspension actuator stroke as well as evaluation index of vehicle ride performance analysis.Then the two-stage progressive control method is used to adjust the output force of the vehicle suspension in time.Through the co-simulation of AMESim and MATLAB,the simulation verification of the active control of the suspension system under different working conditions is realized,so as to control the height of the vehicle body in time,and further improve the ride comfort of the vehicle.Finally,the dynamic performance of active and passive suspension is compared and analyzed,and the ride comfort of vehicle vertical motion and roll motion under different speeds and working conditions is studied.The analysis shows that the ride comfort of active suspension is significantly improved than that of passive suspension.The research content of this paper has laid a theoretical foundation for the product development of oil-gas suspension and the control strategy of suspension system,which has a certain practical significance.