Research On Novel Hydraulically Interconnected Suspension To Improve Mining Vehicle Comfort Performance

To improve comfort of the mining vehicle, the traditional method is to soften the leaf spring to moderate the suspension bounce stiffness, but results in an undesired softness of the suspension pitching mode. A soft pitching mode reduces the comfort performance of the mining vehicle, especially during heavy breaking.A novel hybrid suspension system is proposed in this thesis, which combines a reduced leaf spring and a set of interconnected hydraulic cylinders to provide a comfort vertical support to the vehicle body and enhance its pitching mode. The design process and parameter optimization of the hybrid suspension system are provided in the paper. Parameter identification technology is employed to identify the suspension stiffness of the original and modified vehicle to verify the HIS performance. Field tests are carried out to compare the ride comfort and pitch angle reduction under variable maneuvers at different vehicle speed.This paper includes the following four parts:(1) Modelling analysis of hydraulic interconnected suspension system and vehicle. The modeling is based on Adams/Car. The AMESim is employed to build the hydraulic parts of the HIS system, and Simulink is used to build co-simulation model to connect the vehicle with the HIS system.(2) Verification of hydraulic circuit parameters affecting the performance of the vehicle. Chang the parameters of the hydraulic circuit in the joint simulation to analyze the influence of various parameters on the vehicle comfort to match the HIS reasonably for the mining vehicle.(3) Design of a HIS system for the mining vehicle to improve comfort. The selection of the hydraulic parts and improvement of the leaf spring of the vehicle depends on the results of parameter identification. The vertical stiffness changes little while the pitching stiffness improves obviously after modifying key parameters.(4) Vehicle road test of the installed hydraulic circuit and the new leaf spring in mining vehicle. Braking test verifies the difference of the pitching angle. Random road test verifies the difference of the acceleration RMS value before and after modified. The results of the tests indicates that the HIS system is superior performance in vehicle comfort.