Study On The Hydro-Pneumatic Suspension For Heavy Duty Mineral DUMP Truck

With the rapid development of mining and construction engineering industry,a growing number of mining vehicles and non-road vehicles are being put into use.Since such vehicles are mostly heavy vehicles,compared to conventional vehicles,they have larger load,poor road surface,and poor working environment,how to ensure the rapid mobility capability and improve vehicle ride comfort is a major issue to be considered.Selecting excellent suspension characteristics,designing suitable suspension system is an effective way to solve this problem.Traditional suspension system can meet the performance requirements when runs in low speed on planar road surface;however,when driving on poor road surface, especially larger load,the impact from the road surface is very large,cause vehicle body vibrating violently,requiring a greater suspension stiffness and dynamic travel to the attenuation of vibration energy;while the linearity of the traditional suspension has poor adaptability to poor road surfaces,the suspension characteristics can not be adjusted according to changes in external incentives,dynamic performance is restricted by excitation,load and other external factors.Hydro-pneumatic suspension integrates the spring unit and shock absorber,with its excellent nonlinear stiffness and damping characteristics,hydro-pneumatic suspension is widely used in engineering vehicles.According to the project "motor wheel mining dump truck hydraulic system checksum-Hydro-pneumatic suspension system design" funded by CSR Guangzhou electric locomotive Co., Ltd.,the paper mainly studies the hydro-pneumatic cylinder and vehicle ride comfort.Firstly,this paper uses the way of mathematical modeling-model simulation-experimental verification,conducted a multi-level study. By using orifice flow equation and the R-K equation to analyze the working principle of hydro-pneumatic suspension cylinder; By using AMESim software to build hydro-pneumatic suspension cylinder model to obtain the working characteristics;By testing to simulate the actual working performance and validate simulation model.Secondly,the paper also studied vehicle ride comfort by the way of combining model simulation and test.By using multi-body dynamics software SIMPACK to built vehicle simulation model,the simulation and analysis of vehicle ride comfort was performed according to the relevant evaluation criteria,analyzing speed,load and other factors on the impact of vehicle ride comfort;the paper tested the ride comfort,tested the vehicle’s performance in a variety of working conditions according to the relevant evaluation criteria, and evaluated the performance of the ride comfort.The results of the study can provide theoretical basis for the development of hydro-pneumatic suspension products and optimizing suspension parameters.