Obstacle Surmounting Performance Calculation And Simulation Analysis System Secondary Development Of An 8×8 Vehicle

Off-road vehicles often encounter steps,trenches and other obstacles in the field.For heavy off-road vehicles,their ability to cross steps and trenches is generally considered to be one of the most important indicators of their trafficability.In order to improve the vehicle’s ability to pass through the unknown road,it is necessary to study its obstacle surmounting performance.In this dissertation,an 8 × 8 off-road vehicle is studied,and the obstacle surmounting performance is analyzed by modeling solution and software simulation analysis.The main contents of this dissertation are:(1)Rational simplification and assumptions of the vehicle physical model were made.The mathematical model of the vehicle cross the step and the trench with rigid tire was established by using the static equilibrium equation.The mathematical model was solved numerically by Newton’s iteration method,and the influence of adhesion coefficient,centroid position,centroid height and suspension stiffness on the performance of the vehicle cross the step and the trench was analyzed.(2)Based on the above model,taking into account the radial elastic properties of the tire and its stiffness,a mathematical model of vehicle cross step and trench considering the tire deformation was established.The mathematical model was numerically solved,and the results were compared with that of the model with rigid tire.(3)Based on ADAMS / VIEW,the secondary development of vehicle obstacle surmounting simulation analysis system was completed through custom menus,custom dialogs and macro commands.The simulation system has a good human-machine interaction,and the parameterized vehicle obstacle surmounting model can be quickly established.After the simulation,the developed post-processing module can conveniently obtain the relevant simulation result curve.(4)After the simulation conditions were set up,the simulation of vehicle cross different height steps and different width trenches was completed by using the secondary developed simulation system.And the force and acceleration characteristics of the related components such as tire and shock absorber were obtained by simulation.