And Simulation Of Road Stiffness Recognition Theory

When tanks and armored vehicles traveling on different road,there will be many engine vibrations and body vibrations caused by rough road. These severe vibrations lead to working environments of equipments and parts from the tanks and armored vehicles deterioration and affects their normal operation, at the same time they can seriously affect the speed and firing accuracy on moving. Meanwhile, the high-end civilian cars are also actively seeking methods to solve the vibration of the vehicle. To achieve active shock absorption of armored vehicles and civilian vehicles during driving, we need to identify the stiffness of the road and though changing the parameters of vehicle system based on the pavement stiffness to achieve active control.Based on the Winkler foundation model, this paper builds the calculating model of rigid pavement and derives an analytic solution of deflection under the action of load of rigid pavement according to the elastic foundation plate theory. Based on the layered elastic theory, this paper builds the calculating model of flexible pavement and derives expression of deflection under the action of load of flexible pavement, and compiles calculation program of integral constant in expression of flexible pavement deflection with MATLAB program. Comparing the theoretical calculation of deflection about rigid pavement and flexible pavement with the ABAQUS finite element simulation results and the results of the deflection test, we can obtain following conclusions:(1)According to the analysis of examples, we can see that the rigid pavement is under the action of wheeled vehicles load and track-laying vehicle load.The results of stiffness values of theoretical calculation and those of the numerical simulation of ABAQUS, are extremely close.The deviation is between5.86%and14.3%. This shows that the theoretical calculation method of the rigid pavement has high reliability and applicability, which is deduced in this paper.(2) According to the analysis of examples, we can see that the flexible pavement is under the action of wheeled vehicles load and track-laying vehicle load. The results of stiffness values of theoretical calculation and those of the numerical simulation of ABAQUS, are extremely close.The deviation is between1.88%and15.8%. This shows that the theoretical calculation method of the flexible pavement has high reliability and applicability, which is deduced in this paper.(3) In the example1, Changzhou Wu Yi road pavement is under the action of rear axle of10t standard axle load, comparing the road’s stiffness value of the theoretical calculation with the experimental results,the error is between5.7%and15.6%, within the engineering tolerance. It has once again proven that the calculation method of flexible pavement is accurate in this paper.(4)When comparing to numerical calculation and some other methods of stiffness identification, we can learn that adopting the calculation of flexible pavement and rigid pavement which is derived in this paper can greatly improve the computational speed and can ensure the accuracy of the calculation.