Research On Numerical Simulation Of Interaction Mechanism Between The Excavator Crawler System And The Ground

The motion performance of the crawler moving mechanism and the mechanicalproperties of the track shoe have a great relationship with the parameters of thesoil.Analysis of the interaction between the caterpillar moving mechanism and the soilis really of great significance for mechanism design and optimization of thecaterpillar.In this paper, numerical simulation analysis of caterpillar-soil model withthe multiple loading condition is analysed through in-depth study of the basic theoryof mechanics on the ground and the Hertz contact theory,combined multi-bodydynamics analysis with finite element analysis.The main work of this paper are summarized as follows:1) Depending on the basic theory of ground mechanics, the ground pressure andthe driving resistance of the caterpillar moving mechanism which is to study in thispaper are analysed and calculated.The theoretical earth pressue formula and thedriving resistance are obtained.This provides a theoretical basis for the next step onthe simulation analysis of the caterpillar-soil model.2) According to the basic theory of the caterpillar moving mechanism of theexcavator, external resistance of the caterpillar in two traveling conditions isobtained,which is calculated with known the main parameters of the caterpillarmoving mechanism of the excavator and the soil.3) Based on the multi-body dynamics theory and previous theoretical calculationof the caterpillar moving mechanism of the excavator, virtual prototype model of theexcavator is established using ADAMS software and dynamics simulation of the twoconditions is analysed.Force curve of the is obtained,which come fromground,supporting wheels,as well as adjacent track shoe in motion process,through theanalysis of the simulation results. Based on a series of studies on the curve,the law of the force of the caterpillar moving mechanism as a whole and individual track shoe isgot,which provides a basis for the next step on the finite element analysis of the trackshoe-soil model.4) Established finite element model of the track shoe-ground in ANSYS softwareon the basis of the Hertz contact theory and finite element theory. During themodeling process, need to select the appropriate element type, determine the materialparameters of the track shoe and soil, create the contact relationship between the trackshoe and soil, apply constraints and external loads in the right position and select theappropriate solver, etc.5)Select a period of time while the caterpillar moving mechanism is steadytraveling.In which, transient analysis of the track shoe-soil model is made in bothconditions in ANSYS software. The analysis lead to the law of the stress distributionof the track shoe, the strain distribution of the soil, the force of the caterpillar movingmechanism as a whole and the strain of the soil under the caterpillar as a whole in thetime, which proved the previous theoretical results. Then the interaction relasionshipbetween caterpillar and soil is obtained by comparing stress response curve of thetrack shoe with strain response curve of the soil.